This data was generated by Beckett and Diaconis (1994). They generate
binary strings from rools of common thumbtacks. A 1 was recorded if the tack landed
point up and 0 was recorder if the tack landed point down. All tacks started point down.
Each tack was flicked 9 times. The data consit of 320 9-tuples. The actual data arose
from 16 "flickers" and 10 surfaces. Following Liu (1996), we treat the data as though
they came from 320 different tacks.
Usage
data(rolling)
Arguments
Format
A data frame with 320 observations on the following 2 variables.
y1
a numeric vector giving the number of tacks landed point up.
y2
a numeric vector giving the number of trials.
References
Liu, J.S. (1996). Nonparametric Hierarchical Bayes via Sequential Imputations.
The Annals of Statistics, 24: 911-930.