In Fig. 8(a), there were 5 items (red spots) whoseQDvalue was 2.
This means that experts showed incongruence towards such items.
The mean of 5 items was between 2 and 5. For items with low or
high mean and its QD was higher than 1.5 means, it means that the
opinion of experts was highly different. If mean was low or high
and QD was below 1.5, it means that the opinion of experts was
only slightly different.
Median value shows that each item was likely for several levels:
from the highest, high, moderate, less, and the least. The relationship
between mean and median was not linear for 100%. Items
whose mean was equal but whose median was different means that
the majority of the experts were equal to median. For example (in
Fig. 8(b)), there were 3 questions whose median value was 3. Out of
3 items, the lowest score was 2.63 and the highest score was 3.63.
This means that although the average was different but the
weight for score given by the experts was at moderate level
(median = 3).
All 40 items were analyzed using mean, median, Quartile Difference,
congruence and possibility level. The results from the
statistical data analysis, there were 22 items which experts considered
as more likely to the most likely. There were 9 items which
experts considered as the least likely. This results were useful to
set the direction for indoor thermal environment management in
Thailand’s buildings. Therefore, the development of HVAC in this
research was based on the agreement or congruence of experts to
comply with Thai climate and requirements