Dear All
After many discussions with my supervisor i am all confused :(
Am i correct with the assumption that a high D-Score always stands for the associationstrength of the compatible Block?
In My Script i have the following components (i used the Inquisit-Script and just changed the items for the two attributes and the two targets - see the attachment):
AttributeA: Postive
Attribute B: Negative
TargetA: Generation
TargetB: Agegroup
This means the higher my D-Score the higher is the preference of a subject for its Generation in contrast to its age group? -> preference for TargetA-Attribute A?
My second question concerns the modification of the Inquisit Syntax-File: I want to calculate the D-Score without the practice Blocks. Therefor I deleted everything which concerns the test1 (practice blocks) and modified the D-bieb (see the syntax below - changes are bold and underlined):
VALUE LABELS blocknum
1 'Target practice'
2 'Attribute practice'
3 'First pairing practice'
5 'First pairing test'
6 'Reversed target practice'
7 'Second pairing practice'
9 'Second pairing test' .
IF (MOD(subject,2) = 1) ORDER = 1 .
IF (MOD(subject,2) = 0) ORDER = 2 .
COMPUTE PAIRING = 0.
IF ((ORDER=1) and (blocknum=3|blocknum=5)) PAIRING = 1.
IF ((ORDER=1) and (blocknum=7|blocknum=9)) PAIRING = 2.
IF ((ORDER=2) and (blocknum=7|blocknum=9)) PAIRING = 1.
IF ((ORDER=2) and (blocknum=3|blocknum=5)) PAIRING = 2.
COMPUTE TEST = 0.
IF (blocknum=3|blocknum=7) TEST = 1.
IF (blocknum=5|blocknum=9) TEST = 2.
VALUE LABELS
TEST 0 'single-task practice' 1 '1st combined block' 2 '2nd combined block'
/ correct 0 'error' 1 'correct' .
VARIABLE LABELS
correct "0=error, 1=correct"
/ blocknum "block number"
/ trialnum "trial number"
/ ORDER "order of combined tasks"
/ PAIRING "paired categories"
/ TEST "1st or 2nd combined block".
VALUE LABELS
PAIRING
0 'single task practice'
1 'compatible'
2 'incompatible'
/ ORDER
1 'compatible first'
2 'incompatible first'.
COMPUTE error = 100*(1 - correct).
* Save data to re-use for computing other measures .
SAVE OUTFILE = 'temp.sav' .
DESCRIPTIVES ALL .
SUMMARIZE TABLES latency BY TEST BY PAIRING.
GET FILE = 'temp.sav' .
* Use data for Blocks 3,5,7, and 9 (i.e., TEST = 1 or 2) .
SELECT IF (TEST=2) .
* Mark trials with latency < 300 ms (for possible subject discard) .
COMPUTE FLAG_300 = 0 .
IF (LATENCY < 300) FLAG_300 = 1 .
* Mark trials with latency < 400 ms (to provide a count of these) .
COMPUTE FLAG_400 = 0 .
IF (LATENCY < 400) FLAG_400 = 1 .
* Mark trials with latency > 10000 ms (to provide a count of these) .
COMPUTE FLAG_10K = 0 .
IF (LATENCY GT 10000) FLAG_10K = 1 .
* Following line can be used to check frequencies of fast & slow responses & errors .
FREQUENCIES FLAG_300 FLAG_400 FLAG_10K ERROR .
* Record criteria for potential use in subject discards .
* This count can later be used as the basis for subject discard .
AGGREGATE OUTFILE = 'CRITERIA.SAV'
/ BREAK = SUBJECT ORDER
/ PCT_300 = PGT(FLAG_300,0)
/ PCT_400 = PGT(FLAG_400,0)
/ PCT_10K = PGT(FLAG_10K,0)
/ AVELTNCY ERRORPCT = MEAN (LATENCY ERROR)
/ NTRIALS = N .
* Drop trials slower than 10000 ms for LATENCY .
SELECT IF (LATENCY LE 10000) .
*Drop dummy trials at beginning of blocks .
SELECT IF (trialnum gt 1).
* The following line deletes latencies less than 300. To prevent these trials from being
* discarded, add an asterisk before the next line to comment it out.
* SELECT IF (LATENCY GE 300) .
DESCRIPTIVES ALL.
