discard: no visible global function definition for ‘whatif’
distance2GAMcauchit: no visible global function definition for ‘gam’
distance2GAMcauchit: no visible global function definition for
  ‘binomial’
distance2GAMcauchit: no visible binding for global variable ‘cauchit’
distance2GAMcauchit: no visible global function definition for ‘fitted’
distance2GAMcloglog: no visible global function definition for ‘gam’
distance2GAMcloglog: no visible global function definition for
  ‘binomial’
distance2GAMcloglog: no visible binding for global variable ‘cloglog’
distance2GAMcloglog: no visible global function definition for ‘fitted’
distance2GAMlog: no visible global function definition for ‘gam’
distance2GAMlog: no visible global function definition for ‘binomial’
distance2GAMlog: no visible global function definition for ‘fitted’
distance2GAMlogit: no visible global function definition for ‘gam’
distance2GAMlogit: no visible global function definition for ‘binomial’
distance2GAMlogit: no visible binding for global variable ‘logit’
distance2GAMlogit: no visible global function definition for ‘fitted’
distance2GAMprobit: no visible global function definition for ‘gam’
distance2GAMprobit: no visible global function definition for
  ‘binomial’
distance2GAMprobit: no visible binding for global variable ‘probit’
distance2GAMprobit: no visible global function definition for ‘fitted’
distance2cauchit: no visible global function definition for ‘glm’
distance2cauchit: no visible global function definition for ‘binomial’
distance2cauchit: no visible binding for global variable ‘cauchit’
distance2cauchit: no visible global function definition for ‘fitted’
distance2cloglog: no visible global function definition for ‘glm’
distance2cloglog: no visible global function definition for ‘binomial’
distance2cloglog: no visible binding for global variable ‘cloglog’
distance2cloglog: no visible global function definition for ‘fitted’
distance2linear.cloglog: no visible global function definition for
  ‘glm’
distance2linear.cloglog: no visible global function definition for
  ‘binomial’
distance2linear.cloglog: no visible binding for global variable
  ‘cloglog’
distance2linear.cloglog: no visible global function definition for
  ‘predict’
distance2linear.log: no visible global function definition for ‘glm’
distance2linear.log: no visible global function definition for
  ‘binomial’
distance2linear.log: no visible global function definition for
  ‘predict’
distance2linear.logit: no visible global function definition for ‘glm’
distance2linear.logit: no visible global function definition for
  ‘binomial’
distance2linear.logit: no visible binding for global variable ‘logit’
distance2linear.logit: no visible global function definition for
  ‘predict’
distance2linear.probit: no visible global function definition for ‘glm’
distance2linear.probit: no visible global function definition for
  ‘binomial’
distance2linear.probit: no visible binding for global variable ‘probit’
distance2linear.probit: no visible global function definition for
  ‘predict’
distance2linearcauchit: no visible global function definition for ‘glm’
distance2linearcauchit: no visible global function definition for
  ‘binomial’
distance2linearcauchit: no visible binding for global variable
  ‘cauchit’
distance2linearcauchit: no visible global function definition for
  ‘predict’
distance2log: no visible global function definition for ‘glm’
distance2log: no visible global function definition for ‘binomial’
distance2log: no visible global function definition for ‘fitted’
distance2logit: no visible global function definition for ‘glm’
distance2logit: no visible global function definition for ‘binomial’
distance2logit: no visible binding for global variable ‘logit’
distance2logit: no visible global function definition for ‘fitted’
distance2mahalanobis: no visible global function definition for
  ‘model.matrix’
distance2nnet: no visible global function definition for ‘nnet’
distance2nnet: no visible global function definition for ‘fitted’
distance2probit: no visible global function definition for ‘glm’
distance2probit: no visible global function definition for ‘binomial’
distance2probit: no visible binding for global variable ‘probit’
distance2probit: no visible global function definition for ‘fitted’
distance2rpart: no visible global function definition for ‘rpart’
distance2rpart: no visible global function definition for ‘predict’
eqqplot: no visible global function definition for ‘approx’
eqqplot: no visible global function definition for ‘plot’
help.matchit: no visible global function definition for ‘browseURL’
