20 lines
556 B
TypeScript
20 lines
556 B
TypeScript
import pl from "npm:nodejs-polars";
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export function residuals(x: pl.Expr, y: pl.Expr): pl.Expr {
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const xM = x.minus(x.mean());
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const yM = y.minus(y.mean());
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const xMSQ = xM.pow(2);
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const beta = xM.dot(yM).div(xMSQ.sum());
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return yM.minus(beta.mul(xM));
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}
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export const fillzero = (
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value = 0.0001,
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) => (pl.all().replaceStrict(0, value, pl.all()));
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export const minmaxScale = (col: pl.Expr) =>
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(col.minus(col.min())).div(col.max().minus(col.min()));
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export const standardScale = (col: pl.Expr) =>
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(col.minus(col.mean())).div(col.std());
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