*
* Example of simple regression from pp 191-193
*
open data pulppric.dat
data(format=free,org=columns) 1 25 shipments price
*
* The instruction LINREG does a linear regression of one variable on a list of
* other variables. The variable CONSTANT is a predefined column of 1's. LINREG
* can be done using the Regressions wizard.
*
linreg shipments
# constant price
*
* SCATTER does x-y graphs. The hlabels and vlabels options put informative labels
* on the horizontal and vertical axes. LINE=%BETA adds a line based upon the
* coefficients from the last regression.
*
scatter(footer="Figure 5-5 Scatterplot of Pulp Data",line=%beta,$
  hlabel="World Pulp Price",vlabel="Pulp shipments")
# price shipments
*
* Scatter plot of residuals (from page 204)
*
scatter(footer="Figure 5-11 Residual plot from Pulp Regression",$
 hlabel="World Pulp Price",vlabel="Residuals")
# price %resids