As a validation model of the experimental observations
we used the specialized IBM SPSS version
17 (Statistical Package for the Social Sciences) software
for statistical and chemometric data processing.
Statistical analysis of spectral and nonspectral parameter
dependences was carried out by multiple
regression[17] and correlation task. The correlation
method was used to determine the connection
strength between variables. The bivariate correlations,
partial correlations, and polynomial regression
methods from SPSS were used for statistical investigations.
Two categories of variables were used: the
absorbance measured at fixed wavenumber variables
and the exposure dose. The inverse transformation
of exposure dose was used to produce a new variable
in order to have a linear dependence between
variables, which is a necessary condition for the
Pearson correlation coefficient.