URL:
<https://savannah.gnu.org/bugs/?58202>
Summary: Wrong Result Median for gsl_rstat_quantile_get with
fix
Project: GNU Scientific Library
Submitted by: joscao
Submitted on: Sat 18 Apr 2020 06:26:00 PM UTC
Category: Documentation
Severity: 3 - Normal
Operating System: Ubuntu 18.04.4 LTS
Status: None
Assigned to: None
Open/Closed: Open
Release: 12.6
Discussion Lock: Any
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Details:
In: rquantile.c
double gsl_rstat_quantile_get(gsl_rstat_quantile_workspace *w)
Check against w->n >= 5, should be check against w->n > 5.
Because first time sorting of underlying data in:
int gsl_rstat_quantile_add(const double x, gsl_rstat_quantile_workspace *w)
happens when n turns 6 and not when n turns 5.
Has slipped through test in Documentation 22.5 Examples.
Median of dataset
{
17.2, 18.1, 16.5, 18.3, 12.6 = dataset
12.6, 16.5, 17.2, 18.1, 18.3 = ordered dataset
}
is equal to 17.2 NOT 16.5 as in Documentation.
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