每日一练 | Data Scientist & Business Analyst 面试题 144

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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 44 DS Interview Questions What is the goal of A/B Testing? 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. 欲知答案如何？请见下期分解！ Day 43 答案揭晓 DS Interview Questions Give some classification situ ………………………………