Unit 1 Codes

Which of the following code would you enter to load the cdc data?

• Data(cdc)

• data_cdc

• data(cdc)

• data.cdc

Which of the following codes would you enter to display the cdc data?

• view(cdc)

• View(cdc)

• view_cdc

• view.cdc

Which code(s) could you enter to determine the number of rows are in the cdc data file? Choose all that apply.

• dim(cdc)

• nrow(cdc)

• ncol(cdc)

• names(cdc)

Which code(s) would you enter to determine if a variable in the cdc data file was numerical or categorical?

• data(cdc)

• dim(cdc)

• nane(cdc)

• str(cdc)

Which code(s) could you enter to determine the names of the variables in the cdc data file?

• dim(cdc)

• View(cdc)

• Names(cdc)

• str(cdc)

Which of the following codes would be entered to make a subset of all the males in the cdc data file and name it cdc_males? Choose only one.

• 
  cdc_males = filter(cdc, gender == "Male")

• cdc_males <-filter(cdc, gender = "Male")

• cdc_males <-filter(cdc, gender == Male)

• cdc_males <-filter(cdc, gender == "Male")

Which of the following functions would you need to use to change the name of a variable in a data file?

• name

• rename

• Name

• Rename

Which of the following codes would you use to make a two-way frequency table?

• tally(gender, data = cdc)

• tally(gender~asthma, cdc)

• tally(gender | asthma, data = cdc)

• 
  tally(gender~asthma, data = cdc)

Which of the following plot functions could you enter to make a plot for a categorical variable? Choose all that apply.

• histogram

• bargraph

• dotPlot

• xyplot

Which of the following codes would you enter to make a scatterplot showing the relationship between height and weight faceted by asthma and a 3 column layout?

• xyplot(weight ~ height | asthma, data = cdc)

• xyplot(weight ~ height, asthma, data = cdc)

• xyplot(weight ~ height | asthma, data = cdc, layout = c(3,1))

• 
  xyplot(weight ~ height,  data = cdc, group = asthma, layout = c(3,1))