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Both individual domains as well as a total score are valid, given accommodation for local dependency.
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A high responsiveness also indicates that a score is valid, which is supported by the high content validity shown by minimal floor and ceiling effects.
GSAS policy is that the TOEFL score be valid at the time of entry into the program (August 2019 for the current admissions cycle). TOEFL scores expire after two years.
・Because most of the items were working for placement purposes, inference from the observation to the observed score was valid.
Thus, because the VELC Test® score was reliable and generalizable with a small amount of measurement error, inference from the observed score to the universe score was valid.
・Because the test score was reliable and generalizable with a small amount of measurement error, inference from the observed score to the universe score was valid.
・Because the test score indicated what test-takers could do with their English, inference from the universe score to the target score was valid.
Depending on when you took the GRE, the GRE score is valid for five years from the date you took the test or for five years following the year in which you tested.
This finding demonstrates that the score is valid and reproducible.
GDS score is valid if the resident could answer ≥ 10 of the 15 questions.
Thus the summed score, for both subscales and the total score is valid, and can be transformed into an interval scale derived from the latent estimate.
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Since I tried Ludwig back in 2017, I have been constantly using it in both editing and translation. Ever since, I suggest it to my translators at ProSciEditing.

Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com