每日一练 | Data Scientist & Business Analyst & Leetcode 面试题 362

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DS Interview Question

Describe what is the Artificial Neural Network?

BA Interview Question

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

LeetCode Question

Same Tree

Description:

Given two binary trees, write a function to check if they are equal or not.

Two binary trees are considered equal if they are structurally identical and the nodes have the same value.

Input: 两颗树相同

Output: true

DS Interview Question & Answer

Tell me the process you will use to perform an A/B Testing.

Answer:

Collect Data: Look for pages with low conversion rates or high drop-off rates that can be improved.

Identify Goals: Your conversion goals are the metrics that you are using to determine whether or not the variation is more successful than the original version.

Generate Hypothesis: Make the hypothesis for the plan you think it will improve the webpage

Create Variations: Make the desired changes to an element of your website or mobile app experience.

Run Experiment: Kick off your experiment and wait for visitors to participate! At this point, visitors to your site or app will be randomly assigned to either the control or variation of your experience. Their interaction with each experience is measured, counted, and compared to determine how each performs.

Analyze Results

BA Interview Question & Answer

R Programming: How do you assess the results of a logistic regression analysis?

Answer:

You can use different methods to assess how good a logistic model is

Concordance - this tells you about the ability of the model to discriminate between the event happening and not happening.

Lift - it helps you assess how much better the model is compared to random selection.

Classification matrix - helps you look at the false positives and true negatives.