Malformed Description field: should contain one or more complete sentences.
calfun: no visible global function definition for 'optim'
calfun: no visible global function definition for 'cov'
calfun: no visible global function definition for 'var'
Undefined global functions or variables:
  cov optim var
Consider adding
  importFrom("stats", "cov", "optim", "var")
to your NAMESPACE file.
Malformed Description field: should contain one or more complete sentences.
calfun: no visible global function definition for ‘optim’
calfun: no visible global function definition for ‘cov’
calfun: no visible global function definition for ‘var’
Undefined global functions or variables:
  cov optim var
Consider adding
  importFrom("stats", "cov", "optim", "var")
to your NAMESPACE file.
Malformed Description field: should contain one or more complete sentences.
calfun: no visible global function definition for ‘optim’
calfun: no visible global function definition for ‘cov’
calfun: no visible global function definition for ‘var’
Undefined global functions or variables:
  cov optim var
Consider adding
  importFrom("stats", "cov", "optim", "var")
to your NAMESPACE file.
Malformed Description field: should contain one or more complete sentences.
calfun: no visible global function definition for ‘optim’
calfun: no visible global function definition for ‘cov’
calfun: no visible global function definition for ‘var’
Undefined global functions or variables:
  cov optim var
Consider adding
  importFrom("stats", "cov", "optim", "var")
to your NAMESPACE file.
Malformed Description field: should contain one or more complete sentences.
calfun: no visible global function definition for 'optim'
calfun: no visible global function definition for 'cov'
calfun: no visible global function definition for 'var'
Undefined global functions or variables:
  cov optim var
Consider adding
  importFrom("stats", "cov", "optim", "var")
to your NAMESPACE file.
Malformed Description field: should contain one or more complete sentences.
calfun: no visible global function definition for ‘optim’
calfun: no visible global function definition for ‘cov’
calfun: no visible global function definition for ‘var’
Undefined global functions or variables:
  cov optim var
Consider adding
  importFrom("stats", "cov", "optim", "var")
to your NAMESPACE file.
Malformed Description field: should contain one or more complete sentences.
calfun: no visible global function definition for ‘optim’
calfun: no visible global function definition for ‘cov’
calfun: no visible global function definition for ‘var’
Undefined global functions or variables:
  cov optim var
Consider adding
  importFrom("stats", "cov", "optim", "var")
to your NAMESPACE file.
Malformed Description field: should contain one or more complete sentences.
calfun: no visible global function definition for ‘optim’
calfun: no visible global function definition for ‘cov’
calfun: no visible global function definition for ‘var’
Undefined global functions or variables:
  cov optim var
Consider adding
  importFrom("stats", "cov", "optim", "var")
to your NAMESPACE file.
Malformed Description field: should contain one or more complete sentences.
calfun: no visible global function definition for ‘optim’
calfun: no visible global function definition for ‘cov’
calfun: no visible global function definition for ‘var’
Undefined global functions or variables:
  cov optim var
Consider adding
  importFrom("stats", "cov", "optim", "var")
to your NAMESPACE file.
Malformed Description field: should contain one or more complete sentences.
calfun: no visible global function definition for 'optim'
calfun: no visible global function definition for 'cov'
calfun: no visible global function definition for 'var'
Undefined global functions or variables:
  cov optim var
Consider adding
  importFrom("stats", "cov", "optim", "var")
to your NAMESPACE file.
Malformed Description field: should contain one or more complete sentences.
calfun: no visible global function definition for ‘optim’
calfun: no visible global function definition for ‘cov’
calfun: no visible global function definition for ‘var’
Undefined global functions or variables:
  cov optim var
Consider adding
  importFrom("stats", "cov", "optim", "var")
to your NAMESPACE file.
Malformed Description field: should contain one or more complete sentences.
calfun: no visible global function definition for ‘optim’
calfun: no visible global function definition for ‘cov’
calfun: no visible global function definition for ‘var’
Undefined global functions or variables:
  cov optim var
Consider adding
  importFrom("stats", "cov", "optim", "var")
to your NAMESPACE file.
Malformed Description field: should contain one or more complete sentences.
calfun: no visible global function definition for 'optim'
calfun: no visible global function definition for 'cov'
calfun: no visible global function definition for 'var'
Undefined global functions or variables:
  cov optim var
Consider adding
  importFrom("stats", "cov", "optim", "var")
to your NAMESPACE file.