Windspeed data collected at a test site for a windmill, and also at a nearby long-term weather site, in Northern South Dakota. Data collected every six hours for all of 2002, except that all of the month of May and a few other observations are missing.
A data frame with 1116 observations on the following 3 variables.
A text variable with values like "2002/1/2/6" meaning the reading at 6AM on January 2, 2002
Windspeed in m/s at the candidate site
Windspeed for the reference site
Mark Ahlstrom and Rolf Miller, WindLogics, Inc.
Weisberg, S. (2005). Applied Linear Regression, 3rd edition. New York: Wiley, Problem 2.13.