Well you shall consult (surprisingly :-)
?sample function and for rating ?runif function as was pointed out earlier Regards Petr r-help-boun...@r-project.org napsal dne 25.08.2009 05:14:00: > Dear All >  > I know that you do not have to help me (as this is not a pure R problem) but > please do, i am new to R as a CPI compiler, i just need to do a sample to see > which sampling method best works in different situations, therefore since this > is for practice purposes nobody will finance a real project thats why i need > you to help me direct me as to how simulate data (just direct me,not 100% > help). See my attachment for problem formulation, you can even suggest a > different problem and how i can simulate it. >  > Problem Formulation: >  > If I want to measure customer satisfaction on say 5000 business outlets that I > supply with soft drink. The rating is on a 10 scale point where 1 is lowest > and 10 highest. The outlets range from 1 to 5 (1= big supermarkets, 2= medium, > 3= Small, 4 = Mini markets, 5 = corner shops). >  > Data: I have to simulate this sort of data for example >  > > > > > > Outlet type > > > Population N > > Average Buying Power (L/M) > > Combined Average Buying > > Proportions of total buying > > > 1 > > 50 > > 31000 > > 1550000 > > 19.9100835 > > > 2 > > 200 > > 13500 > > 2700000 > > 34.6820809 > > > 3 > > 350 > > 4500 > > 1575000 > > 20.2312139 > > > 4 > > 1000 > > 600 > > 600000 > > 7.70712909 > > > 5 > > 3400 > > 400 > > 1360000 > > 17.4694926 > > > Total > > 5000 > > 50000 > > 7785000 > > 100 > > >  > >  > >  > >  > >  > > >  > >  > > L/M =litres per month > >  > >  >  > This means I have to simulate 50 outlets of type 1 who buy between say 20000 > and 40000 L/M, 200 outlets of type two buying 12000 – 19999 L/M,… etc. > Also I have to simulate ratings randomly from 1 to 10. >  > I really do not know how to simulate data, after simulating I am going to use > dollar stratification to sample this data to get info. I want to compare > different sampling techniques to see which one is best. >  > My objective is to sample from this data in such a way that my company will > benefit from this survey. If I use SRS my survey results may show that > customers are satisfied with average rating of 8, but this sample may not > include my most valued customers who buy 19 to 54 percent of my stock >  > Best Regards > R novice > > > > [[alternative HTML version deleted]] > > ______________________________________________ > R-help@r-project.org mailing list > https://stat.ethz.ch/mailman/listinfo/r-help > PLEASE do read the posting guide http://www.R-project.org/posting-guide.html > and provide commented, minimal, self-contained, reproducible code. ______________________________________________ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
