These data comes from an interactive version of the scales from the International Personality Item Pool designed to
measure Cattell's 16 personality factors.

<h2>Scaling</h2>

<p>All personality items were rated on the following five point scale.</p>
<ol>
  <li>"strongly disagree"</li>
  <li>"disagree"</li>
  <li>"neither agree not disagree"</li>
  <li>"agree"</li>
  <li>"strongly agree"</li>
</ol>
<p>These items are all represented as integer values on the dataset. All missing values have been imputed via a single 
round of predictive mean matching.</p>

<h2>Warmth</h2>

<table border="1px">
  <tr>
    <th>Field</th>
    <th>Description</th>
  </tr>
  <tr>
    <td>A1</td>
    <td>"I know how to comfort others"</td>
  </tr>
  <tr>
    <td>A2</td>
    <td>"I enjoy bringing people together"</td>
  </tr>
  <tr>
    <td>A3</td>
    <td>"I feel others' emotions"</td>
  </tr>
  <tr>
    <td>A4</td>
    <td>"I take an interest in other people's lives"</td>
  </tr>
  <tr>
    <td>A5</td>
    <td>"I cheer people up"</td>
  </tr>
  <tr>
    <td>A6</td>
    <td>"I make people feel at ease"</td>
  </tr>
  <tr>
    <td>A7</td>
    <td>"I take time out for others"</td>
  </tr>
  <tr>
    <td>A8</td>
    <td>"I don't like to get involved in other people's problems"</td>
  </tr>
  <tr>
    <td>A9</td>
    <td>"I am not really interested in others"</td>
  </tr>
  <tr>
    <td>A10</td>
    <td>"I try not to think about the needy"</td>
  </tr>
</table>

<h2>Reasoning</h2>

<table border="1px">
  <tr>
    <th>Field</th>
    <th>Description</th>
  <tr>
    <td>B1</td>
    <td>"I make insightful remarks"</td>
  </tr>
  <tr>
    <td>B2</td>
    <td>"I know the answers to many questions"</td>
  </tr>
  <tr>
    <td>B3</td>
    <td>"I tend to analyze things"</td>
  </tr>
  <tr>
    <td>B4</td>
    <td>"I use my brain"</td>
  </tr>
  <tr>
    <td>B5</td>
    <td>"I learn quickly"</td>
  </tr>
  <tr>
    <td>B6</td>
    <td>"I counter others' arguments"</td>
  </tr>
  <tr>
    <td>B7</td>
    <td>"I reflect on things before acting"</td>
  </tr>
  <tr>
    <td>B8</td>
    <td>"I weigh the pros against the cons"</td>
  </tr>
  <tr>
    <td>B9</td>
    <td>"I consider myself an average person"</td>
  </tr>
  <tr>
    <td>B10</td>
    <td>"I get confused easily"</td>
  </tr>
  <tr>
    <td>B11</td>
    <td>"I know that I am not a special person"</td>
  </tr>
  <tr>
    <td>B12</td>
    <td>"I have a poor vocabulary"</td>
  </tr>
  <tr>
    <td>B13</td>
    <td>"I skip difficult words while reading"</td>
  </tr>
  <tr>
</table>

<h2>Emotional Stability</h2>

<table border="1px">
  <tr>
    <th>Field</th>
    <th>Description</th>
  <tr>
    <td>C1</td>

    <td>"I seldom feel blue"</td>
  </tr>
  <tr>
    <td>C2</td>
    <td>"I feel comfortable with myself"</td>
  </tr>
  <tr>
    <td>C3</td>
    <td>"I readily overcome setbacks"</td>
  </tr>
  <tr>
    <td>C4</td>
    <td>"I am relaxed most of the time"</td>
  </tr>
  <tr>
    <td>C5</td>
    <td>"I am not easily frustrated"</td>
  </tr>
  <tr>
    <td>C6</td>
    <td>"I have frequent mood swings"</td>
  </tr>
  <tr>
    <td>C7</td>
    <td>"I often feel blue"</td>
  </tr>
  <tr>
    <td>C8</td>
    <td>"I dislike myself"</td>
  </tr>
  <tr>
    <td>C9</td>
    <td>"I feel desperate"</td>
  </tr>
  <tr>
    <td>C10</td>
    <td>"I am easily discouraged"</td>
  </tr>
</table>

