hoa: helicopter – R documentation

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Documentation

hoa

helicopter

Helicopter Data

Description

The helicopter data frame has 9 rows and 6 columns.

Experimental design for studying the influences of the factors wing length and wing width on a paper helicopter's flight time. The goal is to find the factor setting that maximizes flight time when the paper helicopter is dropped from a fixed height of 15.5 feet

Usage

data(helicopter)

Format

A data frame with 9 observations on the following 6 variables:

L: wing length in inches;
W: wing width in inches;
B: base length (always set to 3in);
H: base height (always set to 2in);
Order: run order;
Time: flight time in seconds.

Source

The data were obtained from

Annis, D. H. (2006) Rethinking the paper helicopter: Combining statistical and engineering knowledge. The American Statistician, 59, 320–326.

References

Box, G. E. P. (1992) Teaching engineers experimental design with a paper helicopter. Quality Engineering, 4, 453–459.

Examples

data(helicopter)
##
## fit model (5) of Annis (2005)
## -----------------------------
heli <- helicopter
##
heli$LW <- heli$L * heli$W
heli$S <- heli$B * heli$H + ( 2 * heli$L + 1 ) * heli$W
heli$logTime <- log( heli$Time )
heli$Y <- heli$logTime + log( heli$S ) / 2
#
heli.nlreg <- nlreg( Y ~ b0 + b1 * log( b2^2 / LW + LW ), data = heli, 
                    start = c( b0 = 6, b1 = -1, b2 = 20 ) )

hoa

Higher Order Likelihood Inference

v2.1.4.1

GPL (>= 2) | file LICENCE

Authors

R port by Alessandra R. Brazzale <alessandra.brazzale@unipd.it>, following earlier work by Douglas Bates. The function tem is based on work by Anthony Davison <Anthony.Davison@epfl.ch>

Initial release

2015-08-11