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-rw-r--r--src/statistical.h19
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diff --git a/src/statistical.h b/src/statistical.h
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+#ifndef NETDATA_STATISTICAL_H
+#define NETDATA_STATISTICAL_H
+
+extern long double average(long double *series, size_t entries);
+extern long double moving_average(long double *series, size_t entries, size_t period);
+extern long double median(long double *series, size_t entries);
+extern long double moving_median(long double *series, size_t entries, size_t period);
+extern long double running_median_estimate(long double *series, size_t entries);
+extern long double standard_deviation(long double *series, size_t entries);
+extern long double single_exponential_smoothing(long double *series, size_t entries, long double alpha);
+extern long double double_exponential_smoothing(long double *series, size_t entries, long double alpha, long double beta, long double *forecast);
+extern long double holtwinters(long double *series, size_t entries, long double alpha, long double beta, long double gamma, long double *forecast);
+extern long double sum_and_count(long double *series, size_t entries, size_t *count);
+extern long double sum(long double *series, size_t entries);
+extern long double median_on_sorted_series(long double *series, size_t entries);
+extern long double *copy_series(long double *series, size_t entries);
+extern void sort_series(long double *series, size_t entries);
+
+#endif //NETDATA_STATISTICAL_H