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  • 1.  Mann Whitney test question

    Posted Tue February 08, 2022 01:57 PM
    Hi everyone,

    just a quick question..

    I have a non parametric dataset and wanna apply Mann Whitney tests and Kruskal Wallis.
    My categorical variable in Mann whitney test is the Internet Addiction (N=9520) and not Internet addiction (N=4586), Total N=14206.

    When I am doing the Mann whitney test it seems that there are different number of participants in each comparison.

    for example: Stress with no Internet addiction (N=5469)
                         Stress with internet addiction (N=3298)
                                                   Total: 8767
                         Depression with no Internet addiction (N=6100)
                        Depression with internet addiction (N=3470)
                                                   Total: 9570

    In the same way it goes when I compare to other variables, e.g. depression,self efficacy etc., (the number of participants in each case is different) and when I apply the Kruskal Wallis test.

    Is this something normal, is this just missing items or something else went wrong?

    Your help is much appreciated!

    All the best

    #SPSSStatistics


  • 2.  RE: Mann Whitney test question

    Posted Tue February 08, 2022 02:08 PM
    Sandy;

    Sounds like missing values to me.

    Note that for all NPAR TESTS, missing data have these options:

    • ANALYSIS. Exclude cases with missing values on a test-by-test basis. Cases with missing values for a variable that is used for a specific test are omitted from that test. On subcommands that specify several tests, each test is evaluated separately. This setting is the default.

    • LISTWISE. Exclude cases with missing values listwise. Cases with missing values for any variable that is named on any subcommand are excluded from all analyses.

    • INCLUDE. Include user-missing values. User-missing values are treated as valid values.


    ------------------------------
    Rick Marcantonio
    Quality Assurance
    IBM
    ------------------------------

    Original Message


  • 3.  RE: Mann Whitney test question

    Posted Fri February 11, 2022 02:47 AM
    Dear Rick Marcantonio,

    Thanks a lot for your help.

    Your advice was really helpful!



    Στις Τρί 8 Φεβ 2022 στις 9:10 μ.μ., ο/η Rick Marcantonio via IBM Community <Mail@connectedcommunity.org> έγραψε:
    Sandy; Sounds like missing values to me. Note that for all NPAR TESTS, missing data have these options: ANALYSIS. Exclude cases with... -posted to the "SPSS Statistics" group
    IBM Community

    SPSS Statistics

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    Re: Mann Whitney test question
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    Rick Marcantonio
    Feb 8, 2022 2:08 PM
    Rick Marcantonio
    Sandy;

    Sounds like missing values to me.

    Note that for all NPAR TESTS, missing data have these options:

    • ANALYSIS. Exclude cases with missing values on a test-by-test basis. Cases with missing values for a variable that is used for a specific test are omitted from that test. On subcommands that specify several tests, each test is evaluated separately. This setting is the default.

    • LISTWISE. Exclude cases with missing values listwise. Cases with missing values for any variable that is named on any subcommand are excluded from all analyses.

    • INCLUDE. Include user-missing values. User-missing values are treated as valid values.


    ------------------------------
    Rick Marcantonio
    Quality Assurance
    IBM
    ------------------------------
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    Original Message:
    Sent: 2/8/2022 2:08:00 PM
    From: Rick Marcantonio
    Subject: RE: Mann Whitney test question

    Sandy;

    Sounds like missing values to me.

    Note that for all NPAR TESTS, missing data have these options:

    • ANALYSIS. Exclude cases with missing values on a test-by-test basis. Cases with missing values for a variable that is used for a specific test are omitted from that test. On subcommands that specify several tests, each test is evaluated separately. This setting is the default.

    • LISTWISE. Exclude cases with missing values listwise. Cases with missing values for any variable that is named on any subcommand are excluded from all analyses.

    • INCLUDE. Include user-missing values. User-missing values are treated as valid values.


    ------------------------------
    Rick Marcantonio
    Quality Assurance
    IBM
    ------------------------------


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