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Corret the t-value von a C.I. of 95%

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It's 1.960, not 2

Suggested-by: Willem Ferguson <willemferguson@zoology.up.ac.za>
Signed-off-by: Robert C. Helling <helling@atdotde.de>
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Robert C. Helling 2021-01-19 19:26:47 +01:00
parent 25cfd852b9
commit 625fa139a9
1 changed files with 2 additions and 2 deletions
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stats/statsview.cpp
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@ -752,10 +752,10 @@ void StatsView::RegressionLine::updatePosition()
QPolygonF poly;
for (double x = minX; x <= maxX + 1; x += (maxX - minX) / 100)
poly << QPointF(xAxis->toScreen(x),
yAxis->toScreen(reg.a * x + reg.b + 2.0 * sqrt(reg.res2 / (reg.n - 2) * (1.0 / reg.n + (x - reg.xavg) * (x - reg.xavg) / (reg.n - 1) * (reg.n -2) / reg.sx2))));
yAxis->toScreen(reg.a * x + reg.b + 1.960 * sqrt(reg.res2 / (reg.n - 2) * (1.0 / reg.n + (x - reg.xavg) * (x - reg.xavg) / (reg.n - 1) * (reg.n -2) / reg.sx2))));
for (double x = maxX; x >= minX - 1; x -= (maxX - minX) / 100)
poly << QPointF(xAxis->toScreen(x),
yAxis->toScreen(reg.a * x + reg.b - 2.0 * sqrt(reg.res2 / (reg.n - 2) * (1.0 / reg.n + (x - reg.xavg) * (x - reg.xavg) / (reg.n - 1) * (reg.n -2) / reg.sx2))));
yAxis->toScreen(reg.a * x + reg.b - 1.960 * sqrt(reg.res2 / (reg.n - 2) * (1.0 / reg.n + (x - reg.xavg) * (x - reg.xavg) / (reg.n - 1) * (reg.n -2) / reg.sx2))));
QRectF box(QPoint(xAxis->toScreen(minX), yAxis->toScreen(minY)), QPoint(xAxis->toScreen(maxX), yAxis->toScreen(maxY)));
item->setPolygon(poly.intersected(box));