Two studies have reported on the low sensitivity (41% [ 25], 11% (Wiley, K.: Histology of intraductal lesions – correlation and sampling issues. Lynn Sage Breast Cancer Symposium, Chicago 2003,) [ 26]) of DL for established breast cancer.
Whatever the correlation, the issue should be articulated in the text, and possible explanations provided.
Practical receiver implementation issues including nonideal correlation and synchronization are analyzed and discussed.
These inter-related aspects of exposure are of interest in many epidemiological applications but induce some statistical analytical issues because of correlation and time-dependency.
Although, the direct correlation of issue size to time is not ideal, it is a starting point and provides some information about time duration, which is currently the only information used by team members.
Second, from methodological point of view, as the study has addressed the issue of cross sectional correlation and panel heterogeneity, the findings are more reliable.
We note that the weight should be the correlation; this issue came to our attention when the paper was in press.
In addition to the correlation issue between dysnatremia and mortality, it remains unresolved whether the correction of sodium could reduce mortality, particularly in the presence of several comorbidities.
However, this study considers situations where there is a clear division of profession among specialties, and focuses on multi-chronic patients, so the correlation issue is almost negligible (we observed a low correlation in the data).
(There's vigorous debate over whether unemployment leads to mental distress or whether mental illness causes unemployment, for instance, and the same correlation-causation issue obtains with the other social factors).
