Useful tips for everyday
Are OLS estimators unbiased and consistent? OLS estimators are BLUE (i.e. they are linear, unbiased and have the least variance among the class of all…
What does it mean if the F statistic is significant? Simply put, if you have significant result, it means that your results likely did not…
Does LASSO use cross-validation? Cross-validation can be used in two ways in LASSO: to choose an optimal λ and to assess the predictive error. Why…
How to do a meta-analysis of standardized mean? In studies 5 and 8, the authors only reported the t-statistic from an independent samples t-test comparing…
What is E in covariance? For two random variables x and y having means E{x} and E{y}, the covariance is defined as: Cov(x,y) = E{[…
How do you subtract two confidence intervals? (The lower end of the interval is 1 – 0.1085 = 0.8915 inches; the upper end is 1…
How to use multivariate time series for prediction? Prediction task with Multivariate Time Series and VAR model. T ime Series data can be confusing, but…
How do I analyze a dataset in R? Step 1 – First approach to data. Number of observations (rows) and variables, and a. head. Step…
How do you split a time series? An approach that’s sometimes more principled for time series is forward chaining, where your procedure would be something…
Why is a controlled study important in research? A scientific control group is an essential part of many research designs, allowing researchers to minimize the…