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.

 

 

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

ISELECT=@BANK=6

 

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

END NAMES

 

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):

ISELECT="?M?{AD}*"

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:

ISELECT=??{A1-6}*

 

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

ISELECT="?- "

 

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

etc.

 

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

etc.

 

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

ISELECT={~x}

 

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

EDFILE=*

"?" "?????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

"ISELECT=L*" selected 5 ACT

CURRENTLY REPORTABLE ACT = 5

 

iselect=W

"ISELECT=W*" selected 0 ACT

CURRENTLY REPORTABLE ACT = 5

... not done

 

iselect=

"ISELECT=*" selected 25 ACT

CURRENTLY REPORTABLE ACT = 25

 

iselect=W

"ISELECT=W*" selected 7 ACT

CURRENTLY REPORTABLE ACT = 7

Coming Rasch-related Events
July 31 - Aug. 3, 2017, Mon.-Thurs.	Joint IMEKO TC1-TC7-TC13 Symposium 2017: Measurement Science challenges in Natural and Social Sciences, Rio de Janeiro, Brazil, imeko-tc7-rio.org.br
Aug. 7-9, 2017, Mon-Wed.	In-person workshop and research coloquium: Effect size of family and school indexes in writing competence using TERCE data (C. Pardo, A. Atorressi, Winsteps), Bariloche Argentina. Carlos Pardo, Universidad Catòlica de Colombia
Aug. 7-9, 2017, Mon-Wed.	PROMS 2017: Pacific Rim Objective Measurement Symposium, Sabah, Borneo, Malaysia, proms.promsociety.org/2017/
Aug. 10, 2017, Thurs.	In-person Winsteps Training Workshop (M. Linacre, Winsteps), Sydney, Australia. www.winsteps.com/sydneyws.htm
Aug. 11 - Sept. 8, 2017, Fri.-Fri.	On-line workshop: Many-Facet Rasch Measurement (E. Smith, Facets), www.statistics.com
Aug. 18-21, 2017, Fri.-Mon.	IACAT 2017: International Association for Computerized Adaptive Testing, Niigata, Japan, iacat.org
Sept. 15-16, 2017, Fri.-Sat.	IOMC 2017: International Outcome Measurement Conference, Chicago, jampress.org/iomc2017.htm
Oct. 13 - Nov. 10, 2017, Fri.-Fri.	On-line workshop: Practical Rasch Measurement - Core Topics (E. Smith, Winsteps), www.statistics.com
Jan. 5 - Feb. 2, 2018, Fri.-Fri.	On-line workshop: Practical Rasch Measurement - Core Topics (E. Smith, Winsteps), www.statistics.com
Jan. 10-16, 2018, Wed.-Tues.	In-person workshop: Advanced Course in Rasch Measurement Theory and the application of RUMM2030, Perth, Australia (D. Andrich), Announcement
Jan. 17-19, 2018, Wed.-Fri.	Rasch Conference: Seventh International Conference on Probabilistic Models for Measurement, Matilda Bay Club, Perth, Australia, Website
April 13-17, 2018, Fri.-Tues.	AERA, New York, NY, www.aera.net
May 25 - June 22, 2018, Fri.-Fri.	On-line workshop: Practical Rasch Measurement - Core Topics (E. Smith, Winsteps), www.statistics.com
June 29 - July 27, 2018, Fri.-Fri.	On-line workshop: Practical Rasch Measurement - Further Topics (E. Smith, Winsteps), www.statistics.com
Aug. 10 - Sept. 7, 2018, Fri.-Fri.	On-line workshop: Many-Facet Rasch Measurement (E. Smith, Facets), www.statistics.com
Oct. 12 - Nov. 9, 2018, Fri.-Fri.	On-line workshop: Practical Rasch Measurement - Core Topics (E. Smith, Winsteps), www.statistics.com
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