11 Questions 21 Answers 0 Followers
Questions related from Michael Dan Arvig
Usually, you use mean (SD) for normally distributed data and median (IQR) for non-normal. However, for certain variables, I think it could seem odd to use median, e.g. for certain continuous...
16 March 2022 4,183 0 View
Which logistic regression model should you use if the outcome variable is numerical/quantitative and discrete, e.g. days, number of readmissions, number of contacts? Normally you use linear...
08 June 2021 4,941 5 View
I'm doing a trial where I have to calculate intra- and interrater agreement with Cohen's kappa. There are 412 measurements/examinations with ultrasound and for each, there are seven binary yes/no...
03 May 2021 1,977 5 View
A central assumption in a crossover trial is the assumption of no carryover effect. I can I test this assumption with mean differences vs. totals plot?
29 April 2020 3,824 0 View
According to the PRISMA statement, you should both rate the risk of bias in the individual studies (e.g. using the Cochrane Risk of Bias Tool or another relevant tool) and across studies. Is the...
23 February 2020 8,072 3 View
Is it a fixed percentage of the total sample or is it calculated (and how)?
16 August 2019 5,705 1 View
Is there any clinical value of performing serial measurements of TAPSE (and size of right sided chambers) in an acute setting, e.g. within hours between the scans? How fast can a change in TAPSE...
15 August 2019 6,151 0 View
In often happens when conducting a systematic review a lot of time passes from the initial search to the point where the final paper is ready for publications. My question is: When should you...
03 July 2019 2,757 4 View
1) Have serial measurements of ejection fraction during an admission been conducted? 2) Does it have any potential clinical benefits?
03 July 2019 2,440 11 View
Is there a carry-over effect when using a mixed-effect model? Example: Trial with two groups: Intervention and controls. The treatment is applied at several time points, and the effect of the...
01 January 1970 8,928 3 View
I have outcome/dependent variable = ordinal, a scale from 0 to 10, about the degree of dyspnea. Two groups = intervention and control. Repeated measurements (4 time points). I heard ANOVA is old...
01 January 1970 3,487 5 View
