R Programming for Data Mining(dplyr, ggplot2, caret) MCQs

By: Prof. Dr. Fazal Rehman | Last updated: August 7, 2024

dplyr
Which function in dplyr is used to select specific columns from a data frame?
a) filter()
b) select()
c) arrange()
d) mutate()
Answer: b) select()

How do you filter rows based on a condition in dplyr?
a) select()
b) arrange()
c) filter()
d) mutate()
Answer: c) filter()

What is the purpose of the mutate function in dplyr?
a) To sort rows
b) To create new variables
c) To filter rows
d) To select columns
Answer: b) To create new variables

Which function in dplyr is used to sort data?
a) filter()
b) select()
c) arrange()
d) mutate()
Answer: c) arrange()

How do you group data by one or more variables in dplyr?
a) group_by()
b) arrange()
c) filter()
d) mutate()
Answer: a) group_by()

ggplot2
Which function in ggplot2 is used to create a plot object?
a) ggplot()
b) geom_plot()
c) plot()
d) ggplot2()
Answer: a) ggplot()

How do you add a layer for points to a ggplot2 plot?
a) geom_line()
b) geom_point()
c) geom_bar()
d) geom_histogram()
Answer: b) geom_point()

What is the purpose of the aes function in ggplot2?
a) To create a new plot
b) To map variables to aesthetic properties
c) To add a title to the plot
d) To save the plot
Answer: b) To map variables to aesthetic properties

Which function is used to add a title to a ggplot2 plot?
a) ggtitle()
b) title()
c) add_title()
d) plot_title()
Answer: a) ggtitle()

How do you create a histogram in ggplot2?
a) geom_histogram()
b) geom_bar()
c) geom_line()
d) geom_point()
Answer: a) geom_histogram()

caret
What is the primary use of the caret package in R?
a) Data visualization
b) Data manipulation
c) Machine learning
d) Text processing
Answer: c) Machine learning

Which function in caret is used to split data into training and testing sets?
a) train_test_split()
b) createDataPartition()
c) split_data()
d) partition_data()
Answer: b) createDataPartition()

How do you train a model using the caret package?
a) model_train()
b) train()
c) fit()
d) model_fit()
Answer: b) train()

What does the trainControl function in caret specify?
a) The algorithm to use
b) The control parameters for the training process
c) The data to be used
d) The evaluation metrics
Answer: b) The control parameters for the training process

Which method is used to evaluate the performance of a model in caret?
a) predict()
b) evaluate()
c) model_evaluate()
d) resamples()
Answer: d) resamples()

General R Programming for Data Mining
Which function in R is used to read a CSV file into a data frame?
a) read.csv()
b) load.csv()
c) import.csv()
d) open.csv()
Answer: a) read.csv()

How do you display the first few rows of a data frame df in R?
a) head(df)
b) tail(df)
c) first(df)
d) top(df)
Answer: a) head(df)

Which function is used to compute the mean of a numeric vector in R?
a) avg()
b) mean()
c) median()
d) average()
Answer: b) mean()

How do you merge two data frames df1 and df2 by a common column in R?
a) merge(df1, df2, by=”column_name”)
b) join(df1, df2, by=”column_name”)
c) combine(df1, df2, by=”column_name”)
d) bind(df1, df2, by=”column_name”)
Answer: a) merge(df1, df2, by=”column_name”)

Which function in ggplot2 is used to create a boxplot?
a) geom_boxplot()
b) geom_histogram()
c) geom_line()
d) geom_point()
Answer: a) geom_boxplot()

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