Variable Names (Identifiers) - R (Variable Names)

Question 1

29) Rules for R variables are:
A variable name must start with a letter and can be a combination of letters, digits, period(.) and underscore(_). If it starts with period(.), it cannot be followed by a digit.

Answer 1

Legal Variable Names

Question 2

30) Rules for R variables are: A variable name cannot start with a number or underscore (_)

Answer 2

Illegal 8 or _

Question 3

31) Rules for R variables are: Variable names are case-sensitive (age, Age and AGE are three different variables)

Answer 3

(age, Age and AGE) !=

Question 4

32) Rules for R variables are: Reserved words cannot be used as variables (TRUE, FALSE, NULL, if…)

Answer 4

Illegal (TRUE, FALSE, NULL, if…)

Question 5

33) Forbidden Names (Illegal) for R variables are:

Answer 5

2myvar, my-var, my var, _my_var,
my_v@ar, TRUE

Question 6

34) Remember that variable names are case-sensitive!

Answer 6

(age, Age and AGE) !=