.onAttach: no visible global function definition for
  ‘packageDescription’
ATEbounds: no visible global function definition for ‘terms’
ATEbounds: no visible global function definition for ‘model.frame’
ATEbounds: no visible global function definition for ‘model.matrix’
ATEbounds: no visible global function definition for ‘model.response’
ATEbounds: no visible global function definition for ‘boot’
ATEcluster: no visible global function definition for ‘weighted.mean’
ATEcluster: no visible binding for global variable ‘var’
ATEcluster: no visible global function definition for ‘cov’
ATEcluster: no visible global function definition for ‘var’
ATEnocov: no visible global function definition for ‘var’
CACEcluster : cov.internal: no visible global function definition for
  ‘cov’
CACEcov: no visible global function definition for ‘model.matrix’
CACEcov: no visible global function definition for ‘fitted’
CACEcov: no visible global function definition for ‘lm’
CACEcov: no visible global function definition for ‘coef’
CACEcov: no visible global function definition for ‘vcov’
CACEnocov: no visible global function definition for ‘cov’
CACEnocov: no visible global function definition for ‘var’
CACEnocov: no visible binding for global variable ‘cov’
NIbprobit: no visible global function definition for ‘terms’
NIbprobit: no visible global function definition for ‘model.frame’
NIbprobit: no visible global function definition for ‘model.matrix’
NIbprobit: no visible global function definition for ‘model.response’
NIbprobit: no visible global function definition for ‘complete.cases’
NIbprobit: no visible global function definition for ‘rbinom’
NInocov: no visible global function definition for ‘qnorm’
Noncomp.mom: no visible global function definition for ‘na.omit’
Noncomp.mom: no visible global function definition for ‘var’
NoncompLI: no visible global function definition for ‘model.frame’
NoncompLI: no visible global function definition for ‘model.matrix’
NoncompLI: no visible global function definition for ‘model.response’
NoncompLI: no visible global function definition for ‘rnorm’
NoncompLI: no visible global function definition for ‘runif’
NoncompMAR: no visible global function definition for ‘model.frame’
NoncompMAR: no visible global function definition for ‘model.matrix’
NoncompMAR: no visible global function definition for ‘model.response’
NoncompMAR: no visible global function definition for ‘na.omit’
NoncompMAR: no visible global function definition for ‘rbinom’
boundsCI: no visible global function definition for ‘quantile’
boundsComp: no visible global function definition for ‘weighted.mean’
boundsComp: no visible global function definition for ‘qnorm’
covCluster: no visible global function definition for ‘var’
print.randomize: no visible global function definition for ‘ftable’
print.randomize: no visible global function definition for ‘na.omit’
print.summary.NoncompMAR: no visible global function definition for
  ‘printCoefmat’
randomize: no visible global function definition for ‘terms’
randomize: no visible global function definition for ‘model.frame’
randomize: no visible binding for global variable ‘na.fail’
randomize: no visible global function definition for ‘model.matrix’
randomize: no visible global function definition for ‘mahalanobis’
randomize: no visible global function definition for ‘var’
randomize: no visible global function definition for ‘quantile’
summary.NoncompMAR: no visible binding for global variable ‘sd’
summary.NoncompMAR: no visible binding for global variable ‘quantile’
weighted.var: no visible global function definition for ‘weighted.mean’
Undefined global functions or variables:
  boot coef complete.cases cov fitted ftable lm mahalanobis model.frame
  model.matrix model.response na.fail na.omit packageDescription
  printCoefmat qnorm quantile rbinom rnorm runif sd terms var vcov
  weighted.mean
Consider adding
  importFrom("stats", "coef", "complete.cases", "cov", "fitted",
             "ftable", "lm", "mahalanobis", "model.frame",
             "model.matrix", "model.response", "na.fail", "na.omit",
             "printCoefmat", "qnorm", "quantile", "rbinom", "rnorm",
             "runif", "sd", "terms", "var", "vcov", "weighted.mean")
  importFrom("utils", "packageDescription")
to your NAMESPACE file.