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Update psem model object with additional values.
# S3 method for psem update(object, ...)
a psem object
additional arguments to update
mod <- psem( lm(rich ~ cover, data = keeley), lm(cover ~ firesev, data = keeley), lm(firesev ~ age, data = keeley), data = keeley ) update(mod, firesev ~ age + cover)
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