Description Usage Arguments Details Value Author(s) References See Also

Main effects plots and interaction plots are produced. The other documented functions are not intended for users.

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 | ```
MEPlot(obj, ...)
## S3 method for class 'design'
MEPlot(obj, ..., response = NULL)
## Default S3 method:
MEPlot(obj, main = paste("Main effects plot for", respnam),
pch = 15, cex.xax = par("cex.axis"), cex.yax = cex.xax, mgp.ylab = 4,
cex.title = 1.5, cex.main = par("cex.main"),
lwd = par("lwd"), abbrev = 3, select = NULL, ...)
IAPlot(obj, ...)
## S3 method for class 'design'
IAPlot(obj, ..., response = NULL)
## Default S3 method:
IAPlot(obj, main = paste("Interaction plot matrix for", respnam),
pch = c(15, 17), cex.lab = par("cex.lab"), cex = par("cex"),
cex.xax = par("cex.axis"), cex.yax = cex.xax, cex.title = 1.5,
lwd = par("lwd"), abbrev = 4, select = NULL, show.alias = FALSE, ...)
intfind(i, j, mat)
check(obj)
remodel(obj)
``` |

`obj` |
an experimental design of class |

`...` |
further arguments to be passed to the default function; |

`response` |
character string that specifies response variable to be used,
must be an element of |

`main` |
overall title for the plot assembly |

`pch` |
Plot symbol number |

`cex.xax` |
size of x-axis annotation, defaults to |

`cex.yax` |
size of y-axis annotation, defaults to cex.xax |

`mgp.ylab` |
horizontal placement of label of vertical axis in |

`cex.title` |
multiplier for size of overall title (cex.main is multiplied with this factor) |

`cex.main` |
size of individual plot titles in |

`cex.lab` |
Size of variable names in diagonal panels of interaction plots
produced by |

`cex` |
size of plot symbols in interaction plots |

`lwd` |
line width for plot lines and axes |

`abbrev` |
number of characters shown for factor levels |

`select` |
vector with position numbers of the main effects to be displayed; |

`show.alias` |
if TRUE, the interaction plot shows the number
of the list entry from aliases(obj)\$aliases
(cf. |

`i` |
integer, for internal use only |

`j` |
integer, for internal use only |

`mat` |
matrix, for internal use only |

For functions `MEPlot`

or `IAPlot`

,
if `obj`

is a design with at least one response variable
rather than a linear model fit,
the `lm`

-method for class `design`

is applied to it with the
required degree (1 or 2),
and the default method for the respective function is afterwards applied to the
resulting linear model.

- MEPlot
produces plots of all main effects in the model, or selected ones if

`select`

is specified- IAPlot
produces plots of all interaction effects in the model, or selected ones if

`select`

is specified- intfind
is an internal function not directly useful for users

- check
is an internal function for checking whether the model complies with assumptions (fractional factorial of 2-level factors with full or no aliasing, not partial aliasing; this implies that Plackett-Burman designs with partial aliasing of 2-factor interactions give an OK (=TRUE) in

`check`

for pure main effects models only.)- remodel
is an internal function that redoes factor values into -1 and 1 coding, regardless of the contrasts that have been used for the original factors; numerical data are transformed by subtracting the mean and dividing by half the range (max-min), which also transforms them to -1 and 1 coding in the 2-level case (and leads to an error otherwise)

`MEPlot`

and `IAPlot`

invisibly return the plotted effects (two-row
matrix or four-row matrix, respectively). If `show.alias=TRUE`

,
the matrix returned by IAPlot has as the attribute `aliasgroups`

,
which contains all alias groups (list element number corresponds to
number in the graphics tableau).

The internal function `check`

is used within other functions for checking
whether the model is a fractional factorial with 2-level factors and
no partial aliasing, as requested for the package to work.
It is applied to remodeled objects only and returns a logical.
If the returned value is FALSE, the calling function fails.

The internal function `intfind`

returns an integer (length 1 or 0).
It is not useful for users.

The internal function `remodel`

is applied to a linear model object and
returns a list of two components:

`model ` |
is the redone model with x-variables recoded to numeric -1 and 1 notation and aov objects made into “pure” lm objects |

`labs ` |
is a list preserving the level information from original factors (levels are minus and plus for numerical variables) |

Ulrike Groemping

Box G. E. P, Hunter, W. C. and Hunter, J. S. (2005)
*Statistics for Experimenters, 2nd edition*.
New York: Wiley.

`FrF2-package`

for examples

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