Useful tips for everyday
Are non invertible matrices linearly independent? Theorem 6.1: A matrix A is invertible if and only if its columns are linearly independent. If A is…
How is the z-score connected to the standard deviation of a normal distribution? z = (x – μ) / σ For example, let’s say you…
What are the pre requisites for machine learning? Prerequisites and Prework Algebra. Linear algebra. Trigonometry. Statistics. Calculus (optional, for advanced topics) Python Programming. Bash Terminal…
Is standard deviation always normal distribution? Standard normal distribution: a normal distribution represented in z scores. The standard normal distribution always has a mean of…
Why is my ROC curve a straight line? Therefore, a completely random classifier’s ROC curve is a straight line through the diagonal of the plot.…
Is sigmoid linear or nonlinear? Sigmoid takes a real value as input and outputs another value between 0 and 1. It’s easy to work with…
Can one use a MCMC algorithm in certain circumstances? Can one use an MCMC algorithm in certain circumstances, as outlined in the paper, to extract…
Can a moderator also be a predictor? In some regression model Y=f(x1,…,xp)+ϵ, all the variables on the RHS are needed to make predictions for Y,…
How does a random forest classification model work? In a Random Forest, where there are several trees, a tree would also be made considering feature…
What is the null sampling distribution? A null distribution is the (frequency/ probability /sampling) distribution of the test statistic, assuming the null is true. The…