Prevalence at X = 5

Method

Zero Slope

Medium Slope

High Slope


 
Size^{†}

Power^{†}

Power^{†}


0.3

LogBinomial

0.054

0.477

0.989


Robust Poisson

0.051

0.461

0.984

0.5

LogBinomial

0.049

0.279

0.856


Robust Poisson

0.050

0.275

0.842

0.7

LogBinomial

0.045

0.256

0.825


Robust Poisson

0.045

0.258

0.815

 * Same simulations as in Table 1. Estimated size and power are the proportions of the 1,000 simulations which have a pvalue less than or equal to 0.05. The logbinomial method used the COPY method approximation when needed. Wald tests were used for the Robust Poisson method, and likelihood ratio tests were used for the logbinomial method.

^{†} Size is the probability of concluding that the true slope is not zero when in fact it is zero, and power is the probability of concluding that the true slope is not zero when in fact it is not zero.