MATLAB: Results of bootci and bootstrp funciton don’t match.

statistics bootci

I tried bootci function, but got different result than if I use bootstrp function. For example, if I compute 5% confidence interval of varriance:
data=[1 2 4 9 16 25 36 49 64 81 100 121 144 169 196 225 256 289 324 361 400];
ci=bootsci(100000, @var, data);
gives values 10337 and 25885.
data=[1 2 4 9 16 25 36 49 64 81 100 121 144 169 196 225 256 289 324 361 400];
bootstat=bootstrp(100000, @var, data);
a=quantile(bootstat,0.025);
b=quantile(bootstat,0.975);
gives values 8107 and 23241, but I think that the results should be the same. Where make I mistake? Thank you.
Best regards Lukas

Best Answer

You will get a better match to your quantile results if you run
ci=bootci(1000, {@var, data}, 'type', 'per')
Take a look at the description of the 'type' parameter in the bootci doc or help.
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