How to avoid inf

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antonet
antonet 2014-5-29
回答： Udit Gupta 2014-5-29
Dear all,
I take the log of difference between two standard normal CDFs,
that is
D=log(normcdf()-normcdf())
but in most of the cases D=inf. Is there a way to avoid having inf?
Thanks in advance,

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Udit Gupta
Udit Gupta 2014-5-29
Log of zero is -Inf. To avoid that add a small number before taking the log. For example -
D = log(normcdf() - normcdf() + 0.00001)

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