latticeParseFormula {lattice} | R Documentation |
this function is used in trellis functions. Might
be useful by itself. y
and g_1,...,\g_n
may be missing.
latticeParseFormula(model, data, dimension = 2)
model |
the model/formula to be parsed.
This can be in either of two possible forms, one for 2d and one for
3d formulas, determined by the dimension argument. The 2d
formulas are of the form y~x|g_1*...*g_n , and the 3d
formulas are of the form z~x*y|g_1*...*g_n . In the first
form, y may be omitted. The conditioning variables g_1,
...,g_n can be omitted in either case.
|
data |
the environment/dataset where the variables in the formula are evaluated. By default, the environment where the function was called from. |
dimension |
dimension of the model, see above |
returns a list with components left, right, left.name,
right.name, condition
for 2d, and left, right.x, right.y,
left.name, right.x.name, right.y.name, condition
for 3d.
Saikat DebRoy saikat@stat.wisc.edu