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Table 2 The intra-day and inter-day precision and accuracy data for ETD obtained by the proposed methods (A – C).

From: Spectrophotometric determination of etodolac in pure form and pharmaceutical formulations

   Intra-day Inter-day
Method Added (μg mL-1) Found ± SE a, b (μg mL-1) Precision RSD % Accuracy R.M.E % Founda, b (μg mL-1) Precision RSD % Accuracy R.M.E %
A 1 0.99 ± 0.45 1.11 -1.00 1.01 ± 0.20 1.49 1.00
  3 3.02 ± 0.49 1.20 0.67 2.97 ± 0.37 0.91 -1.00
  5 4.99 ± 0.26 0.64 -0.20 4.94 ± 0.31 0.77 -1.20
  7 6.97 ± 0.24 0.59 -0.43 6.94 ± 0.34 0.85 -0.86
B 2 2.02 ± 0.55 1.34 1.00 2.01 ± 0.63 1.54 0.50
  4 3.97 ± 0.31 0.76 -0.75 3.99 ± 0.46 1.13 -0.25
  6 5.93 ± 0.29 0.71 -1.17 5.96 ± 0.43 1.06 -0.67
  8 8.05 ± 0.36 0.88 0.625 7.97 ± 0.38 0.93 -0.38
C 4 3.98 ± 0.18 0.45 -0.50 4.01 ± 0.46 1.12 -0.50
  8 7.95 ± 0.20 0.50 -0.625 8.03 ± 0.40 0.98 0.38
  12 11.94 ± 0.33 0.82 -0.50 12.04 ± 0.48 1.16 0.33
  16 16.02 ± 0.49 1.19 0.125 15.91 ± 0.54 1.32 -0.56
  1. a Average of six determinations.
  2. b Mean ± standard error.
  3. RSD%, percentage relative standard deviation;
  4. R.M.E %, percentage relative mean error.