Final answer:
To create the indicator variable 'eversmoke' that equals 0 if the miner never smoked, equals 1 if the miner ever smoked, and is missing if smoking history is unknown, you can use the provided code.
Step-by-step explanation:
To create the indicator variable 'eversmoke' that equals 0 if the miner never smoked, equals 1 if the miner ever smoked, and is missing if smoking history is unknown, you can use the following code:
eversmoke = 0 # initialize the variable
if smoking_history == 'never smoked':
eversmoke = 0
elif smoking_history == 'ever smoked':
eversmoke = 1
else:
eversmoke = None
In this code, 'smoking_history' is the variable that represents the miner's smoking history. The code checks the value of 'smoking_history' and assigns the appropriate value to 'eversmoke' accordingly.