R Dataset / Package HistData / Pyx
On this Picostat.com statistics page, you will find information about the Pyx data set which pertains to Trial of the Pyx. The Pyx data set is found in the HistData R package. Try to load the Pyx data set in R by issuing the following command at the console data("Pyx"). This may load the data into a variable called Pyx. If R says the Pyx data set is not found, you can try installing the package by issuing this command install.packages("HistData") and then attempt to reload the data with library("HistData") followed by data("Pyx"). Perhaps strangley, if R gives you no output after entering a command, it means the command succeeded. If it succeeded you can see the data by typing Pyx at the command-line which should display the entire dataset.
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 Pyx R data set. The size of this file is about 2,373 bytes.
Trial of the Pyx
Stigler (1997, 1999) recounts the history of one of the oldest continuous schemes of sampling inspection carried out by the Royal Mint in London for about eight centuries. The Trial of the Pyx was the final, ceremonial stage in a process designed to ensure that the weight and quality of gold and silver coins from the mint met the standards for coinage.
At regular intervals, coins would be taken from production and deposited into a box called the Pyx. When a Trial of the Pyx was called, the contents of the Pyx would be counted, weighed and assayed for content, and the results would be compared with the standard set for the Royal Mint.
The data frame
A frequency data frame with 72 observations on the following 4 variables giving the
distribution of 10,000 soverigns, classified according to the
Stigler, S. M. (1999). Statistics on the Table. Cambridge, MA: Harvard University Press, table 21.1.
Great Britain (1848). "Report of the Commissioners Appointed to Inquire into the Constitution, Management and Expense of the Royal Mint." In Vol 28 of House Documents for 1849.
Stigler, S. M. (1997). Eight Centuries of Sampling Inspection: The Trial of the Pyx Journal of the American Statistical Association, 72(359), 493-500
data(Pyx) # display as table xtabs(count ~ Bags+Deviation, data=Pyx)
Dataset imported from https://www.r-project.org.
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