Ah, this helps a lot. At 09:16 PM 4/10/2008, Michael Kruger wrote:

>I have frequency data in two rows ('select if row_no EQ 1 OR row_no >EQ 477 to start with). The row 1 has the control frequencies and row >477 the treatment frequencies. I am running my statistical procedure >on these two rows and then need to increment my syntax statemtn to >read 'row 2 OR row 478', then run the analysis; and so on until I >end with 'select if row_no eq 476 aOR row_no eq 952'.

OK: you're running the same procedure on multiple sets of *cases*.

The most efficient way to do that is with SPLIT FILES, which can run the same procedure over a set of subsets of the cases, in one data pass. (You could also use a macro loop, but it would be MUCH harder to write, and much less efficient.)

This isn't tested, but I think it's in the right direction:

NUMERIC ExptGrp (F5) CaseCtrl (F2). VAL LABELS CaseCtrl 1 'Control' 2 'Treatment'.

DO IF row_no LE 476 /* Control lines */. . COMPUTE ExptGrp = row_no. . COMPUTE CaseCtrl = 1. ELSE /* Treatment lines */. . COMPUTE ExptGrp = row_no - 476. . COMPUTE CaseCtrl = 2. END IF.

SORT CASES BY ExptGrp CaseCtrl. SPLIT FILE BY ExptGrp. <<run statistical procedure>>

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