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Several statistical analyses were applied in the last stages of the pilot tests of constructed items for testing reliability and validity of the questionnaire.
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A measurement scale is composed of a collection of purposely constructed items backed up by empirical evidence of interrelationship and evidence that they represent the underlying construct (Carifio and Perla, 2007).
This entails clarity of the constructed items.
The validity was examined by Nieuwhof within the framework of prototypicality approach, i.e. validation was done by asking peers or expert judges (potential applicants and parents) to assess the prototypicality of the constructed items for motivation.
They tap, scrape and rattle an array of everyday and specially constructed items placed in full view on a long table, including a hand-churned wind machine and mini-gates with clinking locks.
Additional file 1: This table shows a presentation of suggestions for items for constructing items in the final assessment scale.
PROMIS is a collection of carefully constructed item banks that can be used to assess multiple domains of relevance to complex and chronic illnesses.
The FSEP item writing process is presently conducted using a round table audit of each newly constructed item.
In addition, Table 1 shows that the factor loadings of all the research construct items reach statistically significant levels.
The PASES was developed using a scientific approach of defining the construct, item generation, analysis of content of items and item reduction.
Item wording (that is, in favour of/against SDD) was selected as follows: using participants' wording from Round 1 interviews; creating balance (positive and negative statement directions) among items; and reflecting best practice in terms of constructing questionnaire items.
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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