  We describe a generic scheme to extract critical exponents of quantum lattice
models from sequences of numerical data which is for example relevant for
non-perturbative linked-cluster expansions (NLCEs) or non-pertubative variants
of continuous unitary transformations (CUTs). The fundamental idea behind our
approach is a reformulation of the numerical data sequences as a series
expansion in a pseudo parameter. This allows to utilize standard series
expansion extrapolation techniques to extract critical properties like critical
points and critical exponents. The approach is illustrated for the
deconfinement transition of the antiferromagmetic spin 1/2 Heisenberg chain.
