CHIINV error
 

Hi - According to the Excel Help info, the CHIINV function should work with
degrees of freedom up to 10^10, but I get a #NUM error whenever the value is
greater than 1037. Example: CHIINV(0.95,1038) gives a #NUM error, as does
any other degrees of freedom value of 1038 or more. Can anyone help me with
this? (Am I doing something wrong?, or Is there a way to work around this
problem?) Thank you - Amy