Error of omitted data in R although using na.omit()?

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i used na.omit() to omit NA data, however, every time i got a warning message of removal some rows containing missing data such as this one.

Removed 201 rows containing missing values (geom_point) can any one explain why this happens and how to avoid it? thanks in advance

asked 40 secs ago

R newbie

1

Error of omitted data in R although using na.omit()?