eba (version 1.4-2)

weights: Weights Judging Data

Description

Fifty subjects were presented with all 20 ordered pairs of bottles filled with lead shot and asked to choose the bottle that felt heavier. The weight of the bottles was 90, 95, 100, 105, and 110 grams, respectively. Choice frequencies were aggregated across subjects for the two within-pair presentation orders.

Usage

data(weights)

source

Davidson, R.R., & Beaver, R.J. (1977). On extending the Bradley-Terry model to incorporate within-pair order effects. Biometrics, 33, 693--702.

Examples

data(weights)
# 6 subjects chose 90g over 100g, when 90g was presented first.
weights["90g", "100g", "order1"]

# 44 subjects chose 100g over 90g, when 90g was presented first.
weights["100g", "90g", "order1"]

# 14 subjects chose 90g over 100g, when 90g was presented second.
weights["90g", "100g", "order2"]

# 36 subjects chose 100g over 90g, when 90g was presented second.
weights["100g", "90g", "order2"]