Useful tips for everyday
How do you calculate hazard rate from median survival? Hazard Rate from Median Survival Time The median survival time is transformed to a hazard rate…
How does a permutation test construct a distribution? A permutation test (also called a randomization test, re-randomization test, or an exact test) is a type…
What bug bites leave two marks? It’s not always easy to see, but a true spider bite will present itself with two puncture marks. The…
What is method and model? Methodnoun. (object-oriented) A subroutine or function belonging to a class or object. Modelnoun. A representation of a physical object, usually…
How do you create a wealth index using PCA? Select variables. Explore variables. Recode into binary variables. Principal components analysis (PCA) Create wealth index quintiles.…
How do you check proportional hazard assumptions? The proportional hazards (PH) assumption can be checked using statistical tests and graphical diagnostics based on the scaled…
What function grows at faster increments? Exponential growth refers to an increase based on a constant multiplicative rate of change over equal increments of time,…
What is PDQ in Arima? A nonseasonal ARIMA model is classified as an “ARIMA(p,d,q)” model, where: p is the number of autoregressive terms, d is…
Can categorical variables be correlated? For a dichotomous categorical variable and a continuous variable you can calculate a Pearson correlation if the categorical variable has…
How do you calculate effect size in meta analysis? In Meta-analysis, effect size is concerned with different studies and then combines all the studies into…