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Rick WicklinMarch 9, 2011 0

Cuzick's Test for Trend: A case study in translating a MATLAB program into the SAS/IML language

Several times a year, I am contacted by a SAS account manager who tells me that a customer has asked whether it is possible to convert a MATLAB program to the SAS/IML language. Often the customer has an existing MATLAB program and wants to include the computation as part of

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Advanced Analytics

Rick WicklinMarch 7, 2011 0

Need case-insensitive string comparisons? UPCASE!

String comparisons in SAS software are case-sensitive. For example, the uppercase letter "F" and lowercase letter "f" are treated as unique characters. When these two letters represent the same condition (for example, a female patient), the strings need to be handled in a case-insensitive manner, and a SAS programmer might

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Rick WicklinMarch 4, 2011 0

How to use transparency to overcome overplotting

Do you have many points in your scatter plots that overlap each other? If so, your graph exhibits overplotting. Overplotting occurs when many points have similar coordinates. For example, the following scatter plot (which is produced by using the ODS statistical graphics procedure, SGPLOT) displays 12,000 points, many of which

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