The hier.part package for R is an implementation of the hierarchical partitioning algorithm published by Chevan and Sutherland (1991: The American Statistician 45: 90). The function hier.part() partitions the independent and joint contributions of each predictor in a multivariate data set to a linear model by hierarchical decomposition of goodness-of-fit measures of regressions. It uses goodness-of-fit measures for the full hierarchy of models based on N predictors (i.e., model (1), (2), …, (N), (1,2), …, (1,N), …, (1,2,3,…,N)). The function rand.hp() performs a randomization test that allows an Z-score assessment of the ‘importance’ of each predictor in explaining variation in the response variable.
The current version on CRAN is 1.0-5 (commit 8f8865da6a). A beta version of 1.0-6 (minor corrections) on github
Through CRAN or:
#logistic regression of an amphipod species occurrence in streams against #four independent variables describing catchment characteristics #(from Walsh et al (2004) Biodiversity and Conservation 13:781) data(amphipod) env <- amphipod[,2:5] hier.part(amphipod$australis, env, fam = "binomial", gof = "logLik") # shows that fconn (drainage connection) is the strongest independent # predictor explaining amphipod occurrence (having elsewhere tested # that the model predicts occurrence well). rand.hp(amphipod$australis, env, fam = "binomial", gof = "logLik", num.reps = 999)$Iprobs #Z-scores suggest that fconn and fimp (imperviousness) are both #important' independent predictors of amphipod abundance. #(999 randomizations takes a few minutes).
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