每日一练 | Data Scientist & Business Analyst 面试题 145

大数据应用 · 公众号 · 大数据 · 2017-07-30 09:06

正文

从6月15日起，数据应用学院将与你一起温习数据科学（DS）和商业分析（BA）领域常见的面试问题。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 45

DS Interview Questions

What are Boosting and Stacking?

BA Interview Questions

R language:

Write a while loop starting with x = 0.

The loop prints all numbers up to 35 but it skips number 7.

欲知答案如何？请见下期分解！

Day 44 答案揭晓

DS Interview Questions

What is the goal of A/B Testing?

It is a statistical hypothesis testing for randomized experiment with two variables A and B. The goal of A/B Testing is to identify any changes to the web page to maximize or increase the outcome of an interest. An example for this could be identifying the click through rate for a banner advertisement.

BA Interview Questions

R language:

You have the data.frame ‘mydf’ with four columns like below.

a = c(3,7,NA, 9)

b = c(2,NA,9,3)

f = c(5,2,5,6)

d = c(NA,3,4,NA)

mydf = data.frame(a=a,b=b,f=f,d=d)

mydf

## You want to add another column ‘5’:

## the 5th column contains the value of col b if col a is NA;

## the 5th column contains the value of col d if col b is NA;

## the 5th column contains the value of col f in all other cases.

数据应用学院

数据应用学院（Data Application Lab）, 北美第一家培训－项目实习－职业辅导－内推一站式专业数据人才输送机构，提供大数据和数据科学培训和公司项目解决方案，由南加州与硅谷的高级数据科学家与数据工程师联合创办，致力于传播数据行业最新应用和知识、培训及输送优秀大数据人才，以填补人才缺口、充分发挥大数据在商业中的力量。2016年被北美著名科技杂志Tech Beacon评为Top Data Camp。