Type & Coercion Errors

Argument not numeric or logical

Matches: argument is not numeric or logical

WHAT THIS ERROR MEANS

A function that expects numbers (like mean, sum, sd) received non-numeric data such as character strings.

1. Check the column type with class(your_data$column).

2. Convert to numeric: as.numeric(your_data$column).

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

BAD — THIS CAUSES THE ERROR

mean(c("1", "2", "3"))  # character vector

GOOD — CORRECT APPROACH

mean(as.numeric(c("1", "2", "3")))

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