GENERIC IAT SPSS SYNTAX copyright by A. G. Greenwald, IAT Corp, 2001-2007. ************************************************************************ * THIS SOFTWARE SHOULD NOT BE DISTRIBUTED TO OTHERS. THOSE INTERESTED * * IN OBTAINING A CURRENT VERSION SHOULD CHECK AGG’S WEBSITE AT: * * http://faculty.washington.edu/agg (Click the link to IAT MATERIALS) * ************************************************************************ * THIS SYNTAX HAS BEEN DEBUGGED AND IS BELIEVED TO BE WORKING CORRECTLY. HOWEVER, IF * YOU DISCOVER ANY PROBLEMS, PLEASE INFORM agg@u.washington.edu OF THE PROBLEM. *** A minor problem in the two error-penalty syntaxes was fixed on 26 Aug 2007. *** The error was that latencies greater than 10000 ms were not deleted in the *** final computation of D measures. Thanks to Klaske Glashouwer of University *** of Groningen for bringing this to my attention. * There are three SPSS generic syntax files. They compute the improved IAT . * D measure in three different forms. All are designed to be used in conjunction . * with an Inquisit .dat file produced by the Inquisit Generic IAT script. (See * instructions for that in a separate .txt file.) * References to D1-D6 below correspond to the six D measures described in the JPSP * 2003 article that reporting the improved algorithm: * Greenwald, A. G, Nosek, B. A., & Banaji, M. R. (2003). Understanding and using * the Implicit Association Test: I. An improved scoring algorithm. Journal of * Personality and Social Psychology, 85, 197-216. * The three forms of SPSS syntax are produced by using MS Word's Mail Merge * capability on the three .doc files described just below. These three differ * in the first several letters of their filenames and function slightly * differently. These correspond to the three of the six D measures described * in the JPSP 2003 article. They are: *"D_biep.Inquisit Generic IAT SPSS syntax form.26Aug07.doc" * Computes the D1 measure (using "built in" error penalty produced by the procedure * of requiring correct response on each trial and recording latency to occurrence of * that response (even after prior occurrence of an error response). *"D_2SDep.Inquisit Generic IAT SPSS syntax form.26Aug07.doc" * Computes the D3 measure (replacing error latencies with mean of correct * latencies from the block in which the error occurred plus twice the SD of * correct latencies). *"D_600ep.Inquisit Generic IAT SPSS syntax form.26Aug07.doc" * Computes the D4 measure (replacing error latencies with mean of correct latencies * from the block in which the error occurred plus 600 milliseconds). *D2, D5, and D6 can be computed from the three files, respectively, by enabling the * optional deletion of trials with latencies below 400 milliseconds. *MEANS and SDs for individual blocks of trials can be found in the file * "BIEP.MEANS&SDS.SAV", which is produced by the D_biep... form of the syntax file. * The corresponding files produced by other syntaxes have means computed using * replacement latencies for error trials, so don't correspond to the raw data. * Error rates can also be read from that file. *The following instructions apply equally to all three of the SPSS syntax .doc files. *---------------------- . * OPERATING INSTRUCTIONS: CREAING THE .sps FILE . *---------------------- . *THESE INSTRUCTIONS ASSUME THAT YOU HAVE CREATED AN INQUISIT IAT PROGRAM (.exp * FILE) USING THE WORD .doc FILE, "GenericIATsyntaxForm.26Nov05.doc". THIS * MERGE AND SAVE IS THAN CONDUCTED IN FASHION SIMILAR TO MERGING AND SAVING * THE .exp FILE, USING THE SAME RECORD IN THE ASSOCIATED DATA SOURCE FILE * ('GenericIATdata.doc') THAT WAS USED TO CREATE THE .exp FILE. * *WHAT MUST BE DONE IN STEPS (3)-(7) MAY VARY DEPENDING ON YOUR VERSION OF * MS WORD AND YOUR OPERATING SYSTEM. THIS DESCRIPTION IS ACCURATE FOR THE * VERSION OF WORD IN OFFICE 2003 PROFESSIONAL, RUNNING UNDER WINDOWS XP * PROFESSIONAL. * * (1) Open the document ('GenericIATsyntaxForm.29Dec07.doc'). * (2) IF it does not open as a Merge document with Data Source selected, then open * Merge Helper by selecting Letters and Mailing in the Tools menu, and * clicking Mail Merge. This should show a MailMerge Task Pane. Advance (at * bottom) to Step 3 ("Select Recipients") and select "Use an existing list". * "Browse" for the file 'GenericIATdata.doc' to use as the existing list. To * view contents of the data source file, you can select "Edit recipient list". * If you select Recipient 7, you can create a file that will analyzes the Inquisit * data file, "Flower-Insect Attitude.dat". * (3) Advance to Mail Merge Step 5 ('Preview your letters'). * (4) At the File menu, click "Save As", then * (5) Select 'Plain Text' in the "Save as type" field under the filename * (6) Provide an appropriate file name and give it an 'sps' extension * (replacing the default 'txt' extension). Save into the same folder that * contains the .dat file you wish to analyze. If asked for File Conversion * options, select the 'Windows default'. * (7) You should then be able to run the saved .sps syntax by double-clicking its * filename in Windows Explorer. * *This syntax will work without detailed path names if SPSS is started by * double-clicking this syntax (.sps) filename in order to start SPSS, *IF* this * syntax file is located in the same folder containing the Inquisit data (.dat) * file that contains the data you wish to analyze. * To check your results, here are the results that should be obtained from analyzing * "Flower-Insect Attitude.dat". * D_biep D_2SDep D_600ep * Subject 1 -1.054 -1.140 -0.410 * Subject 2 -1.029 -1.236 -0.748 * * These results are consistent with thinking that the 2SD error penalty (D_2SDep) * is more useful than the 600 ms error penalty (D_600ep). * This is especially true for a subject who has a small error SD (as did the subject * who provided data for both Subject=1 and Subject=2.