AICf: no visible global function definition for ‘na.omit’
carcass.EMI.multi: no visible global function definition for ‘approx’
epirice.model : fRcA: no visible global function definition for
  ‘approx’
epirice.model : fRcT: no visible global function definition for
  ‘approx’
epirice.weather: no visible binding for global variable
  ‘weather_SouthAsia’
evaluation.criteria: no visible global function definition for ‘var’
evaluation.criteria: no visible global function definition for ‘cov’
evaluation.criteria: no visible global function definition for ‘par’
evaluation.criteria: no visible global function definition for ‘plot’
evaluation.criteria: no visible global function definition for ‘abline’
evaluation.criteria: no visible global function definition for
  ‘barplot’
goodness.of.fit: no visible global function definition for ‘sd’
goodness.of.fit: no visible global function definition for ‘cor’
goodness.of.fit: no visible global function definition for ‘cov’
goodness.of.fit: no visible global function definition for ‘var’
goodness.of.fit: no visible global function definition for ‘par’
goodness.of.fit: no visible global function definition for ‘plot’
goodness.of.fit: no visible global function definition for ‘abline’
goodness.of.fit: no visible global function definition for ‘barplot’
maize.multisy: no visible binding for global variable
  ‘weather_EuropeEU’
maize.multisy240 : <anonymous>: no visible binding for global variable
  ‘weather_EuropeEU’
maize.weather: no visible binding for global variable
  ‘weather_FranceWest’
param.rtriangle: no visible global function definition for ‘rtriangle’
param.runif: no visible global function definition for ‘runif’
population.age.model.ode: no visible global function definition for
  ‘ode’
population.age.model.ode: no visible global function definition for
  ‘rkMethod’
predator.prey.model: no visible global function definition for ‘ode’
predator.prey.model: no visible global function definition for
  ‘rkMethod’
watbal.weather: no visible binding for global variable
  ‘weather_FranceWest’
Undefined global functions or variables:
  abline approx barplot cor cov na.omit ode par plot rkMethod rtriangle
  runif sd var weather_EuropeEU weather_FranceWest weather_SouthAsia
Consider adding
  importFrom("graphics", "abline", "barplot", "par", "plot")
  importFrom("stats", "approx", "cor", "cov", "na.omit", "runif", "sd",
             "var")
to your NAMESPACE file.