Usage
## S3 method for class 'cdtafit,missing':
plot(x, title.1 = NULL, title.2 = NULL,
title.3 = NULL, graph = NULL, width = 0.2, shape.1 = 19,
size.1 = 2.5, shape.2 = 8, size.2 = 2.5, shape.O = 9, size.O = 3.5,
cols.1 = NULL, cols.2 = NULL, digits = 3, ...)