We are analyzing a dataset collected from over 20 hospitals trying to externally validate the qSOFA score to predict in-hospital mortality (PASSEM Study). After days of reading, including this nice dataform, I learned that the development cohort’s regression coefficient is a must to assess calibration and plot calibration plots. I tried for over two months to get the original coefficients from the authors of the development cohort, but I am still waiting for a response (not sure they will respond).
Are the development cohort’s regression coefficients required to assess calibration and plot calibration plots for external validation? If they so and didn’t get them, is it okay to mention in our manuscript that we could not get them.
I came across this excellent topic, but I need help finding an answer to my question.
If any other methods can help us, sharing them would be highly appreciated.