# Randomization on Minitab

The following is easier than the steps in Section 3.2:

1. Start as in Step 1 on p. 34: Enter r1 1's. r2 2's, etc. into a column. You can do this by hand. If your design is balanced, you can use Set Patterned Data (Calc menu). For example, if you have three groups of 4 each, specify to start at 1, end at 3, with increment 1, and then enter 4 in "Repeat each value".

2.  To randomize, choose Random Data from the Calc menu, then Sample from Columns. Enter the total number of observations desired (n = sum of the ri's) in "Sample ____ rows", enter the column you just made after "from," and the column where you want the randomized numbers in "Store samples in." Sample output (using 2,2, and 3 as treatment sizes):

 obs treat randtr 1 1 1 2 1 3 3 2 1 4 2 3 5 3 3 6 3 2 7 3 2

(I have added a column "obs" for convenience.) This says assign experimental units 1 and 3 (first column) to treatment 1 (last column), units 6 and 7 to treatment 2, and units 2, 4, and 5 to treatment 3. (Note that the second column was just an intermediate step.)