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								Hypothetical Purchase Task (HPT) Questionnaire
SCRIPT INFO

Script Author: Katja Borchert, Ph.D. (katjab@millisecond.com) for Millisecond Software, LLC
Date: 03-02-2018
last updated:  03-06-2018 by K.Borchert for Millisecond Software LLC

Script Copyright © 03-06-2018 Millisecond Software


BACKGROUND INFO

											*Purpose*
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.


											  *Task*
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).
											  

DATA FILE INFORMATION: 
The default data stored in the data files are:

(1) Raw data file: 'hpt.iqdat'

date, time, group, subject:		date and time script was run with the current group/subjectnumber 
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)

script.startdate:				date script was run
script.starttime:				time script was started
script.subjectid:				subject id number
script.groupid:					group id number
script.elapsedtime:				time it took to run script (in ms)
computer.platform:				the platform the script was run on
/completed:						0 = script was not completed (prematurely aborted); 1 = script was completed (all conditions run)
/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)
radiobuttons.v1.response:		the entered number of hypothetical burgers bought at this price point 
...
/v5:							the median price point (the anchor)
radiobuttons.v1.response:		the entered number of hypothetical burgers bought at this price point 
...
/v9:							the maximum price point (100 times the anchor value)
radiobuttons.v1.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")
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