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Chris Hemedinger 0
Smart Cats with blogs on stats

Let's face it: ever since cats learned how to access the Internet, they've managed to besmirch their prestigious status as the "smarter-if-a-bit-aloof" pet. They've starred in many demeaning YouTube videos, bringing shame to their species for the sake of some cheap laughs. But I'm here to tell you: there are

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Rick Wicklin 0
Sampling with replacement

Sampling with replacement is a useful technique for simulations and for resampling from data. Over at the SAS/IML Discussion Forum, there was a recent question about how to use SAS/IML software to sample with replacement from a set of events. I have previously blogged about efficient sampling, but this topic

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Mike Gilliland 0
Mistakes in the Forecasting Hierarchy

Many forecasting software packages support hierarchical forecasting. You define the hierarchical relationship of your products and locations, create forecasts at one or more levels, and then reconcile the forecasts across the full hierarchy. In a top-down approach, you generate forecasts at the highest level and apportion it down to lower

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Rick Wicklin 0
Tricks and Treats

How can you change a programming trick into a programming treat? Try this algorithm: If you develop a clever snippet of code, squirrel it away. This snippet is a "trick." If you use the trick a second time, copy and modify the code. The trick has become a "treat." If

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Rick Wicklin 0
Evaluate an iterated integral

The SAS/IML language provides the QUAD function for evaluating one-dimensional integrals. You can also use the QUAD function to compute a double integral as an iterated integral. A One-Dimensional Integration Suppose you want to evaluate the following integral: To evaluate this integral in the SAS/IML language: Define a function module

Chris Hemedinger 0
Statistics: why doesn't everybody love them?

I am not a statistician, but I love statistics. Statistics are facts, and when used for good, they are an important ingredient in sound decision making about almost any issue, whether it's about government policy or your personal behavior. The use of statistics has gone way beyond counting things, computing

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Rick Wicklin 0
What is IMLPlus?

The IMLPlus language has been available to SAS customers since 2002, but there are still many people who have never heard of it. What is IMLPlus? The documentation SAS/IML Studio for SAS/STAT Users says this about IMLPlus: The programming language in SAS/IML Studio, which is called IMLPlus, is an enhanced

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Rick Wicklin 0
A statistical word puzzle!

Today's post is a puzzle. Why? Well, my wife loves solving word puzzles, and today is our wedding anniversary. Last year, I bought her a Jumble® book. This year, I've created a one-of-a-kind scrambled word puzzle just for her. (But you can play, too!) I created this puzzle by using

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