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This study uses the aggregated data from 1979 to 1989 to
build migration models for the migrants employed in the
service industry. The Elimination-by-Aspects model was
estimated to study the relative importance and the influe-
ntial threshold of the locational factors influencing these
migrants.The choice structure is defined as two levels. The
upper level is the choice of region,and the lower one is
the choice of subarea within each region. To compare the
characteristics between the migrants from different regions
and at different temporal periods,this study divides each
sample into three segments by their out-migrant regions and
two segments by their out-migrant time. The emperical results
indicate that the model for the Northern and Central
regions show better fittness than that of the Southern
region . This implies that the more the observations in
the sample choose the alternative with the best attributes,
the better fittness the model would be when using a non-
tradeoff decision making model such as the EBA model. In the
choice of region, the most important factor infl- uencing the
migrants from the northern and centarl regions is the '' ratio
of the service industrial employment''. The influ- ential
threshold is about 61％ of the level in the best alt-
ernative (the northern region). But income variable is the
most important one for the southern migrants. The influential
threshold of the factor'' average current income'' is about 75％
of the level in the northern region.
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