HDmehtatalo: no visible global function definition for ‘points’
ImputeHeights: no visible global function definition for ‘predict’
ImputeHeights: no visible global function definition for ‘rnorm’
NRnum : <anonymous>: no visible global function definition for
  ‘numericDeriv’
circle: no visible global function definition for ‘lines’
fithd: no visible binding for global variable ‘sd’
fithd: no visible global function definition for ‘as.formula’
fithd: no visible global function definition for ‘terms’
fithd: no visible binding for global variable ‘as.formula’
linesplot: no visible global function definition for ‘lines’
linesplot: no visible global function definition for ‘points’
linesplot: no visible global function definition for ‘lowess’
mywhiskers : <anonymous>: no visible global function definition for
  ‘sd’
mywhiskers: no visible global function definition for ‘points’
mywhiskers : <anonymous>: no visible global function definition for
  ‘lines’
plot.hdmod: no visible global function definition for ‘resid’
plot.hdmod: no visible global function definition for ‘sd’
plot.hdmod: no visible global function definition for ‘abline’
plot.hdmod: no visible global function definition for ‘devAskNewPage’
plot.hdmod: no visible global function definition for ‘lm’
qqplotHD: no visible global function definition for ‘resid’
qqplotHD: no visible global function definition for ‘par’
qqplotHD: no visible global function definition for ‘qqnorm’
qqplotHD: no visible global function definition for ‘qqline’
qqplotHD : <anonymous>: no visible global function definition for
  ‘qqnorm’
qqplotHD : <anonymous>: no visible global function definition for
  ‘qqline’
scaleDGMed: no visible global function definition for ‘qgamma’
startHDcurtis: no visible global function definition for ‘lm’
startHDgomperz: no visible global function definition for ‘lm’
startHDhossfeldIV: no visible global function definition for ‘lm’
startHDkorf: no visible global function definition for ‘lm’
startHDkorf: no visible binding for global variable ‘na.omit’
startHDlogistic: no visible global function definition for ‘lm’
startHDmehtatalo: no visible global function definition for ‘lm’
startHDmeyer: no visible global function definition for ‘lm’
startHDmichailoff: no visible global function definition for ‘lm’
startHDmicment: no visible global function definition for ‘lm’
startHDmicment2: no visible global function definition for ‘lm’
startHDnaslund: no visible global function definition for ‘lm’
startHDnaslund2: no visible global function definition for ‘lm’
startHDnaslund3: no visible global function definition for ‘lm’
startHDnaslund4: no visible global function definition for ‘lm’
startHDpower: no visible global function definition for ‘lm’
startHDprodan: no visible global function definition for ‘lm’
startHDratkowsky: no visible global function definition for ‘lm’
startHDrichards: no visible global function definition for ‘lm’
startHDsibbesen: no visible global function definition for ‘lm’
startHDweibull: no visible global function definition for ‘lm’
startHDwykoff: no visible global function definition for ‘lm’
Undefined global functions or variables:
  abline as.formula devAskNewPage lines lm lowess na.omit numericDeriv
  par points predict qgamma qqline qqnorm resid rnorm sd terms
Consider adding
  importFrom("grDevices", "devAskNewPage")
  importFrom("graphics", "abline", "lines", "par", "points")
  importFrom("stats", "as.formula", "lm", "lowess", "na.omit",
             "numericDeriv", "predict", "qgamma", "qqline", "qqnorm",
             "resid", "rnorm", "sd", "terms")
to your NAMESPACE file.