每日一练 | Data Scientist & Business Analyst 面试题 150

大数据应用 · 公众号 · 大数据 · 2017-08-04 09:07

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 50

DS Interview Questions

What’s the advantages and disadvantages of decision tree.

BA Interview Questions

R language:

Using the following variables:

x=1

i=c(1:10)

## write a for() loop that increments x by two for each i

欲知答案如何？请见下期分解！

Day 49 答案揭晓

DS Interview Questions

Describe what is a decision tree algorithm.

Decision tree is a type of supervised learning algorithm . It works for both categorical and continuous input and output variables. In this technique, we split the population or sample into two or more homogeneous sets (or sub-populations) based on most significant splitter / differentiator in input variables .

BA Interview Questions

R language:

Use the ‘rivers’ dataset to write a for loop. The loop prints the dataset:

rivers shorter than 500 are a ‘short river’;

rivers longer than 2000 are a ‘long river’;

and rivers in the middle range are printed in their original numbers.

data(rivers)

rivers

rivers$length

str(rivers)

for(i in 1:nrow(rivers)){

if(rivers$rivers[i]<500){rivers$length[i]

else if(rivers$rivers[i]>2000){rivers$length[i]

else{rivers$length[i]

}

str(rivers)

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