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/* RCSid $Id$ */
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/*
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* Header file for linear regression calculation.
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*/
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#include "copyright.h"
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typedef struct {
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double xs, ys, xxs, yys, xys;
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int n;
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} LRSUM;
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typedef struct {
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double slope, intercept, correlation;
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} LRLIN;
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#define lrpoint(x,y,l) ((l)->xs+=(x),(l)->ys+=(y),(l)->xxs+=(x)*(x), \
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(l)->yys+=(y)*(y),(l)->xys+=(x)*(y),++(l)->n)
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#define lrxavg(l) ((l)->xs/(l)->n)
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#define lryavg(l) ((l)->ys/(l)->n)
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#define lrxvar(l) (((l)->xxs-(l)->xs*(l)->xs/(l)->n)/(l)->n)
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#define lryvar(l) (((l)->yys-(l)->ys*(l)->ys/(l)->n)/(l)->n)
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#define lrxdev(l) sqrt(((l)->xxs-(l)->xs*(l)->xs/(l)->n)/((l)->n-1))
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#define lrydev(l) sqrt(((l)->yys-(l)->ys*(l)->ys/(l)->n)/((l)->n-1))
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#ifdef NOPROTO
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extern void lrclear();
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extern int flrpoint();
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extern int lrfit();
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#else
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extern void lrclear(LRSUM *l);
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extern int flrpoint(double x, double y, LRSUM *l);
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extern int lrfit(LRLIN *r, LRSUM *l);
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#endif
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