Represents normally distributed endpoints in clinical trials.
normEndp(mu, sigma)vector of the expected responses of the treatment groups, should have
length K
(i.e. one entry for each treatment group).
vector of the standard deviations in each the treatment group,
should have length K (i.e. one entry for each treatment group).
The normEnd function is a constructor function
for an S4 object of the class normEnd representing
a normally distributed endpoint in a clinical trial.
In conjunction with the assess function, normal endpoints
admit the calculation of the exact type-I-error probability and power.
Compute exact or simulated type-I-error: assess.