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ZScoreCalculator.h
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1//# Copyright (C) 2000,2001
2//# Associated Universities, Inc. Washington DC, USA.
3//#
4//# This library is free software; you can redistribute it and/or modify it
5//# under the terms of the GNU Library General Public License as published by
6//# the Free Software Foundation; either version 2 of the License, or (at your
7//# option) any later version.
8//#
9//# This library is distributed in the hope that it will be useful, but WITHOUT
10//# ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11//# FITNESS FOR A PARTICULAR PURPOSE. See the GNU Library General Public
12//# License for more details.
13//#
14//# You should have received a copy of the GNU Library General Public License
15//# along with this library; if not, write to the Free Software Foundation,
16//# Inc., 675 Massachusetts Ave, Cambridge, MA 02139, USA.
17//#
18//# Correspondence concerning AIPS++ should be addressed as follows:
19//# Internet email: aips2-request@nrao.edu.
20//# Postal address: AIPS++ Project Office
21//# National Radio Astronomy Observatory
22//# 520 Edgemont Road
23//# Charlottesville, VA 22903-2475 USA
24//#
25//# $Id: HostInfoDarwin.h 21521 2014-12-10 08:06:42Z gervandiepen $
26
27#ifndef SCIMATH_ZSCORECALCULATOR_H
28#define SCIMATH_ZSCORECALCULATOR_H
29
30#include <casacore/casa/aips.h>
31
32#include <cmath>
33#include <map>
34#include <mutex>
35#include <set>
36
37namespace casacore {
38
39class Mutex;
40
41// This class contains static methods related to z-scores. A z-score is the
42// number of standard deviations from the mean in a normal distribution.
43
45public:
46
47 ZScoreCalculator() = delete;
48
49 // compute the maximum expected zscore given the number of points
50 // in a sample.
52
53 // Get the minimum number of points in a Gaussian distribution, such that
54 // the probability that the maximum of the distribution having the specified
55 // zscore is 0.5. <src>zscore</src> should be non-negative.
56 static inline uInt64 zscoreToNpts(Double zscore) {
57 return (uInt64)(0.5/erfc(zscore/sqrt(2)));
58 }
59
60private:
61 static std::map<uInt64, Double> _nptsToMaxZScore;
62 static std::mutex _mutex;
63
64};
65
66}
67
68#endif
This class contains static methods related to z-scores.
static uInt64 zscoreToNpts(Double zscore)
Get the minimum number of points in a Gaussian distribution, such that the probability that the maxim...
static std::map< uInt64, Double > _nptsToMaxZScore
static Double getMaxZScore(uInt64 npts)
compute the maximum expected zscore given the number of points in a sample.
this file contains all the compiler specific defines
Definition mainpage.dox:28
LatticeExprNode sqrt(const LatticeExprNode &expr)
double Double
Definition aipstype.h:55
unsigned long long uInt64
Definition aipsxtype.h:39