R Dataset / Package hwde / mendelABC

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How to Compute the Median

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<iframe src="https://embed.picostat.com/r-dataset-package-hwde-mendelabc.html" frameBorder="0" width="100%" height="307px" />
Attachment Size
dataset-32859.csv 530 bytes
Dataset License
GNU General Public License v2.0
Documentation License
GNU General Public License v2.0
Dataset Help

On this Picostat.com statistics page, you will find information about the mendelABC data set which pertains to Mendel's F2 trifactorial data for seed shape (A: round or wrinkled), cotyledon color (B: albumen yellow or green), and seed coat color (C: grey-brown or white). The mendelABC data set is found in the hwde R package. You can load the mendelABC data set in R by issuing the following command at the console data("mendelABC"). This will load the data into a variable called mendelABC. If R says the mendelABC data set is not found, you can try installing the package by issuing this command install.packages("hwde") and then attempt to reload the data. If you need to download R, you can go to the R project website. You can download a CSV (comma separated values) version of the mendelABC R data set. The size of this file is about 530 bytes.

Documentation

Mendel's F2 trifactorial data for seed shape (A: round or wrinkled), cotyledon color (B: albumen yellow or green), and seed coat color (C: grey-brown or white)

Description

The mendel3 data frame has 27 rows and 4 columns. Data are from Mendel (1886), and are reproduced in Fisher (1936) and Weir (1996).

Usage

data(mendelABC)

Format

This data frame contains the following columns:

seedshape

Factor with levels: AA, Aa and aa

cotylcolor

Factor with levels: BB, Bb and bb

coatcolor

Factor with levels: CC, Cc and cc

Observed

a numeric vector that holds the frequencies.

Details

The data are reviewed in detail in Fisher (1936). For a brief discussion, and references to work that revisits Fisher's conclusions, see Weir (1996).

Source

Data are from Mendel (1886), and are reproduced in Fisher (1936) and Weir (1996).

References

1. Fisher, R.A. 1936. Has Mendel's work been rediscovered? Annals of Science 1:115-137.

2. Mendel, G. 1886. Versuche uber Pflanzen-Hybriden. Verhandlugen des Naturforschenden Vereines in Brunn 4:3-47. (An English translation. with annotations, is available from http://www.esp.org/foundations/genetics/classical/gm-65.pdf NB also the English translation by Royal Horticultural Society of London, reprinted in Peters, J.A. 1959. Classic Papers in Genetics. Prentice-Hall.)

3. Weir, B.S. 1996. Genetic Data Analysis II. Sinauer.

Examples

## Lay table out as a 3D array, as in Fisher (1936)
abc <- aperm(array(mendelABC[,4], dim=c(3,3,3)), c(1,3,2))
dimnames(abc) <- list(B=c('BB','Bb','bb'), 
                      A=c('AA','Aa','aa'),
                      C=c('CC','Cc','cc'))
abc
## Fit Hardy-Weinberg disequilibium model
hwde(mendelABC, loci=c("seedshape","cotylcolor","coatcolor"))
--

Dataset imported from https://www.r-project.org.

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