This project was used in a study that used the Mechanical Turk platform to test a series of pie chart variations.
The study is built on the excellent Experimentr.js project.
The collected data file is in the analysis/results directory.
merged-data.csv: trial data with demographics data included on every row.
| Field Name | Description |
|---|---|
| subjectID | Subject ID in order of completion |
| time_start_time-trial | Unix time for beginning of the question |
| time_end_time-trial | Unix time for ending of the question (if this is missing, it is the same as time_end_trials from the demographics data) |
| rotation | Randomly selected rotation value showing the chart's rotation |
| log_error | Log absolute error as reported in the paper |
| inner_radius | Inner radius in pixels |
| totalSequence | Position within the entire study for that participant |
| arc_angle_area | answer to multiple choice question asking participant whether they preferred using arc-length, angle, or area in their judgements |
| judged_true | Judged answer minus true answer |
| ans_percentage_diff | (given-correct)/correct |
| opposite_ans | 100 - correct_ans |
| chart_type | Pie, Donut, Arc-Length, Area, Pie Angle, Pie Donut |
| ans_trial | Given answer |
| postID | ID generated by experimentr |
| time_diff_time | Time in miliseconds that it took to answer the question |
| correct_ans | Correct answer |
| age | Subject's reported age group |
| browser | Broswer |
| browserVersion | Browser version |
| comments | Comments |
| degree | Subject's self-reported highest attained degree |
| monitor | Subject reported monitor size in inches |
| participantCount | Count of participant that launched study |
| postID | experimentr generated ID |
| screenHeight | Browser reported screen height in pixels |
| screenWidth | Browser reported screen width in pixels |
| sex | Subject reported gender |
| windowHeight | Browser reported window height in pixels |
| windowWidth | Browser reported window width in pixels |
To run the project, you'll need Redis and Node.js.
To start the Redis server, run the following command from the project directory:
redis-server redis.conf
The Node server works on port 80, so it needs root access, and the project is set to use Forever.js to ensure it keeps running:
forever start app.js
Once you have the project running, you can visit localhost in your browser to see the survey.
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