Type & Coercion Errors

NAs from coercion

Matches: NAs introduced by coercion

WHAT THIS ERROR MEANS

R tried to convert values to another type (usually numeric) but some values couldn't be converted, so they became NA.

1. Check your data for non-numeric entries (letters, special characters).

2. Clean the data before converting.

3. Use suppressWarnings() if you expect and accept the NAs.

BAD — THIS CAUSES THE ERROR

as.numeric(c("1", "2", "three"))

GOOD — CORRECT APPROACH

# Clean first:
x <- c("1", "2", "three")
x[x == "three"] <- "3"
as.numeric(x)

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