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proptest()

Usage:
proptest(x[,y],null:val,[upper:T or lower:T,contcor:T|F,pool:T|F])
proptest(s1,n1[,s2,n2],null:val,[upper:T or lower:T,contcor:T|F,pool:T|F])



Keywords: probabilities, descriptive statistics, comparisons
proptest() performs a one- or two-sample z-test for proportions,
depending on whether data for one or two variables are given as
arguments.  Arguments may be either vectors of 0/1 data, or may be
counts of successes and numbers of trials.  By default there is
a two-tailed alternative, but you may choose one-sided alternatives
by using one of lowertail:T or uppertail:T.

You specify the null value via null:value.  For a two-sample test,
only null:0 is allowed.

Use of contcor:T will cause the p-value to be calculated with a
continuity correction.

For a two-sample test, you may specify that the variances be pooled
or unpooled via pool:T or pool:F.

The output is a vector containing the z-statistic and the p-value.


Gary Oehlert 2005-08-12