每日一练 | Data Scientist & Business Analyst & Leetcode 面试题 361

大数据应用 · 公众号 · 大数据 · 2018-05-23 09:09

正文

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MAY

Data Application Lab 自2017年6月15日起，每天和你分享讨论一道数据科学(DS)和商业分析(BA) 领域常见的面试问题。

自2017年10月4日起，每天再为大家分享一道Leetcode 算法题。

希望积极寻求相关领域工作的你每天关注我们的问题并且与我们一起思考，我们将会在第二天给出答案。

Day

261

DS Interview Question

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

BA Interview Question

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

LeetCode Question

Longest Substring Without Repeating Characters.

Description:

Given a string, find the length of the longest substring without repeating characters.

Input: “abcabcbb”

Output: 3

Day

260

答案揭晓

DS Interview Question & Answer

Why we need to do A/B Testing?

Answer:

A/B testing allows individuals, teams, and companies to make careful changes to their user experiences while collecting data on the results. This allows them to construct hypotheses, and to learn better why certain elements of their experiences impact user behavior.

A/B testing can be used consistently to continually improve a given experience, improving a single goal like conversion rate over time.

A/B testing can also be used by product developers and designers to demonstrate the impact of new features or changes to a user experience.