Table 3.

Pearson’s r correlations between GPCM content score, IRTree estimated scores, and age.

	${\mathsf{\theta }}_{\mathit{C}\mathbf{,}\mathit{G}\mathit{P}\mathit{C}\mathit{M}}$	${\mathsf{\theta }}_{\mathit{C}\mathbf{,}\mathit{I}\mathit{R}\mathit{T}\mathit{r}\mathit{e}\mathit{e}}$	${\mathsf{\theta }}_{\mathit{E}\mathit{R}\mathit{S}\mathbf{,}\mathit{I}\mathit{R}\mathit{T}\mathit{r}\mathit{e}\mathit{e}}$	Age
${\mathsf{\theta }}_{C,GPCM}$	--
${\mathsf{\theta }}_{C,IRTree}$	.98	--
${\mathsf{\theta }}_{ERS,IRTree}$	.15	.05	--
Age	−.06	−.05	−.16	--

Note: All correlations are significant, p < .05.