excluding cases test-by-test - nonparametric two sample tests

[Thomas Burley]

Hi,

I am doing some nonparametric two-independent-sample tests using SPSS
15. I'm trying to figure out what exactly the option exclude cases
test-by-test means.

 

Here's the output file syntax for one that I did:

NPAR TESTS

  /M-W= Ammonia_Nitrogen_LOG DO_LOG Conduct_LOG Flow_Inst_LOG N02_3_LOG

  PH_LOG TEMP_LOG Tot_Hrd_LOG Tot_KN_LOG Total_P_LOG TSS_LOG
Turbidity_LOG

  BY ID(2 9)

  /MISSING ANALYSIS

  /METHOD=MC CIN(95) SAMPLES(100000).

 

so as you can see it's a basic nonparametric test.

 

 

All the SPSS help tells me is this:

> Exclude cases test-by-test. When several tests are specified, each
test is evaluated separately for missing values.

 

This does not make it clear as to how cases are handled if they have
missing values. I understand the exclude cases listwise option, but the
test-by-test option is a little nebulous.

 

I much appreciate any explanation of this that actually tells me what
the program does when that option is selected!!

 

Thanks!

--Tom

 

 

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[peter link]

Tom -

I believe the test-by-test option will delete cases from analysis based only
on the variables considered in that test (not from all variables selected to
be tested).  If you do more than 1 test at a time, you may be using
different samples test to test, using this method (depending on
missingness).

Peter Link
VA San Diego Healthcare System

-----Original Message-----
From: SPSSX(r) Discussion [mailto:[hidden email]]On Behalf Of
Burley, Thomas Edward (Tom)
Sent: Tuesday, August 12, 2008 1:40 PM
To: [hidden email]
Subject: excluding cases test-by-test - nonparametric two sample tests


Hi,

I am doing some nonparametric two-independent-sample tests using SPSS
15. I'm trying to figure out what exactly the option exclude cases
test-by-test means.



Here's the output file syntax for one that I did:

NPAR TESTS

  /M-W= Ammonia_Nitrogen_LOG DO_LOG Conduct_LOG Flow_Inst_LOG N02_3_LOG

  PH_LOG TEMP_LOG Tot_Hrd_LOG Tot_KN_LOG Total_P_LOG TSS_LOG
Turbidity_LOG

  BY ID(2 9)

  /MISSING ANALYSIS

  /METHOD=MC CIN(95) SAMPLES(100000).



so as you can see it's a basic nonparametric test.





All the SPSS help tells me is this:

> Exclude cases test-by-test. When several tests are specified, each
test is evaluated separately for missing values.



This does not make it clear as to how cases are handled if they have
missing values. I understand the exclude cases listwise option, but the
test-by-test option is a little nebulous.



I much appreciate any explanation of this that actually tells me what
the program does when that option is selected!!



Thanks!

--Tom





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For a list of commands to manage subscriptions, send the command
INFO REFCARD

=====================
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[hidden email] (not to SPSSX-L), with no body text except the
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For a list of commands to manage subscriptions, send the command
INFO REFCARD