data a;
input z p q e;
cards;
1.96 0.95 0.05 0.05
;
data b;
set a;
n=(z*z*p*q)/(e*e);
run;
proc print; run;
proc power;
onesamplefreq test=z method=normal
sides = 2
alpha = 0.05
nullproportion = 0.90
proportion = 0.95
ntotal = .
power = 0.9;
run;
Because your formula is not the one used by POWER. See the details at:
right, I know, I understand that. But one is confidence interval estimation and the 'proc power' is hypothesis testing. They should be more in agreement, right?
Not necessarily. These are different things.
POWER is involved with Type II error. The other approach is not.
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