heads.data {BHH2} | R Documentation |

## Machine heads data

### Description

Data set of the variability of machine heads in a quality improvement experiment.

### Usage

`data(heads.data)`

### Format

A data frame with 30 observations on the following 6 variables.

- obs
numeric. Observation number.

- periods
factor. Periods factor (P1, ..., P6).

- heads
factor. Type of head factor (H1, ..., H5).

- days
factor. Day factor (D1 and D2).

- shifts
factor. Shift factor (S1, S2, and S3).

- resp
numeric. Response.

### Source

Box, G. E. P. (1993). "How to Get Lucky".
*Quality Engineering*, Vol. 5, No. 3, pp 517-524.

### References

Box G. E. P, Hunter, J. S. and Hunter, W. C. (2005).
*Statistics for Experimenters II*. New York: Wiley.

### Examples

```
data(heads.data)
str(heads.data)
plot(heads.data)
```

[Package

*BHH2* version 2016.05.31

Index]