Description Usage Arguments Author(s) See Also Examples

These are Rasch model plot methods for item response functions, item inforamtion functions, item error functions, the test response function, the test information function, and the test error function, where each applies to an object of the corresponding class. `plot.ifile`

summarizes the items within an ifile by plotting each of these functions in succession.

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 | ```
## S3 method for class 'ifile'
plot(x, theta = seq(-4, 4, length = 100),
subset = 1:nrow(x), ...)
## S3 method for class 'rirf'
plot(x, theta = x$theta, add = FALSE,
xlab = expression(theta), ylab = "P(X)", main = "IRF",
lwd = 2, col = "r", ...)
## S3 method for class 'riif'
plot(x, theta = x$theta, add = FALSE,
xlab = expression(theta), ylab = "Information", main = "IIF",
lwd = 2, col = "r", ...)
## S3 method for class 'rief'
plot(x, theta = x$theta, add = FALSE,
xlab = expression(theta), ylab = "Standard Error",
main = "IEF", lwd = 2, col = "r", ...)
## S3 method for class 'rtrf'
plot(x, theta = x$theta, xlab = expression(theta),
ylab = "Total", main = "TRF", lwd = 2, ...)
## S3 method for class 'rtif'
plot(x, theta = x$theta, xlab = expression(theta),
ylab = "Information", main = "TIF", lwd = 2, ...)
## S3 method for class 'rtef'
plot(x, theta = x$theta, xlab = expression(theta),
ylab = "Standard Error", main = "TEF", lwd = 2, ...)
``` |

`x` |
for |

`theta` |
optional vector of theta values over which the functions will be evaluated |

`subset` |
an index vector indicating the items to plot, as row numbers or item names if present in the ifile |

`xlab` |
the x-axis label, as a string, defaulting to |

`ylab` |
the y-axis label, as a string, with default depending on the method |

`main` |
the plot title, with default depending on the method |

`lwd` |
line width, as an integer, defaulting to 2 |

`col` |
vector of line colors, where the default |

`add` |
boolean, with default |

`...` |
Further arguments passed to |

Anthony Albano tony.d.albano@gmail.com

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