AMCP (version 2.0.0)

chapter_14_table_13: The data used in Chapter 14, Table 13

Description

The data used in Chapter 14, Table 13

Usage

data(chapter_14_table_13)

Format

An object of class data.frame with 300 rows and 5 columns.

Variables

id1

Participant identification number (1 to 100)

treatment

Condition indicator (0 = treatment, 1 = control)

Index1

Measurement occasion index (1, 2, or 3)

time

Time of measurement (0 = baseline, 4, or 8)

Y

Outcome score

Synonym

C14T13

Author

Ken Kelley

Details

Chapter 14 introduces longitudinal randomized designs with a hypothetical study of 100 participants, 44 of whom were randomly assigned to an active treatment condition and 56 of whom were assigned to a control group. The outcome variable is measured at baseline (time 0) and at two post-intervention occasions (times 4 and 8). Table 14.13 presents the sample means by group and time, and Table 14.14 presents the tests of the omnibus effects for these data. The same data set is analyzed with mixed-effects models in Chapter 15 (see Tables 15.15 and 15.16). The data are stored in the long ("univariate") format expected by the mixed-effects code shown in Chapter 15, with one row per participant per measurement occasion.

References

Maxwell, S. E., Delaney, H. D., & Kelley, K. (2027). Designing experiments and analyzing data: A model comparison perspective (4th ed.). New York, NY: Routledge.

Examples

# Load the data
data(chapter_14_table_13)

# Or, alternatively load the data as
data(C14T13)

# View the structure
str(chapter_14_table_13)