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Table 5 Assessing model predictions

From: Mapping of the Insomnia Severity Index and other sleep measures to EuroQol EQ-5D health state utilities

   N Model I Model II Model III Model IV
    MSE MAE MSE MAE MSE MAE MSE MAE
Estimation Sample Full index 1421 (100%) 0.024 0.109 0.025 0.110 0.026 0.112 0.024 0.110
  < 0.2 10 (0.68%) N/A 0.545 0.375 0.566 0.424 0.567 N/A 0.526
  0.2-0.4 53 (3.76%) 0.184 0.350 0.146 0.366 0.155 0.377 0.192 0.392
  0.4-0.6 164 (11.57%) 0.070 0.232 0.066 0.235 0.068 0.241 0.072 0.250
  0.6-0.8 329 (23.15%) 0.008 0.066 0.007 0.063 0.007 0.064 0.005 0.057
  0.8-1.0 865 (60.85%) 0.013 0.083 0.013 0.084 0.014 0.085 0.013 0.087
Validation Sample Full index 1421 (100%) 0.025 0.110 0.024 0.110 0.025 0.111 0.023 0.108
  < 0.2 10 (0.73%) N/A 0.538 0.351 0.555 0.389 0.547 N/A 0.502
  0.2-0.4 53 (3.70%) 0.209 0.373 0.157 0.381 0.165 0.388 0.207 0.407
  0.4-0.6 163 (11.44%) 0.071 0.233 0.064 0.234 0.067 0.235 0.071 0.246
  0.6-0.8 326 (22.95%) 0.008 0.069 0.007 0.061 0.007 0.064 0.006 0.061
  0.8-1.0 869 (61.18%) 0.013 0.083 0.013 0.084 0.014 0.085 0.013 0.087
  1. -MSE = Mean square error.
  2. -N/A = Estimates were not available due to the small sample size
  3. -MAE = Mean absolute error
  4. - Note: For model specifications please refer to Table 1
  5. -Sample size for both the estimation and validation sample was randomly drawn (50%) from the total qualified participants (N = 2,842).