The effect of time upon variability

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100 1 ‡aWoodyard, Ella, ‡d1878-
245 1 4 ‡aThe effect of time upon variability,
260 ‡aNew York city, ‡bTeachers college, Columbia university, ‡c1926.
300 ‡av, 56 p. ‡bincl. tables. ‡c24 cm.
490 0 ‡aTeachers college, Columbia university. Contribution to education. v no. 216
504 ‡aBibliography: p. 56.
538 ‡aMode of access: Internet.
650 0 ‡aEducational tests and measurements.
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