The name is absent



Table 1

Variation in Skills by Level of Geography

Sum
of Squares

Percent Decrease
in Variation

Cumulative
Decrease

Undifferenced Years of Teaching

Experience

80800.06

Skill Measure Differenced by:

State

73627.46

0.09

0.09

State-Metropolitan Area

70944.33

0.04

0.12

State-Metropolitan Area-School District

65317.86

0.08

0.19

Undifferenced Years of Previous

Principal Experience

52199.28

Skill Measure Differenced by:

State

48259.75

0.08

0.08

State-Metropolitan Area

45756.94

0.05

0.12

State-Metropolitan Area-School District

40619.39

0.11

0.22

The unit of observation is the individual principal; the sample size is 1,605. The sample includes
those principals within school districts that record at least four within the data.

14



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