tsa.stattools.acf confint needs checking and tests

Bug #668759 reported by joep
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This bug affects 1 person
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statsmodels
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Bug Description

the confint example in the file for tsa.stattools.acf didn't work, shape mismatch exception

I fixed the example how it looked right to me, but this needs verification, and it looks like there are no tests for it. Currently my branch only.

I didn't see that the standard errors/variance themselves are returned anywhere.

Maybe it would be better now to turn acf with statistics into a class, with lazily evaluated (cached attributes) instead of many options for various returns.

joep (josef-pktd)
Changed in statsmodels:
milestone: none → 0.3.0
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