Logistic regression puzzle

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URL: http://spssx-discussion.165.s1.nabble.com/Logistic-regression-puzzle-tp5740366.html

Dear experts,

a colleague wants to do a logistic regression with NOMREG and gets this result:

Case Processing Summary

N Marginal Percentage

test ,00 358 35,8%

1,00 642 64,2%

Valid 1000 100,0%

Missing 0

Total 1000

Subpopulation 221a*

*a The dependent variable has only one value observed in 131 (59,3%) subpopulations.

Q. 1: What does "Subpopulation" and the number 221 refer to?

Q. 2: What is the meaning of remark a and the number 131?

Here's her syntax:

NOMREG test (BASE=FIRST ORDER=ASCENDING) WITH 

v1 v2 v3 v4 v5 v6 v7 v8 v9 v10

  /CRITERIA CIN(95) DELTA(0) MXITER(100) MXSTEP(5) CHKSEP(20) LCONVERGE(0) PCONVERGE(0.000001) 

    SINGULAR(0.00000001)

  /MODEL

  /STEPWISE=PIN(.05) POUT(0.1) MINEFFECT(0) RULE(SINGLE) ENTRYMETHOD(LR) REMOVALMETHOD(LR)

  /INTERCEPT=INCLUDE

  /PRINT=Classtable PARAMETER SUMMARY LRT CPS STEP MFI.

Thanks for any idea.

Mario Giesel

Munich, Germany

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