How to use the Calclated coloumns at MOSS list

ok, just have learn new some litter knowledge at MOSS list then want to document it so just document it at here to share.

example you have one list as below:

Number in rom (for user to edit)	Number in English (this is calculated type column)
1	One
2	Two
3	Three

what you need to do is just create the column at the list with name Number in english, type in the formula as below:
=IF([Number in rom]="1","One",IF([Number in rom]="2","Two"), IF([Number in rom]="3","Three"))

Done!!

so user every time edit the data at Number in rom , the second column will auto change.