我如何处理消息错误：R 中的意外符号？

Question

I have to design three research questions using the dataset brfss2013 . The second one I am doing is Do people who drink and smoke some days have higher blood pressure than people who don't at all? To view the data before visualizing it, I tried to create a subset narrowing down to people who smoke two or three times a week.

smokers <- subset(brfss2013, smokday2 == 2 | smokday2 == 3, select = c(smokday2, avedrnk2))

I ran the code above and got the following error:

Error: unexpected symbol in "smokday2 == 2 or"**

I tried eliminating the "|" symbol and the second piece of the subset argument making it:

smokers <- subset(brfss2013, smokday2 == 2, select = c(smokday2, avedrnk2))

But then got a table with zero rows. Also, the data frame is very slow and out of sync in Rstudio so I can't examine brfss2013 very easily. It's also huge.

Does anyone know what the issue is here?

Please let me know

Answer 1

Funny story, I found the answer. When I ran and didn't get a syntax error, I got a table with 0 rows. I found out that the data background/overview claims smokday2 has values such as "2" or "3", but when running brfss2013$smokday2 I found that it actually is populated with strings of text such as "Some days", "Not at all", and "Every day". Here is an example of the code I used for a functional subset:

somesmokendrink <- subset(brfss2013, smokday2 == "Some days" & avedrnk2 == c(2:4), select = c(smokday2, avedrnk2))