I'm a statistician. Nice app, but a couple comments.
1) What's N? If comparing more than one group, the app should say that it's N/Group.
2) The proportions calculator is incorrect for two groups. If I enter alpha=0.05, beta=0.10, p1=0.4 and p2=0.3, the app gives N=388 (per group). The correct answer (assuming a Z-test) is N=477.
I'm a statistician. Nice app, but a couple comments.
ReplyDelete1) What's N? If comparing more than one group, the app should say that it's N/Group.
2) The proportions calculator is incorrect for two groups. If I enter alpha=0.05, beta=0.10, p1=0.4 and p2=0.3, the app gives N=388 (per group). The correct answer (assuming a Z-test) is N=477.
Ciao,
Chuck