Stairs on Suspended Shoe Rail

Shoe Rail on Rough Stringer

                    

 

These Stairs are similar to in the rough with the post, but with the balusters mounted into a suspended "Shoe Rail", were they don't touch the floor.
If you have open end treads like pictured, and don't plan on replacing your carpet soon, this is the best option for you.

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Also the shoe rail can be installed on a rough stringer as in the picture on the right also know as a open riser stairs, and or "Brady Bunch Stairs" common on 70's homes.
And this particular configuration is very common.