Useful tips for everyday
What are the properties of expectation in statistics? This property states that if there is an X and Y, then the sum of those two…
What is control group and test group? An experimental group is a test sample or the group that receives an experimental procedure. This group is…
How to calculate Cox model using censored data? Blue curve marks model estimated on the full dataset, in the middle plot you can see censored…
What is Sxy in linear regression? To measure the strength of the linear relationship between X and Y the sample correlation coefficient r is used.…
What is a sum contrast? This means that if there are 2 levels within a categorical factor, they would be coded as 0 (first or…
How are standard errors in fixed effects models different? We also briefly discuss standard errors in fixed effects models which differ from standard errors in…
How do you test for a nonlinear relationship? CANOVA and MIC can both be used to test nonlinear correlation; however, CANOVA has its own advantages.…
Is there a simple test for uniform distributions? Then your test statistic will be D n = sup | F ( x) − F n…
How to estimate odds ratio for an interaction? Note that when a variable is involved in an interaction there isn’t a single odds ratio estimate…
How does the Metropolis algorithm work? The Metropolis Hastings algorithm is a beautifully simple algorithm for producing samples from distributions that may otherwise be difficult…