<h2>Dominance</h2>

<table border="1px">
  <tr>
    <th>Field</th>
    <th>Description</th>
  <tr>
    <td>D1</td>
    <td>"I take charge"</td>
  </tr>
  <tr>
    <td>D2</td>
    <td>"I want to be in charge"</td>
  </tr>
  <tr>
    <td>D3</td>
    <td>"I say what I think"</td>
  </tr>
  <tr>
    <td>D4</td>
    <td>"I am not afraid of providing criticism"</td>
  </tr>
  <tr>
    <td>D5</td>
    <td>"I take control of things"</td>
  </tr>
  <tr>
    <td>D6</td>
    <td>"I can take strong measures"</td>
  </tr>
  <tr>
    <td>D7</td>
    <td>"I wait for others to lead the way"</td>
  </tr>
  <tr>
    <td>D8</td>
    <td>"I never challenge things"</td>
  </tr>
  <tr>
    <td>D9</td>
    <td>"I let others make the decisions"</td>
  </tr>
  <tr>
    <td>D10</td>
    <td>"I let myself be pushed around"</td>
  </tr>
</table>

<h2>Liveliness</h2>

<table border="1px">
  <tr>
    <th>Field</th>
    <th>Description</th>
  <tr>
    <td>E1</td>
    <td>"I am the life of the party"</td>
  </tr>
  <tr>
    <td>E2</td>
    <td>"I love large parties"</td>
  </tr>
  <tr>
    <td>E3</td>
    <td>"I joke around a lot"</td>
  </tr>
  <tr>
    <td>E4</td>
    <td>"I enjoy being part of a loud crowd"</td>
  </tr>
  <tr>
    <td>E5</td>
    <td>"I amuse my friends"</td>
  </tr>
  <tr>
    <td>E6</td>
    <td>"I act wild and crazy"</td>
  </tr>
  <tr>
    <td>E7</td>
    <td>"I seldom joke around"</td>
  </tr>
  <tr>
    <td>E8</td>
    <td>"I don't like crowded events"</td>
  </tr>
  <tr>
    <td>E9</td>
    <td>"I am the last to laugh at a joke"</td>
  </tr>
  <tr>
    <td>E10</td>
    <td>"I dislike loud music"</td>
  </tr>
</table>

<h2>Rule Consciousness</h2>

<table border="1px">
  <tr>
    <th>Field</th>
    <th>Description</th>
  <tr>
    <td>F1</td>
    <td>"I believe laws should be strictly enforced"</td>
  </tr>
  <tr>
    <td>F2</td>
    <td>"I try to follow the rules"</td>
  </tr>
  <tr>
    <td>F3</td>
    <td>"I believe in one true religion"</td>
  </tr>
  <tr>
    <td>F4</td>
    <td>"I respect authority"</td>
  </tr>
  <tr>
    <td>F5</td>
    <td>"I like to stand during the national anthem"</td>
  </tr>
  <tr>
    <td>F6</td>
    <td>"I resist authority"</td>
  </tr>
  <tr>
    <td>F7</td>
    <td>"I break rules"</td>
  </tr>
  <tr>
    <td>F8</td>
    <td>"I use swear words"</td>
  </tr>
  <tr>
    <td>F9</td>
    <td>"I oppose authority"</td>
  </tr>
  <tr>
    <td>F10</td>
    <td>"I know how to get around the rules"</td>
  </tr>
</table>

