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Questions related from Michal S. Karbownik
I plan to carry out a survey research that will model a certain variable with other pre-specified variables. As this is not an intervention study, I am not obliged to register the study to such a...
10 October 2019 2,715 5 View
This is advised nowadays to submit a dataset to a publicly available repository (eg. Mendeley) before publishing a paper done on these data. Can I reuse such a repository dataset to publish my...
01 January 2019 9,229 3 View
The effect size in statistics reflects the magnitude of a measured phenomenon. It may be expressed as a coefficient of determination (R2), which states how much variance can be explained by the...
12 December 2018 1,756 5 View
Hello! Does anybody know any free software to build an illustration of the confirmatory factor analysis model (like in the attachment)? I use STATISTICA to perform the analysis itself, but it...
07 July 2018 9,930 3 View
Dear All, Does anybody have an access to the full text of "Neuroscience meets salivary bioscience: An integrative perspective." by Segal SK, published in Behav Neurosci. 2016; 130(2): 156-75....
02 February 2018 695 0 View
The best suggested method to internally validate a Cox regression model bases on bootstrap resampling technique with subsequent assessment of discrimination and calibration performance of...
12 December 2017 1,591 4 View
While assessing intra-assay coefficient of variation (CV), it is generally advised that CVs should be calculated from the calculated concentrations rather than the raw optical densities. If the...
12 December 2017 5,591 6 View
While preparing a scientific paper one may experience a mess with citations. Especially during adding and removing a citation and because various formats of references exist. Could you please...
07 July 2017 1,727 3 View
Some scientific journal editors allow to publish original research as short communications (or brief reports, research snapshot, etc.). This applies to projects of smaller scope and/or significant...
07 July 2017 9,421 1 View
WinMICE is a software designed to impute multilevel missing data. http://www.stefvanbuuren.nl/mi/Software.html It is a free software, however, I need a manual to use it. Does anybody have it and...
07 July 2017 4,156 1 View
In an upcoming issue of Nature Human Behavior, Daniel Benjamin and colleagues propose a new p-value threshold 0.005 instead our current dogma of 0.05. They claim that it will reduce false positive...
07 July 2017 6,558 43 View
The effect of electromagnetic field on human health is being undervalued. Especially the fields of extremely low frequencies (electric power) as well as radio frequency communications (cell phone,...
02 February 2017 4,193 6 View
Using the qPCR procedure, this is well established how to calculate a fold-change for an individual sample: 2^-ddCt = 2^-dCt(tissue1) / 2^-dCt(tissue2) which is equal to = 2^(-dCt(tissue1) -...
01 January 1970 4,785 2 View
How high the Cronbach's alpha should be to be recognized as satisfactory? Majority of sources say 0.7. Does the purpose of a questionnaire make the difference: research or diagnosis? Any...
01 January 1970 4,139 10 View
During the process of a questionnaire translation from an original language - after accurate translation - you need to validate it in a target sample in order to confirm similar structure in...
01 January 1970 2,438 5 View
During the process of questionnaire translation and validation, the original readability of the items should be maintained. How much testing of readability of a translated version of questionnaire...
01 January 1970 3,561 6 View
