Table 2.

Estimates of error components; all measures are for ln(concentration).

Sources1 (SD2)
1 (se)2 (sc)3 (sd)1–3 (sopt-cal)4–5 (sb)4–11 (bias function)
Abbott0.0290.0090.0160.0340.0170.0–0.3
Alpco0.03400.1100.1150.079≈–0.2
Beckman-Coulter0.0120.0190.0940.0970.046≈–0.2
Invitron30.0590.0420.0670.0990.0450.0–0.3
Mercodia0.0240.0280.0720.0810.038≈0
Millipore-ELISA0.0510.0480.0190.0730.091≈0
Millipore-RIA40.08900.0650.1100.1030.2–1.2
Roche0.0200.0220.0400.0500.020−0.1–0.1
Siemens Centaur0.0240.0440.0190.0540.0130.2–0.5
Siemens Immulite350.06600.1450.1590.1000.1–0.5
Tosoh0.0230.0070.0350.0420.0300.15–0.25