Dear r-help users,
I am using Sweave and Latex to create tables with output from several
statistical test. As an example: I have a grouping variable "group"
with two levels ("x" and "y") which I compare on variables ("a" and
"b").
I have created a table in which means, standard deviations, and the
statistic and p.value resulting from a t.test is printed. The table
looks something like:
group(x) group(y)
mean sd mean sd t-value p-value sig.
mean(x,a) sd(x,a) mean(y,a) sd(y,a) t.a p.a
mean(x,b) sd(x,b) mean(y,b) sd(y,b) t.b p.b
What I would like to be able to add to this table is an indication by
means of asterisks ("*") the level of significance of the p.value(s).
I am after an expression to put in column "sig." which evaluates the
p.value and prints *, ** or *** depending on it's value (e.g. if it is
less than .05 print "*", but if it is less than .01 print "**", but if
it is less than .001 print "***", else print " ").
I am able to use a simple function like if (p.value<0.5) print("*")
else print(" "),
but I have not been able to work out how to nest the "if" expressions correctly.
Any help would be greatly appreciated.
Best regards,
Tormod Bøe
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