Mehdi Osooli

6 Questions 23 Answers 0 Followers

Questions related from Mehdi Osooli

How to calculate age specific incidence rates using stata in longitudinal data model?

I have longitudinal data on registered arthropathy diagnoses for my study subjects including main group and a comparison group. As the data include 22 years of follow up, I want to see the pattern...

17 January 2017 6,635 5 View

How to extract few letters of a string variable in stata?

Dear Colleagues, I have been trying to extract the first three characters of an ICD variable. I tried using the following command: substr(icd_code,1,3) I get an error saying that "unrecognized...

07 March 2016 1,447 13 View

How to back translate regression cofficients of log and square-route transformed ouctome and independent variables?

Hi Evereyone, I was running OLS and had problem of non-linearity of the association in the model. I used then the log and square-route transformations respectively for the outcome and some...

15 November 2015 1,019 10 View

How do I erase multiple imputation setting in STATA?

Doing it for the first time, I used the MI set command and I performed multiple Imputation on my data set. Then I tried to remove the MI set by deleting the new variables and imputed datasets. I...

29 October 2015 789 9 View

How can I create a variable that counts various visits with the time order?

I have a dataset with multiple visits recorded for patients. I want to use only data from enrollment for an analysis. How can I code so I limit the analysis for the enrollment visit?

04 October 2015 4,349 6 View

What are the best methods to anonymously link clinical registry data?

We are performing an international registry. Our database is online and each participating centre has its own user account to a private space in the database. This is like having many registries...

22 October 2013 7,023 8 View