1. Exercise
Find quality estimates for round 3 (Estonia) items B37, B38 and B39.
If observed correlations between
B37 and B38 is .439;
B37 and B39 is .441;
B38 and B39 is .470;
What would be true correlations, after correction for measurement error?

2. Exercise real ρ q=√q2 x y q1 q2 x1 y1 obs ρ obs ρ = q1 * real ρ * q2
real ρ = obs ρ / q1*q2
If x1 and y1 have same method, the method effect should also be taken into account!

3. Exercise

4. Exercise Extra assignment B5 and B7 round 2 (Estonia)
If observed correlation is .551, what is the real correlation?