Question
What is the difference between type I vs type II error?
Answer
A type I error occurs when the null hypothesis is true, butis rejected. A type II error occurs when the null hypothesis is false, buterroneously fails to be rejected.
Question
What is a statistical interaction?
Answer
Basically, an interaction is when the effect of one factor(input variable) on the dependent variable (output variable) differs amonglevels of another factor.
Question
What is selection bias?
Answer
Selection (or ‘sampling’) bias occurs in an ‘active,’ sensewhen the sample data that is gathered and prepared for modeling hascharacteristics that are not representative of the true, future population ofcases the model will see. That is, active selection bias occurs when a subsetof the data are systematically (i.e., non-randomly) excluded from analysis.
Question
What is an example of a data set with a non-Gaussiandistribution?
Answer
The Gaussian distribution is part of the Exponential familyof distributions, but there are a lot more of them, with the same sort of easeof use, in many cases, and if the person doing the machine learning has a solidgrounding in statistics, they can be utilized where appropriate.
Question
What is the Binomial Probability Formula?
Answer
The binomial distribution consists of the probabilities ofeach of the possible numbers of successes on N trials for independent eventsthat each have a probability of π (the Greek letter pi) of occurring.
Question
What is the importance of Central Limit Theorem
Answer
Suppose that we are interested in estimating the averageheight among all people. Collecting data for every person in the world isimpossible. While we can’t obtain a height measurement from everyone in thepopulation, we can still sample some people. The question now becomes, what canwe say about the average height of the entire population given a single sample.The Central Limit Theorem addresses this question exactly.
Question
How many branches of Econometrics are there?
Answer
Econometrics is divided into theoretical econometrics andapplied econometrics. While theoretical econometrics includes the developmentof appropriate methods for the measurement economic relationships which are notmeant for controlled experiments conducted inside the laboratories, appliedeconometrics includes the application of econometric method to specificbranches of economic theory and problems like demand and supply, production,investment, consumption, etc. It involves data analysis and forecasting.