options
ps=60 ls=80 pageno=1 formdlim='_';data
coal;/* The random statement below tells SAS which factors are random (there is
only one here!). */
proc
glm;/* The varcomp procedure gives us variance component estimates. */
proc varcomp method=type1;/* This gives us the overall mean of the response (for Example 12.4). */
proc
means;