Fills in values in gaps between observed predictor values to help produce a smooth graph of predicted values versus predictor values.
1 |
data |
data frame with values of x that need filling in |
form |
formula idenfying variable x to fill in and grouping variables, g1, g2, etc.
using syntax: |
n |
number of additional points over range of predictor (default 200) |
xpd |
expansion beyond range of predictor (default 1.0, i.e. no expansion) |
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