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PM58893: MERSENNE TWISTER GIVES INCORRECT SEED NUMBER ON CROSSTABS FOOTNOTE FOR MONTE CARLO EXACT TEST ON WINDOWS 7 64 BIT

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APAR status

  • Closed as program error.

Error description

  • You work with IBM SPSS Statistics 20 on a Windows 7 64 bit
    operating system.
    You create a crosstab with Chi Square test and Monte Carlo exact
    test. For the random number generation you have activated
    Mersenne Twister with:
    
    SET RNG=MT MTINDEX=2000000.
    
    However, on 64 bit OS the footnote you get on the Chi Square
    table is incorrect for the starting seed number. For example you
    get a value of 2673618506938605000:
    'b. Based on 10000 sampled tables with starting seed
    2673618506938605000'
    
    This is not an exact number because a seed number can be up to
    2000000000. This does not happen on a 32 bit machine.
    

Local fix

Problem summary

  • ****************************************************************
    * USERS AFFECTED:                                              *
    * Users working with Mersenne Twister for Exact Tests on 64    *
    * bit OS                                                       *
    ****************************************************************
    * PROBLEM DESCRIPTION:                                         *
    * You work with IBM SPSS Statistics 20 on a Windows 7 64 bit   *
    * operating system.                                            *
    * You create a crosstab with Chi Square test and Monte Carlo   *
    * exact                                                        *
    * test. For the random number generation you have activated    *
    * Mersenne Twister with:                                       *
    *                                                              *
    * SET RNG=MT MTINDEX=2000000.                                  *
    *                                                              *
    * However, on 64 bit OS the footnote you get on the Chi Square *
    * table is incorrect for the starting seed number. For example *
    * you                                                          *
    * get a value of 2673618506938605000:                          *
    * 'b. Based on 10000 sampled tables with starting seed         *
    * 2673618506938605000'                                         *
    *                                                              *
    * This is not an exact number because a seed number can be up  *
    * to                                                           *
    * 2000000000. This does not happen on a 32 bit machine.        *
    ****************************************************************
    * RECOMMENDATION:                                              *
    * This issue has been addressed in IBM SPSS Statistics Fixpack *
    * 2 (20.0.0.2)                                                 *
    ****************************************************************
    

Problem conclusion

  • This issue has been addressed in IBM SPSS Statistics Fixpack 2
    (20.0.0.2)
    

Temporary fix

Comments

APAR Information

  • APAR number

    PM58893

  • Reported component name

    SPSS STATISTICS

  • Reported component ID

    5725A54ST

  • Reported release

    K00

  • Status

    CLOSED PER

  • PE

    NoPE

  • HIPER

    NoHIPER

  • Special Attention

    NoSpecatt

  • Submitted date

    2012-02-23

  • Closed date

    2013-01-10

  • Last modified date

    2013-01-10

  • APAR is sysrouted FROM one or more of the following:

  • APAR is sysrouted TO one or more of the following:

Fix information

  • Fixed component name

    SPSS STATISTICS

  • Fixed component ID

    5725A54ST

Applicable component levels

  • RK00 PSN

       UP

  • RK00 PSY

       UP



Document information

More support for: SPSS Statistics
Statistics Desktop

Software version: 20.0

Reference #: PM58893

Modified date: 2013-01-10