Errors in running code in vignettes:
when running code in 'ordinal-retinopathy1.Rnw'
  ...

> data(retinopathy)

> retinopathy$SM <- as.factor(retinopathy$SM)

> library(VGAM)

  When sourcing 'ordinal-retinopathy1.R':
Error: there is no package called 'VGAM'
Execution halted
when running code in 'ordinal-retinopathy2.Rnw'
  ...
> library(catdata)
Loading required package: MASS

> data(retinopathy)

> library(VGAM)

  When sourcing 'ordinal-retinopathy2.R':
Error: there is no package called 'VGAM'
Execution halted

  'altbin-teratology.Rnw' using 'UTF-8'... OK
  'binary-unemployment.Rnw' using 'UTF-8'... OK
  'binary-vaso.Rnw' using 'UTF-8'... OK
  'count-children.Rnw' using 'UTF-8'... OK
  'count-encephalitis.Rnw' using 'UTF-8'... OK
  'count-insolvency.Rnw' using 'UTF-8'... OK
  'count-medcare.Rnw' using 'UTF-8'... OK
  'loglinear-birth.Rnw' using 'UTF-8'... OK
  'loglinear-leukoplakia.Rnw' using 'UTF-8'... OK
  'modbin-dust.Rnw' using 'UTF-8'... OK
  'modbin-foodstamp.Rnw' using 'UTF-8'... OK
  'modbin-unemployment1.Rnw' using 'UTF-8'... OK
  'modbin-unemployment2.Rnw' using 'UTF-8'... OK
  'multinomial-addiction1.Rnw' using 'UTF-8'... OK
  'multinomial-addiction2.Rnw' using 'UTF-8'... OK
  'multinomial-party1.Rnw' using 'UTF-8'... OK
  'multinomial-party2.Rnw' using 'UTF-8'... OK
  'multinomial-travel.Rnw' using 'UTF-8'... OK
  'multivariate-birth1.Rnw' using 'UTF-8'... OK
  'multivariate-birth2.Rnw' using 'UTF-8'... OK
  'multivariate-knee.Rnw' using 'UTF-8'... OK
  'ordinal-arthritis.Rnw' using 'UTF-8'... OK
  'ordinal-knee1.Rnw' using 'UTF-8'... OK
  'ordinal-knee2.Rnw' using 'UTF-8'... OK
  'ordinal-retinopathy1.Rnw' using 'UTF-8'... failed
  'ordinal-retinopathy2.Rnw' using 'UTF-8'... failed
  'prediction-medcare.Rnw' using 'UTF-8'... OK
  'random-aids.Rnw' using 'UTF-8'... OK
  'random-betablocker.Rnw' using 'UTF-8'... OK
  'random-knee1.Rnw' using 'UTF-8'... OK
  'random-knee2.Rnw' using 'UTF-8'... OK
  'random-knee3.Rnw' using 'UTF-8'... OK
  'semiparametric-addiction.Rnw' using 'UTF-8'... OK
  'semiparametric-children.Rnw' using 'UTF-8'... OK
  'semiparametric-dust.Rnw' using 'UTF-8'... OK
  'semiparametric-unemployment.Rnw' using 'UTF-8'... OK
  'tree-dust.Rnw' using 'UTF-8'... OK
  'tree-unemployment.Rnw' using 'UTF-8'... OK