Posts Tagged ‘ PROC FORMAT ’

What’s our sign?

September 13, 2011
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What’s our sign?

Rick Wicklin and I are engaged in an arms race of birthday-related blog posts.  To recap: Rick analyzed national data about births in the USA and what time of year they are most likely to occur. I responded by analyzing the birthdays of my Facebook friends. Rick responded by analyzing
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Optimize many-to-one mapping by user-defined functions

March 31, 2011
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Optimize many-to-one mapping by user-defined functions

In many occasions, fast access into a lookup table to find desired value is necessary. In computer science, linked list, associative array, and hash table are widely used to construct the relationship between values and keys. Hash function, like value...
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The efficiency of five SAS methods in multi-dataset merging

November 28, 2010
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The efficiency of five SAS methods in multi-dataset merging

Introduction: Merging two or multiple datasets is essential for many ‘data people’. Yes, it is a dirty and routine job. Everyone wants to get it done quick and accurate. Actually, SAS has many ways to tackle this job. In two competing papers fro...
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Summary Numerical Data in a Rolling Window

October 29, 2010
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Obtain summary statistics over a rolling window for a given data, usually on a time dimension, is not quit easy in SAS, especially the rolling window may contain different number of records and the maximum number is unknown without pass the data once...
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