Useful tips for everyday
Is the chi-square test directional? Even though it evaluates the upper tail area, the chi-square test is regarded as a two-tailed test (non-directional), since it…
What is the function used to generate a random number based on normal distribution? X = randn returns a random scalar drawn from the standard…
What does the ROC curve tell you? The ROC curve shows the trade-off between sensitivity (or TPR) and specificity (1 – FPR). Classifiers that give…
What is an observable random variable? In statistics, observable variable or observable quantity (also manifest variables), as opposed to latent variable, is a variable that…
Can correlation be useful for prediction Why or why not? Correlation (or any other measure of association) is useful for prediction regardless of causation. Suppose…
What is a stress value? The measure of goodness of fit in multidimensional scaling is called S(caled)-Stress! It measures the difference between the observed (dis)similarity…
How to match propensity score for more than two groups? Propensity Score Matching for more than 2 groups Ask Question Asked4 years, 11 months ago…
Do neural networks need feature selection? Neural networks are themselves often used for feature selection. This is the paradigm leading to deep learning. In that…
Are paired samples independent or dependent? Dependent samples are paired measurements for one set of items. Independent samples are measurements made on two different sets…
How do I make an R code readable? Writing clean and readable R code the easy way First things first. Use RStudio. Use git for…