Is there a good and easy way to visualize high dimensional data?

Question

Can someone please tell me if there is a good (easy) way to visualize high dimensional data? My data is currently 21 dimensions but I would like to see how whether it is dense o

Answer 1

Take a look at http://www.ggobi.org (tours, parallel coordinates, scatterplot matrices) can be used for real-valued variables. Also http://cranvas.org for more recent. The tourr package in R.