The first line of this week's SAS tip grabs your attention, "PROC SQL provides a helpful (though potentially dangerous) tool in the form of the DESCRIBE TABLE statement." SAS author, consultant, and member of the SAS-L Hall of Fame Howard Schreier included this intriguing statement in his book PROC SQL by Example: Using
In yesterday's post, I discussed a "quick and dirty" method to smooth periodic data. However, after I smoothed the data I remarked that the smoother itself was not exactly periodic. At the end points of the periodic interval, the smoother did not have equal slopes and the method does not
Over at the SAS and R blog, Ken Kleinman discussed using polar coordinates to plot time series data for multiple years. The time series plot was reproduced in SAS by my colleague Robert Allison. The idea of plotting periodic data on a circle is not new. In fact it goes
