# yb: Youden and Beale's Data on Lesions of Half-Leaves of Tobacco... In ACSWR: A Companion Package for the Book "A Course in Statistics with R"

## Description

A simple and innovative design is often priceless. Youden and Beale (1934) sought to find the effect of two preparations of virus on tobacco plants. One half of a tobacco leaf was rubbed with cheesecloth soaked in one preparation of the virus extract and the second half was rubbed with the other virus extract. This experiment was replicated on just eight leaves, and the number of lesions on each half leaf was recorded.

## Usage

 `1` ```data(yb) ```

## Format

A data frame with 8 observations on the following 2 variables.

`Preparation_1`

a numeric vector

`Preparation_2`

a numeric vector

## References

Youden, W. J., and Beale, H. P. (1934). A Statistical Study of the Local Lesion Method for Estimating Tobacco Mosaic Virus. Contrib. Boyce Thompson Inst, 6, 437-454.

## Examples

 ```1 2 3 4 5 6``` ```data(yb) summary(yb) quantile(yb\$Preparation_1,seq(0,1,.1)) # here seq gives 0, .1, .2, ...,1 quantile(yb\$Preparation_2,seq(0,1,.1)) fivenum(yb\$Preparation_1) fivenum(yb\$Preparation_2) ```

### Example output

``` Preparation_1   Preparation_2
Min.   : 7.00   Min.   : 5.00
1st Qu.: 8.75   1st Qu.: 6.75
Median :13.50   Median :10.50
Mean   :15.00   Mean   :11.00
3rd Qu.:18.50   3rd Qu.:14.75
Max.   :31.00   Max.   :18.00
0%  10%  20%  30%  40%  50%  60%  70%  80%  90% 100%
7.0  7.7  8.4  9.1  9.8 13.5 17.2 17.9 19.2 23.3 31.0
0%  10%  20%  30%  40%  50%  60%  70%  80%  90% 100%
5.0  5.7  6.4  7.3  9.4 10.5 11.6 13.7 15.8 17.3 18.0
[1]  7.0  8.5 13.5 19.0 31.0
[1]  5.0  6.5 10.5 15.5 18.0
```

ACSWR documentation built on May 29, 2017, 8:41 p.m.