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Re: Statistics::LineFit versus gnuplot, results differ

by sn1987a (Chaplain)
on Apr 25, 2014 at 19:04 UTC ( #1083838=note: print w/replies, xml ) Need Help??

in reply to Statistics::LineFit versus gnuplot, results differ

Using LibreOffice to graph the data as reported by your perl program and fit a line, I get the same result as the perl module.

I don't know enough Gnuplot to know what is going on there, but notice that the Asymptotic Standard Error is many times the values of the parameters. Event the perl data has a correlation coefficient of 0.02

You also have an error in the time conversion in the perl code.
return timelocal( '59', '59', '23', $d, $m, $y );
should be
return timelocal( '59', '59', '23', $d, $m-1, $y );.
This will not effect the slope, just the y-intercept.

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