2.1. Experimental design
In a within subjects (repeated measures) design, in which all of
the subjects received all treatments and thus serving as their own
‘control’, six pre-set values were evaluated (low power of radiant
heating, high power of radiant heating, low direct illuminance, high
direct illuminance, low indirect illuminance, high indirect illuminance).
The result of a within subject design is as many data sets as
there are conditions for each subject. This is in contrast with a
between subject design, where all subjects undergo one pre-set
only. Although within subject design can lead to carry over effects,
where subjects responses on later tests are influenced by
their experience in earlier tests, this design was chosen to remove
subject variation associated with individual differences and