Exact(7)
The first type of evidence is based on tests of parameter instability over the period 1999Q1 2015Q4.
Looking beyond the usual measures of fit and adequacy, residual analysis revealed nothing out of the ordinary and tests of parameter coefficients significance all looked satisfactory.
Because the data had a hierarchical structure (i.e. growth rings within discs, within trees, within stands), a mixed-modelling approach was adopted to ensure that appropriate estimates of parameter standard errors were obtained and tests of parameter significance were valid (Pinheiro and Bates [2000]).
Tests of parameter differences between males and females were carried out using a single-sample analysis, stratified by gender.
To explore sex differences, we estimated multi-group models separating daughters and sons and tested possible differences with Wald tests of parameter constraints.
All analyses were performed using SAS® PROC MIXED [ 7] with Maximum Likelihood estimation, and tests of parameter estimates were performed using likelihood ratio tests.
Similar(53)
If the model can be estimated, focus turns to evaluations of the degree to which the model accounts for the data (i.e., fit), and estimates and tests of parameters in the model.
§From Wald tests of parameters of logistic regression model.
In addition to these tests of parameters, we also investigated two special cases, i.e. all-hot and all-cold.
We performed the Wald χ test of parameter equalities for gender group differences in the structural regression paths.
Although the path from paternal symptoms to sons' symptoms was not significant, this path was not significantly different for daughters and sons (Wald test of parameter constraints (1) = 0.159, p = .69).69
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