hist.pscore: no visible global function definition for ‘par’
hist.pscore: no visible global function definition for ‘na.omit’
hist.pscore: no visible global function definition for ‘hist’
hist.pscore: no visible global function definition for ‘abline’
jitter.pscore: no visible global function definition for ‘plot’
jitter.pscore: no visible global function definition for ‘abline’
jitter.pscore: no visible global function definition for ‘points’
jitter.pscore: no visible global function definition for ‘axis’
jitter.pscore: no visible global function definition for ‘text’
jitter.pscore: no visible global function definition for ‘na.omit’
jitter.pscore: no visible global function definition for ‘box’
jitter.pscore: no visible global function definition for ‘identify’
match.data: no visible global function definition for ‘terms’
matchit: no visible global function definition for ‘model.frame’
matchit: no visible global function definition for ‘terms’
matchit: no visible global function definition for ‘model.response’
matchit: no visible global function definition for ‘model.matrix’
matchit.qqplot: no visible global function definition for ‘formula’
matchit.qqplot: no visible global function definition for
  ‘model.matrix’
matchit.qqplot: no visible global function definition for ‘par’
matchit.qqplot: no visible global function definition for ‘plot’
matchit.qqplot: no visible global function definition for ‘mtext’
matchit.qqplot: no visible global function definition for ‘strwidth’
matchit.qqplot: no visible global function definition for ‘text’
matchit.qqplot: no visible global function definition for ‘abline’
matchit.qqplot: no visible global function definition for ‘axis’
matchit.qqplot: no visible global function definition for ‘box’
matchit2cem: no visible global function definition for ‘cem’
matchit2full: no visible global function definition for ‘fullmatch’
matchit2genetic: no visible global function definition for ‘GenMatch’
matchit2nearest: no visible global function definition for ‘var’
matchit2nearest: no visible global function definition for ‘na.omit’
matchit2nearest: no visible global function definition for
  ‘mahalanobis’
matchit2optimal: no visible global function definition for ‘fullmatch’
matchit2subclass: no visible global function definition for ‘na.omit’
matchit2subclass: no visible global function definition for ‘quantile’
plot.summary.matchit: no visible global function definition for ‘par’
plot.summary.matchit: no visible global function definition for ‘plot’
plot.summary.matchit: no visible global function definition for
  ‘abline’
plot.summary.matchit: no visible global function definition for ‘axis’
plot.summary.matchit: no visible global function definition for
  ‘points’
plot.summary.matchit: no visible global function definition for ‘mtext’
plot.summary.matchit: no visible global function definition for
  ‘identify’
qoi : weighted.var: no visible global function definition for
  ‘weighted.mean’
qoi: no visible global function definition for ‘sd’
qoi: no visible global function definition for ‘weighted.mean’
qoi.by.sub: no visible global function definition for ‘sd’
qqsum: no visible global function definition for ‘ecdf’
qqsum: no visible global function definition for ‘approx’
qqsum: no visible global function definition for ‘median’
summary.matchit: no visible global function definition for ‘formula’
summary.matchit: no visible global function definition for
  ‘model.matrix’
summary.matchit.subclass: no visible global function definition for
  ‘formula’
summary.matchit.subclass: no visible global function definition for
  ‘model.matrix’
weights.matrix: no visible global function definition for ‘na.omit’
weights.subclass: no visible global function definition for ‘na.omit’
Undefined global functions or variables:
  GenMatch abline approx axis binomial box browseURL cauchit cem
  cloglog ecdf fitted formula fullmatch gam glm hist identify logit
  mahalanobis median model.frame model.matrix model.response mtext
  na.omit nnet par plot points predict probit quantile rpart sd
  strwidth terms text var weighted.mean whatif
Consider adding
  importFrom("graphics", "abline", "axis", "box", "hist", "identify",
             "mtext", "par", "plot", "points", "strwidth", "text")
  importFrom("stats", "approx", "binomial", "ecdf", "fitted", "formula",
             "glm", "mahalanobis", "median", "model.frame",
             "model.matrix", "model.response", "na.omit", "predict",
             "quantile", "sd", "terms", "var", "weighted.mean")
  importFrom("utils", "browseURL")
to your NAMESPACE file.