mu_plot {TestGardener}

Plot expected test score as a function of score index

Description

The expected score mu(index) is a function of the score index index. A diagonal dashed line is displayed to show the linear relationship to the score range interval.

Usage

mu_plot(mufine, scrrng, titlestr)

Arguments

mufine

A mesh of 101 equally spaced values of mu as a function of index.

scrrng

A vector of length 2 containing the score range.

titlestr

A string containing the title of the data.

Value

A gg or ggplot object defining the plot of the expected test score mu as a function of the score index index. This is displayed by the print command. The plot is automatically displayed as a side value even if no return object is specified in the calling statement.

Author(s)

Juan Li and James Ramsay

References

Ramsay, J. O., Li J. and Wiberg, M. (2020) Full information optimal scoring. Journal of Educational and Behavioral Statistics, 45, 297-315.

Ramsay, J. O., Li J. and Wiberg, M. (2020) Better rating scale scores with information-based psychometrics. Psych, 2, 347-360.

See Also

scoreDensity, mu