MBA-3
Start Date: 8/6/01
MPN Staph A B
AACC Proficiency Testing/Rating Service
Direct Staph A B Yeasts A B A Molds B A APC B Coliforms A B
8/31/01
E. Coli A B
Sub # 34 191 219 323 359 392 540 792 793 817 818 826 1010 1012 1013 1014 1016 1017 1037 1302 1314 1380 1387 1407 1420 1431 1454 1490 1509 1524 1595 1596 1610 1616
1.11
* 2.74
0.92 0.78 2.54 0.88 0.75 1.20 1.31 0.12 0.55 0.02 0.30 1.14 1.40 0.18 0.55 0.30 0.22 1.28 0.58 1.40 0.55 1.40 1.04 0.92 1.20 0.73
0.02 0.61 0.83 0.68 0.87 0.83 0.42 0.83 0.83 0.83 0.83 0.53 0.83 0.83 0.83 0.83 0.83 0.83 2.23 0.83 0.28 1.02 0.36 0.83 0.28 0.83 0.02 0.02 1.99 0.42 2.69
0.08 0.56 0.56 1.71 0.91 0.56 0.56 0.56 0.56 0.56 0.56 0.56 0.56 0.56 0.56 0.56 0.56 2.53 0.56 0.56 0.56 1.78 0.56 1.11 0.56 0.56 1.09 0.39 2.69 0.56 0.56
0.28 0.56 0.36 0.56 1.61 0.56 0.27 0.72 0.17 0.56 0.16 1.37 0.62 1.21 1.53 1.10 0.56 1.42 0.89 0.16 0.41 1.08 0.07 1.27 0.28 0.45 1.29 1.29 0.89 0.78 2.62
0.08 0.90 0.29 0.21 0.30 0.66 0.90 0.21 1.11 1.20 1.19 0.88 0.45 0.90 2.50 0.71 0.90 0.78 0.37 0.21 1.12 1.36 0.08 0.71 0.59 1.20 1.51
* 9.81
0.31 0.14 0.45 0.61 0.53 2.56 0.11 0.53 0.38 0.81 1.48 0.80 0.40 1.10 0.00 0.24 2.86 0.07 0.47 0.85 1.68 1.56 0.25 0.49 0.85 0.74 0.07 0.30 1.07 0.14 0.25 0.91
0.93 0.65 0.70 1.33 0.23 0.70 0.19 0.42 0.66 0.24 0.70 0.89 1.77 0.37 0.89 0.08 1.26 0.04 1.85 0.14 1.39 1.17 1.51 1.10 1.20 1.04 0.03 0.37 2.34 0.39 0.84 0.04
0.58 0.89 0.73 1.16 0.34 0.75 1.36 1.59 0.78 1.59 0.11 0.99 1.22 1.05 0.53 0.06 0.20 1.59 1.59 0.27 0.50 1.59 0.27 0.78 0.71 0.11 1.59 0.52 1.59 0.50 0.75 0.78
0.10 0.06 1.42 1.62 1.07 0.94 0.52 0.88 0.88 1.27 0.44 0.30 1.27 0.44 0.44 0.88 0.79 0.44 0.94 0.88 0.94 0.88 0.94 0.88 1.49 0.89 0.06 0.14 2.56 0.12 1.51 0.30
0.06 0.28 1.28 1.47 0.28 0.10 0.69 0.73 0.73 0.79 0.10 1.05 1.07 0.61 0.61 2.03 0.96 0.61 1.49 0.73 0.75 1.24 1.68 * 3.77 1.39 1.07 0.10 0.08 1.05 0.39 1.60 0.90
0.28 0.44 0.83 0.39
2.02 0.59 0.59
MBA-3
Start Date: 8/6/01
MPN Staph A B
AACC Proficiency Testing/Rating Service
Direct Staph A B Yeasts A B A Molds B A APC B Coliforms A B
8/31/01
E. Coli A B
Sub # N Mean Min Max
3 0.74 0.28 1.11
28 0.82 0.02 2.54
31 0.80 0.02 2.69
31 0.79 0.08 2.69
31 0.81 0.07 2.62
30 0.82 0.08 2.50
32 0.72 0.00 2.86
32 0.80 0.03 2.34
32 0.85 0.06 1.59
32 0.82 0.06 2.56
31 0.84 0.06 2.03
* Not included in analytical mean Z-Values Each individual z-value represents the decimal number of standard deviations by which an analytical result differs from the "true value", as represented by the mean. The minimum or "perfect" z-value is thus 0.00.
Proficiency in any one analysis over a year's time (11 or 12 monthly, 6 bimonthly, or 4 quarterly results) is determined by their mean z-value plus a penalty for each outlier (*) reported, if any. Proficiency in a series is determined by the mean of the mean z-values (including penalties, if any) for the specified principal analyses in that series. In general, z-values of less than 2.00, consistently maintained and thus averaging less than 2000 over a year for a series (including outlier penalties, if any), are considered to represent satisfactory accuracy and precision. On the same basis, values of less than 1.00 consistently maintained represent outstanding accuracy and precision. A detailed description of this rating system is available upon request from AACC headquarters.
CONFIDENTIALITY NOTICE: The data contained herein are confidential and intended for subscriber use only. Data from other subscribers are included for comparison purposes only.