1 //===----------------------------------------------------------------------===//
3 // The LLVM Compiler Infrastructure
5 // This file is dual licensed under the MIT and the University of Illinois Open
6 // Source Licenses. See LICENSE.TXT for details.
8 //===----------------------------------------------------------------------===//
10 // REQUIRES: long_tests
14 // template<class IntType = int>
15 // class negative_binomial_distribution
17 // template<class _URNG> result_type operator()(_URNG& g);
35 typedef std::negative_binomial_distribution<> D;
36 typedef std::minstd_rand G;
39 const int N = 1000000;
40 std::vector<D::result_type> u;
41 for (int i = 0; i < N; ++i)
43 D::result_type v = d(g);
44 assert(d.min() <= v && v <= d.max());
47 double mean = std::accumulate(u.begin(), u.end(),
48 double(0)) / u.size();
52 for (unsigned i = 0; i < u.size(); ++i)
54 double dbl = (u[i] - mean);
61 double dev = std::sqrt(var);
62 skew /= u.size() * dev * var;
63 kurtosis /= u.size() * var * var;
65 double x_mean = d.k() * (1 - d.p()) / d.p();
66 double x_var = x_mean / d.p();
67 double x_skew = (2 - d.p()) / std::sqrt(d.k() * (1 - d.p()));
68 double x_kurtosis = 6. / d.k() + sqr(d.p()) / (d.k() * (1 - d.p()));
69 assert(std::abs((mean - x_mean) / x_mean) < 0.01);
70 assert(std::abs((var - x_var) / x_var) < 0.01);
71 assert(std::abs((skew - x_skew) / x_skew) < 0.01);
72 assert(std::abs((kurtosis - x_kurtosis) / x_kurtosis) < 0.02);
78 typedef std::negative_binomial_distribution<> D;
79 typedef std::mt19937 G;
82 const int N = 1000000;
83 std::vector<D::result_type> u;
84 for (int i = 0; i < N; ++i)
86 D::result_type v = d(g);
87 assert(d.min() <= v && v <= d.max());
90 double mean = std::accumulate(u.begin(), u.end(),
91 double(0)) / u.size();
95 for (unsigned i = 0; i < u.size(); ++i)
97 double dbl = (u[i] - mean);
104 double dev = std::sqrt(var);
105 skew /= u.size() * dev * var;
106 kurtosis /= u.size() * var * var;
108 double x_mean = d.k() * (1 - d.p()) / d.p();
109 double x_var = x_mean / d.p();
110 double x_skew = (2 - d.p()) / std::sqrt(d.k() * (1 - d.p()));
111 double x_kurtosis = 6. / d.k() + sqr(d.p()) / (d.k() * (1 - d.p()));
112 assert(std::abs((mean - x_mean) / x_mean) < 0.01);
113 assert(std::abs((var - x_var) / x_var) < 0.01);
114 assert(std::abs((skew - x_skew) / x_skew) < 0.01);
115 assert(std::abs((kurtosis - x_kurtosis) / x_kurtosis) < 0.01);
121 typedef std::negative_binomial_distribution<> D;
122 typedef std::mt19937 G;
125 const int N = 1000000;
126 std::vector<D::result_type> u;
127 for (int i = 0; i < N; ++i)
129 D::result_type v = d(g);
130 assert(d.min() <= v && v <= d.max());
133 double mean = std::accumulate(u.begin(), u.end(),
134 double(0)) / u.size();
138 for (unsigned i = 0; i < u.size(); ++i)
140 double dbl = (u[i] - mean);
141 double d2 = sqr(dbl);
147 double dev = std::sqrt(var);
148 skew /= u.size() * dev * var;
149 kurtosis /= u.size() * var * var;
151 double x_mean = d.k() * (1 - d.p()) / d.p();
152 double x_var = x_mean / d.p();
153 double x_skew = (2 - d.p()) / std::sqrt(d.k() * (1 - d.p()));
