Table 9: Validity of the Teachability Index

Linear regression with NAEP reading (scale scores)

Teachability Index

0.275***

Spending per Pupil

0.00001

Linear regression with NAEP reading (percentage “basic” or higher)

Teachability Index

0.283***

Spending per Pupil

0.0003

Linear regression with NAEP math (scale scores)

Teachability Index

0.340***

Spending per Pupil

0.00005

Linear regression with NAEP math (percentage “basic” or higher)

Teachability Index

0.394***

Spending per Pupil

0.0002

Linear regression with the graduation rate

Teachability Index

0.298***

Spending per Pupil

0.0003

Note: * = significant at p<=0.10; ** = significant at p<=0.05; *** = significant at p<=0.01.