<h2>Social Boldness</h2>

<table border="1px">
  <tr>
    <th>Field</th>
    <th>Description</th>
  <tr>
    <td>G1</td>
    <td>"I feel comfortable around people"</td>
  </tr>
  <tr>
    <td>G2</td>
    <td>"I talk to a lot of different people at parties"</td>
  </tr>
  <tr>
    <td>G3</td>
    <td>"I don't mind being the center of attention"</td>
  </tr>
  <tr>
    <td>G4</td>
    <td>"I make friends easily"</td>
  </tr>
  <tr>
    <td>G5</td>
    <td>"I start conversations"</td>
  </tr>
  <tr>
    <td>G6</td>
    <td>"I find it difficult to approach others"</td>
  </tr>
  <tr>
    <td>G7</td>
    <td>"I often feel uncomfortable around others"</td>
  </tr>
  <tr>
    <td>G8</td>
    <td>"I have little to say"</td>
  </tr>
  <tr>
    <td>G9</td>
    <td>"I am quiet around strangers"</td>
  </tr>
  <tr>
    <td>G10</td>
    <td>"I keep in the background"</td>
  </tr>
</table>

<h2>Sensitivity</h2>

<table border="1px">
  <tr>
    <th>Field</th>
    <th>Description</th>
  <tr>
    <td>H1</td>
    <td>"I like to read"</td>
  </tr>
  <tr>
    <td>H2</td>
    <td>"I enjoy discussing movies and books with others"</td>
  </tr>
  <tr>
    <td>H3</td>
    <td>"I read a lot"</td>
  </tr>
  <tr>
    <td>H4</td>
    <td>"I don't like action movies"</td>
  </tr>
  <tr>
    <td>H5</td>
    <td>"I cry during movies"</td>
  </tr>
  <tr>
    <td>H6</td>
    <td>"I love flowers"</td>
  </tr>
  <tr>
    <td>H7</td>
    <td>"I do not enjoy watching dance performances"</td>
  </tr>
  <tr>
    <td>H8</td>
    <td>"I do not like poetry"</td>
  </tr>
  <tr>
    <td>H9</td>
    <td>"I dislike works of fiction"</td>
  </tr>
  <tr>
    <td>H10</td>
    <td>"I rarely notice my emotional reactions"</td>
  </tr>
</table>

<h2>Vigilance</h2>

<table border="1px">
  <tr>
    <th>Field</th>
    <th>Description</th>
  <tr>
    <td>I1</td>
    <td>"I find it hard to forgive others"</td>
  </tr>
  <tr>
    <td>I2</td>
    <td>"I suspect hidden motives in others"</td>
  </tr>
  <tr>
    <td>I3</td>
    <td>"I am wary of others"</td>
  </tr>
  <tr>
    <td>I4</td>
    <td>"I distrust people"</td>
  </tr>
  <tr>
    <td>I5</td>
    <td>"I believe that people seldom tell you the whole truth"</td>
  </tr>
  <tr>
    <td>I6</td>
    <td>"I believe that people are essentially evil"</td>
  </tr>
  <tr>
    <td>I7</td>
    <td>"I trust what people say"</td>
  </tr>
  <tr>
    <td>I8</td>
    <td>"I trust others"</td>
  </tr>
  <tr>
    <td>I9</td>
    <td>"I believe that others have good intentions"</td>
  </tr>
  <tr>
    <td>I10</td>
    <td>"I believe that people are basically moral"</td>
  </tr>
</table>

<h2>Abstractness</h2>

<table border="1px">
  <tr>
    <th>Field</th>
    <th>Description</th>
  <tr>
    <td>J1</td>
    <td>"I do things that others find strange"</td>
  </tr>
  <tr>
    <td>J2</td>
    <td>"I like to get lost in thought"</td>
  </tr>
  <tr>
    <td>J3</td>
    <td>"I enjoy wild flights of fantasy"</td>
  </tr>
  <tr>
    <td>J4</td>
    <td>"I love to daydream"</td>
  </tr>
  <tr>
    <td>J5</td>
    <td>"I swim against the current"</td>
  </tr>
  <tr>
    <td>J6</td>
    <td>"I take deviant positions"</td>
  </tr>
  <tr>
    <td>J7</td>
    <td>"I do unexpected things"</td>
  </tr>
  <tr>
    <td>J8</td>
    <td>"I do things by the book"</td>
  </tr>
  <tr>
    <td>J9</td>
    <td>"I seldom daydream"</td>
  </tr>
  <tr>
    <td>J10</td>
    <td>"I seldom get lost in thought"</td>
  </tr>
</table>

