[R] Replace <NA> with something else

[eric]

I am reading some data into R from an Excel spreadsheet using read.csv. Some
of the original data that comes into column 1 from the spreadsheet is text
that says NA. The NA stands for north america. As it comes in, R converts
the NA over to  <NA>. 

What is the cleanest way to change the <NA>  values to something else. In
other words, get rid of the brackets ? Maybe convert <NA> to NAM. 

635     LA 201207  557329
636     LA 201208  683771
637     LA 201209  613851
638     LA 201210  764217
639     LA 201211  212897
782   <NA> 200701  875634
783   <NA> 200702  614856
784   <NA> 200703  521520
785   <NA> 200704 1406400



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