Extract model formulae from an mjoint object — formula.mjoint • joineRML

Extract model formulae from an mjoint object.

Usage

# S3 method for class 'mjoint'
formula(x, process = c("Longitudinal", "Event"), k = 1, ...)

x: an object inheriting from class mjoint for a joint model of time-to-event and multivariate longitudinal data.
process: character string: if process='Longitudinal' a fixed effects formula from the (multivariate) longitudinal sub-model is returned for the k-th outcome. Else, if process='Event', the time-to-event model formula is returned.
k: integer: a number between 1 and K (the total number of longitudinal outcomes) that specifies the longitudinal outcome of interest.
...: additional arguments; currently none are used.

An object of class "formula" which contains a symbolic model formula for the separate sub-model fixed effect terms only.

Pinheiro JC, Bates DM. Mixed-Effects Models in S and S-PLUS. New York: Springer Verlag; 2000.

Wulfsohn MS, Tsiatis AA. A joint model for survival and longitudinal data measured with error. Biometrics. 1997; 53(1): 330-339.