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Table 2 PLS1 method to estimate the correct classification (%) of virus infection in E.festucae isolates

From: A spectroscopy approach to the study of virus infection in the endophytic fungus Epichloë festucae

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
  1. 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
  2. a Number of PLS factors
  3. b Multiplicative scatter correction
  4. c Standard normal variate
  5. d First derivative
  6. e Second derivative