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Questions related from Michal S. Karbownik
Does an entity conducting medical experiments in Germany have to be insured against civil liability? Such a need exists in Poland and I'd like to know whether the same applies to Germany. Thanks...
26 September 2023 4,341 0 View
Hello Everyone, I'm looking for a statistician to collaborate under a meta-analysis manuscript. Interested to join our research team? Please let me know on priv: [email protected]
14 March 2023 9,273 9 View
This has been already more than a half of a year that COVID-19 vaccine is available (Comirnaty). There appears robust data suggesting its safety as obtained from medical event reports from...
19 July 2021 4,249 3 View
These days many of academic teachers around the world have switched to e-teaching due to current epidemiological situation related to SARS-CoV-2. This is a great challenge to both students,...
01 April 2020 2,355 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...
16 January 2019 5,689 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...
06 December 2018 5,313 4 View
Dietary supplements (DS) are estimated to be taken (at least once in a year) by more than a half of the U.S. adult population (Kantor et al. 2016), however, the evidence for their efficacy is...
30 July 2018 5,997 8 View
Advertising may shape purchase behaviour and attitudes towards (or knowledge about) the products. I wonder whether such link exists between susceptibility to advertising dietary supplements and...
27 July 2018 1,079 1 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...
18 December 2017 4,181 5 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...
06 December 2017 9,889 3 View
The opposite data can be found in the Internet about the factors which contributed to decline of infectious diseases: 1) rigorous vaccinations schedules e.g....
17 November 2017 6,697 6 View
In clinical practice I observe combining intravenous furosemide with torsemide. This is in order to force diuresis in patients with severe oedema (20-kg water retention). Is there any rationale to...
20 October 2017 9,839 4 View
Dear Colleagues, Can anybody suggest how to include ordinal multilevel variable (e.g. Likert scale in psychometric studies) as an explanatory variable in Cox proportional hazards model? 1) Should...
08 May 2017 6,359 3 View
I performed two experiments. Firstly, a kinase assay in order to assess the effect of various drugs on enzymatic activity of a certain kinase. This experiment was performed with a recombinant...
11 April 2017 3,880 7 View
There are plenty of psychometric tools to measure the beliefs or attitudes towards anything. What are the real differences between beliefs and attitudes? What are the factors shaping the beliefs...
13 March 2017 6,792 10 View
I would like to identify attitudes towards the use of prescription and over-the-counter medications among patients, health care professionals and medical students. The questionnaire measuring...
09 February 2017 1,856 9 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 9,664 2 View
Dietary supplements are used by roughly a half of an adult population in developed countries. This is despite having minor overall benefits and emerging concerns about their safety. The...
01 January 1970 8,985 21 View
