MATLAB: Compare function values with constant

chi-square

Hello guys, i want to compare one constant value (LR2) with some function values of the chi-square function. If the function value and the constant value are equal, the loop should stop and should show me, for which value of my parameter the function has the same value as the constant.
I tried this:
LR2=0.0634
for alpha=0:0.001:0.999
  if chi2inv(alpha,1)==LR2
x=alpha
      break
  end
end
x
I know that at one point, chi2inv is exactly 0.0634. I also tried:
LR2=0.0634
tolerance=1e-3
for alpha=0:0.001:0.999
  if  abs(chi2inv(alpha,1)-LR2)<tolerance
x=alpha
      break
  end
end
x
Hope yu understand the question. Thanks for the help.
Sincerly, Ronald Singer

Best Answer

Why don't you simply calculate chi2cdf(LR2,1) ?
Best wishes
Torsten.
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