has part has_specified_input has_specified_output achieves_planned_objective data transformation statistical model linear regression for analysis of continuous dependent variable homoskedasticity test equal variance testing objective Breusch-Pagan test Alejandra Gonzalez-Beltran Breusch, T. S. and Pagan, A. R. (1979) A simple test for heteroscedasticity and random coefficient variation. Econometrica 47, 1287--1294. and adapted from: http://www.inside-r.org/packages/cran/car/docs/ncvTest last accessed [2014-03-15] Breusch-Pagan test is a statistical test which computes a score test of the hypothesis of constant error variance against the alternative that the error variance changes with the level of the response (fitted values), or with a linear combination of predictors. Orlaith Burke Philippe Rocca-Serra http://hosho.ees.hokudai.ac.jp/~kubo/Rdoc/library/lmtest/html/bptest.html bptest(formula, varformula = NULL, studentize = TRUE, data = list()) or http://www.inside-r.org/packages/cran/car/docs/ncvTest p-value ready for release