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						TIMELINE FOLLOWBACK TEMPLATE (last 30 days) - Example: Cannabis

Script Author: Katja Borchert, Ph.D. ( for Millisecond Software, LLC
Date: 05-20-2013
last updated:  08-15-2015 by K.Borchert for Millisecond Software LLC

Script Copyright ©  08-15-2015 Millisecond Software


This script implements a Cannabis Timeline Follow-Back calendar.
For more information about Timeline Follow-Backs at:

Participants are asked to fill out a calendar with their cannabis use for the last 30 days, 
starting with yesterday.

The default data stored are:

Data file: 'TimelineFollowback*.iqdat' (a separate file for each participant)

build:							Inquisit build
computer.platform:				the platform the script was run on
date, time, subject, group:		date and time script was run with the current subject/groupnumber 
script.elapsedtime:				time it took to run script (in ms)
/completed:						0 = script was not completed (script prematurely aborted); 1 = script was completed (all conditions run)
trialcode: 						the name  of the currently recorded trial
									(Note: not all trials that are run might record data) 
/yesterday_date:				stores yesterday's date as a string (e.g. 5/20/2013)
/yesterday_weekday:				stores yesterday's weekday as an integer (e.g. 1 for Monday, ..., 7 for Sunday)
/leapyear:						stores whether the year is a leap year

/date11:						individual dates of each of the calendar boxes (e.g. 11 = 1st row, 1st column....61 = 6th row, 1st column)
/date61 = ""

/totalamount:					sums up all the quantities that participants reported over the 30 day span; regardless of method
/mean_amount:					mean daily quantity consumed (over 30 days); regardless of method
/count_nouse:					sums up how often a participant has checked the nouse checkbox

1. Screen that asks for information input about start day ("yesterday") -> year, leap year, month, day, weekday
2. Screen that displays instructions (edit instructions under EDITABLE CODE -> Editable Instructions)
3. Calendar Display: a calendar display with the last 30 days filled in with the appropriate days
(all 30 days are displayed on one page)
=> each days asks for a) quantity b) method or c) No use checkbox
=> a screenshot is taken of the filled in calendar (default; works on Inquisit Lab only)
=> computer totals the quantities and calculates mean quantity for the last 30 days
=> computer totals the number of times participants select "no use"

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.

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