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/*
  t-Student 95%
  skalgo, 11.04.2014, skalgo@cto.gda.pl
  license: GPL
  approximation made with genetic algorithm
  95% - obszar krytyczny dwustronny/two sided
  x - liczba stopni swobody/degrees of freedom
*/
double t_student95(double x)
{
  double a=1.96048293249716643061;
  double b=112.45096438450923415076;
  double c=-4.09189841025756528836;
  double d=94.02382929474076433962;
  double e=-5.51544045075462552319;
  double f=2.72599300200738614564;
  double g=-1.03438324395857916826;
  double h=5.76258451721469455720;
  double i=-2.55831677045899796852;
  double y=a+b*exp(x*c)+d*exp(x*e)+f*pow(x,g)+h*pow(x,i);
  return(y);
}

/*
  t-Student 99%
  skalgo, 17.04.2014, skalgo@cto.gda.pl
  approximation made with genetic algorithm
  99% - obszar krytyczny dwustronny/two sided
  x - liczba stopni swobody/degrees of freedom
*/
double t_student99(double x)
{
 double a=2.58995426584579302443;
 double b=0.22433557303925338866;
 double c=-0.01902748660861116811;
 double d=0.90000462557622384896;
 double e=-0.13156793916760095575;
 double f=31.30129827035404943558;
 double g=-6.25909256710527461820;
 double h=28.75653585111757593040;
 double i=-2.25665257289071563562;
 double y=a+b*exp(x*c)+d*exp(x*e)+f*pow(x,g)+h*pow(x,i);
 return(y);
}

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