I have a variable called "Post-Test Score Yi^obs". The book said "normalized the rank of the variable to have mean zero". I think the rank is from 1 (the lowest value) to 16 (the highest value).
54.6
60.6
56.5
55.5
75.2
84.8
75.6
101.9
55.3
70.6
59.3
78.4
87
84.2
73.7
108.6
The normalized rank post-test score Ri is:
-7.5
2.5
-4.5
5.5
0.5
4.5
1.5
7.5
-6.5
-1.5
-3.5
2.5
5.5
3.5
-0.5
7.5
I don't know how to get this column. I tried first to get the average, and then the standard deviation. Then I use the formula (x-xbar)/std.dev. But I got the different column. The original rank column should be (I did):
1
6
4
3
9
13
10
15
2
7
5
11
14
12
8
16