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  • 1.  Normality Analysis

    Posted Tue September 16, 2025 05:59 AM

    Hello Community,

     

    I am using the Normality Analysis add-on from the extension hub. I am using a small file (N~26600) to test the normality of 2 variables.

     

    The procedure eventually wrote an output after 11:47 minutes (as declared by the notes).

     

    Has anybody had a similar experience?

     

    Meni Berger |

    Data Scientist and Head of Tech  Support

     

     

     



  • 2.  RE: Normality Analysis

    Posted Tue September 16, 2025 10:15 AM

    The execution time will depend on which tests are chosen.  A few, in fact, have explicit limits on sample size allowed, but those would issue an error message and stop.

    I ran a test with just Anderson-Darling, which is the default univariate, and 26600 cases, and it completed in one minute.  Then I ran a test with all the allowed univariate (excluding Shapiro-Wilk) and several multivariate tests, and that took much longer.  The test tables appeared in about 4.5 minutes, but there was a problem with the plots (boxplot, histograms, qq and splom).  I will investigate that.

    You should be using the updated version of the command, which is what you would have if you installed it recently, as the original version was broken by changes made by the author of the original underlying R module.



    ------------------------------
    Jon Peck
    Data Scientist
    JKP Associates
    Santa Fe
    ------------------------------



  • 3.  RE: Normality Analysis

    Posted Tue September 16, 2025 10:52 AM

    I have discovered that the Shapiro-Francia test has an undocumented limit of 5000 cases.  I have added a guard on that to the NORMALITY ANALYSIS procedure.  If I remove that from the univariate tests list, everything works and completes in 4.5 minutes.



    ------------------------------
    Jon Peck
    Data Scientist
    JKP Associates
    Santa Fe
    ------------------------------



  • 4.  RE: Normality Analysis

    Posted Thu September 18, 2025 09:35 AM

    I ran Normality on a smaller dataset with a better response time, although I now have a whole other issue. Each time I tick a new test on the 'Tests and plots' tab >> 'Multivariate Tests' (like Marida for example) and then click OK, SPSS crashes with the following error message.

     

     

    I need to end the task via Windows Task Manager. After restarting SPSS, I can run the test again with no issues.

     

              

    Meni Berger |

    Data Scientist and Head of Tech  Support

    Email  -  Meni@genius.co.il

    11 Menachem Begin st.,  Ramat Gan

    www.genius.co.il

    Click here to open a support ticket  

    Title: LinkedIn - Description: image of LinkedIn icon

     

     






  • 5.  RE: Normality Analysis

    Posted Thu September 18, 2025 09:38 AM
    Can you send me datacand syntax?  What version of SPSS are you on?






  • 6.  RE: Normality Analysis

    Posted Thu September 18, 2025 09:44 AM

    I am using Stats V. 31.0.

    Sending files to your Gmail.



    ------------------------------
    Meni Berger
    ------------------------------