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Table 3 Predicted versus True 0.50 Quantiles using the 0.15 Quantile as a Predictor Variable based on a linear model with an interaction term.

From: Early prediction of median survival among a large AIDS surveillance cohort

  Data as of December 31, 1996 Data as of December 31, 2001
    Observed Quantiles      
Cohort n largest follow-up time (months) 0.15 (A) 0.50 (B) Predicted 0.50 Quantile† (C) largest follow-up time (months) "True" 0.15 Quantile§ (D) True 0.50 Quantile‡ (E) Difference (C – E)
831 140 167 2 12 9 227 2 12 -3
832 154 164 2 11 10 224 1 11 -1
833 204 161 1 10 9 221 1 10 -1
834 205 158 1 10 9 218 1 11 -2
841 277 155 2 10 11 215 1 10 1
842 315 152 1 9 10 212 1 11 -1
843 397 149 2 12 12 209 1 11 1
844 418 146 2 10 12 206 1 9 3
851 531 143 1 10 11 203 1 10 1
852 624 140 1 10 11 200 1 10 1
853 718 137 1 11 12 197 1 10 2
854 689 134 1 11 12 194 1 10 2
861 876 131 1 10 13 191 1 10 3
862 955 128 1 10 13 188 1 10 3
863 1113 125 1 11 13 185 1 11 2
864 1110 122 1 14 14 182 1 15 -1
871 1316 119 1 15 14 179 1 14 0
872 1474 116 1 16 14 176 1 15 -1
873 1484 113 1 17 15 173 2 17 -2
874 1425 110 2 17 16 170 2 17 -1
881 1649 107 2 18 17 167 2 18 -1
882 1658 104 2 19 17 164 3 19 -2
883 1759 101 2 18 17 161 2 18 -1
884 1693 98 1 18 16 158 1 18 -2
891 1930 95 2 19 18 155 2 18 0
892 2187 92 2 20 18 152 2 19 -1
893 2047 89 3 20 20 149 3 21 -1
894 1997 86 2 19 19 146 2 18 1
901 2265 83 2 21 19 143 3 22 -3
902 2243 80 3 21 21 140 4 22 -1
903 2285 77 3 19 21 137 3 20 1
904 2139 74 3 20 22 134 3 20 2
911 2611 71 5 21 24 131 5 22 2
912 2543 68 4 23 23 128 4 23 0
913 2845 65 4 23 24 125 4 23 1
914 2930 62 5 24 25 122 5 24 1
921 3227 59 7 27 28 119 8 27 1
922 2920 56 7 28 28 116 7 28 0
923 2971 53 7 28 28 113 7 27 1
924 3061 50 7 30 29 110 7 29 0
931 3264 47 9 32 31 107 9 31 0
932 2903 44 8 32 31 104 8 32 -1
933 2788 41 9 * 32 101 9 32 0
934 2624 38 9 * 32 98 9 40 -8
941 2766 35 8 * 32 95 9 46 -14
942 2518 32 7 * 31 92 8 80 -49
943 2335 29 9 * 33 89 9 *  
944 2203 26 9 * 34 86 8 *  
951 2451 23 10 * 35 83 9 *  
952 2245 20 11 * 36 80 10 *  
953 1949 17 8 * 34 77 9 *  
954 1860 14 10 * 36 74 9 *  
961 1894 11 * * * 71 12 *  
962 1488 8 5 * 31 68 16 *  
963 1225 5 * * * 65 16 *  
964 475 2 * * * 62 9 *  
  1. * denotes that the observed quantile could not be estimated from the data.
  2. † The predicted 0.50 quantile is based on HARS data as of December 31, 1996.
  3. §The true 0.15 quantile is based on HARS data as of December 31, 2001.
  4. ‡ The true 0.50 quantile is based on HARS data as of December 31, 2001.