rand function

rand functions to use in the rpsftm() formula

A function that is defined to be used in the formula argument, and identified as specials in the terms() object

rand(arm, rx)

Arguments

• arm: the randomised treatment arm. a factor with 2 levels, or numeric variable with values 0/1.
• rx: the proportion of time on active treatment (arm=1 or the non-reference level of the factor)

Returns

matrix with two columns named arm and rx. These can be used in the formula argument to rpsftm()

Examples

x <- with(immdef, rand(imm , 1 - xoyrs / progyrs ) )
x
class(x)
y <- as.data.frame(x)
head(y)

See Also

print.rand, rpsftm

Author(s)

Simon Bond