Description Usage Arguments Details Value References See Also Examples

The function `rp.logistic`

plots a binary or binomial response variable
against a single covariates and creates a panel which controls the position of
a logistic curve and allows a logistic regression to be fitted to the data and
displayed on the plot.

1 2 3 4 |

`x` |
a vector of covariate values. |

`y` |
a vector of response values with two levels, or a two-column matrix whose first column is the number of ‘successes’ and the second column is the number of ‘failures’ at each covariate value. |

`xlab` |
a character variable used for the covariate axis label. |

`ylab` |
a character variable used for the response axis label. |

`panel.plot` |
a logical variable which determines whether the plot is placed inside the control panel. |

`panel` |
a logical variable which determines whether an interactive panel is created. |

`hscale, vscale` |
horizontal and vertical scaling factors for the size of the plots. It can be useful to adjust these for projection on a screen, for example. The default values are 1 on Unix platforms and 1.4 on Windows platforms. |

`alpha` |
the initial value of the intercept parameter. |

`beta` |
the initial value of the slope parameter. |

`display` |
the initial settings of the checkboxes which control whether the data are ‘jittered’ for visual effect and whether the movable and fitted regression lines are displayed. |

The control panel allows a logistic regression line to be drawn on the plot and the intercept and slope of the linear predictor altered interactively. The fitted logistic regression can also be displayed.

If `y`

is a vector of responses with two values, these are treated as a factor which is then converted to the (0,1) scale by `as.numeric`

.

The values of the response variable can be ‘jittered’.

Nothing is returned.

rpanel: Simple interactive controls for R functions using the tcltk package. Journal of Statistical Software, 17, issue 9.

1 2 3 4 | ```
## Not run:
rp.logistic(river$Temperature, river$Low)
## End(Not run)
``` |

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