KEYBOARDS | R Documentation |

The design of the keyboard might have effect on the speed of
typing or on the number of typing `errors`

. Noisy factors
are `typist`

or type of `job`

. Letters A, B, C, D of
variable `keyboard`

denote the designs.

data(KEYBOARDS)

A data frame with 25 observations on the following 4 variables.

`typist`

The typist, a factor with levels

`1`

`2`

`3`

`4`

`5`

`job`

The type of job, a factor with levels

`1`

`2`

`3`

`4`

`5`

`keyboard`

Keyboard design, a factor with levels

`A`

`B`

`C`

`D`

`E`

`errors`

Number of typing errors, a numeric vector

Kenett, R. and Zacks, S. (1998)
*Modern Industrial Statistics: The Design and Control of Quality and Reliability*.
Duxbury Press.

data(KEYBOARDS) boxplot(errors ~ keyboard, data=KEYBOARDS, ylab="Errors")

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