AMCP (version 2.0.0)

chapter_3_table_3: The data used in Chapter 3, Table 3

Description

The data used in Chapter 3, Table 3.

Usage

data(chapter_3_table_3)

Format

An object of class data.frame with 30 rows and 2 columns.

Variables

Condition

assigned Condition: a numeric vector (1=Pleasant/elated, 2=Neutral, 3=Unpleasant/depressed)

Rating

a numeric vector between 1 and 7

Synonym

C3T3

Author

Ken Kelley

Details

Although different mood states have, of course, always been of interest to clinicians, recent years have seen a profusion of studies attempting to manipulate mood states in controlled laboratory studies. In such induced-mood research, participants typically are randomly assigned to one of three groups: a depressed-mood induction, a neutral-mood induction, or an elated-mood induction. One study (Pruitt, 1988) used selected video clips from several movies and public television programs as the mood-induction treatments. After viewing the video for her assigned condition, each participant was asked to indicate her mood on various scales. In addition, each subject was herself videotaped, and her facial expressions of emotion were rated on a scale of 1 to 7 (1 indicating sad; 4, neutral; and 7, happy) by an assistant who viewed the videotapes but was kept "blind" regarding the subjects' assigned conditions.

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_3_table_3)

# Or, alternatively load the data as
data(C3T3)

# View the structure
str(chapter_3_table_3)

# ---------------------------------------------------------------------
# Optional: a factor-coded copy for ANOVA / model-comparison analyses.
# Condition is stored as a numeric code so the book's contrast and
# model-comparison examples reproduce exactly. For a one-way ANOVA you
# generally want it as a factor; otherwise the code enters the model as a
# single linear (1 df) term. Build a *copy* (suffix "_factors") so the
# canonical data set is left unchanged. Labels are taken from the
# "Variables" section above.
C3T3_factors <- chapter_3_table_3
C3T3_factors$Condition <- factor(C3T3_factors$Condition, levels = 1:3,
  labels = c("Pleasant/Elated", "Neutral", "Unpleasant/Depressed"))

# The coding matters: numeric code (1 df) versus factor (2 df).
anova(lm(Rating ~ Condition, data = chapter_3_table_3))
anova(lm(Rating ~ Condition, data = C3T3_factors))