154 double x_kurtosis = 6. / d.k() + sqr(d.p()) / (d.k() * (1 - d.p()));
155 assert(std::abs((mean - x_mean) / x_mean) < 0.01);
156 assert(std::abs((var - x_var) / x_var) < 0.01);
157 assert(std::abs((skew - x_skew) / x_skew) < 0.01);
158 assert(std::abs((kurtosis - x_kurtosis) / x_kurtosis) < 0.03);
164 typedef std::negative_binomial_distribution<> D;
165 typedef std::mt19937 G;
169 std::vector<D::result_type> u;
170 for (int i = 0; i < N; ++i)
172 D::result_type v = d(g);
173 assert(d.min() <= v && v <= d.max());
176 double mean = std::accumulate(u.begin(), u.end(),
177 double(0)) / u.size();
181 for (unsigned i = 0; i < u.size(); ++i)
183 double dbl = (u[i] - mean);
184 double d2 = sqr(dbl);
190 double dev = std::sqrt(var);
191 skew /= u.size() * dev * var;
192 kurtosis /= u.size() * var * var;
194 double x_mean = d.k() * (1 - d.p()) / d.p();
195 double x_var = x_mean / d.p();
196 // double x_skew = (2 - d.p()) / std::sqrt(d.k() * (1 - d.p()));
197 // double x_kurtosis = 6. / d.k() + sqr(d.p()) / (d.k() * (1 - d.p()));
198 assert(mean == x_mean);
199 assert(var == x_var);
205 typedef std::negative_binomial_distribution<> D;
206 typedef std::mt19937 G;
209 const int N = 1000000;
210 std::vector<D::result_type> u;
211 for (int i = 0; i < N; ++i)
213 D::result_type v = d(g);
214 assert(d.min() <= v && v <= d.max());
217 double mean = std::accumulate(u.begin(), u.end(),
218 double(0)) / u.size();
222 for (unsigned i = 0; i < u.size(); ++i)
224 double dbl = (u[i] - mean);
225 double d2 = sqr(dbl);
231 double dev = std::sqrt(var);
232 skew /= u.size() * dev * var;
233 kurtosis /= u.size() * var * var;
235 double x_mean = d.k() * (1 - d.p()) / d.p();
236 double x_var = x_mean / d.p();
237 double x_skew = (2 - d.p()) / std::sqrt(d.k() * (1 - d.p()));
238 double x_kurtosis = 6. / d.k() + sqr(d.p()) / (d.k() * (1 - d.p()));
239 assert(std::abs((mean - x_mean) / x_mean) < 0.01);
240 assert(std::abs((var - x_var) / x_var) < 0.01);
241 assert(std::abs((skew - x_skew) / x_skew) < 0.04);
242 assert(std::abs((kurtosis - x_kurtosis) / x_kurtosis) < 0.05);
248 typedef std::negative_binomial_distribution<> D;
249 typedef std::mt19937 G;
252 const int N = 1000000;
253 std::vector<D::result_type> u;
254 for (int i = 0; i < N; ++i)
256 D::result_type v = d(g);
257 assert(d.min() <= v && v <= d.max());
260 double mean = std::accumulate(u.begin(), u.end(),
261 double(0)) / u.size();
265 for (unsigned i = 0; i < u.size(); ++i)
267 double dbl = (u[i] - mean);
268 double d2 = sqr(dbl);
274 double dev = std::sqrt(var);
275 skew /= u.size() * dev * var;
276 kurtosis /= u.size() * var * var;
278 double x_mean = d.k() * (1 - d.p()) / d.p();
279 double x_var = x_mean / d.p();
280 double x_skew = (2 - d.p()) / std::sqrt(d.k() * (1 - d.p()));
281 double x_kurtosis = 6. / d.k() + sqr(d.p()) / (d.k() * (1 - d.p()));
282 assert(std::abs((mean - x_mean) / x_mean) < 0.01);
283 assert(std::abs((var - x_var) / x_var) < 0.01);
284 assert(std::abs((skew - x_skew) / x_skew) < 0.01);
285 assert(std::abs((kurtosis - x_kurtosis) / x_kurtosis) < 0.03);