diff.resamples  R Documentation 
Methods for making inferences about differences between models
## S3 method for class 'resamples' diff( x, models = x$models, metric = x$metrics, test = t.test, confLevel = 0.95, adjustment = "bonferroni", ... ) ## S3 method for class 'diff.resamples' summary(object, digits = max(3, getOption("digits")  3), ...) compare_models(a, b, metric = a$metric[1])
x 
an object generated by 
models 
a character string for which models to compare 
metric 
a character string for which metrics to compare 
test 
a function to compute differences. The output of this function
should have scalar outputs called 
confLevel 
confidence level to use for

adjustment 
any pvalue adjustment method to pass to

... 
further arguments to pass to 
object 
a object generated by 
digits 
the number of significant differences to display when printing 
a, b 
two objects of class 
The ideas and methods here are based on Hothorn et al. (2005) and Eugster et al. (2008).
For each metric, all pairwise differences are computed and tested to assess if the difference is equal to zero.
When a Bonferroni correction is used, the confidence level is changed from
confLevel
to 1((1confLevel)/p)
here p
is the number
of pairwise comparisons are being made. For other correction methods, no
such change is used.
compare_models
is a shorthand function to compare two models using a
single metric. It returns the results of t.test
on the
differences.
An object of class "diff.resamples"
with elements:
call

the call 
difs 
a list for each metric being compared. Each list contains a matrix with differences in columns and resamples in rows 
statistics 
a list of results generated by 
adjustment 
the pvalue adjustment used 
models 
a character string for which models were compared. 
metrics 
a character string of performance metrics that were used 
or...
An object of class "summary.diff.resamples"
with elements:
call

the call 
table 
a list of tables that show the differences and pvalues 
...or (for compare_models
) an object of class htest
resulting
from t.test
.
Max Kuhn
Hothorn et al. The design and analysis of benchmark experiments. Journal of Computational and Graphical Statistics (2005) vol. 14 (3) pp. 675699
Eugster et al. Exploratory and inferential analysis of benchmark experiments. LudwigsMaximiliansUniversitat Munchen, Department of Statistics, Tech. Rep (2008) vol. 30
resamples
, dotplot.diff.resamples
,
densityplot.diff.resamples
,
bwplot.diff.resamples
, levelplot.diff.resamples
## Not run: #load(url("http://topepo.github.io/caret/exampleModels.RData")) resamps < resamples(list(CART = rpartFit, CondInfTree = ctreeFit, MARS = earthFit)) difs < diff(resamps) difs summary(difs) compare_models(rpartFit, ctreeFit) ## End(Not run)
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