Millisecond Forums

The various D measures are running calculations, i.e., their values will be updated on a trial-by-trial basis as the relevant data trickles in. As long as no such data is available (e.g., at the beginning of the task during attribute practice), there will of course be no data in the respective columns -- no data, no Ds.

Generally see https://www.millisecond.com/forums/Topic3444.aspx.

That is what I thought.......

I did go back and compare it to the original IAT script....I even tried reinserting the "summary block" but still have not got anything. 

Here is my data columns section:

<data>

/ columns = [date, time, subject, blockcode, blocknum, trialcode, trialnum, response, correct, latency, stimulusnumber, stimulusitem, expressions.da, expressions.db, expressions.d ]

</data>

I wont bother posting each block, but it is identical to the original.

Where should  expression.db etc be calculated?

Deleting the summary block (or rather removing it from your <expt> / <variables> elements so it's not run) should in no way, shape or form affect data recording. The summary block is not instrumental in that regard. You may have accidentally deleted or modified other parts of the script (e.g. the <data> element). I'd recommend you go back to the unmodified original and compare it to your current script to get an overview of the differences.

Regards,

~Dave