| 205 | } |
| 206 | |
| 207 | double mean(const std::vector<double> &x) { |
| 208 | double sum = 0; |
| 209 | for (const double &xi : x) { |
| 210 | sum += xi / static_cast<double>(x.size()); |
| 211 | } |
| 212 | return sum; |
| 213 | } |
| 214 | |
| 215 | double stddev(const std::vector<double> &x) { |
| 216 | double m = mean(x); |