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fix(stats): update min/max in computeStats to handle no outliers #853

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Oct 7, 2020
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fix(stats): update min/max in computeStats to handle no outliers #853

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53df3b1
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kanhegaonkarsaurabh Oct 7, 2020
def221f
fixed prettier issue and have only single quotes
kanhegaonkarsaurabh Oct 7, 2020
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8 changes: 6 additions & 2 deletions packages/visx-stats/src/util/computeStats.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -23,10 +23,14 @@ export default function computeStats(numericalArray: number[]) {
const thirdQuartile = calcMedian(upperHalf);
const IQR = thirdQuartile - firstQuartile;

const min = firstQuartile - 1.5 * IQR;
const max = thirdQuartile + 1.5 * IQR;
let min = firstQuartile - 1.5 * IQR;
let max = thirdQuartile + 1.5 * IQR;

const outliers = points.filter(p => p < min || p > max);
if (outliers.length === 0) {
min = Math.min(...points);
max = Math.max(...points);
}
const binWidth = 2 * IQR * (sampleSize - outliers.length) ** (-1 / 3);
const binCount = Math.round((max - min) / binWidth);
const actualBinWidth = (max - min) / binCount;
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6 changes: 6 additions & 0 deletions packages/visx-stats/test/computeStats.test.ts
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Expand Up @@ -19,4 +19,10 @@ describe('computeStats', () => {
expect(stats.boxPlot).toBeDefined();
expect(stats.binData).toBeDefined();
});

test('min/max should match the dataset when there are no outliers', () => {
const stats = computeStats(edgeCaseData);
expect(stats.boxPlot.min).toBe(Math.min(...edgeCaseData));
expect(stats.boxPlot.max).toBe(Math.max(...edgeCaseData));
});
});