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Systematic error:

x

: SD(m

i,x

)

y

: SD(m

i,y

)

cran

caud

left

right

Mean error:

M

x

: <m

i,x

>

0

M

y

: <m

i,y

>

0

y

x

2

y

2x

4

y

4x

1

y

1x

Random error:

N

i

2

x,i

x

σ

σ

N

i

2

y,i

y

σ

σ

Parameters to describe SYSTEMATIC and

RANDOM errors in the patient population: