﻿ Performing Bias/Interaction analysis

Performing Bias/Interaction analysis

When bias analysis has been requested in one or more Model= statements, then a secondary analysis is performed for each model with bias interactions ("B") specified.

Bias/Interaction analysis specified by Model: ?B,?B,?,CREATIVITY

There are as many bias analyses as there are Model= statements with "B"s

There are empirically 21 Bias terms

There is one term for each element combination from the two facets.

Table 9.1  Bias Iteration Report

Iteration    1  BIAS                       max.=   -13.0 -144.     max.= -1.000

|

2 more Bias iterations

|

Iteration    4  BIAS                       max.=      .0    .0     max.=   .000

Column headings have the following meanings:

Model:= Specification of bias model, reported over the number and label of each element interacting to estimate a bias term.

No.= Sequence number of bias term.

Score

Raw= Observed integer score for this interaction of elements.

Expected= Score expected based on current bias estimate.

Residual= Difference between observed Score and Expected score

Logit Measure

Value= Revised estimate of bias in log-odds units (logits).

Change= Change in logit bias estimate from logit estimate of the previous iteration.

Estimate mean =mean value of the bias estimates for this model, usually near 0.0.

S.D.=sample standard deviation of the estimates, which is not constrained to any value.

Count =number of reportable bias estimates

max.=Is the maximum change or residual for any element.

Iteration=The number of times BIAS has been applied to the data.

BIAS=A Newton-Raphson, residual-score to logit, estimation routine

Fit statistics are computed for the bias terms, and then results are reported:

Calculating Bias fit statistics

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