My Root configuration

First read ROOT_Installation/Architecture.
The files rootlogon.C and myRootFunctions.C should be linked everywhere you have some pieces of code.

1. rootlogon.C

Here's my rootlogon.C.

2. myRootFunctions.C

Here's one of the function in myRootFunctions.C:

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void MRF_setStatsPosition (TH1 *histo, Int_t color, Double_t x1, Double_t y1, Double_t x2, Double_t y2, Double_t textSize=-1., Bool_t fill=kFALSE, Bool_t setoptfit=kFALSE, Int_t borderSize=1)
{  
   TPaveStats *statbox = (TPaveStats*) histo->GetListOfFunctions()->FindObject("stats") ; 
   if ( !statbox ) { 
      fprintf (stderr, "\n\n!!! Error in 'MRF_setStatsPosition': histogram '%s' does not have a statbox. \n\n",histo->GetName()) ; getchar() ; exit(1) ; 
   }
   else {
      statbox->SetTextColor(color) ; statbox->SetLineColor(color) ; statbox->SetShadowColor(kWhite) ;
      statbox->SetX1NDC(x1) ; statbox->SetY1NDC(y1) ; statbox->SetX2NDC(x2) ; statbox->SetY2NDC(y2) ; 
      if ( textSize != -1. ) { statbox->SetTextSize(textSize) ; }
      statbox->SetShadowColor(kWhite) ; statbox->SetBorderSize(borderSize) ;
      if ( fill ) { statbox->SetFillStyle(1) ; statbox->SetFillColor(kWhite) ; } else { statbox->SetFillStyle(0) ; }
      if ( !setoptfit ) { statbox->SetOptFit(0) ; }
   }
   return ;
}
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It should be called this way in your program:

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#include "myRootFunctions.C"
// ...
void myFunction ()
{
   // TH1F* histo = new TH1F ...
   // histo->Draw() ; 
   MRF_setStatsPosition (histo, kRed, 0.66,0.55,0.91,0.87) ;

   return ; 
}
----------------------------------------------------------------------------

3. Coding conventions

For proper Root coding, please see here
If you use NEdit, please see here.