## Dimension reduction: Guidelines for retaining principal components

Last week I blogged about the broken-stick problem in probability, which reminded me that the…

By Rick Wicklin 0

Last week I blogged about the broken-stick problem in probability, which reminded me that the…

By Rick Wicklin 0

Skewness is a measure of the asymmetry of a univariate distribution. I have previously shown…

By Rick Wicklin 11

On discussion forums, I often see questions that ask how to Winsorize variables in SAS.…

By Rick Wicklin 1

In the classic textbook by Johnson and Wichern (Applied Multivariate Statistical Analysis, Third Edition, 1992,…

By Rick Wicklin 2

Somewhere in my past I encountered a panel of histograms for small random samples of…

By Rick Wicklin 1

Loess regression is a nonparametric technique that uses local weighted regression to fit a smooth…

By Rick Wicklin 15

The article uses the SAS DATA step and Base SAS procedures to estimate the coverage…

By Rick Wicklin 1

Many univariate descriptive statistics are intuitive. However, weighted statistic are less intuitive. A weight variable…

By Rick Wicklin 2

'Tis a gift to be simple. -- Shaker hymn In June 2015 I published a…

By Rick Wicklin 7

I saw an interesting mathematical result in Wired magazine. The original article was about mathematical…