Thank you all!!   :-) 

rlearner309 wrote:
> I have a question about how to filter the data frame:
> Suppose my data frame has variables like gender, age,... How to get a
> subset of the data frame, with only female (or male) and/or age > 50...? 
> What is the typical syntax?  I tried several condition expressions, but
> none of them worked...
> Thanks a lot!

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