These are partly contrived data from Kmenta (1986), constructed to illustrate estimation of a simultaneous-equation model.
The Kmenta data frame has 20 rows and 5 columns.
KmentaThis data frame contains the following columns:
food consumption per capita.
ratio of food prices to general consumer prices.
disposable income in constant dollars.
ratio of preceding year's prices received by farmers to general consumer prices.
time in years.
The exogenous variables D, F, and A are based on
 real data; the endogenous variables P and Q were generated
 by simulation.