How I will prepare business performance questionnaire as a dependent variable? It has two parts a. sales growth b. profitability. To prepare questionnaire I will separate those or together. Business performance is for micro-enterprise.
Based on your question, this will be self-reported data from your survey respondents. If you plan to use a Likert-type scale, I would separate the two elements in the questionnaire--e.g. My sales are growing rapidly 1-strongly disagree, 5-strongly agree; My profits are satisfactory-same scale. If you use multiple measures for each category, then you would want to use confirmatory factor analysis to assure that the items cling together after your analysis. If you are using more concrete measures like percentages for growth and profits, then measures of central tendency apply. I hope this helps.
I would separate the two. But I advise you to review carefully relevant articles in your literature review because using a home-made measure could threat the internal validity of your study. I would use scales those validity and reliability have been assessed and used in top tier reviews. Last but not least, I advise you to randomly order your item in order to avoid some bias. Hope this helps.
Fully agree with Adrien. If you decide towards perceptual measures, try to rely on a well-known and stablished scale and avoid the one-single respondent bias with more than one interview per company. Only as a suggestion I recommend you a quick glance on this three articles with perceptual measures, as they explain quite well what is the source of the items and the methodology they use. However, if possible, try to have also accounting measures for some of the companies in the sample, as a proof to confirm the consistency of your results
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