Relation of Chaos equation to the Schedule for the evaluation of individual Quality of Life-direct Weighting Method

Hideaki Yanagisawa


The SEIQoL-DW (Schedule for the Evaluation of Individual Quality of Life-Direct Weighting) method may be misused because of lack of confirmation by scientific theory. It is compared with the representative chaos equation.

Y (n + 1) = p [1 – Y (n)] Y (n)

The Z (m) axis is perpendicular to the "p" and Y (n) axes.

Z (m + 1) = p [1 – Z (m)] Z (m)

From both equations, a three dimensional logistic map is imagined.

[Y (n + 1) / Z (m + 1)] = [1 – Y (n)] Y (n) / [1 – Z (m)] Z (m)

According to "p" that changes from 3.0 to 4.0, the numbers of answers in this equation change to 1, 4, 16, localized chaotic state, and proliferated chaotic state.

 Cue (area), level and weight of the SEIQoL-DW are compared with each group in the localized chaotic state. The erased "p" is considered as a personal ability. Misuse can be avoided provided that the user understands the relation of chaos theory to the SEIQoL-DW.


SEIQoL-DW; Psychotherapy; Misuse; Chaos; Covariation

Full Text:

Chaos Equation



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