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

equivalence zone

a variable ratio of antigen and antibody which results in precipitation in which there is no unbound antibody or antigen.
References in periodicals archive ?
These multiple subjective equivalence points at different delays are then used to estimate the temporal discounting function (Equations 1 & 2).
In the reward condition, 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 order of descending value, and (b) the value at which the participant switched preference from the delayed to the immediate reward when the rewards were presented in order of ascending value.
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.
Correlations between equivalence points in the cost and reward conditions.
Table 3 Group Equivalence Points in Reward and Cost Condition Cost Reward Equivalence Points Equivalence Points Delay 25th Median 75th 25th 1 week -$500.
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.
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.
Equation 2 accounted for more variance in the individual participants' equivalence points than did Equation 1, which had been reported earlier by Rachlin et al.
Most important for the present purposes, the equivalence points and the discounting parameters were stable and reliable across the two sessions.