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

S3 method to plot objects of the class `fechner`

.

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`x` |
a required object of class |

`level` |
an optional numeric, integer-valued and greater than or
equal to |

`...` |
further arguments to be passed to or from other methods. They are ignored in this function. |

The `plot`

method graphs the results obtained from Fechnerian
scaling analyses. It produces a scatterplot of the overall
Fechnerian distance *G* versus the *S*-index, with rugs
added to the axes and jittered (`amount = 0.01`

of noise) to
accommodate ties in the *S*-index and *G* values. The
diagonal line *y = x* is for visual inspection of the deviations
of the two types of values.

The `level`

of comparison refers to the minimum number of links
in geodesic loops. That is, choosing level *n* means that
comparison involves only those *S*-index and *G* values that
have geodesic loops containing not less than *n* links.

If there are no (off-diagonal) pairs of stimuli with geodesic loops
containing at least `level`

links (in this case a plot is not
possible), `plot.fechner`

stops with an error message.

If the arguments `x`

and `level`

are of required types,
and if there are (off-diagonal) pairs of stimuli with geodesic loops
containing at least `level`

links, `plot.fechner`

produces
a plot, and invisibly returns `NULL`

.

Thomas Kiefer, Ali Uenlue. Based on original MATLAB source by Ehtibar N. Dzhafarov.

Dzhafarov, E. N. and Colonius, H. (2006) Reconstructing
distances among objects from their discriminability.
*Psychometrika*, **71**, 365–386.

Dzhafarov, E. N. and Colonius, H. (2007) Dissimilarity
cumulation theory and subjective metrics. *Journal of
Mathematical Psychology*, **51**, 290–304.

Uenlue, A. and Kiefer, T. and Dzhafarov, E. N.
(2009) Fechnerian scaling in **R**: The package fechner.
*Journal of Statistical Software*, **31**(6), 1–24.
URL http://www.jstatsoft.org/v31/i06/.

`print.fechner`

, the S3 method for printing objects of
the class `fechner`

; `summary.fechner`

, the S3
method for summarizing objects of the class `fechner`

, which
creates objects of the class `summary.fechner`

;
`print.summary.fechner`

, the S3 method for printing
objects of the class `summary.fechner`

; `fechner`

,
the main function for Fechnerian scaling, which creates objects of
the class `fechner`

. See also `fechner-package`

for general information about this package.

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