Beta: no visible global function definition for 'qf'
Beta: no visible global function definition for 'pf'
Confint.mean.two_stage: no visible global function definition for 'sd'
Confint.mean.two_stage: no visible global function definition for 'qt'
add_size.mean.two_stage: no visible global function definition for 'sd'
add_size.mean.two_stage: no visible global function definition for 'qt'
bibd.method1: no visible global function definition for 'combn'
delta.t.test: no visible global function definition for 'power.t.test'
design.regression.polynom: no visible global function definition for
  'deriv'
hadamard.table: no visible global function definition for 'data'
ncp: no visible global function definition for 'pf'
ncp: no visible global function definition for 'qf'
plot.triangular.test: no visible global function definition for 'plot'
plot.triangular.test: no visible global function definition for
  'polygon'
plot.triangular.test: no visible global function definition for 'text'
plot.triangular.test: no visible global function definition for 'lines'
plot.triangular.test: no visible global function definition for
  'points'
seqadd.confint: no visible global function definition for 'sd'
seqadd.confint: no visible global function definition for 'qt'
seqadd.confint: no visible global function definition for 'uniroot'
seqadd.normal: no visible global function definition for 'sd'
seqadd.normal: no visible global function definition for 'qt'
sequential.test.select_mean: no visible global function definition for
  'var'
size.comparing.variances : g: no visible global function definition for
  'qf'
size.comparing.variances: no visible global function definition for
  'uniroot'
size.comparing_probs.mcnemar: no visible global function definition for
  'qnorm'
size.multiple_t.test: no visible global function definition for
  'power.t.test'
size.prop.confint: no visible global function definition for 'qnorm'
size.prop.test: no visible global function definition for 'qnorm'
size.prop_test.two_sample: no visible global function definition for
  'power.prop.test'
size.prop_test.two_sample: no visible global function definition for
  'pnorm'
size.prop_test.two_sample: no visible global function definition for
  'qnorm'
size.selection.bechhofer: no visible global function definition for
  'uniroot'
size.seq_select.mean: no visible global function definition for 'var'
size.t.test: no visible global function definition for 'power.t.test'
size.variance.confint : c1: no visible global function definition for
  'qchisq'
size.variance.confint : c2: no visible global function definition for
  'qchisq'
size.variance.confint: no visible global function definition for
  'uniroot'
size_n.regII.ci_b1: no visible global function definition for 'qt'
size_n.regII.ci_exp: no visible global function definition for 'qt'
size_n.regII.ci_rho: no visible global function definition for 'qnorm'
size_n.regII.test_rho: no visible global function definition for
  'qnorm'
size_n.regII.test_rho2: no visible global function definition for
  'qnorm'
size_n.regII.test_rho_2: no visible global function definition for
  'qnorm'
sizes.confint.welch : g: no visible global function definition for 'qt'
sizes.confint.welch: no visible global function definition for
  'uniroot'
triangular.test.norm: no visible global function definition for 'var'
triangular.test.norm: no visible global function definition for 'qnorm'
triangular.test.norm: no visible global function definition for
  'update'
triangular.test.prop: no visible global function definition for 'qnorm'
triangular.test.prop: no visible global function definition for
  'update'
update.triangular.test: no visible global function definition for
  'update'
update.triangular.test.norm: no visible global function definition for
  'var'
update.triangular.test.norm: no visible global function definition for
  'qnorm'
Undefined global functions or variables:
  combn data deriv lines pf plot pnorm points polygon power.prop.test
  power.t.test qchisq qf qnorm qt sd text uniroot update var
Consider adding
  importFrom("graphics", "lines", "plot", "points", "polygon", "text")
  importFrom("stats", "deriv", "pf", "pnorm", "power.prop.test",
             "power.t.test", "qchisq", "qf", "qnorm", "qt", "sd",
             "uniroot", "update", "var")
  importFrom("utils", "combn", "data")
to your NAMESPACE file.