Dear All,
I've noticed that the family of cumulative distribution functions such as
cdfnor(), which are very handy because of their flexibility, in the syntax cases
X = cdfnor("X", Mean, Std, P, Q)
Mean = cdfnor("Mean", Std, P, Q, X)
Std = cdfnor("Std", P, Q, X, Mean)
it is required to provide both P and Q as arguments, when only one is really
necessary since Q must equal 1-P. Argument Q is, thus, redundant, and requires
extra calculation (even if a trivial one). In the first syntax one could easily
remove Q, but the syntax checker casts an error:
cdfnor: Wrong number of input argument(s): 5 expected.
Is there a reason for such a strange requirement?
I know that changing the syntax of an established function could cause
back-compatibility issues, but it would be much better.
A possible solution would be to create a single function cdf(), the first argument of which could
be a string coding the type of distribution, such as "nor", "chi", etc., which
could be omitted in the default case of the most frequent one, the normal distribution. This could
be interesting also since new distributions could be added in the future without the need of a new
function.
Regards,
Federico Miyara
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