Why histfit cannot fit my data very well?

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Shane Lin
Shane Lin 2013-1-5
I tried to fit the histogram as shown in the fig. I tried normal distribution and gamma fitting (preferred) with histfit. but histfit cannot fit the data very well. Any suggestion? http://www.imagesup.net/?di=0135735909615

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回答（2 个）

Walter Roberson
Walter Roberson 2013-1-5
Have you considered the possibility that the data does not fit those distributions well enough for you to be comfortable? Have you considered trying
ttest(x, mean(x))
to find the confidence that the data is normally distributed?
Tom Lane
Tom Lane 2013-1-7
Try fitting the 'gev' (generalized extreme value) or 'tlocationscale" (location/scale shift of the t) distribution.

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