I am in some trouble to understand how is to calculate the overall relative bias. In this link, there are results of overall relative bias in "Parameter estimates" sub-section under "Results" section. There they mentioned that :
Could you please explain me how did they calculate it? I had thought that if I calculate the mean of the column of \(\gamma_{00}\) in table 1, that is, \((8.77+4.75+3.94+\ldots-0.06-0.14)/27\) , I would get overall mean of \(\gamma_{00}\). But it doesn't match with the result.
Also, they wrote that
I am not understanding how have they calculated that the reduced bias is 6% in this case?
the overall biases for the fixed effect parameters \(\gamma_{00}\), \(\gamma_{01}\), \(\gamma_{10}\), and \(\gamma_{11}\) were 0.6%, 2.6%, 1.4%, and 3.7% respectively.
Also, they wrote that
When the size of the group was increased to 30 with 30 groups, the bias was reduced to less than 6%.