Useful tips for everyday
How to calculate conditional probability distributions in statistics? Given this table of probabilities, we can calculate conditional pmf values: Note that we can write pX…
How do you find the expected value of a product? The expected value of the sum of several random variables is equal to the sum…
Is Dunnett a post hoc test? For multiple comparions ANOVA is applied with post hoc tests for comparison. If you want to compare the treatment…
How many parameters does the normal distribution have? two parameters The standard normal distribution has two parameters: the mean and the standard deviation. What does…
Why is it that we use n-1 instead of N when we compute the standard deviation of a sample? The n-1 equation is used in…
What is first difference in panel data? In statistics and econometrics, the first-difference (FD) estimator is an estimator used to address the problem of omitted…
Who invented significance testing? In the 1920s, Ronald Fisher developed the theory behind the p value and Jerzy Neyman and Egon Pearson developed the theory…
Why is linear regression better? Regression analysis allows you to understand the strength of relationships between variables. Using statistical measurements like R-squared/adjusted R-squared, regression analysis…
How do you make a time series data stationary? Should you make your time series stationary? Generally, yes. If you have clear trend and seasonality…
What is normality of error term? Normality of error terms is a basic assumption in applying statistical procedures. For example in linear regression models most…