besides phpESP we have a genuine PHPNuke-module - created by edogs :: EdogsOpros v1.0.9b :: here some Demos:
here some Demos: [click all]
demo 2 :: demo 3 :: demo 4 :: list of many surveys :: a list of several surveys: pick one and have a closer look :: some in depth stats of a survey [aritmethic calculations]
just ask the above mentioned sites for a copy of EdogsOpros v1.0.9b - and leave it at warp-speed.de and NukeCode.com