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'Difficult to say' is the equivalent of the traditional 'don't know' category and provides respondents with a way to decline to answer as it is unlikely that they would not remember.
This approach allows patients to complete the measure when it is convenient for them to do so, and provides respondents time to think about the questions they are asked.
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This approach provided respondents with opportunity for informed consent and full participation in the study.
However, qualitative (nominally or ordinally scaled) descriptions provide respondents with room for interpretation.
In addition to the screening questions, the survey instrument provided respondents with some basic information on ethanol blends and feedstocks.
Some provide respondents with the option to say that the minimum wage should be reduced or eliminated.
The NBC/SurveyMonkey poll didn't provide respondents with an explicit option to say they were undecided, although they were allowed to skip the question.
This past week, for example, we again provided respondents with a list of characteristics and qualities and asked them to select those that best apply to President Trump.
Specifically, we provided respondents with a scale like the one pictured below, and they could pick a spot on the scale that related to how much blame they wanted to assign to one side or the other.
Two countries provided respondents from industry only (Egypt and Kazakhstan) and 4 countries provided respondents from regulatory agencies only (Kyrgyzstan, Liberia, Mozambique, and Nepal).
We provided respondents with the opportunity to clarify their choices with free text.
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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