dutchboys | R Documentation |

Data from the fourth dutch growth study in 1997.

data(dutchboys)

A data frame with 6848 observations on the following 10 variables.

`defnr`

identification number

`age`

age in decimal years

`hgt`

length/height in cm

`wgt`

weight in kg

`hc`

head circumference in cm

`hgt.z`

z-score length/height

`wgt.z`

z-score weight

`hc.z`

z-score head circumference

`bmi.z`

z-score body mass index

`hfw.z`

z-score height for weight

z-scores were calculated relative to the Dutch references.

The Fourth Dutch Growth Study is a cross-sectional study that measures growth and development of the Dutch population between ages 0 and 21 years. The study is a follow-up to earlier studies performed in 1955, 1965 and 1980, and its primary goal is to update the 1980 references.

van Buuren S and Fredriks A (2001)
*Worm plot: A simple diagnostic device for modeling growth reference curves*
Statistics in Medicine, 20:1259-1277

Schnabel S and Eilers P (2009)
* Optimal expectile smoothing *
Computatational Statistics and Data Analysis, 53: 4168-4177

data(dutchboys) expreg <- expectreg.ls(dutchboys[,3] ~ rb(dutchboys[,2],"pspline"),smooth="f", estimate="restricted",expectiles=c(.05,.5,.95)) plot(expreg)

expectreg documentation built on March 18, 2022, 5:57 p.m.

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