Hlavy {mffSM}R Documentation

Data on head sizes of fetuses

Description

Data on head (“hlava”, plural “hlavy” in Czech) sizes of fetuses (from the ultrasound monitoring) in different periods of pregnancy. Each data value (variable y) is the average over n measurements.

Orignally, data are provided by Hájek and Vorlíčková (1977, p. 134). They are also used for some illustrations in the book Regrese by Karel Zvára (Zvára, 2008).

Usage

data(Hlavy)

Format

A data.frame with 26 rows and the following variables.

i

serial number

t

week of pregnancy

n

number of measurements used to calculate the average head size given in the y variable

y

the average head size obtained from the n measurements performed in week t of pregnancy

Source

http://msekce.karlin.mff.cuni.cz/~zvara/regrese/kniha/R.ZIP

References

Hájek, J. and Vorlíčková, D.(1977). Matematická statistika. Praha: Státní pedagogické nakladatelství.

Zvára, K. (2008). Regrese. Praha: Matfyzpress. ISBN 978-80-7378-041-8.

Examples

data(Hlavy)
summary(Hlavy)

[Package mffSM version 1.2 Index]