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Internal validity was analysed by (i) Completion of questions and missing data: percentage completion by respondents in the surveys was calculated; (ii) Internal agreement within questions: levels of expected response combinations (as percentage) were calculated within each set of questions.
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Those eligible for the study went on to view and rate four ads and complete additional demographic questions (level of educational attainment and parental status).
One of these problems will be served up if the player gets a question level of "Easy".
Other polls, asking similar questions, found levels of gloom that were even more alarming, often at 30- and 40-year highs.
The concept of "nest traits" as opposed to "colony traits" raises interesting questions about levels of selection in this species.
The questionnaire also asked a number of demographic questions and questions about level of experience and area of practice.
So, the old question: "how safe is safe enough?" is reduced to the question: "what levels of risk are acceptable?".
Money-maximizing behavior in the experiment sorts subjects by academic ability, as measured by performance on verbal analogy questions, across two levels of question difficulty.
The question provided levels of confidence (a lot, some, little and none) for each.
To address this question, total levels of CXCL12 present in the bone marrow were quantified by ELISA (Figure 3A).
To answer RQ2, we operationalized the quality of questions using difficulty levels of the questions.
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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