In online data, I have tried to use city(Chicago) as a filter variable for 1860. I get syntax errors. What's wrong

In online data, I have tried to use city(Chicago) as a filter variable for 1860. I get syntax errors. What’s wrong

The online data analysis tool can only accept numeric codes, which is why you are seeing a syntax error. To find the numeric code for Chicago, either click on or type city into the “Selected:” box and click view. Find Chicago in the alphabetical list and take the bold-face number immediately to its left. So to filter on Chicago, you would type city(1190) into the Filter: box.

I hope this helps.