Updated method of replacing all NAs in numeric columns #1
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With most current version of dplyr, replacing NAs with 0 using "mutate_all" applies to character columns as well, which throws a data type error. Replacing with "mutate" + new verbs "across" & "where" to replace NAs only in those columns that are numeric data type. According to dplyr documentation, "mutate" + "across" supersedes "mutate_all".