This Page Features MathJax Technology to Render Mathematical Formulae

8/17/2019 This Page Features MathJax Technology to Render Mathematical Formulae

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This page features MathJax technology to render mathematical formulae. If

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R Programming

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R Programmingby #oger $. Peng, Ph$, Je% &ee", Ph$, 'rian (a%o, Ph$

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ABOUT T+E COURSE

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Than" you. +our submission for this ui- was received.

+ou submitted this ui- on Sun $& 1u) *5$6 7879 A/ PDT.

+ou got a score of $:;55 out of *5;55. +ou can attempt again,

if youd li"e.

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!ntroduction

This /rst ui- will chec" your ability to execute basic operations on ob0ects in

# and to understand some basic concepts. 1or uestions 22345 you will need

to load a dataset into # and do some basic manipulations in order to answer

the uestions on the ui-.

+ou may want to print a copy of the ui- uestions to loo" at as you wor" on

the assignment. It is recommended that you save your answers as you go in

the event that a technical problem should occur with your networ" connection

or computer. 6ltimately, you must submit the ui- online to get credit7

Data

The -ip /le containing the data for uestions 22345 in this 8ui- can be

downloaded here9

• :ee" 2 8ui- $ata

1or this assignment you will need to un-ip this /le in your wor"ing directory.

"uestion $

# was developed by statisticians wor"ing at

Your Answer Score Explanation

The University of Auckland (orrect 1.00 The R language was developed by Ross

The University of New South Wales

Harvard University

Microsoft

Total 1.00 / 1.00

"uestion *

https://d396qusza40orc.cloudfront.net/rprog%2Fdata%2Fquiz1_data.ziphttps://d396qusza40orc.cloudfront.net/rprog%2Fdata%2Fquiz1_data.zip


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The de/nition of free software consists of four freedoms ;freedoms 5 through

?T one of the freedoms that are part of the

de/nition@

Your Answer

The freedom to restrict access to the source code for the software.

The freedom to improve the program, and release your improvements to the public, so that the whole community benefi

The freedom to redistribute copies so you can help your neighbor.

The freedom to study how the program works, and adapt it to your needs.

Total

"uestion &

In # the following are all atomic data types EA(EPT

Your Answer Score

numeric

complex

matrix (orrect 1.00

character

Total 1.00 / 1.00


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"uestion 6

If I execute the expression x B C in #, what is the class of the ob0ect Dx as

determined by the Dclass;= function@

Your Answer

complex

matrix

list

numeric (orrect

Total

"uestion 7

:hat is the class of the ob0ect de/ned by x B c;C, T#6E=@


numeric (orrect 1.00 The numeric class is the "lowest common denomina

list

matrix

character

Total 1.00 / 1.00


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"uestion E


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the length of a vector must be less than 32,768

Total

"uestion >

!uppose I have a list de/ned as x B list;4, FaF, FbF, T#6E=. :hat does xGG4HH

give me@

Your Answer

a list containing character vector with the letter "a".

a character vector containing the letter "a".

a list containing the number 2 and the letter "a".

a character vector with the elements "a" and "b".

Total

"uestion :

!uppose I have a vector x B 29C and a vector y B 4. :hat is produced by the

expression x y@

Your Answer

an integer vector with elements 3, 2, 3, 4.

a numeric vector with elements 3, 2, 3, 6.


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a numeric vector with elements 3, 4, 5, 6.

an integer vector with elements 3, 2, 3, 6.

Total

"uestion $5

!uppose I have a vector x B c;


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Month, Day, Temp, Wind

1, 2, 3, 4, 5, 6

Ozone, Solar.R, Wind, Temp, Month, Day (orrect 1.00

Total 1.00 / 1.00

"uestion $*

Extract the /rst 4 rows of the data frame and print them to the console. :hat

does the output loo" li"e@

Your Answer

?-one !olar.# :ind Temp Month $ay 2 K 4C 25.K L2 K 2C 4 2 2


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153 (orrect 1.00 You can use the ̀nrows()' function t

45

160

129

Total 1.00 / 1.00

"uestion $6

Extract the last 4 rows of the data frame and print them to the console. :hat

does the output loo" li"e@

Your Answer

?-one !olar.# :ind Temp Month $ay 24 22 CC K.L 4 45 2< 25 44< .5

?-one !olar.# :ind Temp Month $ay 24 2 2


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"uestion $7

:hat is the value of ?-one in the CLth row@


63

34

18

21 (orrect 1.00 The single bracket [ operator can be

Total 1.00 / 1.00

"uestion $9

)ow many missing values are in the ?-one column of this data frame@

Your Answer

43

9

78

37 (orrect

Total


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"uestion E


13/14

212.8 (orrect

205.0

Total

"uestion E


14/14

97

18

100

Total

This Page Features MathJax Technology to Render Mathematical Formulae

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