EN
2.3.2023
2.4.2.
Official Journal of the European Union
“Cross-correlation coefficient” (r) means:
where:
2.4.3.
PnÄ1 i¼1 ðxi Ä xÞ Ü ðyi Ä yÞ ﬃﬃﬃﬃﬃ qﬃﬃﬃﬃﬃﬃﬃﬃﬃﬃﬃﬃﬃﬃﬃﬃﬃﬃﬃﬃﬃﬃﬃﬃﬃﬃﬃﬃ r ¼ qﬃﬃﬃﬃﬃﬃﬃﬃﬃﬃﬃﬃﬃﬃﬃﬃﬃﬃﬃﬃﬃﬃﬃﬃ PnÄ1 PnÄ1 2 2 i¼1 ðxi Ä xÞ Ü i¼1 ðyi Ä yÞ
xi
is the measured reference value
yi
is the measured value of the parameter to be verified
x
is the mean reference value
y
is the mean value of the parameter to be verified
n
is the number of values
“Root mean square” (xrms) means the square root of the arithmetic mean of the squares of values and defined as:
xrms
sﬃﬃﬃﬃﬃﬃﬃﬃﬃﬃﬃﬃﬃﬃﬃﬃ n 1X ¼ x2 n i¼1 i
where:
2.4.4.
xi
is the measured or calculated value
n
is the number of values
“Slope” of a linear regression (a1) means:
a1 ¼ where:
2.4.5.
L 66/143
Pn
i¼1 ðxi Ä xÞ Ü ðyi Ä Pn 2 i¼1 ðxi Ä xÞ
xi
is the actual value of the reference parameter
yi
is the actual value of the parameter to be verified
x
is the mean value of the reference parameter
y
is the mean value of the parameter to be verified
n
is the number of values
“Standard error of estimate” (SEE) means: sﬃﬃﬃﬃﬃﬃﬃﬃﬃﬃﬃﬃﬃﬃﬃﬃﬃﬃﬃﬃﬃﬃﬃﬃﬃﬃﬃ Pn 2 i¼1 ðyi Ä ýÞ SEE ¼ nÄ2 where: ý
is the estimated value of the parameter to be verified
yi is the actual value of the parameter to be verified n is the number of values
yÞ