Table 13: Reproducibility data for NIST 1849a CRM practice sample
Sample ID: Practice Sample NIST 1849a
Analyte
CMP
UMP
GMP
IMP
AMP
(mg hg
-1
)
(mg hg
-1
)
(mg hg
-1
)
(mg hg
-1
)
(mg hg
-1
)
Laboratory
Rep-1
Rep-2
Rep-1
Rep-2
Rep-1
Rep-2
Rep-1
Rep-2
Rep-1
Rep-2
1
27.88
27.97
11.75
11.58
14.31
14.40
0.00
0.00
10.69
10.75
2
29.60
29.10
11.30
11.10
15.80
15.50
0.00
0.00
11.80
11.60
3
27.46
26.90
10.59
10.51
15.15
14.86
0.00
0.00
11.15
10.89
4
29.66
30.45
12.14
12.00
14.77
15.36
0.00
0.00
11.05
11.23
5
28.77
28.65
10.91
11.29
14.92
14.93
0.57
a
0.32
a
10.84
11.22
6
27.80
28.00
11.60
11.80
14.60
14.70
0.00
0.00
10.70
10.70
7
27.55
29.25
12.26
12.36
13.97
b
15.63
b
0.00
0.00
9.59
10.42
8
27.65
27.88
12.04
12.57
14.68
14.84
0.00
0.00
10.82
10.90
9
28.21
28.17
12.25
11.79
15.12
15.08
0.00
0.00
10.34
10.28
10
29.50
29.60
11.80
11.90
15.30
15.30
0.00
0.00
11.30
11.30
11
24.54
25.27
12.05
12.45
16.73
c
16.69
c
0.00
0.00
11.25
10.79
12
28.08
27.53
11.50
12.59
14.60
14.41
0.00
0.00
10.69
10.59
a
Identified as Grubbs outlier; results removed from data set for statistical analysis.
b
Identified as Cochran outlier; results kept in data set for statistical analysis.
c
Identified as Grubbs outlier; results kept in data set for statistical analysis.
Table 14: Reproducibility analysis for NIST 1849a CRM practice sample
Sample ID: Practice Sample NIST 1849a
Analyte
CMP
UMP
GMP
IMP
AMP
Seq.
Item
Symbol
Value
Value
Value
Value
Value
1
Total number of laboratories
n
12
12
12
11
a
12
2
Total number of replicates
2n
24
24
24
22
24
3
Overall mean of all data (grand mean)
28.14
11.76
15.07
n/a
10.87
4
Repeatability standard deviation
S
r
0.46
0.30
0.38
n/a
0.22
5
Reproducibility standard deviation
S
R
1.36
0.59
0.68
n/a
0.47
6
Repeatability limit in SMPR
≤6%
≤6%
≤6%
n/a
≤6%
7
Repeatability relative standard deviation
RSD
r
1.6
2.5
2.5
n/a
2.1
8
Reproducibility limit in SMPR
≤11%
≤11%
≤11%
n/a
≤11%
9
Reproducibility relative standard deviation
RSD
R
4.8
5.0
4.5
n/a
4.4
10
HorRat value
0.7
0.6
0.6
n/a
0.6
a
Less than 2/9 laboratories removed from statistical analysis
.
