The DO Loop
Statistical programming in SAS with an emphasis on SAS/IML programs
A Pareto chart is a popular chart for statistical quality control. It is often used to display the relative frequencies of issues that affect the quality of a manufacturing process. A bar chart displays the frequency of each issue that causes a defect. The bars are ordered by height: the
This article shows how to compute a confidence band for a Q-Q plot in SAS. A previous article shows how to construct confidence bands for the CDF of continuous univariate data. The bands can be added to a plot of the empirical CDF (ECDF) for the data. One of the
A previous article shows how to construct an empirical cumulative distribution function (ECDF) for univariate data by using PROC UNIVARIATE or in the SAS IML language. The ECDF is a tool for visualizing the distribution of a sample and is helpful for estimating quantiles in the data. In statistics, we