R: Paper Helicopter Data

heli {rsm} | R Documentation

## Paper Helicopter Data

### Description

A central composite design with 4 factors in 2 blocks. These data comprise a `coded.data` object.

### Usage

    heli

### Format

A data frame with 30 observations on the following 7 variables. Each observation reflects the results of 10 replicated flights under the same experimental conditions.

`block`

  a factor with levels `1` `2`. Block 1 consists of 18 observations (a full factorial plus two center points). Block 2 consists of 12 observations – 8 axis points and 4 center points.

`x1`

  a numeric vector. Coded wing area, `x1 ~ (A - 12.4)/.6`

`x2`

  a numeric vector. Coded length ratio, `x2 ~ (R - 2.52)/.26`

`x3`

  a numeric vector. Coded body width, `x3 ~ (W - 1.25)/.25`

`x4`

  a numeric vector. Coded body length, `x4 ~ (L - 2)/.5`

`ave`

  a numeric vector. Average flight time, in csec.

`logSD`

  a numeric vector. 100*log(SD of times).

### Source

Table 12.5 of Box, GEP, Hunter, JS, and Hunter, WG (2005) Statistics for Experimenters (2nd ed.), Wiley.

[Package rsm version 2.9 Index]