Cor: no visible global function definition for ‘sd’
Cor: no visible global function definition for ‘cor’
MSE: no visible global function definition for ‘median’
SD: no visible global function definition for ‘sd’
cv.spikeslab : eval.fold: no visible global function definition for
  ‘predict’
cv.spikeslab: no visible global function definition for ‘mclapply’
cv.spikeslab: no visible global function definition for ‘matplot’
cv.spikeslab: no visible global function definition for ‘lines’
cv.spikeslab: no visible global function definition for ‘sd’
cv.spikeslab: no visible global function definition for ‘head’
error.bars: no visible global function definition for ‘segments’
gnet.get: no visible global function definition for ‘lars’
gnet.get: no visible global function definition for ‘predict.lars’
plot.spikeslab: no visible global function definition for ‘plot.lars’
plot.spikeslab: no visible global function definition for ‘matplot’
plot.spikeslab: no visible global function definition for ‘lines’
predict.spikeslab: no visible global function definition for
  ‘delete.response’
predict.spikeslab: no visible global function definition for
  ‘model.matrix’
print.spikeslab: no visible global function definition for ‘head’
sd.center: no visible global function definition for ‘sd’
sparsePC.spikeslab : permute.rows: no visible global function
  definition for ‘runif’
sparsePC.spikeslab : get.pc : <anonymous>: no visible global function
  definition for ‘randomForest’
sparsePC.spikeslab : get.pc : <anonymous>: no visible binding for
  global variable ‘sd’
sparsePC.spikeslab : get.pc : <anonymous>: no visible global function
  definition for ‘rnorm’
sparsePC.spikeslab: no visible global function definition for
  ‘randomForest’
sparsePC.spikeslab: no visible global function definition for ‘predict’
sparsePC.spikeslab: no visible global function definition for ‘sd’
spikeslab: no visible global function definition for ‘rnorm’
spikeslab: no visible global function definition for ‘model.response’
spikeslab: no visible global function definition for ‘model.matrix’
spikeslab: no visible global function definition for ‘randomForest’
spikeslab: no visible global function definition for ‘predict’
spikeslab.GibbsCore : beta.update: no visible global function
  definition for ‘rnorm’
spikeslab.GibbsCore : svd.trick: no visible global function definition
  for ‘rnorm’
spikeslab.GibbsCore: no visible global function definition for ‘rnorm’
spikeslab.GibbsCore: no visible global function definition for ‘rgamma’
spikeslab.GibbsCore: no visible global function definition for ‘sd’
spikeslab.GibbsCore: no visible global function definition for ‘rbeta’
Undefined global functions or variables:
  cor delete.response head lars lines matplot mclapply median
  model.matrix model.response plot.lars predict predict.lars
  randomForest rbeta rgamma rnorm runif sd segments
Consider adding
  importFrom("graphics", "lines", "matplot", "segments")
  importFrom("stats", "cor", "delete.response", "median", "model.matrix",
             "model.response", "predict", "rbeta", "rgamma", "rnorm",
             "runif", "sd")
  importFrom("utils", "head")
to your NAMESPACE file.