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Re: Equivalent of EXCEL LINEST function? [message #24775]

Mon, 23 April 2001 13:09

Bruce Bowler
Messages: 128
Registered: September 1998

Senior Member

Craig Markwardt wrote:
> However using REGRESS may be like killing a fly with a shotgun, a bit
> of overkill.
>
> Why not use LINFIT and CORRELATE, which standard IDL functions?
>
> p = linfit(x,y, sigma=dp) ;; DP are parameter uncertainties
> r2 = correlate(x,y)

Jeopardy style answer...

what is "because the IDL documentation stinks?"

I wanted to regress 2 vectors so I go into the online help in 5.3 (which
is what I'm using) and type regress. Up pops the REGRESS function. No
where does the REGRESS help mention LINFIT or CORRELATE.

After "rolling my own", I find them and they do (almost) what I want.
They don't (like LINEST in excel, or "my own") provide standard errors
of the coefficents, the constant and Y estimate and a few other little
bits.

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[Message index]

		Re: Equivalent of EXCEL LINEST function? By: Bruce Bowler on Mon, 23 April 2001 13:09
		Re: Equivalent of EXCEL LINEST function? By: Craig Markwardt on Fri, 20 April 2001 17:30
		Re: Equivalent of EXCEL LINEST function? By: Bruce Bowler on Fri, 20 April 2001 11:05
		Re: Equivalent of EXCEL LINEST function? By: Med Bennett on Thu, 19 April 2001 12:16
		Re: Equivalent of EXCEL LINEST function? By: Craig Markwardt on Mon, 23 April 2001 13:46

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