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Programming Tips

Strengthen your programming skills with tips and techniques from the experts

Robert AllisonAugust 26, 2019 0

Where to take a scenic drive in each of the 50 US states!

Summer is winding down, and cooler fall weather is just around the corner. You might soon be able to take a pleasant drive with the windows down, while enjoying the scenery. But where should you go? What are the most scenic roads for that drive? Read along to see a

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Travel

Programming Tips

Rick WicklinAugust 26, 2019 0

Conditionally append observations to a SAS data set

Most SAS programmers know how to use PROC APPEND or the SET statement in DATA step to unconditionally append new observations to an existing data set. However, sometimes you need to scan the data to determine whether or not to append observations. In this situation, many SAS programmers choose one

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Programming Tips

Rick WicklinAugust 21, 2019 0

Two tips for optimizing a function that has a restricted domain

An important application of nonlinear optimization is finding parameters of a model that fit data. For some models, the parameters are constrained by the data. A canonical example is the maximum likelihood estimation of a so-called "threshold parameter" for the three-parameter lognormal distribution. For this distribution, the objective function is

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