balance.classical: no visible global function definition for
  'chisq.test'
balance.classical: no visible global function definition for 'na.omit'
balance.classical: no visible global function definition for 't.test'
balance.stand.diff: no visible global function definition for
  'mahalanobis'
balance.stand.diff: no visible global function definition for 'na.omit'
balance.stand.diff: no visible global function definition for 'sd'
dist.plot.bar.plot: no visible global function definition for 'dev.new'
dist.plot.bar.plot: no visible global function definition for 'par'
dist.plot.bar.plot: no visible global function definition for
  'rainbow_hcl'
dist.plot.bar.plot: no visible global function definition for
  'heat.colors'
dist.plot.bar.plot: no visible global function definition for 'barplot'
dist.plot.bar.plot: no visible global function definition for 'mtext'
dist.plot.bar.plot: no visible global function definition for 'legend'
dist.plot.bar.plot: no visible global function definition for
  'split.screen'
dist.plot.bar.plot: no visible global function definition for 'screen'
dist.plot.bar.plot: no visible global function definition for
  'close.screen'
dist.plot.hist : func.breaks: no visible global function definition for
  'hist'
dist.plot.hist : func.counts: no visible global function definition for
  'hist'
dist.plot.hist.plot: no visible global function definition for
  'dev.new'
dist.plot.hist.plot: no visible global function definition for 'par'
dist.plot.hist.plot: no visible global function definition for
  'rainbow_hcl'
dist.plot.hist.plot: no visible global function definition for
  'heat.colors'
dist.plot.hist.plot: no visible global function definition for
  'barplot'
dist.plot.hist.plot: no visible global function definition for 'axis'
dist.plot.hist.plot: no visible global function definition for 'legend'
dist.plot.hist.plot: no visible global function definition for 'mtext'
find.factors: no visible global function definition for 'formula'
plot.pscore: no visible global function definition for 'density'
plot.pscore: no visible global function definition for 'plot'
plot.pscore: no visible global function definition for 'legend'
plot.stdf: no visible global function definition for 'rainbow_hcl'
plot.stdf: no visible global function definition for 'grey.colors'
plot.stdf: no visible global function definition for 'par'
plot.stdf: no visible global function definition for 'plot'
plot.stdf: no visible global function definition for 'points'
plot.stdf: no visible global function definition for 'axis'
plot.stdf: no visible global function definition for 'box'
plot.stdf : <anonymous>: no visible global function definition for
  'lines'
plot.stdf: no visible global function definition for 'abline'
plot.stdf: no visible global function definition for 'legend'
print.est.data.frame: no visible global function definition for 'qnorm'
print.est.matched.data.frame: no visible global function definition for
  'qnorm'
print.est.matched.pscore: no visible global function definition for
  'qnorm'
print.est.stratified.data.frame: no visible global function definition
  for 'qnorm'
print.est.stratified.pscore: no visible global function definition for
  'qnorm'
ps.estimate.bin: no visible global function definition for 'glm'
ps.estimate.bin: no visible global function definition for 'vcov'
ps.estimate.bin: no visible global function definition for
  'model.frame'
ps.estimate.bin: no visible global function definition for 'formula'
ps.estimate.data.frame: no visible global function definition for
  'formula'
ps.estimate.data.frame: no visible global function definition for
  'model.frame'
ps.estimate.data.frame: no visible global function definition for
  'model.matrix'
ps.estimate.gauss: no visible global function definition for 'glm'
ps.estimate.gauss: no visible global function definition for 'sd'
ps.estimate.gauss: no visible global function definition for 'var'
ps.estimate.gauss: no visible global function definition for 'vcov'
ps.estimate.gauss: no visible global function definition for
  'model.frame'
ps.estimate.gauss: no visible global function definition for 'formula'
ps.estimate.matched.data.frame: no visible global function definition
  for 'formula'
ps.estimate.matched.data.frame: no visible global function definition
  for 'model.frame'
ps.estimate.matched.data.frame: no visible global function definition
  for 'model.matrix'
ps.estimate.matched.pscore: no visible global function definition for
  'formula'
ps.estimate.matched.pscore: no visible global function definition for
  'model.frame'
ps.estimate.matched.pscore: no visible global function definition for
  'model.matrix'
ps.estimate.regr: no visible global function definition for 'glm'
ps.estimate.regr: no visible global function definition for 'vcov'
ps.estimate.regr: no visible global function definition for 'cov'
ps.estimate.stratified.data.frame: no visible global function
  definition for 'formula'
ps.estimate.stratified.data.frame: no visible global function
  definition for 'model.frame'
ps.estimate.stratified.data.frame: no visible global function
  definition for 'model.matrix'
ps.estimate.stratified.pscore: no visible global function definition
  for 'formula'
ps.estimate.stratified.pscore: no visible global function definition
  for 'model.frame'
ps.estimate.stratified.pscore: no visible global function definition
  for 'model.matrix'
ps.matchcaliper: no visible global function definition for 'sd'
pscore: no visible binding for global variable 'binomial'
pscore: no visible binding for global variable 'na.exclude'
pscore: no visible global function definition for 'model.frame'
pscore: no visible global function definition for 'glm'
pscore: no visible global function definition for 'predict'
relative.effect: no visible global function definition for
  'model.frame'
relative.effect: no visible global function definition for 'glm'
summary.est.data.frame: no visible global function definition for
  'qnorm'
summary.est.matched.data.frame: no visible global function definition
  for 'qnorm'
summary.est.matched.pscore: no visible global function definition for
  'qnorm'
summary.est.stratified.data.frame: no visible global function
  definition for 'qnorm'
summary.est.stratified.pscore: no visible global function definition
  for 'qnorm'
Undefined global functions or variables:
  abline axis barplot binomial box chisq.test close.screen cov density
  dev.new formula glm grey.colors heat.colors hist legend lines
  mahalanobis model.frame model.matrix mtext na.exclude na.omit par
  plot points predict qnorm rainbow_hcl screen sd split.screen t.test
  var vcov
Consider adding
  importFrom("grDevices", "dev.new", "grey.colors", "heat.colors")
  importFrom("graphics", "abline", "axis", "barplot", "box",
             "close.screen", "hist", "legend", "lines", "mtext", "par",
             "plot", "points", "screen", "split.screen")
  importFrom("stats", "binomial", "chisq.test", "cov", "density",
             "formula", "glm", "mahalanobis", "model.frame",
             "model.matrix", "na.exclude", "na.omit", "predict", "qnorm",
             "sd", "t.test", "var", "vcov")
to your NAMESPACE file.