prop.trend.test            package:stats            R Documentation

Test for trend in proportions

Description:

     Performs chi-squared test for trend in proportions, i.e., a test
     asymptotically optimal for local alternatives where the log odds
     vary in proportion with 'score'.  By default, 'score' is chosen as
     the group numbers.

Usage:

     prop.trend.test(x, n, score = 1:length(x))

Arguments:

       x: Number of events 

       n: Number of trials 

   score: Group score 

Value:

     An object of class '"htest"' with title, test statistic, p-value,
     etc.

Note:

     This really should get integrated with 'prop.test'

Author(s):

     Peter Dalgaard

See Also:

     'prop.test'

Examples:

     smokers  <- c( 83, 90, 129, 70 )
     patients <- c( 86, 93, 136, 82 )
     prop.test(smokers, patients)
     prop.trend.test(smokers, patients)
     prop.trend.test(smokers, patients,c(0,0,0,1))

