chapter_14_table_1: The data used in Chapter 14, Table 1

Description Usage Format Details Variables Synonym Author(s) Source References Examples

Description

The data used in Chapter 14, Table 1

Usage

1

Format

An object of class data.frame with 10 rows and 4 columns.

Details

Suppose that a perceptual psychologist studying the visual system was interested in determining the extent to which interfering visual stimuli slow the ability to recognize letters. Participants are brought into a laboratory and seated in front of a tachistoscope. They are told that they will see either the letter T or the letter I displayed on the screen. In some trials, the letter appears by itself, but in other trials the target letter is embedded in a group of other letters. This variation in the display consitutes the first factor, which is referred to as noise. The noise factor has two levels - absent and present. The other factor varied by the experimenter is where in the display the target letter appears. This factor, which is called angle, also has two levels. The target letter is either shown at the center of the screen (where the participant has been told to fixate), or 8 degrees off center (with the deviation from the center randomly varying between left and right). Table 14.1 presents hypothetical data for 10 participants. As usual, the same size is kept small to minimize the computational burden. The dependent measure is reaction time (or latency) measured in milliseconds. Each participant has four scores, one for each combination of the 2x2 design. In an actual perceptual experiment, each of these four scores would itself be the mean score for that individual across a number of trials in the particular condition.

Variables

abs0

reaction time for participant without noise and at angle 0

abs8

reaction time for participant without noise and at angle 8

pres0

reaction time for participant with noise and at angle 0

pres8

reaction time for participant with noise and at angle 8

Synonym

C14T1

Author(s)

Ken Kelley [email protected]

Source

https://designingexperiments.com/data/

Maxwell, S. E., Delaney, H. D., \& Kelley, K. (forthcoming). Designing experiments and analyzing data: A model comparison perspective. (3rd ed.). Routledge.

References

Maxwell, S. E., Delaney, H. D., \& Kelley, K. (forthcoming). Designing experiments and analyzing data: A model comparison perspective (3rd ed.). Routledge.

Examples

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# Load the data
data(chapter_14_table_1)

# Or, alternatively load the data as
data(C14T1)

# View the structure
str(chapter_14_table_1)

AMCP documentation built on May 30, 2017, 8:14 a.m.