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Table 3 The robust statistics and robust z-scoresa of glucose test results

From: The study of statistical methods for evaluating the comparability of routine chemistry analytes among 3 routine laboratory measurement systems in China

Lot Robust average Robust s Range of robust z-scores The percentage of |z-score| ≤2
1 6.009 0.179 −2.397 to 2.268 80 % (16/20)
2 7.117 0.209 −2.354 to 3.124 90 % (18/20)
3 5.126 0.186 −2.102 to 1.957 95 % (19/20)
4 5.746 0.193 −2.881 to 1.731 95 % (19/20)
5 6.683 0.264 −2.379 to 1.390 95 % (19/20)
6 7.630 0.254 −2.795 to 2.008 90 % (18/20)
7 8.795 0.209 −2.895 to 2.656 90 % (18/20)
8 9.949 0.270 −2.793 to 2.133 90 % (18/20)
9 14.434 0.377 −2.517 to 2.125 90 % (18/20)
10 12.026 0.433 −2.023 to 5.356 90 % (18/20)
  1. aThe z-score in this table have been derived from the data in column “Robust average” and “Robust s”. The formula for the z-score in this table is z = (x − \({\text{x}}^{*}\))/\({\text{s}}^{*}\)