earth (version 1.2-2)

update.earth: Update an 'earth' model

Description

Update an earth model.

Usage

## S3 method for class 'earth':
update(object = stop("no 'object' arg"),
       formula. = NULL, ..., evaluate = TRUE)

Arguments

object

formula.

...

These arguments are the same as earth. The formula. argument is treated like earth's formula argument.

evaluate

If TRUE (default) evaluate the new call else return the call.

Value

• The value is the same as that returned by earth. If object is the only parameter then no changes are made --- the returned value will be the same as the original object.

See Also

earth

Examples

data(ozone1)
(a <- earth(O3 ~ ., data = ozone1, degree = 2))

# yields:
#    Selected 14 of 21 terms, and 8 of 9 predictors
#    Number of terms at each degree of interaction: 1 6 7
#    GCV: 13.74837   RSS: 3662.576   GRSq: 0.7864352   RSq: 0.8265448

update(a, formula = O3 ~ . - temp) # requires forward pass and pruning

# yields:
#    Selected 15 of 21 terms, and 8 of 8 predictors
#    Number of terms at each degree of interaction: 1 5 9
#    GCV: 13.11272   RSS: 3434.579   GRSq: 0.7963093   RSq: 0.8373425

update(a, nprune = 8)              # requires only pruning

# yields:
#    Selected 8 of 21 terms, and 6 of 9 predictors
#    Number of terms at each degree of interaction: 1 5 2
#    GCV: 15.8959    RSS: 4673.984   GRSq: 0.7530759   RSq: 0.7786458