Olivia Sand

3 Questions 3 Answers 0 Followers

Questions related from Olivia Sand

How to increase DPI in my image?

I'm submitting manuscript to a journal that requires 1200 dpi in my images. I have changed the dpi from 96 but when I upload the image with 1200 dpi, the image looks super blurry when I review my...

17 February 2021 3,158 3 View

How to perform a cox regression analysis when time dependent variable?

We are trying to find if there is an association between postoperative pulmonary complications (PPCs) and overall survival in a cohort of 417 patients. In Kaplan-Meier there is a significant...

03 December 2020 7,050 3 View

Should I add previously known risk factors in my regression model?

I'm getting more and more confused the more I read about variable selection in regression analysis, hopefully you can guide me. We are trying to identify risk factors for developing pulmonary...

01 December 2020 3,751 4 View