<h2>Privateness</h2>

<table border="1px">
  <tr>
    <th>Field</th>
    <th>Description</th>
  <tr>
    <td>K1</td>
    <td>"I reveal little about myself"</td>
  </tr>
  <tr>
    <td>K2</td>
    <td>"I am hard to get to know"</td>
  </tr>
  <tr>
    <td>K3</td>
    <td>"I don't talk a lot"</td>
  </tr>
  <tr>
    <td>K4</td>
    <td>"I bottle up my feelings"</td>
  </tr>
  <tr>
    <td>K5</td>
    <td>"I keep my thoughts to myself"</td>
  </tr>
  <tr>
    <td>K6</td>
    <td>"I am open about myself to others"</td>
  </tr>
  <tr>
    <td>K7</td>
    <td>"I am open about my feelings"</td>
  </tr>
  <tr>
    <td>K8</td>
    <td>"I disclose my intimate thoughts"</td>
  </tr>
  <tr>
    <td>K9</td>
    <td>"I show my feelings"</td>
  </tr>
  <tr>
    <td>K10</td>
    <td>"I am willing to talk about myself"</td>
  </tr>
</table>

<h2>Apprehension</h2>

<table border="1px">
  <tr>
    <th>Field</th>
    <th>Description</th>
  <tr>
    <td>L1</td>
    <td>"I am afraid that I will do the wrong thing"</td>
  </tr>
  <tr>
    <td>L2</td>
    <td>"I feel threatened easily"</td>
  </tr>
  <tr>
    <td>L3</td>
    <td>"I am easily hurt"</td>
  </tr>
  <tr>
    <td>L4</td>
    <td>"I worry about things"</td>
  </tr>
  <tr>
    <td>L5</td>
    <td>"I spend time thinking about past mistakes"</td>
  </tr>
  <tr>
    <td>L6</td>
    <td>"I feel guilty when I say 'no'"</td>
  </tr>
  <tr>
    <td>L7</td>
    <td>"I feel crushed by setbacks"</td>
  </tr>
  <tr>
    <td>L8</td>
    <td>"I don't worry about things that have already happened"</td>
  </tr>
  <tr>
    <td>L9</td>
    <td>"I am not easily bothered by things"</td>
  </tr>
  <tr>
    <td>L10</td>
    <td>"I don't let others discourage me"</td>
  </tr>
</table>

<h2>Openness to Change</h2>

<table border="1px">
  <tr>
    <th>Field</th>
    <th>Description</th>
  <tr>
    <td>M1</td>
    <td>"I believe in the importance of art"</td>
  </tr>
  <tr>
    <td>M2</td>
    <td>"I love to think up new ways of doing things"</td>
  </tr>
  <tr>
    <td>M3</td>
    <td>"I enjoy hearing new ideas"</td>
  </tr>
  <tr>
    <td>M4</td>
    <td>"I carry the conversation to a higher level"</td>
  </tr>
  <tr>
    <td>M5</td>
    <td>"I prefer variety to routine"</td>
  </tr>
  <tr>
    <td>M6</td>
    <td>"I avoid philosophical discussions"</td>
  </tr>
  <tr>
    <td>M7</td>
    <td>"I rarely look for a deeper meaning in things"</td>
  </tr>
  <tr>
    <td>M8</td>
    <td>"I am not interested in theoretical discussions"</td>
  </tr>
  <tr>
    <td>M9</td>
    <td>"I am not interested in abstract ideas"</td>
  </tr>
  <tr>
    <td>M10</td>
    <td>"I try to avoid complex people"</td>
  </tr>
</table>

