Christine SINOQUET wrote:

Hello,

I have to implement chi square tests. As I already use the boost library boost_1_38 for other purposes, I would like to use it for this purpose too. However I can find no documentation relative to this or the information I find is not correct.

Can somebody indicate me how I can to use accumulators/statistics ? Is the boost_1_38 appropriate ? Which file should I include and which function should I use ?

I just need to specify the columns in a matrix I wish to test for independence, the data itself and a threshold alpha. I would like the test statistic in return, as well as the p-value.

If my question is not the object of this diffusion list, please tell me.

Thank you in advance.

Regards.

I tend to find Boost.Accumulators most useful when you want to compute a statistics in a sequential fashion say for n = 10, 20, 30. In your case, Boost.Accumulators would be useful to update a contingency table as observations are accumulated. The actual statistics would be in a separate "feature" that depends on the former (that's the beauty of Boost.Acc). You can find an example along those lines for the kolmogorov statistic: https://svn.boost.org/svn/boost/sandbox/statistics/non_parametric/boost/stat... If you already have a contingency table (as seems the case from your question) I can only suggest to compute the statistics (std::accumulate?) and and compare it to its critical value using http://www.boost.org/doc/libs/1_40_0/libs/math/doc/sf_and_dist/html/math_too... HTH, but if it's too trivial, better safe than sorry.

-----Original Message----- From: boost-users-bounces@lists.boost.org [mailto:boost-users-bounces@lists.boost.org] On Behalf Of Christine SINOQUET Sent: Tuesday, March 30, 2010 2:53 PM To: boost-users@lists.boost.org Subject: [Boost-users] [statistics] chi-square test with boost

I have to implement chi square tests. As I already use the boost library boost_1_38 for other purposes, I would like to use it for this purpose too. However I can find no documentation relative to this or the information I find is not correct.

(If you download the latest version 1_42) You will find some code to calculate and use many statistical distributions documented at http://www.boost.org/doc/libs/1_42_0/libs/math/doc/sf_and_dist/html/index.ht... It includes several fully worked and documented examples of using the chi_sqr distribution, and links to the source code.

Can somebody indicate me how I can to use accumulators/statistics ?

How you do this using the accumulator library, I am not qualified to advise. HTH Paul --- Paul A. Bristow Prizet Farmhouse Kendal, UK LA8 8AB +44 1539 561830, mobile +44 7714330204 pbristow@hetp.u-net.com