this is for holding javascript data
Detlef Ruschin added div_To_foster_the_comparison__.html
over 7 years ago
Commit id: fc1e8a86260fc8836e57bc779642a743e861f374
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To foster the comparison of results between labs, in
ITU-R BT.500 and ITU-T P.919 the experimental setup is prescribed in great
detail. However, in the literature category ratings have been shown to be
severely biased when it comes to the question of quantitative differences
between subjective impressions. This means that numerical quality values thus
derived in the psychophysics lab might not warrant the operation of subtraction
that we are used to perform with numbers. In terms of measurement theory the
reliability of the measurements might be good but their validity is
questionable, if we expect them to result in a so-called interval scale. The
fact that the ITU took great pains to lay down the exact way of choosing and
presenting test materials might therefore be seen as an effort to keep the
unavoidable bias constant rather than to remove it.
