每日一练 | Data Scientist & Business Analyst & Leetcode 面试题 363

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DS Interview Question

Describe the basic layer structure of ANN and what each part represent for.

BA Interview Question

SQL Interview questions practices: Imagine we have two tables names ‘employees’ and ‘projects’, write a query to find out employee name and project name who has assigned more than one project.

LeetCode Question

Maximum Depth of Binary Tree

Description:

Given a binary tree, find its maximum depth.

The maximum depth is the number of nodes along the longest path from the root node down to the farthest leaf node.

Input: root of a tree

Output: max depth

DS Interview Question & Answer

Describe what is the Artificial Neural Network?

Answer:

An Artificial Neural Network (ANN) is a computational model. It is based on the structure and functions of biological neural networks. It works like the way human brain processes information. It includes a large number of connected processing units that work together to process information, which can generate meaningful results from it.

BA Interview Question & Answer

R programming: How do you evaluate the logistic regression? Name the principle of the likelihood ratio test.

Answers:

A logistic regression is said to provide a better fit to the data if it demonstrates an improvement over a model with fewer predictors. This is performed using the likelihood ratio test, which compares the likelihood of the data under the full model against the likelihood of the data under a model with fewer predictors. Removing predictor variables from a model will almost always make the model fit less well (i.e. a model will have a lower log likelihood), but it is necessary to test whether the observed difference in model fit is statistically significant.