Final Report Report No.: 1 Program No.: WAT-CH-0001 Program ...
Final Report Report No.: 1 Program No.: WAT-CH-0001 Program ...
Final Report Report No.: 1 Program No.: WAT-CH-0001 Program ...
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Frequency<br />
<strong>Report</strong> <strong>No</strong>.: 1<br />
Data Statistics<br />
Number of results 26<br />
Number of excluded 0<br />
results*<br />
Assigned value 880.22<br />
Uncertainty of assigned 26.91<br />
value<br />
SDPA** 109.78<br />
* The influence of outliers on summary statistics has been minimized by the use of robust<br />
statistical methods but obvious blunders, such as those with incorrect units, decimal point<br />
errors, and results for a different proficiency test item are removed from the data set and treated<br />
separately. These results are not the subject to outlier tests or robust statistical methods.<br />
** Method 1 in clause 6-3 (robust standard deviation) has been used for determination of SDPA.<br />
14<br />
Histogram of participants Z-scores for TDS<br />
12<br />
10<br />
8<br />
6<br />
4<br />
2<br />
0<br />
-3 -2 -1 0 1 2 3 More<br />
Z-scores<br />
Page 44 of 57
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