lidar data frame has 221 observations
from a light detection and ranging (LIDAR) experiment.
This data frame contains the following columns:
distance travelled before the light is reflected back to its source.
logarithm of the ratio of received light from two laser sources.
Sigrist, M. (Ed.) (1994). Air Monitoring by Spectroscopic Techniques (Chemical Analysis Series, vol. 197). New York: Wiley.
Ruppert, D., Wand, M.P. and Carroll, R.J. (2003)
Semiparametric Regression Cambridge University Press.
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