<h2>Self-Reliance</h2>

<table border="1px">
  <tr>
    <th>Field</th>
    <th>Description</th>
  <tr>
    <td>N1</td>
    <td>"I want to be left alone"</td>
  </tr>
  <tr>
    <td>N2</td>
    <td>"I prefer to do things by myself"</td>
  </tr>
  <tr>
    <td>N3</td>
    <td>"I enjoy spending time by myself"</td>
  </tr>
  <tr>
    <td>N4</td>
    <td>"I seek quiet"</td>
  </tr>
  <tr>
    <td>N5</td>
    <td>"I don't mind eating alone"</td>
  </tr>
  <tr>
    <td>N6</td>
    <td>"I enjoy silence"</td>
  </tr>
  <tr>
    <td>N7</td>
    <td>"I enjoy my privacy"</td>
  </tr>
  <tr>
    <td>N8</td>
    <td>"I enjoy being part of a group"</td>
  </tr>
  <tr>
    <td>N9</td>
    <td>"I enjoy teamwork"</td>
  </tr>
  <tr>
    <td>N10</td>
    <td>"I can't do without the company of others"</td>
  </tr>
</table>

<h2>Perfectionism</h2>

<table border="1px">
  <tr>
    <th>Field</th>
    <th>Description</th>
  <tr>
    <td>O1</td>
    <td>"I want everything to be 'just right'"</td>
  </tr>
  <tr>
    <td>O2</td>
    <td>"I get chores done right away"</td>
  </tr>
  <tr>
    <td>O3</td>
    <td>"I like order"</td>
  </tr>
  <tr>
    <td>O4</td>
    <td>"I continue until everything is perfect"</td>
  </tr>
  <tr>
    <td>O5</td>
    <td>"I am exacting in my work"</td>
  </tr>
  <tr>
    <td>O6</td>
    <td>"I am not bothered by messy people"</td>
  </tr>
  <tr>
    <td>O7</td>
    <td>"I am not bothered by disorder"</td>
  </tr>
  <tr>
    <td>O8</td>
    <td>"I leave a mess in my room"</td>
  </tr>
  <tr>
    <td>O9</td>
    <td>"I leave my belongings around"</td>
  </tr>
  <tr>
    <td>O10</td>
    <td>"I put off unpleasant tasks"</td>
  </tr>
</table>

<h2>Tension</h2>

<table border="1px">
  <tr>
    <th>Field</th>
    <th>Description</th>
  <tr>
    <td>P1</td>
    <td>"I get irritated easily"</td>
  </tr>
  <tr>
    <td>P2</td>
    <td>"I get angry easily"</td>
  </tr>
  <tr>
    <td>P3</td>
    <td>"I am quick to judge others"</td>
  </tr>
  <tr>
    <td>P4</td>
    <td>"I am annoyed by others' mistakes"</td>
  </tr>
  <tr>
    <td>P5</td>
    <td>"I am easily put out"</td>
  </tr>
  <tr>
    <td>P6</td>
    <td>"I can't stand being contradicted"</td>
  </tr>
  <tr>
    <td>P7</td>
    <td>"I judge people by their appearance"</td>
  </tr>
  <tr>
    <td>P8</td>
    <td>"I am not easily annoyed"</td>
  </tr>
  <tr>
    <td>P9</td>
    <td>"I try to forgive and forget"</td>
  </tr>
</table>

