err.default: no visible global function definition for 'prediction'
err.default: no visible global function definition for 'performance'
err.default: no visible global function definition for 'sd'
err.default: no visible global function definition for 'mad'
err.default: no visible global function definition for 'median'
err.default: no visible global function definition for 'IQR'
partition.kmeans: no visible global function definition for 'kmeans'
partition.tiles: no visible global function definition for 'runif'
plot.represampling: no visible global function definition for 'par'
plot.represampling: no visible global function definition for 'plot'
plot.represampling: no visible global function definition for 'rnorm'
plot.represampling: no visible global function definition for 'points'
sperrorest: no visible global function definition for 'terms'
sperrorest: no visible binding for global variable 'predict'
summary.sperroresterror : <anonymous>: no visible global function
  definition for 'sd'
summary.sperroresterror : <anonymous>: no visible global function
  definition for 'median'
summary.sperroresterror : <anonymous>: no visible global function
  definition for 'IQR'
summary.sperroresterror : <anonymous> : <anonymous>: no visible global
  function definition for 'weighted.mean'
summary.sperroresterror: no visible binding for global variable 'sd'
summary.sperroresterror: no visible binding for global variable
  'median'
summary.sperroresterror: no visible binding for global variable 'IQR'
summary.sperrorestimportance: no visible binding for global variable
  'sd'
summary.sperrorestimportance: no visible binding for global variable
  'median'
summary.sperrorestimportance: no visible binding for global variable
  'IQR'
summary.sperrorestpoolederror: no visible binding for global variable
  'sd'
summary.sperrorestpoolederror: no visible binding for global variable
  'median'
summary.sperrorestpoolederror: no visible binding for global variable
  'IQR'
Undefined global functions or variables:
  IQR kmeans mad median par performance plot points predict prediction
  rnorm runif sd terms weighted.mean
Consider adding
  importFrom("graphics", "par", "plot", "points")
  importFrom("stats", "IQR", "kmeans", "mad", "median", "predict",
             "rnorm", "runif", "sd", "terms", "weighted.mean")
to your NAMESPACE file.