Figure 2.

Empirical size and power of constant mixing weight and stratum-specific mixing weight tests at 5% significance level, homogeneous model is Poisson. The black lines represent the data generated under the null model ( ${\mathit{\omega }}_c^{\ast }={\mathit{\omega }}_{ss}^{\ast }=0$). The red and blue lines represent the data generated under the constant ( ${\mathit{\omega }}_c^{\ast }$) and the stratum-specific ( ${\mathit{\omega }}_{ss}^{\ast }$) mixing weight model, respectively:

True mixing weight is zero (size): ——— stratum-specific mixing weight test; – – – constant mixing weight test

True mixing weight is constant (power): stratum-specific mixing weight test; constant mixing weight test

True mixing weight is stratum-specific (power): stratum-specific mixing weight test; constant mixing weight test.