We obtain a five-step approximation to the quasiperiodic dynamic scali
ng function for experimental Rayleigh-Bernard convection data. When er
rors are taken into account in the experiment, the f(alpha) spectrum o
f scalings is equivalent to just two of these five scales. To overcome
this limitation, we develop a robust technique for extracting the sca
ling function from experimental data by reconstructing the dynamics of
the experiment.