Adding dep files and dependencies.

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

@@ -0,0 +1,74 @@
+package stats
+
+import "math"
+
+// Quartiles holds the three quartile points
+type Quartiles struct {
+	Q1 float64
+	Q2 float64
+	Q3 float64
+}
+
+// Quartile returns the three quartile points from a slice of data
+func Quartile(input Float64Data) (Quartiles, error) {
+
+	il := input.Len()
+	if il == 0 {
+		return Quartiles{}, EmptyInput
+	}
+
+	// Start by sorting a copy of the slice
+	copy := sortedCopy(input)
+
+	// Find the cutoff places depeding on if
+	// the input slice length is even or odd
+	var c1 int
+	var c2 int
+	if il%2 == 0 {
+		c1 = il / 2
+		c2 = il / 2
+	} else {
+		c1 = (il - 1) / 2
+		c2 = c1 + 1
+	}
+
+	// Find the Medians with the cutoff points
+	Q1, _ := Median(copy[:c1])
+	Q2, _ := Median(copy)
+	Q3, _ := Median(copy[c2:])
+
+	return Quartiles{Q1, Q2, Q3}, nil
+
+}
+
+// InterQuartileRange finds the range between Q1 and Q3
+func InterQuartileRange(input Float64Data) (float64, error) {
+	if input.Len() == 0 {
+		return math.NaN(), EmptyInput
+	}
+	qs, _ := Quartile(input)
+	iqr := qs.Q3 - qs.Q1
+	return iqr, nil
+}
+
+// Midhinge finds the average of the first and third quartiles
+func Midhinge(input Float64Data) (float64, error) {
+	if input.Len() == 0 {
+		return math.NaN(), EmptyInput
+	}
+	qs, _ := Quartile(input)
+	mh := (qs.Q1 + qs.Q3) / 2
+	return mh, nil
+}
+
+// Trimean finds the average of the median and the midhinge
+func Trimean(input Float64Data) (float64, error) {
+	if input.Len() == 0 {
+		return math.NaN(), EmptyInput
+	}
+
+	c := sortedCopy(input)
+	q, _ := Quartile(c)
+
+	return (q.Q1 + (q.Q2 * 2) + q.Q3) / 4, nil
+}