Division 13 Method performance characteristics (precision)F1

Statistical results of the interlaboratory test:

• the following tables give the values for anethole.

• The following data were obtained from an international method performance study carried out to internationally agreed procedures.

• Year of interlaboratory test	1998
  Number of laboratories	16
  Number of samples	10
  Analyte	anethole

  Pastis:
  Samples	A	B	C	D	E	F
  Number of laboratories retained after eliminating outliers	15	15	15	13	16	16
  Number of outliers (laboratories)	1	1	1	3	—	—
  Number of accepted results	30	30	30	26	16	16
  Mean value g/l	1,477	1,955	1,94	1,833	1,741	1,754
  Repeatability standard deviation (S r ) g/l	0,022	0,033	0,034	0,017	—	—
  Repeatability relative standard deviation (RSD r ) (%)	1,5	1,7	1,8	0,9	—	—
  Repeatability limit (r) g/l	0,062	0,093	0,096	0,047	—	—
  Reproducibility standard deviation (S R ) g/l	0,034	0,045	0,063	0,037	0,058	0,042
  Reproducibility relative standard deviation (RSD R ) (%)	2,3	2,3	3,2	2,0	3,3	2,4
  Reproducibility limit (R) g/l	0,094	0,125	0,176	0,103	0,163	0,119

  Sample types:

  A

• pastis, blind duplicates

B

• pastis, blind duplicates

C

• pastis, blind duplicates

D

• pastis, blind duplicates

E

• pastis, single duplicates

F

• pastis, single duplicates

Other aniseed-flavoured spirit drinks:
Samples	G	H	I	J
Number of laboratories retained after eliminating outliers	16	14	14	14
Number of outliers (Laboratories)	—	2	1	1
Number of accepted results	32	28	28	28
Mean value g/l	0,778 0,530 (*)	1,742	0,351	0,599
Repeatability standard deviation (S r ) g/l	0,02	0,012	0,013	0,014
Repeatability relative standard deviation (RSD r ) (%)	3,1	0,7	3,8	2,3
Repeatability limit (r) g/l	0,056	0,033	0,038	0,038
Reproducibility standard deviation (S R ) g/l	0,031	0,029	0,021	0,03
Repeatability relative standard deviation (RSD R ) (%)	4,8	1,6	5,9	5,0
Reproducibility limit (R) g/l	0,088	0,08	0,058	0,084

Sample types:

G

• ouzo, split levels (*)

H

• anis, blind duplicates

I

• aniseed-flavoured liqueur, duplicates

J

• aniseed-flavoured liqueur, duplicates.