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Figure B.1 Gage RR report for Fz measurements on the M1 loads.
or difference between the two force platforms. A formal comparison between the measurement
capability of the two force platforms was made by comparing the variance of the first force platform
with the variance of the second force platform following the procedure of Burdick, Borror, and
Montgomery (2005). A two-factor ANOVA was run for every part and force platform combination
seperately. In order to compare the capability of the two force platforms, the ratio Γ =
γ1
γ2 ,
where
γ1 represents measurement variance of the first force platform and γ2 the measurement variance
of the second force platform, was computed. Then, 95% confidence interval for L < Γ < U was
computed as following.
The γ1 is1,2 :
γ=
2
M SO2 + (n P − 1) × M SO×P
nP
The degrees-of-freedom of the first force platform (DF1 ) is3 :
DF1 =
n2P × γ21
M SO4
nO −1
+
4
(n P −1)2 ×M SO×P
(nO −1)(n P −1)
1
The same for force platform 2 (γ2 ).
M S stands for Mean Square, n stands for total number of, O stands for Operator, P for Parts and O × P for their
interaction.
3
The same for force platform 2 (DF2 ).
2
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