On Mon, Jun 10, 2013 at 9:13 PM, Philipp Kraus <philipp.kraus@flashpixx.de> wrote:

On 2013-06-10 20:58:40 +0200, sguazt said:

On Mon, Jun 10, 2013 at 4:22 PM, Philipp Kraus <philipp.kraus@flashpixx.de> 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#accumulators.user_s_guide.the_statistical_accumulators_library.p_square_quantile

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<double, boost::accumulators::stats<
                   boost::accumulators::tag::count,
                   boost::accumulators::tag::sum,
                   boost::accumulators::tag::median,
                   boost::accumulators::tag::mean,
                   boost::accumulators::tag::variance,
                   boost::accumulators::tag::min,
                   boost::accumulators::tag::max,
                   boost::accumulators::tag::p_square_quantile
               > > 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?