2.3.3. Questionnaires
After the interview mentioned in the section above, participants
were asked to fill in a questionnaire (questionnaire 1) which
included questions to characterise aspects of their wine consumption
and purchase habits as well as to obtain sociodemographic information
(Table 1).
Two weeks after the experiment took place, participants came
to pick up the bottle they had bought and a second questionnaire
(questionnaire 2) was filled in. This was developed in order to measure
the importance they consciously gave to 22 extrinsic characteristics
influencing their quality perception (see Table 5). These
extrinsic characteristics were obtained by decoding the interviews
recorded after the categorization task. Responses were collected in
a four-score scale (0-point = not important and 3-points = very
important).
2.4. Data analysis
For the purchase approach (wine shop) two indices have been
calculated for both choice and auction conditions:
1. Percentage of choice for each wine:
%=n 100/24 with n = number of participants choosing that
wine
2. Average price participants were willing to pay for each wine
(WTP):
Average price = (P1 + P2 + P3 + ... + Pn)/n with P = WTP for each
participant and n = number of participants that have chosen that
wine.
The categorization task results are encoded in a wine
(24) quality level (3) contingency table, in which each cell represents
the frequency of the categorization of a wine in one category
level. The resulting contingency table was analysed by Correspondence
Analysis (CA) by means of SPAD software (version 5.5, CISIACERESTIA,
Montreuil, France). The extrinsic characteristics of the
wines (origin, appelation, vintage, label design, awards, bottling
place) were projected as supplementary variables.