Ggfastfast: no visible global function definition for 'as'
distance: no visible global function definition for 'quantile'
distance: no visible global function definition for 'write.table'
fierror: no visible global function definition for 'as'
fistslserror: no visible global function definition for 'as'
fistslsfast: no visible global function definition for 'as'
gstslshet: no visible binding for global variable 'na.fail'
gstslshet: no visible global function definition for 'terms'
gstslshet: no visible global function definition for 'lm'
gstslshet: no visible global function definition for 'model.extract'
gstslshet: no visible global function definition for 'residuals'
gstslshet: no visible global function definition for 'coefficients'
gstslshet: no visible global function definition for 'nlminb'
gstslshet: no visible global function definition for 'pchisq'
gstslshet: no visible global function definition for 'fitted'
listw2dgCMatrix: no visible global function definition for 'new'
print.sphet: no visible global function definition for 'coef'
print.summary.sphet: no visible global function definition for
  'printCoefmat'
read.gwt2dist: no visible global function definition for 'read.table'
spreg: no visible binding for global variable 'na.fail'
spreg: no visible global function definition for 'terms'
spreg: no visible global function definition for 'lm'
spreg: no visible global function definition for 'model.extract'
spreg: no visible global function definition for 'residuals'
spreg: no visible global function definition for 'coefficients'
spreg: no visible global function definition for 'nlminb'
spreg: no visible global function definition for 'pchisq'
stslshac: no visible binding for global variable 'na.fail'
stslshac: no visible global function definition for 'terms'
stslshac: no visible global function definition for 'lm'
stslshac: no visible global function definition for 'model.extract'
summary.sphet: no visible global function definition for 'pnorm'
sumres: no visible global function definition for 'residuals'
Undefined global functions or variables:
  as coef coefficients fitted lm model.extract na.fail new nlminb
  pchisq pnorm printCoefmat quantile read.table residuals terms
  write.table
Consider adding
  importFrom("methods", "as", "new")
  importFrom("stats", "coef", "coefficients", "fitted", "lm",
             "model.extract", "na.fail", "nlminb", "pchisq", "pnorm",
             "printCoefmat", "quantile", "residuals", "terms")
  importFrom("utils", "read.table", "write.table")
to your NAMESPACE file (and ensure that your DESCRIPTION Imports field
contains 'methods').