earth (version 0.1-2)

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". The updated call is printed if the trace a

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 11 of 21 terms, and 8 of 9 predictors
#    Number of terms at each degree of interaction: 1 5 5
#    GCV: 13.43422     RSS: 3762.234     GRSq: 0.7913151     RSq: 0.8218252 

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: 13.14588     RSS: 3443.265     GRSq: 0.7957941     RSq: 0.8369311 

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: 15.07944     RSS: 4433.915     GRSq: 0.7657586     RSq: 0.7900152

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