On 2013-06-11 10:33:14 +0200, sguazt said:
On Mon, Jun 10, 2013 at 10:56 PM, Philipp Kraus <philipp.kraus@flashpixx.de> wrote:
On 2013-06-10 21:44:21 +0200, sguazt said:
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?
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?
You can use the extended_p_square_quantile ;)
See the example here:
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<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::extended_p_square
> > 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 T, long unsigned int N> 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.
I think the error refers to boost::array which needs an additional parameter representing the (fixed) sized of the array.
Also, you can replace tag::median with the calculation of 0.50th quantile:
using namespace boost::accumulators;
typedef accumulator_set<double,
stats<tag::count,
tag::sum,
tag::mean,
tag::extended_p_square_quantile> > accumulator_t;
int main()
{
boost::array<double,3> probs = {0.25, 0.50, 0.75};
accumulator_t acc(extended_p_square_probabilities = probs);
}
I got compilation errors if I add tag::variance, tag::min and tag::max.
Unfortunately, I don't know how to solve it. Sorry
In the meanwhile, you can always keep two separate accumulators.
I try this with boost 1.53, f I try to create my accumulator with (disable all except the quantil) and call
boost::array<double, 3> probs = {0.25, 0.5, 0.75};
m_times[p_name] = Accumulator( boost::accumulators::extended_p_square_probabilities = probs );
I got
/Developer/opt/Boost/1.53.0/include/boost/accumulators/statistics/extended_p_square.hpp:91: error: no match for 'operator[]' in 'args[boost::accumulators::<unnamed>::extended_p_square_probabilities]'
/Developer/opt/Boost/1.53.0/include/boost/parameter/aux_/arg_list.hpp:346: note: candidates are: typename boost::mpl::eval_if<typename boost::parameter::aux::is_maybe<typename TaggedArg::value_type>::type, boost::parameter::aux::get_reference<typename TaggedArg::value_type>, boost::parameter::aux::get_reference<TaggedArg> >::type boost::parameter::aux::arg_list<TaggedArg, Next>::operator[](const boost::parameter::keyword<typename TaggedArg::key_type>&) const [with TaggedArg = boost::parameter::aux::tagged_argument<boost::accumulators::tag::accumulator, boost::accumulators::accumulator_set<double, boost::accumulators::stats<boost::accumulators::tag::count, boost::accumulators::tag::extended_p_square, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na>, void> >, Next = boost::parameter::aux::empty_arg_list]
Phil