autocorr : ac: no visible global function definition for 'cor'
balance: no visible global function definition for 'par'
balance : <anonymous>: no visible global function definition for 'sd'
balance: no visible global function definition for 'density'
balance: no visible global function definition for 'rgb'
balance: no visible global function definition for 'abline'
balance: no visible global function definition for 'gray'
balance: no visible global function definition for 'segments'
balance: no visible global function definition for 'mtext'
balance: no visible global function definition for 'lines'
balance: no visible global function definition for 'text'
balance: no visible global function definition for 'quantile'
balance: no visible global function definition for 'axis'
balance: no visible global function definition for 'legend'
control.overlap: no visible global function definition for 'par'
control.overlap: no visible global function definition for 'segments'
control.overlap: no visible global function definition for 'points'
control.overlap: no visible global function definition for 'axis'
control.overlap: no visible global function definition for 'mtext'
effect: no visible global function definition for 'par'
effect: no visible global function definition for 'rgb'
effect: no visible global function definition for 'density'
effect: no visible global function definition for 'abline'
effect: no visible global function definition for 'gray'
effect: no visible global function definition for 'lines'
effect: no visible global function definition for 'text'
effect: no visible global function definition for 'quantile'
effect: no visible global function definition for 'mtext'
sensitivity: no visible global function definition for 'par'
sensitivity : <anonymous>: no visible global function definition for
  'quantile'
sensitivity: no visible global function definition for 'axis'
sensitivity: no visible global function definition for 'abline'
sensitivity: no visible global function definition for 'gray'
sensitivity: no visible global function definition for 'rgb'
sensitivity: no visible global function definition for 'lines'
sensitivity: no visible global function definition for 'legend'
sensitivity: no visible global function definition for 'mtext'
svmmatch: no visible binding for global variable 'sd'
svmmatch : <anonymous>: no visible global function definition for 'sd'
svmmatch: no visible global function definition for 'lm'
svmmatch : <anonymous>: no visible global function definition for 'lm'
treatment.overlap: no visible global function definition for 'par'
treatment.overlap: no visible global function definition for 'glm'
treatment.overlap: no visible global function definition for 'rgb'
treatment.overlap: no visible global function definition for 'boxplot'
Undefined global functions or variables:
  abline axis boxplot cor density glm gray legend lines lm mtext par
  points quantile rgb sd segments text
Consider adding
  importFrom("grDevices", "gray", "rgb")
  importFrom("graphics", "abline", "axis", "boxplot", "legend", "lines",
             "mtext", "par", "points", "segments", "text")
  importFrom("stats", "cor", "density", "glm", "lm", "quantile", "sd")
to your NAMESPACE file.