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

Subscribe to this APAR

By subscribing, you receive periodic emails alerting you to the status of the APAR, along with a link to the fix after it becomes available. You can track this item individually or track all items by product.

Notify me when this APAR changes.

Notify me when an APAR for this component changes.

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



Rate this page:

(0 users)Average rating

Add comments

Document information


More support for:

SPSS Statistics
Statistics Desktop

Software version:

20.0

Reference #:

PM58893

Modified date:

2013-01-10

Translate my page

Machine Translation

Content navigation