ISELECT= item selection criterion = *, all items

Items to be selected may be specified by using the ISELECT= instruction to match characters within the item name. Items deleted by IDELETE= or IDFILE= are never selected by ISELECT=.


This can be done before analysis in the control file or with "Extra specifications". It can also be done after the analysis using the "Specification" pull-down menu.


Selection rules:

Control characters match label or name. They start at the first column of the label or name.


matches any character


matches any string of characters - must be last selection character.

If * is in the first column, then every available person or item is selected.


matches A in the person label, and similarly all other characters except { }


braces characters which can match a single character: {ABC} matches A or B or C.

{.. - ..}

matches single characters in a range. {0-9} matches digits in the range 0 to 9.

{.. --..}

matches a single "-" {AB--} matches A or B or "-".


omits persons or items which match A or B or X


positions the next selection character at the start of the specified field


Each ISELECT= performed using the "Specification" pull-down menu selects from all those analyzed. For incremental selections from the Specification menu, i.e., selecting from those already selected, specify +ISELECT=


Example 0: In Example 10, select bank 6:

@BANK=5 ; Bank number is in column 5 of the item label



Example 1: Select for analysis only items with M in the 5th column of item name.

ISELECT=????M* M in column means Math items

0001M 2x4 ; selected

0002R the cat ; omitted



Example 2: Select for analysis all items with code "A 4" in columns 2-4 of their names.

ISELECT="?A 4*" quotes because a blank is included. A is in col. 2 etc.

ZA 4PQRS selected


Example 3: Select all Math (M in column 2) items which are Addition or Division (A or D in column 4):


1M3A456 2+2  selected

1M5D689 23/7  selected

1H2A123 George omitted (History, American)


Example 3: Select codes A, 1,2,3,4,5,6 in column 3:



Example 4: Select "- " in columns 2 and 3:



Example 5: Select "-" or "x" in column 2 with " " in column 3:

ISELECT="?{--x} "


Example 6: Analyze only math (column 4 or person-id). Then report only items in Topic C (column 1). Then only report items in Strands 4 and 5 (column 2) in Topic C.


ISELECT=???M* in the Control file or at the Extra Specifications prompt.

ISELECT=C*  using the Specification pull-down menu, after the analysis

+ISELECT=?{45}* using the Specification pull-down menu.


Example 7: 4 forms in one analysis with common items. Produce a score table for each form.

In the item labels, columns 1-4 of item label are form indicator. Items can be in more than one form

1xxx for form1 items

12xx for form 1 and 2 items

xx3x for form 3

xx34 for form 3 and 4



Then, use the Specification menu box:

ISELECT = 1??? will select all items on form 1

Output Tables: Table 20 score table

ISELECT = * select all items

ISELECT = ?2?? will select all items on form 2



Example 8: Omit unwanted items, marked by "x" in the first character of the item label:



Example 9: If the field to be selected is already identified, then this simplifies counting the column:

@Dx = 16E17 ; $C44W2

16E17 means that the field is in columns 16 and 17 of the item label. Look at a data record to see what is actually there.

ISELECT=???????????????23 ; selects "23" in columns 16 and 17 of the item label


Example 10: We want item type group X (in column 4 of the item label) except for sub-types 11, 24 (in columns 6, 7 of the item label):

ISELECT = "???X?{12}{14}"  ; this selects X and 11, 14, 21, 24


"?" "?????14" . ; convert 14 to missing data

"?" "?????21" . ; convert 21 to missing data



Example 11: multiple levels in the Specification menu box:

Between each step, in the Specification menu box, please specify ISELECT=   (nothing) to reinstate all the items.


Example using Example0.txt and the Specification menu box:



"ISELECT=L*" selected 5 ACT




"ISELECT=W*" selected 0 ACT


... not done



"ISELECT=*" selected 25 ACT




"ISELECT=W*" selected 7 ACT


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