Dear list.
 
New to R, I'm looking for a way of using crosstab to output low-dimensional (higher than 2) contingency tables (frequencies, per-cents by rows, % by columns, mean, quantiles....) I'm looking for something of the following sort
 
dataframe: singers, 
categorical variates: voice category (soprano,mezzo-soprano, ...) , voice type( drammatic, spinto, lirico-spinto, lirico, leggero), school (german, italian, french, russian, anglo-saxon, other);repertory (opera, Lieder, oratorio, operetta)
continuous variate: age
 
I would like to tabulate the frequencies (relative percentages)  say in the following way
columns: school Бж repertory
rows :      voice category Бж voice type
 
or to output in the cells of the above table, the statistics (mean/median/quantiles) for age
 
 
I've seen that the function bwplot(age~school | repertory, data= singers, layout=c(4,2)) would do graphically something similar to what I want, but I desire the output also in tabular form
 
Thanks
 
Isotta
 

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