evap
Soil Evaporation Data
Description
The observations in the evap.x and evap.y data sets represent 46 consecutive days from June 6 through July 21.
From Freund (1979): "It is desired to estimate the daily amount of evaporation from the soil as a function of air temperature, relative humidity, and wind.
Since these factors vary considerably throughout the day it is not clear what function or aspect of these variables is most important.
For this reason the following ten variables relating to these factors are recorded."
Arguments
| evap.x |
matrix of independent variables:
maximum, minimum, and average soil temperatures; maximum, minimum, and average air temperature; maximum, minimum, and average relative humidity; and, total wind in miles per day.
The three "average" measurements are integrated:
average soil temperature is the integrated area under the daily soil temperature curve, average air temperature is the integrated area under the daily air temperature curve, and average relative humidity is the integrated area under the daily relative humidity curve.
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| evap.y |
daily amount of evaporation from the soil.
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Source
Freund, R.J. (1979).
Multicollinearity etc., Some "new" Examples.
American Statistical Association Proceedings of Statistical Computing Section, pp. 111--112.
Republished by permission of the American Statistical Association.