Return to the Timed Likert Scale page
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										*TIMED LIKERT SCALE DEMO*
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Author: Katja Borchert, Ph.D. (katjab@millisecond.com) for Millisecond Software, LLC
Date: 02-20-2013
last updated:  11-05-2019 by K. Borchert (katjab@millisecond.com) for Millisecond Software, LLC

Script Copyright © 11-05-2019 Millisecond Software

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BACKGROUND INFO 	
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This script implements a demonstration of a Timed Likert scale as used by:

Ferrando, P.J. & Lorenzo-Seva, U. (2007). A Measurement Model for Likert Responses That Incorporates Response Time.
MULTIVARIATE BEHAVIORAL RESEARCH, 42, 675–706.

The likert scale implemented in this script has 5 anchors like the one used by Ferrando & Lorenzo-Seva (2007).
According to the article "A five-point response is the upper limit recommended by Fazio (1990) when the 
information provided by the latencies is taken into account. (p.677/678)"

NOTE:
The build-in Inquisit likert scale used in this script does NOT let participants change their original response. 

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TASK DESCRIPTION	
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Participants are asked to select a response button on a five-point- Likert Scale in response to a given statement.

The reciprocals of the reaction times (converted from ms to s, and corrected for large and small reaction times 
are calculated for each question (see Ferrando & Lorenzo-Seva, 2007)

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DURATION 
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the default set-up of the script takes under a minute to complete.

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

(1) Raw data file: 'timedlikert_raw*.iqdat' (a separate file for each participant)

build:							The specific Inquisit version used (the 'build') that was run
computer.platform:				the platform the script was run on (win/mac/ios/android)
date, time, 						date and time script was run 
subject, group, 					with the current subject/groupnumber
script.sessionid:					with the current session id

blockcode, blocknum:				the name and number of the current block (built-in Inquisit variable)
trialcode, trialnum: 				the name and number of the currently recorded trial (built-in Inquisit variable)
										Note: trialnum is a built-in Inquisit variable; it counts all trials run; even those
										that do not store data to the data file such as feedback trials. Thus, trialnum 
										may not reflect the number of main trials run per block.
									
stimulusitem:						the presented stimuli in order of trial presentation
response:						the participant's response (scancode of response buttons)
latency: 							the response latency (in ms); measured from: onset of stim

expressions.corrected_rt_s:		corrected RT for large (>40) and small (< 0.5) reaction times (measured in seconds NOT ms)
								as suggested by Ferrando & Lorenzo-Seva (2007), p.689
									
expressions.reciprocal_rt_s:		the inverse of the reaction times (measured in seconds NOT ms)
 
(2) Summary data file: 'timedlikert_summary*.iqdat' (a separate file for each participant)

computer.platform:				the platform the script was run on (win/mac/ios/android)
script.startdate:					date script was run
script.starttime:					time script was started
script.subjectid:					assigned subject id number
script.groupid:					assigned group id number
script.sessionid:					assigned session id number
script.elapsedtime:				time it took to run script (in ms); measured from onset to offset of script
script.completed:					0 = script was not completed (prematurely aborted); 
								1 = script was completed (all conditions run)

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CUSTOMIZE ITEMS
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* Go to section EDITABLE STIMULI -> item.questions to edit/add items of interest
* Go to ssection BLOCKS -> block.timedlikert to edit the number of times the likert trial needs to be called

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EDITABLE CODE 
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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:

/questionfontsize:				sets the fontsize of the question in canvas percentages (default: 5%)