Table 2.

Comparison of the capabilities of various metrics.

Metric Capability	Standard Scores	Raw Scores	Age Equivalent Scores	GSVs
Out-of-Level testing (chron. age above the age ceiling of the test)	No	Yes	Yes For AEs ≤ age ceiling	Yes
Meaning to clinicians, families, researchers	Yes	No	Yes	No
Comparison across tests	Yes	No	Yes	No
Measure developmental change qualitatively	No	Yes	Yes	Yes
Measure developmental change quantitatively (Equal intervals between measurements)	No	No	No	Yes
Standard error of measurement available	Yes	Yes	No	Yes