instances | R Documentation |
A symbolic wrapper, for use in the formula argument to
gnm
, to specify multiple instances of a term specified
by a function with an inst
argument.
instances(term, instances = 1)
term |
a call to a function with an inst argument, which specifies some term. |
instances |
the desired number of instances of the term. |
A deparsed expression representing the summation of term
specified with inst = 1
, inst = 2
, ..., inst =
instances
, which is used to create an expanded formula.
Heather Turner
gnm
, formula
,
nonlin.function
, Mult
,
MultHomog
## Not run:
## (this example can take quite a while to run)
##
## Fitting two instances of a multiplicative interaction (i.e. a
## two-component interaction)
yield.scaled <- wheat$yield * sqrt(3/1000)
treatment <- factor(paste(wheat$tillage, wheat$summerCrop, wheat$manure,
wheat$N, sep = ""))
bilinear2 <- gnm(yield.scaled ~ year + treatment +
instances(Mult(year, treatment), 2),
family = gaussian, data = wheat)
## End(Not run)
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