*4.2. Data Extraction from the Survey Database*

Data collected with the VAS matrix was automatically converted to the data matrix *R*, where columns denote the set of criteria, and rows denote the ID of the respondent (Table 3). Records where *rnl* = 0 depict situations when neither of the VAS markers were moved from their default position. We assumed these cases as non-response values.


**Table 3.** Criteria assessments converted from the VAS matrix to the data matrix *R*.

Descriptive statistics of the data collected via the preference elicitation process performed by the VAS Matrix are presented in Table 4. None of the criteria were assessed by all of the 130 respondents analyzed in the study.


**Table 4.** Descriptive statistics of the criteria weighting performed by the VAS Matrix.
