| dataAnova_rbf {lessR} | R Documentation |
Data for a Randomized Block Factorial ANOVA
Description
The data for this randomized blocks factorial is a partitioning of 48 rats into 8 groups of 6 based on an initial assessment of each rat's ability to navigate a maze. That is, some rats in general do better than others. A trial maze served as a sort of a pre-test in which the rats were sorted on the basis of their ability to solve the maze. The first block of 6 rats ran the trial maze the fastest, and the last block the slowest. Within each block the rats were randomly assigned to each of the 6 treatment combinations. Each block of matched rats provides a score on each of the six treatment combinations.
This design is within-subjects because similar rats in terms of maze running ability provide the data for each block of data values. Each rat in this block only experiences one of the 6 cells, but all the rats in a block are evaluated across all 6 combinations of the levels of the two treatment variables.
Format
A data table in wide format with 48 rows of data and 4 columns: Difficulty, Dosage, Block, and Time.
Author(s)
David W. Gerbing (Portland State University; gerbing@pdx.edu)
Source
author
References
Gerbing, D. W. (later in 2022). R Data Analysis without Programming, 2nd Edition, Chapter 7, NY: Routledge.
Gerbing, D. W. (2021). Enhancement of the Command-Line Environment for use in the Introductory Statistics Course and Beyond, Journal of Statistics and Data Science Education, 29(3), 251-266, https://www.tandfonline.com/doi/abs/10.1080/26939169.2021.1999871.
Examples
d <- Read("Anova_rbf")
fit <- aov(Time ~ (Dosage*Difficulty) + Error(Block), data=d)
summary(fit)