<h2>Covariates</h2>

<table border="1px">
  <tr>
    <th>Field</th>
    <th>Format</th>
    <th>Description</th>
  <TR>
    <td>country</td>
    <td>STRING</td>
    <td>The country the user connected from (based on IP address) in the form of ISO 3166 country codes, with some
      augmentations. The full key is below:
      <br/>
      <br/>A1, "Anonymous Proxy"
      <br/>A2, "Satellite Provider"
      <br/>O1, "Other Country"
      <br/>AD, "Andorra"
      <br/>AE, "United Arab Emirates"
      <br/>AF, "Afghanistan"
      <br/>AG, "Antigua and Barbuda"
      <br/>AI, "Anguilla"
      <br/>AL, "Albania"
      <br/>AM, "Armenia"
      <br/>AO, "Angola"
      <br/>AP, "Asia/Pacific Region"
      <br/>AQ, "Antarctica"
      <br/>AR, "Argentina"
      <br/>AS, "American Samoa"
      <br/>AT, "Austria"
      <br/>AU, "Australia"
      <br/>AW, "Aruba"
      <br/>AX, "Aland Islands"
      <br/>AZ, "Azerbaijan"
      <br/>BA, "Bosnia and Herzegovina"
      <br/>BB, "Barbados"
      <br/>BD, "Bangladesh"
      <br/>BE, "Belgium"
      <br/>BF, "Burkina Faso"
      <br/>BG, "Bulgaria"
      <br/>BH, "Bahrain"
      <br/>BI, "Burundi"
      <br/>BJ, "Benin"
      <br/>BL, "Saint Bartelemey"
      <br/>BM, "Bermuda"
      <br/>BN, "Brunei Darussalam"
      <br/>BO, "Bolivia"
      <br/>BQ, "Bonaire, Saint Eustatius and Saba"
      <br/>BR, "Brazil"
      <br/>BS, "Bahamas"
      <br/>BT, "Bhutan"
      <br/>BV, "Bouvet Island"
      <br/>BW, "Botswana"
      <br/>BY, "Belarus"
      <br/>BZ, "Belize"
      <br/>CA, "Canada"
      <br/>CC, "Cocos (Keeling) Islands"
      <br/>CD, "Congo, The Democratic Republic of the"
      <br/>CF, "Central African Republic"
      <br/>CG, "Congo"
      <br/>CH, "Switzerland"
      <br/>CI, "Cote d'Ivoire"
      <br/>CK, "Cook Islands"
      <br/>CL, "Chile"
      <br/>CM, "Cameroon"
      <br/>CN, "China"
      <br/>CO, "Colombia"
      <br/>CR, "Costa Rica"
      <br/>CU, "Cuba"
      <br/>CV, "Cape Verde"
      <br/>CW, "Curacao"
      <br/>CX, "Christmas Island"
      <br/>CY, "Cyprus"
      <br/>CZ, "Czech Republic"
      <br/>DE, "Germany"
      <br/>DJ, "Djibouti"
      <br/>DK, "Denmark"
      <br/>DM, "Dominica"
      <br/>DO, "Dominican Republic"
      <br/>DZ, "Algeria"
      <br/>EC, "Ecuador"
      <br/>EE, "Estonia"
      <br/>EG, "Egypt"
      <br/>EH, "Western Sahara"
      <br/>ER, "Eritrea"
      <br/>ES, "Spain"
      <br/>ET, "Ethiopia"
      <br/>EU, "Europe"
      <br/>FI, "Finland"
      <br/>FJ, "Fiji"
      <br/>FK, "Falkland Islands (Malvinas)"
      <br/>FM, "Micronesia, Federated States of"
      <br/>FO, "Faroe Islands"
      <br/>FR, "France"
      <br/>GA, "Gabon"
      <br/>GB, "United Kingdom"
      <br/>GD, "Grenada"
      <br/>GE, "Georgia"
      <br/>GF, "French Guiana"
      <br/>GG, "Guernsey"
      <br/>GH, "Ghana"
      <br/>GI, "Gibraltar"
      <br/>GL, "Greenland"
      <br/>GM, "Gambia"
      <br/>GN, "Guinea"
      <br/>GP, "Guadeloupe"
      <br/>GQ, "Equatorial Guinea"
      <br/>GR, "Greece"
