SAS Note V6-NEURAL-G772

From: tsdlist@UNX.SAS.COM
Date: Mon Jun 12 2000 - 14:15:20 EDT

  • Next message: tsdlist@UNX.SAS.COM: "Version 8, Release 8.1 TSLEVEL 1M0 now available"

    >>>>>>>> SAS Notes -- Copyright (c) 1991 - 2000 by SAS Institute Inc. <<<<<<<<

    V6-NEURAL-G772 *** ALERT NOTE *** PRODUCT: ENT MINER
                                                            PROCUDURE:NEURAL

    TITLE: Enterprise Miner Neural Network Fit Statistics May Be Incorrect

    KEYS: NEURAL NETWORK FIT STATISTICS INCORRECT RESULTS DENOMINATOR SAMPLE
           AVERAGE PROFIT ERROR DF DEGREES OF FREEDOM AIC SBC INCORROUT

        The Neural Network Node is not using observations with missing values
        for any of the input variables in the computation of fit statistics,
        as other nodes are. Therefore, the fit statistics from neural network
        models SHOULD NOT be compared with the fit statistics from other
        modeling nodes, if there are missing values for any of the input
        variables. Also, neural network models should not be compared with
        other neural network models based on different sets of inputs with
        different patterns of missing values. Any such comparisons will produce
        erroneous results, since the nodes are essentially analyzing different
        data sets.

        If there are no missing values for any of the variables used in the
        analysis, comparing the fit statistics from neural network models with
        models from other modeling nodes is valid. Also, comparisons between
        different neural network models are valid, even with missing inputs, if
        they contain the same input (and target) variables.

    +------REPORTED------+ +---FIXED---+
    SYSTEM RELEASE LEVEL RELEASE LEVEL

    WIN/NT 2.0
    Win95 2.0
    AIX/R 2.01
    DigitUnx 2.01
    HP800 2.01
    Solaris 2.01
    WIN/NT 2.01
    Win95 2.01
    AIX/R 2.02
    DigitUnx 2.02
    HP800 2.02
    Solaris 2.02
    WIN/NT 2.02
    Win95 2.02
    AIX/R 2.03
    DigitUnx 2.03
    HP800 2.03
    Solaris 2.03
    WIN/NT 2.03
    Win95 2.03
    AIX/R 3.0
    DigitUnx 3.0
    HP800 3.0
    Solaris 3.0
    WIN/NT 3.0
    Win98 3.0
    Win95 3.0
    AIX/R 3.01
    DigitUnx 3.01
    HP800 3.01
    Solaris 3.01
    WIN/NT 3.01
    Win98 3.01
    Win95 3.01



    This archive was generated by hypermail 2b29 : Mon Jun 12 2000 - 14:40:33 EDT