Data Collection And Preprocessing - Study Mode

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[#1] Which of the following function is used for casting data frames?

(A) dcast

(B) ucast

(C) rcast

(D) all of the mentioned

Correct Answer

(A) dcast

[#2] Extracting XML is the basis for most web scraping.

(A) True

(B) False

Correct Answer

(A) True

[#3] Which of the following join is by default used in plyr package?

(A) left

(B) right

(C) full

(D) all of the mentioned

Correct Answer

(A) left

[#4] Which of the following package is used for reading JSON data?

(A) jsonlite

(B) json

(C) jsondata

(D) all of the mentioned

Correct Answer

(A) jsonlite

[#5] Which of the following is another name for raw data?

(A) destination data

(B) eggy data

(C) secondary

(D) machine learning

Correct Answer

(B) eggy data