Create a covariate term that is not convolved with a hemodynamic response function (HRF).
Arguments
- ...
A variable argument set of covariate names.
- data
A data.frame containing the variables.
- id
An optional identifier for the covariate term.
- prefix
An optional prefix to add to the covariate names.
Examples
df1 <- data.frame(x=rnorm(100), y=rnorm(100))
cv <- covariate(x, y, data=df1)