On this R-data statistics page, you will find information about the toothpaste data set which pertains to Toothpaste Data . The toothpaste data set is found in the HSAUR R package. You can load the toothpaste data set in R by issuing the following command at the console data("toothpaste"). This will load the data into a variable called toothpaste. If R says the toothpaste data set is not found, you can try installing the package by issuing this command install.packages("HSAUR") 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 toothpaste R data set. The size of this file is about 314 bytes.

Toothpaste Data

Description

Meta-analysis of studies comparing two different toothpastes.

Usage

data("toothpaste")

Format

A data frame with 9 observations on the following 7 variables.

Study

the identifier of the study.

nA

number of subjects using toothpaste A.

meanA

mean DMFS index of subjects using toothpaste A.

sdA

standard deviation of DMFS index of subjects using toothpaste A.

nB

number of subjects using toothpaste B.

meanB

mean DMFS index of subjects using toothpaste B.

sdB

standard deviation of DMFS index of subjects using toothpaste B.

Details

The data are the results of nine randomised trials comparing two different toothpastes for the prevention of caries development. The outcomes in each trial was the change, from baseline, in the decayed, missing (due to caries) and filled surface dental index (DMFS).

Source

B. S. Everitt and A. Pickles (2000), Statistical Aspects of the Design and Analysis of Clinical Trials, Imperial College Press, London.

Examples

  data("toothpaste", package = "HSAUR")
  toothpaste

--

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