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Indicate goodness of fit of regression line

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The goodness of fit of a regression line is the percentage
of the variance of the y values that is explained by the
dependence on the x values.

Set the alpha value of the regression line to this goodness
of fit.

Further, set the width of the regression line to a standard
deviation of the values from the regression line valies.

Signed-off-by: Robert C. Helling <helling@atdotde.de>
This commit is contained in:
Robert C. Helling 2021-01-10 00:12:41 +01:00
parent 622e5aab69
commit d83c9b5246
2 changed files with 50 additions and 32 deletions
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8
stats/statsview.h
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@ -9,6 +9,7 @@
#include <QImage>
#include <QPainter>
#include <QQuickItem>
#include <QGraphicsPolygonItem>
struct dive;
struct StatsBinner;
@ -117,11 +118,12 @@ private:
// A regression line
struct RegressionLine {
std::unique_ptr<QGraphicsLineItem> item;
std::unique_ptr<QGraphicsPolygonItem> item;
StatsAxis *xAxis, *yAxis;
double a, b; // y = ax + b
double width;
void updatePosition();
RegressionLine(double a, double b, QPen pen, QGraphicsScene *scene, StatsAxis *xAxis, StatsAxis *yAxis);
RegressionLine(double a, double b, double width, QBrush brush, QGraphicsScene *scene, StatsAxis *xAxis, StatsAxis *yAxis);
};
// A line marking median or mean in histograms
@ -134,7 +136,7 @@ private:
HistogramMarker(double val, bool horizontal, QPen pen, QGraphicsScene *scene, StatsAxis *xAxis, StatsAxis *yAxis);
};
void addLinearRegression(double a, double b, double minX, double maxX, double minY, double maxY, StatsAxis *xAxis, StatsAxis *yAxis);
void addLinearRegression(double a, double b, double res2, double r2, double minX, double maxX, double minY, double maxY, StatsAxis *xAxis, StatsAxis *yAxis);
void addHistogramMarker(double pos, const QPen &pen, bool isHorizontal, StatsAxis *xAxis, StatsAxis *yAxis);
StatsState state;