To study the growth of the wood mass in a cultivated forest of Pinus nigra located in the north of Palencia (Spain), a sample of 362 trees was studied. The data set is made of measurements of heights (in meters), in variable "HT", and diameters (in millimetres), in variable "Diameter", of these trees. The presence of three linear groups can be guessed apart from a small group of trees forming its own cluster with larger heights and diameters one isolated tree with the largest diameter but small height. More details on the interpretation of this dataset in García-Escudero et al (2010).
data(pine)A data frame containing 362 observations in 2 variables. The variables are as follows:
Diameter Diameter
HT Height
García-Escudero, L. A., Gordaliza, A., Mayo-Iscar, A., and San Martín, R. (2010). Robust clusterwise linear regression through trimming. Computational Statistics & Data Analysis, 54(12), 3057--3069.