52 lines
1.2 KiB
Go
52 lines
1.2 KiB
Go
// Copyright © 2016 Abcum Ltd
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package math
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import "math"
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func Quartile(vals []float64) (float64, float64, float64) {
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if len(vals) == 0 {
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return math.NaN(), math.NaN(), math.NaN()
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}
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l := len(vals)
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switch {
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case l%2 == 0:
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c1 := l / 2
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c2 := l / 2
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sort := Sort(vals)
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return Median(sort[:c1]), Median(sort), Median(sort[c2:])
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default:
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c1 := (l - 1) / 2
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c2 := c1 + 1
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sort := Sort(vals)
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return Median(sort[:c1]), Median(sort), Median(sort[c2:])
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}
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}
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func InterQuartileRange(vals []float64) float64 {
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if len(vals) == 0 {
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return math.NaN()
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}
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q1, _, q3 := Quartile(vals)
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return q3 - q1
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}
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