Useful tips for everyday
How do you prove pairwise independent? Events A, B, and C are mutually independent if they are pairwise independent: P(A ∩ B) = P(A) ×…
What is inverted U shaped relationship? In motivation: The inverted-U function. The relationship between changes in arousal and motivation is often expressed as an inverted-U…
What is the variance of rolling a dice? When you roll a single six-sided die, the outcomes have mean 3.5 and variance 35/12, and so…
What is the L0 norm? The L0 norm counts the total number of nonzero elements of a vector. For example, the distance between the origin…
How do you show that T is not a linear transformation? BASIC FACTS: If T is a linear transformation, then T0 must be 0. (So…
Why are the results of cv.glmnet always random? This is why when you use n f o l d s = n the results don’t…
What is a complement in statistics and probability? The complement of an event is the subset of outcomes in the sample space that are not…
How does nltk sentence tokenizer work? Tokenization is the process of tokenizing or splitting a string, text into a list of tokens. One can think…
Do chi-square statistics follow a normal distribution? The Chi-Square Test for Normality allows us to check whether or not a model or theory follows an…
Is a B testing quantitative or qualitative? A/B tests are quantitative tests that work with a single variable. Most of the time, you only need…