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

Star Schema.

http://en.wikipedia.org/wiki/Star_schema

Works well for high-dimensional data.

If the cardinality of your fact table is close to the product of your dimension sizes, you have dense data.

If the cardinality of your fact table is smaller than the product of your dimension sizes, you have sparse data.

In the middle you have a judgement call.