EPI III Flashcards
Post hov vs a priori analysis?
Post hoc - analyser som görs i efterhand. Farligt, “if you torture the data long enough it will confess”
A priori - de analyser som du bestämt i förhand, du har en hypotes.
What is a log rank test?
The log-rank test is the most widely used method of comparing two or more survival curves. The null hypothesis is that there is no difference in survival between the two groups.
Main limitations of register based studies
Are that necessary information may be unavailable, data collection is not done by the researcher, confounder information can be lacking, missing information on data quality, truncation at start of follow-up making it difficult to differentiate between prevalent and incident cases and the risk of data dredging.
