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...e of the attribute under measurement. Hence, can use R to test my hypothesis. I'm willing to learn; so if this is very simple, just point me in the direction of any online resources about it. At the moment, I don't even how to define these class of problems? That will be a start. Regards Gawesh [[alternative HTML version deleted]]

...with the ratings allocated as follows: inter-quintile range 100-80% = rating 5, inter-quintile range 80-60% = rating 4, ..., inter-quintile range 20-0% = rating 1) Hence, I need to create a table with fields userid,track,rating: u1,1,1 u1,2, 3 ... Can anybody help me to do this with R? Regards Gawesh [[alternative HTML version deleted]]

...ean or population std. However, what would sense is showing the cdf of the mean. So, I'm thinking of doing this using ecdf(). But what about the standard deviation? How can I include visualise the standard deviation as well as the mean? Would that make sense on just one plot? Any idea? Thanks Gawesh

...eed is a matrix of the plots of each correlation matrix based on the category, ie I have three categories in the data, hence I will need three plots of the correlation matrix in one diagram (because the correlation matrix only makes sense if they are distinguished by category). Any help? Regards Gawesh [[alternative HTML version deleted]]

...3, ..., 3717, 4538 After Googling, got this to work: ecdf(fs$numstudents)(unique(fs$numstudents)) But I don't understand why if the ?ecdf says usage is ecdf(x) ... I need to use ecdf(fs$numstudents)(unique(fs$numstudents)) to get this to work? Can somebody explain this to me? Regards Gawesh