___________________________________________________________________________________________________________________ Hypothetical Purchase Task (HPT) Questionnaire ___________________________________________________________________________________________________________________ Script Author: Katja Borchert, Ph.D. (katjab@millisecond.com) for Millisecond Software, LLC Date: 03-02-2018 last updated: 02-23-2022 by K. Borchert (katjab@millisecond.com) for Millisecond Software, LLC Script Copyright © 02-23-2022 Millisecond Software ___________________________________________________________________________________________________________________ BACKGROUND INFO ___________________________________________________________________________________________________________________ This script implements a computerized Hypothetical Purchase Task Questionnaire based on: Roma, P. G., Hursh, S. R., and Hudja, S. (2016). Hypothetical Purchase Task Questionnaires for Behavioral Economic Assessments of Value and Motivation. Manage. Decis. Econ., 37: 306–323. doi: 10.1002/mde.2718. ___________________________________________________________________________________________________________________ OVERVIEW ___________________________________________________________________________________________________________________ Participants are asked to answer how many items of a certain commodity (here as example: burgers/sandwiches) they would buy at 9 different price points during a particular time frame (here: one month). The 9 different price points start at 0 and end at 100 times the anchor price (which is also the median of the 9 price points). ___________________________________________________________________________________________________________________ DURATION ___________________________________________________________________________________________________________________ the default set-up of the script takes appr. 2 minutes to complete ___________________________________________________________________________________________________________________ DATA FILE INFORMATION ___________________________________________________________________________________________________________________ The default data stored in the data files are: (1) Raw data file: 'hpt.iqdat' date, time: date and time script was run with the current group/subjectnumber subject, group, session: with the current subject/groupnumber/session id build: the Inquisit build q*_response: response given (in assigned values) q*_latency: how much time (in ms) the participant spent on the surveypage with this particular question (the last time this particular surveypage was visited) (2) Summary data file: 'hpt_summary.iqdat' (Inquisit Lab: one data file per participant) inquisit.version: Inquisit version run computer.platform: the platform the script was run on (win/mac/ios/android) startDate: date script was run startTime: time script was started subjectid: assigned subject id number groupid: assigned group id number sessionid: assigned session id number elapsedTime: time it took to run script (in ms); measured from onset to offset of script completed: 0 = script was not completed (prematurely aborted); 1 = script was completed (all conditions run)) ///parameter settings: targetCommodity: the target commodity (here: "burger/sandwich") priceDensity: the price density (low, medium, high) of the commodity in question (here: medium for burgers) median_anchorPrice: the anchor price of the commodity in question (here: $5.00 for a burger/sandwich) timeFrame: the time frame (default: "1 month") v1: the minimum price point (free) textbox.v1.response1: the entered number of hypothetical burgers bought at this price point ... v5: the median price point (the anchor) textbox.v5.response: the entered number of hypothetical burgers bought at this price point ... v9: the maximum price point (100 times the anchor value) textbox.v9.response: the entered number of hypothetical burgers bought at this price point ___________________________________________________________________________________________________________________ INSTRUCTIONS ___________________________________________________________________________________________________________________ see section Editable Instructions. To change commodity, change instructions and image under section Editable Instructions ___________________________________________________________________________________________________________________ EDITABLE CODE ___________________________________________________________________________________________________________________ check below for (relatively) easily editable parameters, stimuli, instructions etc. Keep in mind that you can use this script as a template and therefore always "mess" with the entire code to further customize your experiment. The parameters you can change are: /targetCommodity: the target commodity (here: "burger/sandwich") /priceDensity: the price density (low, medium, high) of the commodity in question (here: medium for burgers) /median_anchorPrice: the anchor price of the commodity in question in $ (here: $5.00 for a burger/sandwich) /timeFrame: the time frame (default: "1 month")