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The statistical significance of a correlation was assessed by a permutation test.
A correlation was assessed between c-erbB-2 positive tumours and histological grade, liver metastases as first site of metastases, disease free survival time (DFS) in the second and third year after diagnosis and overall survival time (OST) in the third and fourth year after diagnosis.
The strength of a correlation was assessed using Cohen's scale 36 in which a correlation, in absolute value, of ≥0.5 was qualified as a strong association, from 0.3 to 0.49 as moderate, from 0.1 to 0.29 as weak, and ≤0.09 as no correlation.
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10.7554/eLife.09115.007 Figure 4. Correlation of total HIV-1 DNA in rectal biopsies and blood ( A ). Correlation was assessed in 46 patients in whom total HIV-1 DNA was detected both in the blood and rectal biopsies, representing patients from three cohorts: SRCV on antiretroviral therapy (ART), Chronic ART, and long-term non-progressors (LTNP).
A pairwise correlation was assessed using Pearson correlation coefficient.
In different studies, a positive correlation was assessed by immunohistochemistry [ 46, 47] and ELISA-based methods [ 48, 49].
However, because matrix elements cannot be considered independent, significance (p-values) was assigned through a randomisation test, where the observed matrix correlation was assessed against a distribution of correlations obtained by 9999 random permutations of the rows and columns of the matrices [43], [69].
Single measure intraclass correlation was assessed as an index of the reliability of a single examiner (r = 0.81) and interrater reliability between all examiners were computed with the average measure intraclass correlation coefficient (ICC) (r = 0.98) [ 13].
Correlation was assessed using a Spearman rank order correlation test as the data set failed the Kolmogorov-Smirnov normality test.
Correlation was assessed using a Pearson's R Correlation test.
Correlation was assessed using a Spearman's rank test.
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