PROBLEM SOLVING USING R - UNIT 5 MCQS

What is the purpose of coordinate vectors in plotting?

• The purpose of coordinate vectors in plotting is to represent the position of points in a graphical space.

• To calculate the area of a shape in a plot.

• To determine the color of the plotted points.

• To create a legend for the graph.

How can you customize graphical parameters in R?

• Adjust parameters by editing the R script directly without functions.

• Use the `par()` function for base graphics or customize themes and aesthetics in ggplot2.

• Use the `plot()` function exclusively for all graphics.

• Customize colors using the `color()` function only.

What are automatic plot types in R?

• 3D plots, contour plots, and radar charts

• Automatic plot types in R include scatter plots, line plots, bar plots, and histograms, determined by the data structure.

• Heatmaps, funnel charts, and waterfall charts

• Pie charts, box plots, and area plots

How do you add titles and axis labels to a plot?

• Add title and labels in the plot settings menu

• Use title('Title') and label('X-axis', 'Y-axis') functions

• Use plt.title('Title'), plt.xlabel('X-axis label'), and plt.ylabel('Y-axis label') in Matplotlib.

• Use plt.set_title('Title') and plt.label_axes('X-axis', 'Y-axis')

What options are available for changing line and point appearances?

• font size and alignment

• Options include color, width, style, and marker type.

• background color and shadow

• opacity and texture

How can you set limits for the plotting region?

• Adjust the plot size with figsize() in Python

• Use xlim() and ylim() in R or plt.xlim() and plt.ylim() in Python.

• Change the axis limits in the plot settings menu

• Use set_xlim() and set_ylim() in R

What is the function of ggplot2 in R?

• To create interactive web applications in R.

• To perform statistical analysis in R.

• The function of ggplot2 in R is to create data visualizations.

• To manage data frames in R.

How does qplot differ from ggplot?

• qplot is simpler and quicker for basic plots, whereas ggplot offers more flexibility and customization options.

• ggplot is a part of the base R package, whereas qplot is a separate library.

• qplot requires more coding than ggplot for complex visualizations.

• qplot is only used for scatter plots, while ggplot can create any type of plot.

What are geoms in ggplot2 and how are they used?

• Geoms in ggplot2 are geometric objects used to represent data visually in plots, such as points, lines, and bars.

• Geoms are functions that calculate summary statistics for plots.

• Geoms are statistical models used to analyze data trends.

• Geoms are data types that store information in ggplot2.

How can you read external data files into R?

• Use write.csv() to export data from R.

• Use load() to read R data files only.

• Use functions like read.csv(), read.table(), readRDS(), or read_excel() to read external data files into R.

• Use print() to display data from external files.