R Programming commands

Question 1

How would you calculate Probabilities in R?

Answer 1

Using the “dbinom” function

Question 2

What is the command to carry out a Shapiro-Wilks test?

Answer 2

shapiro.test(sample(residuals(model_1), N, replace=F))

Question 3

How would you make a Histogram in R?

Answer 3

Hist(x, x-axis-label, y-axis-label, main-title)

Question 4

How would you make a boxplot in R?

Answer 4

boxplot(x1~x2, notch=T/F, col=c(colours of boxplots))

Question 5

How would you make a scatterplot in R?

Answer 5

plot(x=x1, y=x2, xlab= , ylab= )

Question 6

What are squared brackets used for in R?

Answer 6

To select or subset data

Question 7

How might you make an ANOVA table in R?

Answer 7

summary(aov(x1~x2, data= ))

Question 8

What does this function;
pt(q, df=30, lower.tail=TRUE)
do?

Answer 8

Calculates the probability that a variable is less than or equal to q

Question 9

What does this function;
qt(p, df=30, lower.tail=TRUE)
do?

Answer 9

Returns a quantile q associated with the probability p being in the lower tail

Question 10

What does “/n” do in R?

Answer 10

Wraps text onto a second line in a title/ axis