Geissler's Data on the Human Sex Ratio
Geissler (1889) published data on the distributions of boys and girls in families in
Saxony, collected for the period 1876-1885. The Geissler data tabulates
the family composition of 991,958 families by the number of boys and girls
listed in the table supplied by Edwards (1958, Table 1).
data(Geissler)
A data frame with 90 observations on the following 4 variables. The rows represent the non-NA entries in Edwards' table.
boysnumber of boys in the family, 0:12
girlsnumber of girls in the family, 0:12
sizefamily size: boys+girls
Freqnumber of families with this sex composition
The data on family composition was available because, on the birth of a child, the parents had to state the sex of all their children on the birth certificate. These family records are not necessarily independent, because a given family may have had several children during this 10 year period, included as multiple records.
Edwards, A. W. F. (1958). An Analysis Of Geissler's Data On The Human Sex Ratio. Annals of Human Genetics, 23, 6-15.
Friendly, M. and Meyer, D. (2016). Discrete Data Analysis with R: Visualization and Modeling Techniques for Categorical and Count Data. Boca Raton, FL: Chapman & Hall/CRC. http://ddar.datavis.ca.
Geissler, A. (1889). Beitrage zur Frage des Geschlechts verhaltnisses der Geborenen Z. K. Sachsischen Statistischen Bureaus, 35, n.p.
Lindsey, J. K. & Altham, P. M. E. (1998). Analysis of the human sex ratio by using overdispersion models. Journal of the Royal Statistical Society: Series C (Applied Statistics), 47, 149-157.
Saxony, containing the data for families of size 12.
data(Geissler) ## maybe str(Geissler) ; plot(Geissler) ... # reproduce Saxony data, families of size 12 Saxony12<-subset(Geissler, size==12, select=c(boys, Freq)) rownames(Saxony12)<-NULL # make a 1-way table xtabs(Freq~boys, Saxony12) # extract data for other family sizes Saxony11<-subset(Geissler, size==11, select=c(boys, Freq)) rownames(Saxony11)<-NULL Saxony10<-subset(Geissler, size==10, select=c(boys, Freq)) rownames(Saxony10)<-NULL
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