## PIAAC ref

wt5REF <- c(
  "Wald test:",
  "----------",
  "H0:",
  "i_q04jVERY LITTLE = 1",
  "i_q04jTO SOME EXTENT = 1",
  "i_q04jTO A HIGH EXTENT = 1",
  "i_q04jTO A VERY HIGH EXTENT = 1",
  "",
  "Chi-square test:",
  "X2 = 45.6, df = 4, P(> X2) = 3e-09",
  "",
  "F test:",
  "W = 10.6, df1 = 4, df2 = 42, P(> W) = 4.8e-06"
)

wt6REF <- c(
  "Wald test:",
  "----------",
  "H0:",
  "i_q04jVERY LITTLE = 1",
  "i_q04jTO SOME EXTENT = 1",
  "i_q04jTO A HIGH EXTENT = 1",
  "i_q04jTO A VERY HIGH EXTENT = 1",
  "",
  "Chi-square test:",
  "X2 = 45.7, df = 4, P(> X2) = 2.9e-09",
  "",
  "F test:",
  "W = 11.0, df1 = 4, df2 = 77, P(> W) = 4.2e-07"
)

wt7REF <- c(
  "Wald test:",
  "----------",
  "H0:",
  "i_q04jVERY LITTLE = 1",
  "i_q04jTO SOME EXTENT = 1",
  "i_q04jTO A HIGH EXTENT = 1",
  "i_q04jTO A VERY HIGH EXTENT = 1",
  "",
  "Chi-square test:",
  "X2 = 51.1, df = 4, P(> X2) = 2.1e-10",
  "",
  "F test:",
  "W = 12.8, df1 = 4, df2 = 4600, P(> W) = 2.4e-10"
)