st: if command

["Danielle H. Ferry" <dferry@nber.org>]

Hi,

Can anyone please explain when the if command requires quotes around the 
expression and when it does not?

For example, I've found the following seemingly quirky behavior:

1) if "`1'"=="aRate" | "`1'"=="bRate" | "`1'"=="pRate" --> requires quotes
2) if `1'==aRate --> does not require quotes
3) if "`1'"=="apRatio" --> requires quotes

Danielle Ferry

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