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For a given matrix mat, how do you increment every element of the matrix by 3 and return a vector. (I) sapply(mat, function(x,y) sum(x)+y,y=3) (II) sapply(mat, function(x) sum(x)+3)
asked
May 27, 2019
in
Data Handling
#datahandling
DataHandling-questions-answers
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1
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What will the following lines of code return x <- matrix(1:18, 6, 3) apply(x, 2, sum)
asked
May 27, 2019
in
Data Handling
#datahandling
DataHandling-questions-answers
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1
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Which function is used over the margins of an array
asked
May 27, 2019
in
Data Handling
#datahandling
DataHandling-questions-answers
+1
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1
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A hospital data contains patient's age and treatment they are undergoing. Which function can be used to find average of patients undergoing each of the treatments?
asked
May 27, 2019
in
Data Handling
#datahandling
DataHandling-questions-answers
0
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1
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Applying lapply function on a matrix returns
asked
May 27, 2019
in
Data Handling
#datahandling
DataHandling-questions-answers
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1
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Which function is very similar to lapply?
asked
May 27, 2019
in
Data Handling
#datahandling
DataHandling-questions-answers
0
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1
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Which function can be used when a vector needs to be split into groups defined by a classifying factor, compute a function on the subsets, and return the results?
asked
May 27, 2019
in
Data Handling
#datahandling
DataHandling-questions-answers
0
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1
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____ can be used to identify the existence of a matching pattern in a string
asked
May 27, 2019
in
Other
0
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1
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____ is similar to separate() function
asked
May 27, 2019
in
Other
0
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1
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Identify the correct ones
asked
May 27, 2019
in
Other
#datacleansing
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1
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What are the possible outlier treatment
asked
May 27, 2019
in
Other
0
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1
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If value of time is system time which is 2016-12-21 18:33:31 UTC. What is the output for time+60
asked
May 27, 2019
in
Other
0
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1
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Can a variable of factor type be converted to a date type
asked
May 27, 2019
in
Other
0
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1
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What is the class of sys.date() and sys.time()
asked
May 27, 2019
in
Other
0
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Which function(s) of dplyr would you use to first subset the columns and then sort them on a particular column?
asked
May 27, 2019
in
Other
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___ allows to make new variables
asked
May 27, 2019
in
Other
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filter() is for selecting columns and select() is for selecting rows
asked
May 27, 2019
in
Other
+1
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A dataset with columns (country, disease, #ofdeaths) has values Row1 - (CONGO, TB, 28) Row2 - (SPAIN, TB, 2) Row3 - (EGYPT, TB, 0). Is this is a tidy or messy dataset.?
asked
May 27, 2019
in
Other
0
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1
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In a tidy data set ___ forms a row and ____ forms a column
asked
May 27, 2019
in
Other
+5
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1
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Identify the function which is part of dplyr package that helps in previewing the data.
asked
May 27, 2019
in
Other
0
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tail() function shows ___ by default?
asked
May 27, 2019
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Other
0
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Data cleaning is the most time consuming process in data analysis
asked
May 27, 2019
in
Other
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1
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Binning is a method to manage data
asked
May 27, 2019
in
Other
0
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1
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Data munging is
asked
May 27, 2019
in
Other
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