Adding dep files and dependencies.

vendor/github.com/montanaflynn/stats/mean.go

@@ -0,0 +1,60 @@
+package stats
+
+import "math"
+
+// Mean gets the average of a slice of numbers
+func Mean(input Float64Data) (float64, error) {
+
+	if input.Len() == 0 {
+		return math.NaN(), EmptyInput
+	}
+
+	sum, _ := input.Sum()
+
+	return sum / float64(input.Len()), nil
+}
+
+// GeometricMean gets the geometric mean for a slice of numbers
+func GeometricMean(input Float64Data) (float64, error) {
+
+	l := input.Len()
+	if l == 0 {
+		return math.NaN(), EmptyInput
+	}
+
+	// Get the product of all the numbers
+	var p float64
+	for _, n := range input {
+		if p == 0 {
+			p = n
+		} else {
+			p *= n
+		}
+	}
+
+	// Calculate the geometric mean
+	return math.Pow(p, 1/float64(l)), nil
+}
+
+// HarmonicMean gets the harmonic mean for a slice of numbers
+func HarmonicMean(input Float64Data) (float64, error) {
+
+	l := input.Len()
+	if l == 0 {
+		return math.NaN(), EmptyInput
+	}
+
+	// Get the sum of all the numbers reciprocals and return an
+	// error for values that cannot be included in harmonic mean
+	var p float64
+	for _, n := range input {
+		if n < 0 {
+			return math.NaN(), NegativeErr
+		} else if n == 0 {
+			return math.NaN(), ZeroErr
+		}
+		p += (1 / n)
+	}
+
+	return float64(l) / p, nil
+}