Table 1

Results from the simulation study: mean, bias, mean squared error (MSE) and coverage, by transformation option and model

		Transformation
Model	Variable	None	Logit	Double arcsine
Fixed effects	Mean	0.02810	0.05428	0.05206
	Bias	−0.02190	0.00428	0.00206
	MSE	0.00077	0.00007	0.00006
	Coverage	0.39400	0.92500	0.94300
Random effects	Mean	0.04215	0.05373	0.05162
	Bias	−0.00785	0.00373	0.00162
	MSE	0.00014	0.00007	0.00006
	Coverage	0.82200	0.94700	0.96100
Quality effects	Mean	0.03111	0.05263	0.05145
	Bias	−0.01889	0.00263	0.00145
	MSE	0.00064	0.00006	0.00006
	Coverage	0.63200	0.95500	0.95800