ppine {systemfit} | R Documentation |
A subset of tree growth observations from a Ponderosa pine growth database.
The ppine
data frame has 166 rows and 8 columns.
data(ppine)
This data frame contains the following columns:
The exogenous variables are elev
, smi
, dbh
,
tht
, cr
, and ba
; the endogenous variables
dg
and hg
. There are no lagged variables in the dataset
and the observations are for a single remeasurement.
The data was provided by the USDA Forest Service Intermountain Research Station.
William R. Wykoff wwykoff@fs.fed.us Rocky Mountain Research Station, 1221 South Main Street, Moscow, ID 83843
data(ppine)