Re: trend signif

From: Dennis Shea (shea AT cgd.ucar.edu)
Date: Tue May 24 2005 - 13:36:43 MDT

  • Next message: Mike Notaro: "trend signif"

    >Hello. Is there an NCL function or script available for testing the
    >significance of a trend (example, 100 years of global av temperature)?

    Hi Mike,

    Not sure what you used to calculate the trend.
    However, regline
        http://www.ncl.ucar.edu/Document/Functions/Built-in/regline.shtml
    and, regcoef
        http://www.ncl.ucar.edu/Document/Functions/Built-in/regcoef.shtml
        
        return the t-statistic [tval] as an attribute.
        The number of values used (N) is also returned. These
        can be used to evaluate the statistical significance.
        
        Note: If a N are independent then use (N-2) dof.

    HTH
        
    D

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