Re: [Boost-users] accumulator extended quantil value

Subject: Re: [Boost-users] accumulator extended quantil value
From: Eric Niebler (eniebler_at_[hidden])
Date: 2013-06-17 15:24:35

On 6/16/2013 7:28 PM, Philipp Kraus wrote:
> On 2013-06-14 17:24:40 +0200, Philipp Kraus said:
> 
> Hello,
> 
> I have got created an extended_p_square_quantile into an accumulator,
> with 3 quantils (0.25, 0.5, 0.75) as a boost::array.
> 
> How can I get access to the quantil values of the accumulator? For the
> variance I use accumulator::variance(myacc), but a call with
> 
> quantil(myacc, 0.5) does not work. 
> 
> 
> I use for reading the quantil value
> 
> namespace bac = boost::accumulator
> bac::quantil( myvar, bac::quantile_probability = 0.5)

It's spelled "quantile".

> but the value is very different of the median. If I run median & 0.5
> quantil, the median results eg 930.67932 and the quantil
> 
> value is 0. So I can not explain this large difference. My accumulator
> uses median & 0.5 quantil, so the accumulator
> 
> is used equal data.
> 
> Can anybody help me please to fix this problem?

Maybe Matthias Troyer will chime in.

-- 
Eric Niebler
Boost.org
http://www.boost.org