Latgalistikys kongresu materiali, III. 2011. - Latvijas Universitāte

een reduced to four and the eleven-stage scale of the IGVI has been simplified
to a two-point scale (roughly: code moving / not moving). In sum,
we have to do without valuable information about the precise nature of the
change (specified in types 2 and 3, and 4 and 5), although we conserve information
about the direction of change. Similarly, we must forego all the
gradations in the scale of change provided by the IGVI, other than a general
indication as to whether the change is broadly strong or weak in intensity.
It would be possible to obtain a more finely-tuned combined analysis
(in the above-specified conditions up to 11 × 6 = 66 arrow types), but in
this case the categories would almost match reality (which is to be
avoided) and there would be no way to visualize them on a map since there
would be too many colour shades to be interpreted by the human eye.
Below are the eight new categories:
1. code displaying a constant sharp increase
(old type 1 combined with an IGVI>(Max Code/2));
2. code displaying a constant gradual increase
(old type 1+IGVI(Max Code/2))
4. code displaying weak movement with an overall slight tendency to
grow (old types 2 and 3+IGVI