why do we need to collect data

If you are collecting self-report data, I believe one of the main reasons forPcollecting data in waves or at different time periods for different constructs is to try and alleviate common method variance (bias). There are a lot of articles on common method variance, but one of the main complaints with getting self report data is that if the survey is long respondents will get fatigued and start putting answers without reading the items.

This lowers the reliability and validity of your data. By spreading it out you might have a better chance of not tiring our the respondent at any one sitting and lessen the effects of fatigue.
Regardless of the field of study or preference for defining data ( or ), accurate data collection is essential to maintaining the integrity of research.

Both the selection of appropriate data collection instruments (existing, modified, or newly developed) and clearly delineated instructions for their correct use reduce the likelihood of occurring.

A formal data collection process is necessary as it ensures that the data gathered are both defined and accurate and that subsequent decisions based on arguments embodied in the findings are valid. The process provides both a baseline from which to measure and in certain cases an indication of what to improve. Tps

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