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THE DO LOOP

Statistical programming in SAS with an emphasis on SAS/IML programs
Learn SAS | Programming Tips
Rick WicklinMay 15, 2024 0
Rank, order, and sorting

A SAS programmer was trying to implement an algorithm in PROC IML in SAS based
on some R code he had seen on the internet. The R code used the rank() and
order() functions. This led the programmer to ask, "What is the different
between the rank and the order?

Read More
English
Analytics | Programming Tips
Rick WicklinMay 13, 2024 2
The distribution of p-values under the null hypothesis

A SAS statistical programmer recently asked a theoretical question about
statistics. "I've read that 'p-values are uniformly distributed under the null
hypothesis,'" he began, "but what does that mean in practice? Is it important?"
I think data simulation is a great way to discuss the conditions for which
p-values are

Read More
English
Learn SAS | Programming Tips
Rick WicklinMay 8, 2024 0
Dice and the correctness of a simulation

At a recent conference in Las Vegas, a presenter simulated the sum of two dice
and used it to simulate the game of craps. I write a lot of simulations, so I'd
like to discuss two related topics: How to simulate the sum of two dice in SAS.
This is

Read More
English
Data Visualization | Learn SAS | Programming Tips
Rick WicklinMay 6, 2024 5
Visualize patterns of missing values

Years ago, I wrote an article that showed how to visualize patterns of missing
data. During a recent data visualization talk, I discussed the program, which
used a small number of SAS IML statements. An audience member asked whether it
is possible to construct the same visualization by using only

Read More
English
Analytics | Learn SAS
Rick WicklinMay 1, 2024 0
Estimate a proportion and a confidence interval in SAS

A SAS programmer wanted to estimate a proportion and a confidence interval (CI),
but didn't know which SAS procedure to call. He knows a formula for the CI from
an elementary statistics textbook. If x is the observed count of events in a
random sample of size n, then the

Read More
English
Analytics | Programming Tips
Rick WicklinApril 29, 2024 0
Bimodal and unimodal beta distributions

In a recent article, I graphed the PDF of a few Beta distributions that had a
variety of skewness and kurtosis values. I thought that I had chosen the
parameter values to represent a wide variety of Beta shapes. However, I was
surprised to see that the distributions were all

Read More
English
1 2 3 … 168 Next


 * ABOUT
   
   Rick Wicklin, PhD, is a distinguished researcher in computational statistics
   at SAS and is a principal developer of PROC IML and SAS/IML Studio. This blog
   focuses on statistical programming. It discusses statistical and
   computational algorithms, statistical graphics, simulation, efficiency, and
   data analysis. Rick is author of the books Statistical Programming with
   SAS/IML Software and Simulating Data with SAS.
   
     
   
   Follow @RickWicklin on Twitter.
   
   Do you have a SAS programming question? Assistance is available! Ask SAS/IML
   questions at the SAS/IML Support Community. For other SAS issues, visit the
   SAS Support Communities.


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