Division 9 Method performance characteristics (precision)F1

Results of the interlaboratory test:

• the following table gives the performance for recognition of presence or absence of chalcones in pastis and aniseed-flavoured spirits.

• 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	14
  Number of samples	11
  Analyte	chalcones

  Inconsistent results between the two duplicates, attributed to a sampling error
  Samples	A	B	C	D	E	F
  Number of laboratories retained after eliminating outliers	14	14	14	14	14	13
  Number of outliers (laboratories)	—	—	—	—	—	1 f1
  Number of accepted results	28	14	14	28	28	26
  Number of results for presence of chalcones	28	14	14	0	28	0
  Number of results for absence of chalcones	0	0	0	28	0	26
  Percentage of correct results (%)	100	100	100	100	100	100

  Samples	G	H	I	J	K
  Number of laboratories retained after eliminating outliers	14	14	14	14	14
  Number of outliers (laboratories)	—	—	—	—	—
  Number of accepted results	28	14	14	28	28
  Number of results for presence of chalcones	0	0	0	0	0
  Number of results for absence of chalcone	28	14	14	28	28
  Percentage of correct results (%)	100	100	100	100	100

  Sample types:

  A

• pastis, blind duplicates

B

• pastis, single sample

C

• pastis, single sample

D

• ‘ pastis ’ (not containing chalcones), blind duplicates

E

• ‘ pastis ’ (not containing chalcones), blind duplicates

F

• aniseed-flavoured liqueur (not containing chalcones), blind duplicates

G

• aniseed-flavoured liqueur (not containing chalcones), blind duplicates

H

• ouzo (not containing chalcones), single sample

I

• ouzo (not containing chalcones), single sample

J

• anis (not containing chalcones), blind duplicates

K

• ‘ pastis ’ (not containing chalcones), blind duplicates.