equivalence zone

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e·quiv·a·lence zone

in a precipitin reaction, the zone in which neither antibody nor antigen is in excess.
See also: precipitation.
Synonym(s): equivalence point
References in periodicals archive ?
The equivalence points for two individual participants, one each with a relatively high and relatively low degree of cost and reward discounting, are shown in Figure 2.
Rather than analyzing individual participant k values, it is also possible to analyze the data based on median equivalence points of the group of participants (e.g., Myerson & Green, 1995).
Correlations between equivalence points in the cost and reward conditions.
This was true for analyses based on individual participant data and on median group equivalence points and is consistent with previous findings concerning delayed reward discounting (Kirby, 1997; Myerson & Green, 1995, Vuchinich & Simpson, 1998).
These multiple subjective equivalence points are then used to estimate the temporal discounting parameters.
These equivalence points were calculated by averaging two values: (a) the value at which the participant switched preference from the immediate to the delayed reward when the immediate rewards were presented in descending order, and (b) the value at which the participant switched preference from the delayed to the immediate reward when the immediate rewards were presented in ascending order.
Individual participants' equivalence points for both sessions are shown in Figure 1, and descriptive statistics for these data are shown in Table 1.
We assessed the relations across sessions for the equivalence points and the discounting parameters with both correlated group t tests and Pearson correlations.
Equivalence points. The t tests comparing the Session 1 and Session 2 equivalence points at each delay revealed a significant difference only at the 6-month delay (See Table 1); none of the other ts approached significance.
Most important for the present purposes, the equivalence points and the discounting parameters were stable and reliable across the two sessions.