3.10. Statistical Analysis

Correlation analysis and principal component analysis (PCA) was performed using Statistica (data analysis software system), version 13.1 (StatSoft, Tulsa, OK, USA) on mean values of 20 samples (liqueurs stored for 0, 6, 12, 18 and 24 weeks with and without sugar at 15 °C and 30 °C) and 19 variables: time (w0, w6, w12, w18, w24), temperature of storage (t15, t30), sugar addition (s, ns), antioxidant activity (ABTS), substances reacting with the Folin-Ciocalteu reagent (FC), procyanidin B2 (B2) and total procyanidins and flavan-3-ols (TPC), quercetin 3-rutinoside (Q3R), quercetin (Q), total flavonols (FL), coumaroylquinic acid (CoQA) and total phenolic acids (PA), cyanidin 3-O-glucosyl-rutinoside (C3RG), cyanidin 3-O-rutinoside (C3R) and total anthocyanins (AN), lightness (L*), redness (a*), yellowness (b*) and dominant wavelength (DWL).