Hi to everybody,
I' ve to calculate ICC (It's for me the first time)

I'll try to explain the problem better.

2 reviewers (called a and b) judge the presence of risk of bias for 10 items (1a-1b, 2a-2b ....) in 18 studies I have to calculate the intra-class correlation between reviewers. We are dealing with dichotomous data. How to calculate it in STATA? many thanks in advance I'LL TRY WITH "icc study" but it's wrong


Below the dataset

Code:
* Example generated by -dataex-. To install: ssc install dataex
clear
input byte(Study ITEM1a ITEM1b ITEM2a ITEM2b ITEM3a ITEM3b ITEM4a ITEM4b ITEM5a ITEM5b ITEM6a ITEM6b ITEM7a ITEM7b ITEM8a ITEM8b ITEM9a ITEM9b ITEM10a ITEM10b)
 1 1 1 0 0 1 0 0 0 1 1 0 0 1 1 0 0 0 0 1 1
 2 1 1 1 1 0 0 0 0 1 1 0 0 1 1 0 0 1 1 1 1
 3 1 1 1 1 1 1 0 0 0 0 0 0 1 1 0 0 0 0 1 1
 4 1 1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 1 1 1
 5 1 1 1 1 1 0 1 1 1 1 0 0 1 1 0 0 1 1 1 1
 6 1 1 1 1 0 0 0 0 1 1 0 0 1 1 0 0 0 0 1 1
 7 1 1 1 1 1 1 1 1 1 1 0 0 1 1 1 1 1 1 1 1
 8 1 1 1 1 1 1 1 1 1 1 0 0 1 1 1 0 1 1 1 1
 9 1 1 0 0 0 0 1 1 1 1 0 0 1 1 0 0 0 0 0 0
10 1 1 1 0 1 0 1 0 1 1 0 0 0 0 0 0 0 0 1 1
11 1 1 1 1 0 0 1 0 0 0 0 0 0 0 0 0 0 0 0 0
12 1 1 1 1 0 0 1 0 0 0 0 0 1 1 1 1 0 0 1 1
13 1 1 0 0 0 0 1 0 0 0 0 0 1 1 0 0 0 0 1 1
14 1 1 1 1 0 0 1 0 0 0 0 0 0 0 0 0 0 0 1 1
15 1 1 1 1 0 0 1 0 1 1 0 0 0 0 1 1 1 1 1 1
16 1 1 0 0 0 0 0 1 0 0 0 0 1 1 0 0 0 0 1 1
17 1 1 0 0 0 0 1 1 1 1 0 0 1 1 1 0 1 1 1 1
18 1 1 1 0 0 0 0 1 0 0 0 0 0 0 0 0 1 1 1 1

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