What do you meant by mis-matched factor levels?

@anindo18 wrote:

Hi, I have some doubt in the blog, that you wrote for R programming
Https://www.analyticsvidhya.com/blog/2016/02/complete-tutorial-learn-data-science-scratch/

. Before I jump on to the doubt directly, I would like to thank you for creating such a useful and comprehensive article on R for people who wants to learn R.
Coming to my doubts. They are as follows:

1. What is the difference between Categorical and Continous variable ?
2. What is the difference between Categorical and Factor variable?
3. Can you please elaborate more on the basics of these classification of the variable?
4. At one place, you have mentioned as :
   > summary(train)

Here are some quick inferences drawn from variables in train data set:

Item_Fat_Content has mis-matched factor levels.

What did you meant by “Item_Fat_Content has mis-matched factor levels”. Please explain.

Thanks,
Anindo

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