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Plot proper confidence regions

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I was coninced that that rather than doing an order of
magnitude estimate of the confidence region it's better
to have the correct concave shapes that indicate the
95% confidence level for the regression line.

It also turned out that the previous expression was
missing a factor of 1/sqrt(n).

Signed-off-by: Robert C. Helling <helling@atdotde.de>
This commit is contained in:
Robert C. Helling 2021-01-12 19:39:25 +01:00
parent 5775bd7b27
commit d6712bc5ac
2 changed files with 38 additions and 36 deletions
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14
stats/statsview.h
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@ -31,6 +31,13 @@ class QSGTexture;
enum class ChartSubType : int;
enum class StatsOperation : int;
struct regression_data {
double a,b;
double res2, r2, sx2, xavg;
int n;
};
class StatsView : public QQuickItem {
Q_OBJECT
public:
@ -120,10 +127,9 @@ private:
struct RegressionLine {
std::unique_ptr<QGraphicsPolygonItem> item;
StatsAxis *xAxis, *yAxis;
double a, b; // y = ax + b
double width;
const struct regression_data reg;
void updatePosition();
RegressionLine(double a, double b, double width, QBrush brush, QGraphicsScene *scene, StatsAxis *xAxis, StatsAxis *yAxis);
RegressionLine(const struct regression_data reg, QBrush brush, QGraphicsScene *scene, StatsAxis *xAxis, StatsAxis *yAxis);
};
// A line marking median or mean in histograms
@ -136,7 +142,7 @@ private:
HistogramMarker(double val, bool horizontal, QPen pen, QGraphicsScene *scene, 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 addLinearRegression(const struct regression_data reg, StatsAxis *xAxis, StatsAxis *yAxis);
void addHistogramMarker(double pos, const QPen &pen, bool isHorizontal, StatsAxis *xAxis, StatsAxis *yAxis);
StatsState state;