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linreg - linear regression: all six methods
void linreg(n,x,y,a,siga,b,sigb)int n;double x[n], y[n];double a[6], siga[6],
b[6], sigb[6];
linreg computes the slope (a) and intercept coefficients
(b) for for OLS(Y/X) (1), OLS(X/Y) (2), OLS bisector(3)
, orthogonal(4)
,
reduced major axis (5)
and mean OLS (6)
methods. The dispersions are returned
in the arrays siga and sigb.
The dispersions for OLS are the general form
provided by T. Isobe, E. D. Feigelson, M. G. Akritas and G. J. Babu, Ap.J. 364,
104.
mean OLS is 0.5*[OLS(X/Y) + OLS(Y/X)]
~/src/kernel/math linreg.c
T. Isobe (fortran), P. Teuben(C)
linreg(1NEMO)
, tablsqfit(1NEMO)
,
gaussfit(1NEMO)
xx-jul-90 Created Isobe
13-aug-90 Ported into NEMO PJT
28-oct-90 upgraded from Feigelstein’s official rel. 1.0 PJT
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