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  • Kyaw Moe Aung thinks this is interesting:

By changing words to the lowercase, you can prevent the improper counting of words. Say that you have a count for hockey three times and Hockey once where it is the first word in a sentence. R will not give you a count of hockey=4, but hockey=3 and Hockey=1.

From

Cover of Mastering Machine Learning with R

Note

Explanation about changing lower case.