Exclude cases over mean plus 2 times sd

 

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* (Q) How can I exclude cases which exceeds mean + 2 *SD ?

*(A) Posted to by Raynald Levesque to SPSSX-L 2003/01/29.
* Visit my SPSS site at http://pages.infinit.net/rlevesqu/index.htm

***************.
* Method 1, add mean and sd to data file then use SELECT IF.
***************.

GET FILE='c:\\program files\\spss\\employee data.sav'.

SORT CASES BY salary.
COMPUTE nobreak=1.
AGGREGATE OUTFILE='c:\\temp\\sal.sav'
	/PRESORTED
	/BREAK=nobreak
	/meansal=MEAN(salary) /sdsal=SD(salary).

MATCH FILES FILE=*
	/TABLE='c:\\temp\\sal.sav'
	/BY=nobreak.

SELECT IF (salary< meansal + 2*sdsal).
EXECUTE.

***************.
* Method 2, find z scores of salary, then keep only values within -2 and 2.
***************.
GET FILE='c:\\program files\\spss\\employee data.sav'.

DESCRIPTIVES
  VARIABLES=salary  /SAVE
  /STATISTICS=MEAN STDDEV .

SELECT IF ABS(zsalary) < 2.
EXECUTE.
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