criterioST.cv: no visible global function definition for ‘cor’
dblm: no visible global function definition for ‘cmdscale’
dblm: no visible global function definition for ‘cor’
dblm: no visible global function definition for ‘lm’
extractFormula: no visible global function definition for ‘model.frame’
extractFormula: no visible global function definition for ‘terms’
extractFormula: no visible global function definition for ‘as’
extractFormula: no visible global function definition for
  ‘model.extract’
extractFormula: no visible global function definition for
  ‘model.matrix’
extractFormula: no visible global function definition for
  ‘delete.response’
graph.rbfST: no visible global function definition for ‘optimize’
graph.rbfST: no visible global function definition for ‘txtProgressBar’
graph.rbfST: no visible global function definition for
  ‘setTxtProgressBar’
graph.rbfST: no visible global function definition for ‘heat.colors’
idwST: no visible global function definition for ‘sd’
idwST: no visible global function definition for ‘txtProgressBar’
idwST: no visible global function definition for ‘setTxtProgressBar’
idwST.cv: no visible global function definition for ‘txtProgressBar’
idwST.cv: no visible global function definition for ‘setTxtProgressBar’
idwST.cv1: no visible global function definition for ‘txtProgressBar’
idwST.cv1: no visible global function definition for
  ‘setTxtProgressBar’
idwST.tcv: no visible global function definition for ‘txtProgressBar’
idwST.tcv: no visible global function definition for
  ‘setTxtProgressBar’
rbfST: no visible global function definition for ‘sd’
rbfST: no visible global function definition for ‘txtProgressBar’
rbfST: no visible global function definition for ‘setTxtProgressBar’
rbfST.tcv: no visible global function definition for ‘txtProgressBar’
rbfST.tcv: no visible global function definition for
  ‘setTxtProgressBar’
Undefined global functions or variables:
  as cmdscale cor delete.response heat.colors lm model.extract
  model.frame model.matrix optimize sd setTxtProgressBar terms
  txtProgressBar
Consider adding
  importFrom("grDevices", "heat.colors")
  importFrom("methods", "as")
  importFrom("stats", "cmdscale", "cor", "delete.response", "lm",
             "model.extract", "model.frame", "model.matrix", "optimize",
             "sd", "terms")
  importFrom("utils", "setTxtProgressBar", "txtProgressBar")
to your NAMESPACE file (and ensure that your DESCRIPTION Imports field
contains 'methods').