detect_lin_dep, is.pconsecutive, is.pbalanced, make.pconsecutive, make.pbalanced, within_intercept,
plm.data, pdata.frame, between, Between, Within, lag, lead, pFormula, pmodel.response,
punbalancedness, purtest, cipstest, vcovBK, vcovSCC, r.squared, has.intercept,
index, fixef, vcovHC, vcovDC, vcovNW, vcovG, piest, aneweytest, pwaldtest)
import("Formula") # import whole package
importFrom("sandwich", "vcovHC") # import generic and associated methods so the vcovHC methods from pkg sandwich and plm do no mask each other
importFrom("zoo", "index")       # --- same ---
importFrom("nlme", "fixef")      # --- same ---
# S3method("[", "pseries") # not implemented (yet)

index, fixef, ranef, vcovHC, vcovDC, vcovNW, vcovG, piest, aneweytest, pwaldtest,
maxLik # re-export maxLik::maxLik so we can place pkg 'maxLik' in 'Imports' rather than 'Depends' as it is only needed for pldv()
# 'Suggests' is not sufficient for maxLik as it is used in an eval()-statement in pldv().
"pnorm", "dnorm", "qnorm", "pt", "pchisq", "pf", "sd", "var",
"approx", "as.formula", "coef", "coefficients", "printCoefmat",
"model.matrix", "model.response", "na.omit", "terms", "update",
importFrom("nlme", "ranef")      # --- same ---
# importFrom("car", "linearHypothesis") # pkg 'car' in 'Suggests', so do not import
# importFrom("statmod", "gauss.quad")   # pkg 'statmod' in 'Suggests', so do not import
# S3method("[", "pseries") # not implemented (yet?)

plm, pldv, pvcm, pcce, pgmm, pggls, pht, pmg, ercomp,
pbltest, pbnftest, pbgtest, pbsytest, pcdtest, pdwtest, plmtest, phtest,
pFtest, pwaldtest, pwartest, pwtest, pwfdtest, pgrangertest, purtest,
sargan, mtest, pooltest, aneweytest, cipstest,
vcovHC, vcovDC, vcovNW, vcovG, vcovBK, vcovSCC, pvcovHC,
between, Between, Within, lag, lead, pFormula,
punbalancedness, r.squared, has.intercept, detect.lindep, detect_lin_dep, is.pseries,
within_intercept, pvar, pdim, dynformula, index, fixef, ranef, cortab,
importFrom("sandwich", "vcovHC")    # import generic and associated methods so the vcovHC methods from pkg sandwich and plm do no mask each other
importFrom("zoo", "index")          # --- same ---
importFrom("nlme",                  # --- same for fixef and ranef ---
"abline", "axis", "barplot", "legend", "lines",
# groupGenric for pseries, see ?groupGeneric and files R/groupGenerics_pseries.R and tests/test_groupGenerics_pseries.R
#S3method("[",         "pseries") # not implemented yet - sketch in R/pdata.frame.R