Type & Coercion Errors

Non-numeric argument to operator

Matches: non-numeric argument to binary operator

WHAT THIS ERROR MEANS

You tried to do math (like +, -, *, /) on something that isn't a number, such as a character string or factor.

1. Check the types of your variables with class() or str().

2. Convert to numeric with as.numeric() if appropriate.

3. Make sure you're referencing the right column.

BAD — THIS CAUSES THE ERROR

"10" + 5  # "10" is a string, not a number

GOOD — CORRECT APPROACH

as.numeric("10") + 5

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