Re: [Boost-users] quantil

On 2013-06-10 21:44:21 +0200, sguazt said:

On Mon, Jun 10, 2013 at 9:13 PM, Philipp Kraus wrote: On 2013-06-10 20:58:40 +0200, sguazt said:

On Mon, Jun 10, 2013 at 4:22 PM, Philipp Kraus wrote: Hello,

I would like to create a box plot and use the static calls of the boost. Median / average etc works well, but I need also the 25% & 75% quantil of my data, I'm using a boost::accumulators::accumulator_set for calculating statistical data. Can I / How can I use this for the quantil calculation or should I do this myself?

Thanks

Phil

Hi,

Have you tried p_square_quantile from boost::accumulator?

http://www.boost.org/doc/libs/1_53_0/doc/html/accumulators/user_s_guide.html...

It uses a well-known algorithm to incrementally compute quantile estimation.

Great thanks, I don't see this section. But another question: I have defined my accumulator like                typedef boost::accumulators::accumulator_set > Accumulator;

Within the example the quantil value is set in the Ctor of the accumulator. In my case I need two quantiles 0.25 & 0.75 so I need two p_square_quantile parts in my accu, so how I can add the two quantils and how I can set it to the values?

You can use the extended_p_square_quantile ;)

See the example here:

http://www.boost.org/doc/libs/1_53_0/doc/html/accumulators/user_s_guide.html...

Thanks, but I can not create a working example and I can not compile the example code on the page. I have set up my typedef to: typedef boost::accumulators::accumulator_set > Accumulator; and try to create the ctor call with boost::array<double> probs = {0.25, 0.75}; x = Accumulator( boost::accumulators::tag::extended_p_square::probabilities = probs ); I get the error: error: wrong number of template arguments (1, should be 2) /Boost/1.53.0/include/boost/fusion/support/tag_of.hpp:24: error: provided for 'template class boost::array' error: invalid type in declaration before '=' token error: scalar object 'probs' requires one element in initializer I don't see my mistake at the moment. Thanks a lot for your help, this calls seems to be the correct parameter for creating the whisker on a box plot. Phil