Let's say I have two variables (smoking and lung cancer) that I'm trying to plot on a time series graph.

My data for smoking looks like this: 1990/1991 66,000 people smoked, 1991/1992 75,000 people smoked, 1992/1993 86,00 people smoked

and so on

My data for lung cancer is: 1990 55 000 people developed lung cancer, 1991 80 000 people developed lung cancer, 1992 90 567 people developed lung cancer

and so on

Note: The number of people given in this example is made up. The actual figures were converted to a percentage.

Now, my question is how do I plot the years on the x-axis when one has two years like in smoking and one has only one year like for lung cancer?

Does my scale go like this 1990/1991, 1991/1992, 1992/1993, etc and then use this scale to plot both data points? So I'll use the 1990/1991 to plot both the smoking and lung cancer values (which have been converted to a percentage).

I seriously hope I made sense in what I was trying to say.

• What do the slashes in "1990/1991" etc. mean?
– whuber
Nov 20 '19 at 15:39
• @whuber the slash means between. I was able to get the answer. So every data I had belonged to the first year, not the second one. So my scale for the x-axis was 1990, 1991, 1992, etc not 1990/1991, 1992/1993, 1994/1995 etc
– Cece
Nov 23 '19 at 4:16