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CHISQR_CVF question. [message #67654]

Wed, 19 August 2009 09:12

R.G. Stockwell
Messages: 363
Registered: July 1999

Senior Member

I'm just writing up a simple routine to calculate
significance levels for an FFT of a white spectrum.
I actually find the distribution of the spectrum, normalize
it with respect to N number of points and variation so I
always get the same distribution, and I am comparing it
to the CHISQR_CVF function (with 2 degrees of freedom, for a
power spectrum).

I am off by a constant factor (which depends on degrees of freedom)
but invariant to length of the time series, or the standard deviation
(since those are normalized out).

any ideas of what step i am missing here? I frankly can't think
of any other parameter involved here.

cheers,
bob

PS with degrees of freedom = 2, the constant factor is
10.914899

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