      <br/>GS, "South Georgia and the South Sandwich Islands"
      <br/>GT, "Guatemala"
      <br/>GU, "Guam"
      <br/>GW, "Guinea-Bissau"
      <br/>GY, "Guyana"
      <br/>HK, "Hong Kong"
      <br/>HM, "Heard Island and McDonald Islands"
      <br/>HN, "Honduras"
      <br/>HR, "Croatia"
      <br/>HT, "Haiti"
      <br/>HU, "Hungary"
      <br/>ID, "Indonesia"
      <br/>IE, "Ireland"
      <br/>IL, "Israel"
      <br/>IM, "Isle of Man"
      <br/>IN, "India"
      <br/>IO, "British Indian Ocean Territory"
      <br/>IQ, "Iraq"
      <br/>IR, "Iran, Islamic Republic of"
      <br/>IS, "Iceland"
      <br/>IT, "Italy"
      <br/>JE, "Jersey"
      <br/>JM, "Jamaica"
      <br/>JO, "Jordan"
      <br/>JP, "Japan"
      <br/>KE, "Kenya"
      <br/>KG, "Kyrgyzstan"
      <br/>KH, "Cambodia"
      <br/>KI, "Kiribati"
      <br/>KM, "Comoros"
      <br/>KN, "Saint Kitts and Nevis"
      <br/>KP, "Korea, Democratic People's Republic of"
      <br/>KR, "Korea, Republic of"
      <br/>KW, "Kuwait"
      <br/>KY, "Cayman Islands"
      <br/>KZ, "Kazakhstan"
      <br/>LA, "Lao People's Democratic Republic"
      <br/>LB, "Lebanon"
      <br/>LC, "Saint Lucia"
      <br/>LI, "Liechtenstein"
      <br/>LK, "Sri Lanka"
      <br/>LR, "Liberia"
      <br/>LS, "Lesotho"
      <br/>LT, "Lithuania"
      <br/>LU, "Luxembourg"
      <br/>LV, "Latvia"
      <br/>LY, "Libyan Arab Jamahiriya"
      <br/>MA, "Morocco"
      <br/>MC, "Monaco"
      <br/>MD, "Moldova, Republic of"
      <br/>ME, "Montenegro"
      <br/>MF, "Saint Martin"
      <br/>MG, "Madagascar"
      <br/>MH, "Marshall Islands"
      <br/>MK, "Macedonia"
      <br/>ML, "Mali"
      <br/>MM, "Myanmar"
      <br/>MN, "Mongolia"
      <br/>MO, "Macao"
      <br/>MP, "Northern Mariana Islands"
      <br/>MQ, "Martinique"
      <br/>MR, "Mauritania"
      <br/>MS, "Montserrat"
      <br/>MT, "Malta"
      <br/>MU, "Mauritius"
      <br/>MV, "Maldives"
      <br/>MW, "Malawi"
      <br/>MX, "Mexico"
      <br/>MY, "Malaysia"
      <br/>MZ, "Mozambique"
      <br/>NA, "Namibia"
      <br/>NC, "New Caledonia"
      <br/>NE, "Niger"
      <br/>NF, "Norfolk Island"
      <br/>NG, "Nigeria"
      <br/>NI, "Nicaragua"
      <br/>NL, "Netherlands"
      <br/>NO, "Norway"
      <br/>NP, "Nepal"
      <br/>NR, "Nauru"
      <br/>NU, "Niue"
      <br/>NZ, "New Zealand"
      <br/>OM, "Oman"
      <br/>PA, "Panama"
      <br/>PE, "Peru"
      <br/>PF, "French Polynesia"
      <br/>PG, "Papua New Guinea"
      <br/>PH, "Philippines"
      <br/>PK, "Pakistan"
      <br/>PL, "Poland"
      <br/>PM, "Saint Pierre and Miquelon"
      <br/>PN, "Pitcairn"
      <br/>PR, "Puerto Rico"
      <br/>PS, "Palestinian Territory"
      <br/>PT, "Portugal"
      <br/>PW, "Palau"
      <br/>PY, "Paraguay"
      <br/>QA, "Qatar"
      <br/>RE, "Reunion"
      <br/>RO, "Romania"
      <br/>RS, "Serbia"
      <br/>RU, "Russian Federation"
      <br/>RW, "Rwanda"
      <br/>SA, "Saudi Arabia"
      <br/>SB, "Solomon Islands"
      <br/>SC, "Seychelles"
