categorize: no visible global function definition for ‘quantile’
drawImage: no visible global function definition for ‘par’
drawImage: no visible global function definition for ‘strwidth’
drawImage: no visible global function definition for ‘image’
drawImage: no visible global function definition for ‘axis’
drawImage: no visible global function definition for ‘box’
drawImage: no visible global function definition for ‘abline’
drawImageMargin: no visible global function definition for ‘par’
drawImageMargin: no visible global function definition for ‘layout’
drawImageMargin: no visible global function definition for ‘strwidth’
drawImageMargin: no visible global function definition for ‘image’
drawImageMargin: no visible global function definition for ‘axis’
drawImageMargin: no visible global function definition for ‘box’
drawImageMargin: no visible global function definition for ‘abline’
drawImageMargin: no visible global function definition for ‘lm’
drawImageMargin: no visible binding for global variable ‘na.exclude’
drawImageMargin: no visible global function definition for ‘predict’
drawImageMargin: no visible global function definition for ‘segments’
drawImageMargin: no visible global function definition for ‘gray’
drawImageMargin: no visible global function definition for ‘points’
drawImageMargin: no visible global function definition for ‘text’
mvtsplot: no visible global function definition for ‘colorRampPalette’
mvtsplot: no visible global function definition for ‘brewer.pal’
nalines: no visible global function definition for ‘gray’
nalines: no visible global function definition for ‘complete.cases’
nalines: no visible global function definition for ‘lines’
rangeby: no visible global function definition for ‘complete.cases’
splineFillIn: no visible global function definition for ‘lm’
splineFillIn: no visible binding for global variable ‘na.exclude’
splineFillIn: no visible global function definition for ‘predict’
Undefined global functions or variables:
  abline axis box brewer.pal colorRampPalette complete.cases gray image
  layout lines lm na.exclude par points predict quantile segments
  strwidth text
Consider adding
  importFrom("grDevices", "colorRampPalette", "gray")
  importFrom("graphics", "abline", "axis", "box", "image", "layout",
             "lines", "par", "points", "segments", "strwidth", "text")
  importFrom("stats", "complete.cases", "lm", "na.exclude", "predict",
             "quantile")
to your NAMESPACE file.