How to replace field value by string if certain condition matched

[sndpgiri]

How do I replace a value for a field if the value is lesser than 0.02 by "Good"?

Value	Key	date
0.02	1	1/1/2017
0.02	1	1/2/2017
0.05	1	1/3/2017
0.02	1	1/4/2017
0.02	1	1/5/2017
0.02	1	1/6/2017

Suppose the value is lesser than 0.02, I want to replace the value by string "Good"

Value	Key	date
Good	1	1/1/2017
Good	1	1/2/2017
0.05	1	1/3/2017
Good	1	1/4/2017
Good	1	1/5/2017
Good	1	1/6/2017

[ITWhisperer]

| eval Value=if(Value<=0.02,"Good",Value)

[sndpgiri]

I get this error: 
Error in 'eval' command: Type checking failed. The '<=' operator received different types.

When I use a single quote outside the value, I get No result

| eval Value=if(Value<='0.02',"Good",Value)

[ITWhisperer]

It is Value that you need to convert to a number for the numeric comparison to work not converting the number to a string

| eval Value=if(tonumber(Value)<=0.02,"Good",Value)