      <br/>SD, "Sudan"
      <br/>SE, "Sweden"
      <br/>SG, "Singapore"
      <br/>SH, "Saint Helena"
      <br/>SI, "Slovenia"
      <br/>SJ, "Svalbard and Jan Mayen"
      <br/>SK, "Slovakia"
      <br/>SL, "Sierra Leone"
      <br/>SM, "San Marino"
      <br/>SN, "Senegal"
      <br/>SO, "Somalia"
      <br/>SR, "Suriname"
      <br/>SS, "South Sudan"
      <br/>ST, "Sao Tome and Principe"
      <br/>SV, "El Salvador"
      <br/>SX, "Sint Maarten"
      <br/>SY, "Syrian Arab Republic"
      <br/>SZ, "Swaziland"
      <br/>TC, "Turks and Caicos Islands"
      <br/>TD, "Chad"
      <br/>TF, "French Southern Territories"
      <br/>TG, "Togo"
      <br/>TH, "Thailand"
      <br/>TJ, "Tajikistan"
      <br/>TK, "Tokelau"
      <br/>TL, "Timor-Leste"
      <br/>TM, "Turkmenistan"
      <br/>TN, "Tunisia"
      <br/>TO, "Tonga"
      <br/>TR, "Turkey"
      <br/>TT, "Trinidad and Tobago"
      <br/>TV, "Tuvalu"
      <br/>TW, "Taiwan"
      <br/>TZ, "Tanzania, United Republic of"
      <br/>UA, "Ukraine"
      <br/>UG, "Uganda"
      <br/>UM, "United States Minor Outlying Islands"
      <br/>US, "United States"
      <br/>UY, "Uruguay"
      <br/>UZ, "Uzbekistan"
      <br/>VA, "Holy See (Vatican City State)"
      <br/>VC, "Saint Vincent and the Grenadines"
      <br/>VE, "Venezuela"
      <br/>VG, "Virgin Islands, British"
      <br/>VI, "Virgin Islands, U.S."
      <br/>VN, "Vietnam"
      <br/>VU, "Vanuatu"
      <br/>WF, "Wallis and Futuna"
      <br/>WS, "Samoa"
      <br/>YE, "Yemen"
      <br/>YT, "Mayotte"
      <br/>ZA, "South Africa"
      <br/>ZM, "Zambia"
      <br/>ZW, "Zimbabwe"
    </td>
  </tr>
  <tr>
    <td>source</td>
    <td>FACTOR</td>
    <td>
      How the participant came to the test based on HTTP referrer (the url the link the user clicked was on).
      <br/>
      <br/>homepage = from front page of website that hosted the survey
      <br/>google = from google
      <br/>facebook = from facebook
      <br/>edu = from any url containing ".edu" (so "xxx.edu" or "xxx.edu.au" etc., typically it appears these are students in a course where the professor linked the test in their course management software (e.g. moodle))
      <br/>wikipedia = from Wikipedia
      <br/>other = from any other source or empty source (empty source=not provided or direct traffic)
    </td>
  </tr>
  <tr>
    <td>accuracy</td>
    <td>INTEGER</td>
    <td>
      After submission, subjects were instructed to indicate on a scale from 0000 the overall accuracy of their answers.
      Subjects were instructed to enter 0 if they did not want their data used. Only submissions with accuracy > 0 have been
      retained.
    </td>
  </tr>
  <tr>
    <td>elapse</td>
    <td>INTEGER</td>
    <td>Number of seconds between when the user started the test and when they submitted it .</td>
  </tr>
  <tr><td>age</td><td>INTEGER</td><td>Age in years, only ages >= 13 retained.</td></tr>
  <tr><td>gender</td><td>FACTOR</td><td>"male", "female, "other"</td></tr>
</table>