Chi-square distribution plot

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Kash022
Kash022 2017-7-3
回答： dpb 2017-7-3
Hi All,
I want to plot the chi square distribution which I have computed. I have the below code which returns me the parameters but am unable to plot the distribution.
[h,p,st]= chi2gof(Id,'NBins',nBins,'Alpha',0.05)
h =
0
p =
0.2530
st =
chi2stat: 129.9011
df: 120
edges: [1x124 double]
O: [1x123 double]
E: [1x123 double]
Id is 1x2000 vector. nBins for me ~278. Please let me know how to plot the distribution. Thanks a lot!!

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回答（1 个）

dpb
dpb 2017-7-3
Because chi2gof returns bin edges, need to convert to centers --
x=filter([0.5 0.5],1,st.edges); x=x(2:end); % average successive edges for centers
bar(x,[st.O;st.E]','grouped') % put the two groups together for bar
legend('Observed','Expected') % tell who's who...

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