newdata |
Grid of predictor values at which we evaluate the slopes.
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NULL (default): Unit-level slopes for each observed value in the original dataset.
data frame: Unit-level slopes for each row of the newdata data frame.
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datagrid() call to specify a custom grid of regressors. For example:
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newdata = datagrid(cyl = c(4, 6)) : cyl variable equal to 4 and 6 and other regressors fixed at their means or modes.
See the Examples section and the datagrid() documentation.
string:
"mean": Marginal Effects at the Mean. Slopes when each predictor is held at its mean or mode.
"median": Marginal Effects at the Median. Slopes when each predictor is held at its median or mode.
"marginalmeans": Marginal Effects at Marginal Means. See Details section below.
"tukey": Marginal Effects at Tukey's 5 numbers.
"grid": Marginal Effects on a grid of representative numbers (Tukey's 5 numbers and unique values of categorical predictors).
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