Home About Us Laboratory Services Forensic Science Communications Back Issues July 2002 Purkait & Chandra, Table 6

Purkait & Chandra, Table 6

Table 6: Cross Test of Sex Determination Accuracy Using Discriminant Function Formulae Derived
from Geographically Diverse Populations
***

Cross validation and comparative group

Sample

Male

Female

Dimensions in Function

N

N

%

N

%

Present study

280

92.0

194/200

96.3

77/80

Maximum length +
Maximum head diameter +
Anteroposterior diameter +
Epicondylar width

Thai formula on Indians
Thai (original study)

280
(103)

63.5
(94.2)

127/200
(65/69)

100
(94.1)

80/80 (32/34)

Maximum head diameter +
Epicondylar width

Chinese formula on Indians
Chinese (original study)

280
(82)

58.5
(81.4)

117/200
(35/43)

100
(87.2)

80/80
(34/39)

Midshaft circumference +
Maximum head diameter

S. A. white formula on Indians
S. A. white (original study)

280
(105)

27.0
(87.5)

54/200
(49/56)

100
(89.8)

80/80
(44/49)

Maximum head diameter +
Epicondylar width

American white formula on Indians
American white (original study)

280
(110)

19.0
(91.1)

38/200
(51/56)

100
(92.6)

80/80
(50/54)

Maximum length +

Maximum head diameter +
Midshaft circumference +
Epicondylar width

*** The following discriminant function formulae were used in this cross testing:

Thai (King et al. 1998) F = 0.3229101* Maximum head diameter + 0.1298626* Epicondylar width –23.86411

Chinese (Iscan and Shihai 1995) F = 0.0876531* Midshaft circumference + 0.2399596* Maximum head
diameter –197.49596

South African white (Steyn and Iscan 1997) F = 0.1467735* Epicondylar width + 0.1817591* Maximum head
diameter –20.11745

American white (Iscan and Miller-Shaivitz 1984) F= 0.30829* Maximum head diameter + 0.08253* Epicondylar
width –0.01607* Maximum length + 0.07202* Midshaft circumference –19.63418


Return to article