binsToFrontier: no visible global function definition for 'tail'
calculateMdist: no visible global function definition for 'cov'
estimateEffects: no visible global function definition for
  'txtProgressBar'
estimateEffects: no visible global function definition for 'lm'
estimateEffects: no visible global function definition for 'coef'
estimateEffects: no visible global function definition for 'confint'
estimateEffects: no visible global function definition for
  'setTxtProgressBar'
getCutpoint: no visible global function definition for 'as.formula'
getCutpoint: no visible global function definition for 'glm'
getCutpoint: no visible global function definition for 'lm'
modelDependence: no visible global function definition for 'as.formula'
modelDependence: no visible global function definition for 'lm'
nclass.ss: no visible global function definition for 'hist'
plotEstimates: no visible global function definition for 'rgb'
plotEstimates: no visible global function definition for 'plot'
plotEstimates: no visible global function definition for 'polygon'
plotEstimates: no visible global function definition for 'lines'
plotFrontier: no visible global function definition for 'plot'
plotMeans: no visible global function definition for 'rainbow'
plotMeans: no visible global function definition for 'weighted.mean'
plotMeans: no visible global function definition for 'par'
plotMeans: no visible global function definition for 'plot'
plotMeans: no visible global function definition for 'points'
plotMeans: no visible global function definition for 'legend'
reduceVar: no visible global function definition for 'nclass.Sturges'
reduceVar: no visible global function definition for 'nclass.FD'
reduceVar: no visible global function definition for 'nclass.scott'
Undefined global functions or variables:
  as.formula coef confint cov glm hist legend lines lm nclass.FD
  nclass.Sturges nclass.scott par plot points polygon rainbow rgb
  setTxtProgressBar tail txtProgressBar weighted.mean
Consider adding
  importFrom("grDevices", "nclass.FD", "nclass.Sturges", "nclass.scott",
             "rainbow", "rgb")
  importFrom("graphics", "hist", "legend", "lines", "par", "plot",
             "points", "polygon")
  importFrom("stats", "as.formula", "coef", "confint", "cov", "glm",
             "lm", "weighted.mean")
  importFrom("utils", "setTxtProgressBar", "tail", "txtProgressBar")
to your NAMESPACE file.