Useful tips for everyday
What are the different methods used to measure correlation between two variables? The Pearson correlation method is the most common method to use for numerical…
What is a time-varying variable? Time-varying covariates are variables whose values can change across time. Although the value of the TVC changes across time, the…
What type of correlation should you use to compute the correlation between two ordinal level variables? The correlation coefficient between two ordinal variables can be…
What is MMRM analysis? MMRM analyses test the endpoint hypothesis or hypothesis specified at each time point; however, random-effects PM models analyses test either the…
Is linear regression ordinary least squares? Ordinary Least Squares regression (OLS) is more commonly named linear regression (simple or multiple depending on the number of…
Why is the hazard ratio a function of time? Since the hazard is a function of time, the hazard ratio, say, for exposed versus unexposed,…
How do you calculate systematic uncertainty? For example, for the A3CSH system, the random error was treated as the averaged uncertainty of the reference acids…
When do you use a loss function in statistics? Loss function. In statistics, typically a loss function is used for parameter estimation, and the event…
What method of testing is done to detect faults and problems? The most common technique for detecting faults is the time-frequency analysis technique. How do…
What is the probability of passing a multiple choice test? A multiple choice exam has 175 questions. Each question has 4 possible answers. Only 1…