Results of bootci and bootstrp funciton don't match.

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

Answer 1

[Ilya]

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.

[Lukas Pop]

Thanks for the answer.