Validation of genus and species classification by FT-IR, given as probability for correct identification of strains (repeated determinations).

nref, number of spectra used for reference; nval, number of spectra used for validation. For internal validation, all spectra which had not been included in the reference data set were used.
aThe probability of obtaining uncertain results during repeated determinations is given by the residual to 100%.
bFor identification of T. pyogenes, an external validation was applied using all isolates not included in the reference.