Example to use chi2 test for comparing two histograms One unweighted histogram is compared with a weighted histogram.
The normalized residuals are retrieved and plotted in a simple graph. The QQ plot of the normalized residual using the normal distribution is also plotted.
Chi2 = 21.085124, Prob = 0.332116, NDF = 19, igood = 1
(TCanvas *) 0x562bc0f43fa0
{
for (
Int_t i=0; i<
n; i++)
x[i]= 4.+i*12./20.+12./40.;
resgr->
SetTitle(
"Normalized Residuals");
TF1 *
f =
new TF1(
"f",
"TMath::Gaus(x,0,1)",-10,10);
qqplot->
SetTitle(
"Q-Q plot of Normalized Residuals");
}
virtual void SetMarkerColor(Color_t mcolor=1)
Set the marker color.
virtual void SetMarkerStyle(Style_t mstyle=1)
Set the marker style.
virtual void SetMarkerSize(Size_t msize=1)
Set the marker size.
virtual void SetRangeUser(Double_t ufirst, Double_t ulast)
Set the viewing range for the axis from ufirst to ulast (in user coordinates).
This class allows to draw quantile-quantile plots.
A TGraph is an object made of two arrays X and Y with npoints each.
virtual void SetTitle(const char *title="")
Change (i.e.
virtual void Draw(Option_t *chopt="")
Draw this graph with its current attributes.
TAxis * GetXaxis() const
Get x axis of the graph.
TAxis * GetYaxis() const
Get y axis of the graph.
1-D histogram with a double per channel (see TH1 documentation)}
virtual void SetTitle(const char *title)
See GetStatOverflows for more information.
virtual Double_t Chi2Test(const TH1 *h2, Option_t *option="UU", Double_t *res=0) const
test for comparing weighted and unweighted histograms
virtual void SetBinError(Int_t bin, Double_t error)
Set the bin Error Note that this resets the bin eror option to be of Normal Type and for the non-empt...
virtual void SetBinContent(Int_t bin, Double_t content)
Set bin content see convention for numbering bins in TH1::GetBin In case the bin number is greater th...
virtual void Draw(Option_t *option="")
Draw this histogram with options.
virtual void SetEntries(Double_t n)
virtual void SetTitle(const char *title="")
Set the title of the TNamed.
- Author
- Nikolai Gagunashvili, Daniel Haertl, Lorenzo Moneta
Definition in file chi2test.C.