• The support for (generalized) linear model trees with just a constant regressor has been improved. Now lmtree(y ~ x1 + x2) is short for lmtree(y ~ 1 | x1 + x2), analogously for glmtree(). Plotting now also works properly in this case.
• The as.party() method for "rpart" objects did not work if one of the partitioning variables was a "character" variable rather than a "factor". A suitable work-around has been added.
• The node_barplot() panel function can now also be used for multivariate responses, e.g., when all responses are numeric and on the same scale.
• The package now also includes a new data set HuntingSpiders which is essentially a copy of the spider data from the package mvpart that is currently archived on CRAN. The documentation has been improved somewhat and is likely to change further to explain how the data has been transformed in De'ath (2002).
• The survival tree example for the GBSG2 data was broken due to the response being (incorrectly) also part of the explanatory variables. Fixed by using the latest Formula package (at least version 1.2-1).