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Dears, I'm a college student and In doing my statistics homework. I use R with SEM package as my tool for sem analysis, but my teacher told me AMOS is more suitable for such analysis. Could someone help tell me whether it is true that some commercial software is better accepted in academic fields? Sorry if I should not post such topics here. -- Best Regards, Reeyarn T. Lee Accounting

Hi, I want to run something like SELECT firm_id, count(*), mean(value), sd(value) FROM table GROUP BY firm_id; But I have to write a for loop like for ( id in unique(table$firm_id ) { print(paste( id, mean(table[firm_id == id, "value"]) )) } Is there any way to do it easier? Thanks :) Best, Reeyarn Lee [[alternative HTML version deleted]]