TREND

Purpose:

Fits a line to a series.

TREND(series)

series

A series.

A series.

W1: integ(gnorm(1000,1))

W2: trend(W1);overp(W1, lred)

W2 contains the least squares best linear fit of the data. The resulting line is plotted with the original data.

W3: xy(W1, deriv(W1))

W4: trend(W3);overp(W3, lred)

W4 contains the best linear fit to the XY data in W3.

(fit, coeff) = trend(s) returns both the resulting fit and the linear coefficients {a0, a1} of the equation

$image\trend01.gif$

See DETREND to remove a linear trend from a series.