Table 2

PLS1 method to estimate the correct classification (%) of virus infection in E.festucae isolates

Data pre-treatment

2006

(n = 11)

2008

(n = 31)

2006 + 2008

(n = 42)


Fa

Virus

(n = 6)

No virus

(n = 5)

Fa

Virus

(n = 16)

No virus

(n = 15)

Fa

Virus

(n = 22)

No virus

(n = 20)


Raw

4

100

80

1

75

47

6

73

65

MSCb

3

100

80

4

81

60

5

77

70

SNVc

3

100

80

4

81

60

6

82

75

1Dd

2

100

80

1

62

47

5

73

75

MSCb+1Dd

2

100

80

2

81

67

4

73

75

SNVc+1Dd

2

100

80

2

81

67

3

86

75

2De

4

100

100

1

62

53

4

73

65

MSCb+2De

1

100

100

3

75

60

4

73

55

SNVc+2De

1

100

100

3

75

60

4

82

75


Results of the external validation for individual and combined years (2006 and 2008) using different data pre-treatments. Bold type indicates the best classifications obtained for detection of virus infection

a Number of PLS factors

b Multiplicative scatter correction

c Standard normal variate

d First derivative

e Second derivative

Petisco et al. Virology Journal 2011 8:286   doi:10.1186/1743-422X-8-286

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