SophiaPretty

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About SophiaPretty

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Accounting,Algebra,Applied Sciences,Architecture and Design,Art & Design,Biology,Business & Finance,Calculus,Chemistry,Communications,Computer Science,Economics,Engineering,English,Environmental science,Essay writing Hide all
Teaching Since: Jul 2017
Last Sign in: 304 Weeks Ago, 1 Day Ago
Questions Answered: 15833
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  • MBA,PHD, Juris Doctor
    Strayer,Devery,Harvard University
    Mar-1995 - Mar-2002

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  • Manager Planning
    WalMart
    Mar-2001 - Feb-2009

Category > Computer Science Posted 25 Dec 2017 My Price 7.00

compare the money expenditure in mobile

Assume that we want to compare the money expenditure in mobile apps between “android” user group and “ios” user group. 

 

Let’s conduct the analysis. First, download the “buy_activity.dta” file from the following address.

https://www.dropbox.com/s/uf0wftbjshpqo3v/buy_activity.dta?dl=0

 

Second, merge the “buy_activity.dta” data with the “user.dta” data in Datasets 1. Note that the “user.dta” file in Datasets 3 is somewhat big (862MB) and it will take some time to merge them.

 

a) How long did it take to merge them? Please refer to the following R code.

# Start the clock!

ptm <- proc.time()

# Load and merge the two data

buy_activity<-read.dta("buy_activity.dta") user<-read.dta("user.dta")

user_buy_history<-merge(buy_activity, user, by="user_no", all = FALSE)

# Stop the clock!

proc.time() - ptm

 

b) From the experience in (a), why do we need to learn distributed computing skills such as Hadoop?

 

c) Compare the total spending between the two groups. Please refer to the following R code. Was your initial guess right?

t.test(user_buy_history$purch_amount_total[user_buy_history$platform_type=="a ndroid"],user_buy_history$purch_amount_total[user_buy_history$platform_type== "ios"])

 

Answers

SophiaPretty
(5)
Status NEW Posted 25 Dec 2017 01:12 PM My Price 7.00

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