ex1419 {Sleuth3}

Clever Hans Effect

Description

These data were simulated to match the summary statistics and conclusions of Rosenthal and Fode's Clever Hans experiment. Each of 12 students trained rats to run a maze. The data set contains their number of successful runs out of 50 on each of 5 days. It also shows two summarizing statistics for each student: the overall success rate on all 5 days and the slope in the least squares regression of daily success rate (number of successes in a day divided by 50) on day. Also included are the student's response to the prior expectation of success question and the student's response to a post- experiment question about how relaxed they felt handling their rats (with higher values corresponding to more relaxed). The treatment variable shows whether or not the students were supplied with the fictitious information about whether their rats were bright or not.

Usage

ex1419

Format

A data frame with 12 observations on the following 12 variables.

Student

a student identification number

PriorExp

the student's prior expectation of rat-training success, on a scale from -10 to 10

Block

a numerical variable for pairs of students grouped according to their values of PriorExp

Treatment

a factor with levels "bright" and "dull" corresponding to whether students were told (falsely) that their rats were bright or not

Day1

the number of successful rat mazed runs on day 1

Day2

the number of successful rat mazed runs on day 2

Day3

the number of successful rat mazed runs on day 3

Day4

the number of successful rat mazed runs on day 4

Day5

the number of successful rat mazed runs on day 5

Relax

degree of relaxation students felt in handling their rats, on a scale from 0 to 10

Success

the total proportion of successful maze runs in 5 days

Slope

the slope in the least squares regression of mean daily success as a function of day, estimated for each student individually

Source

Ramsey, F.L. and Schafer, D.W. (2013). The Statistical Sleuth: A Course in Methods of Data Analysis (3rd ed), Cengage Learning.

References

Rosenthal, R. and Fode, K.L. (1963) The Effect of Experimenter Bias on the Performance of the Albino Rat Behavioral Science 8:3: 183–189.

See Also

ex2120

Examples

                 
str(ex1419)