I am working with a large data frame (see example below), where a value is missing in the year variable. I assume that the missing value is 2000 and i would like to add it. I don't like the idea to add the value by hand, is there any other possibility?
dataID dataOrigin year breedSummary breedFCI SNP sex age postcode
1 H00-0012 IVPZ-APPX 2000 1018 3 7 1 12 7000
4 H00-0022 IVPZ-APPX NA 1217 1 5 3 9 7514
Many thanks!