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AIC, AICC NaN question

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    jackie
    Member

    Hi,
    I want to use AIC or AICC to evaluate fitting model. But when I run the following code in which sample is an array of sample data, I got NaN for AIC and AICC. Do you know what is the possible problem?
    Thanks,
    –Li

    ConditionalSumOfSquares fitting=new ConditionalSumOfSquares(sample, 1, 1, 1);
    ARIMAModel arima=fitting.getModel();

    System.out.println(“AIC:”+fitting.AIC());
    System.out.println(“AICC:”+fitting.AICC());

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