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  • pR2 function fails on fully populated R object

    Hi,

    The R package, pscl, is meant for statistical analysis. The pR2 function that calculates "pseudo R-sq" has been failing with error:

    "no applicable method for 'pR2' applied to an object of class "NULL".

    I know this means that R thinks data object sent to pR2 was null, but I have proof that the glm package that created the data object produced the expected output data objects. That is, the following code works up to the call to pR2.

    *************************************
    glm_modeling <- function(formula=NULL, dataSets=NULL){
    fit_glm <- glm(formula, dataSets, family=binomial(),control=list(maxit=100))
    message(str(fit_glm))
    glm_summary <- summary(fit_glm)
    list(fit_glm, glm_summary)
    }

    [snip]

    warning_catch <- tryCatch(
    {fit_list <- glm_modeling(formula=formula1, dataSets=reg_table)
    message(dim(fit_list))
    message(length(fit_list))
    },
    error=function (e) e,
    warning=function(w) w
    )

    [snip]

    glm_fit = fit_list[[1]]
    glm_summary = fit_list[[2]]
    pv_coef <- glm_summary$coefficients

    # This call fails with error: " no applicable method for 'pR2' applied to an object of class "NULL" "
    GOF <- as.data.frame(pR2(glm_fit))
    *************************************

    I know that the glm_fit object is populated because I checked it with 'message'.

    So, has anyone else seen this behavior from the pR2 function in the pscl library? The installed pscl library is version pscl_1.4.9. Is there a later version? Any idea why pR2 would fail when given a fully populated object?

    Any help is appreciated.

    JoeW

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