Hello,


I would like to know which test to use on Stata according to my configuration.

So I want to compare 3 ways to collect data
So I have 3 groups for which I collect a Y variable according to the methods A B C, and for each person I also collect the Y variable but according to the reference method (called y_base).

It looks like this with random data generated (in my database, i have something like 500 people in each groups)

Code:
* Example generated by -dataex-. To install: ssc install dataex
clear
input float id str1 module float(y_base y)
1 "A" 6 2
2 "A" 7 3
3 "A" 6 4
4 "A" 4 4
5 "A" 6 2
6 "A" 4 2
7 "A" 4 5
8 "A" 3 2
9 "A" 6 2
10 "A" 4 6
11 "A" 7 3
12 "A" 5 1
13 "A" 3 3
14 "A" 5 5
15 "A" 1 5
16 "A" 6 4
17 "A" 4 4
18 "A" 3 3
19 "A" 3 5
20 "A" 4 5
21 "B" 4 5
22 "B" 5 3
23 "B" 2 3
24 "B" 3 5
25 "B" 1 5
26 "B" 4 5
27 "B" 1 8
28 "B" 4 6
29 "B" 7 3
30 "B" 8 5
31 "B" 2 5
32 "B" 8 4
33 "B" 7 4
34 "B" 8 1
35 "B" 4 5
36 "B" 6 4
37 "B" 5 7
38 "B" 5 2
39 "B" 5 6
40 "B" 5 5
41 "C" 6 3
42 "C" 8 4
43 "C" 6 3
44 "C" 5 4
45 "C" 6 4
46 "C" 6 4
47 "C" 6 4
48 "C" 3 2
49 "C" 6 3
50 "C" 7 2
51 "C" 5 2
52 "C" 7 4
53 "C" 7 4
54 "C" 4 2
55 "C" 5 2
56 "C" 5 5
57 "C" 6 2
58 "C" 3 5
59 "C" 4 1
60 "C" 5 3
end
Which test on Stata should i use to check which one is closer to my y_base ?

Thanks you