* The following aggregate command computes block means and SDs needed for the D measures.
AGGREGATE OUTFILE = *
/ BREAK = SUBJECT BLOCKNUM ORDER PAIRING TEST
/ MEAN_LAT MEAN_ERR = MEAN(latency error) / SD_LAT = SD(latency)
/ NTRIALS = N .
DESCRIPTIVES ALL.
*Save this as a record of this stage of analysis .
SAVE OUTFILE = 'BIEP.ALL_MEANS&SDs.SAV' .
IF (PAIRING = 1) N1 = NTRIALS .
IF (PAIRING = 2) N2 = NTRIALS .
IF (PAIRING = 1) M1 = MEAN_LAT .
IF (PAIRING = 2) M2 = MEAN_LAT .
IF (PAIRING = 1) ERR1 = MEAN_ERR .
IF (PAIRING = 2) ERR2 = MEAN_ERR .
IF (PAIRING = 1) SD1 = SD_LAT .
IF (PAIRING = 2) SD2 = SD_LAT .
AGGREGATE OUTFILE = *
/ BREAK = SUBJECT ORDER TEST
/ M1 M2 ERR1 ERR2 N1 N2 SD1 SD2 =
FIRST(M1 M2 ERR1 ERR2 N1 N2 SD1 SD2) .
*Save this as a record of this stage of analysis .
SAVE OUTFILE = 'BIEP.MEANS&SDS.SAV' .
IF(TEST=2) ERR1b = ERR1 .
IF(TEST=2) ERR2b = ERR2 .
* These are the numerator components in millisecond units.
IF(TEST=2) M1b = M1 .
IF(TEST=2) M2b = M2 .
IF(TEST=2) SD1b = SD1 .
IF(TEST=2) SD2b = SD2 .
IF(TEST=2) N1b = N1 .
IF(TEST=2) N2b = N2 .
COMPUTE D_asis_num = M2 - M1.
*Use SD based on all responses (StanDevX) as denominator for D_biep .
COMPUTE D_asis_denom = SQRT( ( ((N1-1) * SD1**2 + (N2-1) * SD2**2)
+ ((N1+N2) * ((M1-M2)**2) / 4) ) / (N1 + N2 - 1) ) .
IF (TEST=2) D_BIEP_b = D_asis_num / D_asis_denom .
IF (TEST=2) Nb = N1+N2 .
DESCRIPTIVES ALL .
AGGREGATE OUTFILE = *
/ BREAK = SUBJECT ORDER
/ D_biep_a D_biep_b M1a M2a M1b M2b ERR1a ERR2a ERR1b ERR2b Na Nb =
FIRST(D_biep_a D_biep_b M1a M2a M1b M2b ERR1a ERR2a ERR1b ERR2b Na Nb).
VARIABLE LABELS
D_biep_b 'd score 2nd blocks'
/ Na '# trials, 1st combined blocks'
/ Nb '# trials, 2nd combined blocks'
/ M1a 'Mn Lat. 1st block, pairing 1'
/ M2a 'Mn Lat. 1st block, pairing 2'
/ M1b 'Mn Lat. 2nd block, pairing 1'
/ M2b 'Mn Lat. 2nd block, pairing 2'
/ ERR1a 'Error % 1st block, pairing 1'
/ ERR2a 'Error % 1st block, pairing 2'
/ ERR1b 'Error % 2nd block, pairing 1'
/ ERR2b 'Error % 2ns block, pairing 2'
/ SUBJECT 'Session ID' .
COMPUTE ERR_1 = (ERR1a + ERR1b) / 2 .
COMPUTE ERR_2 = (ERR2a + ERR2b) / 2 .
VARIABLE LABELS
ERR_1 'Error % for Pairing 1 (both combined tasks)'
/ ERR_2 'Error % for Pairing 2 (both combined tasks)' .
*Compute unweighted combination of measures based on first and second blocks
of combined tasks.
* !! Do this even if there are fewer trials in the first block because the
* first block has been found to have as good or better validity, even with
* fewer trials (see Greenwald, Nosek, & Banaji, JPSP 2003) .
COMPUTE D_biep = (D_biep_b) .
EXECUTE.
VARIABLE LABELS
D_biep 'd score all blocks' .
I am so sorry to bug you with the IAT - but i would appreciate any help!
Best regards
Sabi