S3 method to plot objects of the class
a required object of class
an optional numeric, integer-valued and greater than or equal to 2, giving the level of comparison of the S-index and the overall Fechnerian distance G.
further arguments to be passed to or from other methods. They are ignored in this function.
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.
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
plot.fechner stops with an error message.
If the arguments
level are of required types,
and if there are (off-diagonal) pairs of stimuli with geodesic loops
containing at least
a plot, and invisibly returns
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
summary.fechner, the S3
method for summarizing objects of the class
creates objects of the class
print.summary.fechner, the S3 method for printing
objects of the class
the main function for Fechnerian scaling, which creates objects of
fechner. See also
for general information about this package.
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