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Table 1 Significance of correlation coefficients for titers of Citrus exocortis viroid (CEVd) and Hop stunt viroid (HSVd) in four tissues of two citrus cultivars from the field and greenhouse

From: A mutual titer-enhancing relationship and similar localization patterns between Citrus exocortis viroid and Hop stunt viroid co-infecting two citrus cultivars

Correlation coefficients
   CEVd and HSVd
Numbers of citrus plants Tissues Nonparametric methodsa
17 citrus plants All ++b
7 citrus plantsd All ++
11 Blood oranges Roots -c
Rootstock bark ++
Twig bark -
Leaves ++
6 Murcott mandarins Roots ++
Rootstock bark ++
Twig bark -
Leaves -
Double infectionse Roots ++
Rootstock bark ++
Twig bark ++
Leaves ++
12 citrus plantsf (Sets in greenhouse) All ++
  1. aThree nonparametric methods are Spearman’s nonparametric correlation coefficient, Kendall tau rank correlation coefficient and Hoeffding’s inequality
  2. bcorrelation coefficients marked with “++” are statistically significant by all three methods; those marked with “+” are statistically significant by two of three methods
  3. cindicates no significant difference
  4. dThere were no underdetermined values in this data set including 3 Blood oranges and 4 Murcott mandarins
  5. eincludes 5 Blood oranges and 4 Murcott mandarins
  6. fArtificially double inoculated plants include 6 Blood oranges and 6 Murcott mandarins