Did variables drop out over time Did variables change in definition over time

Did variables drop out over time did variables change

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Did variables drop out over time? Did variables change in definition over time? E.g. number of years of education versus highest degree obtained. Is the information exactly what you need? In some cases, may have to use “proxy variables” – variables that may approximate something you really wanted to measure. Are they reliable? Is there correlation to what you actually want to measure? 06/03/20 28
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Secondary Data – Advantages No need to reinvent the wheel. If someone has already found the data, take advantage of it. It will save you money. Even if you have to pay for access, often it is cheaper in terms of money than collecting your own data. It will save you time. Primary data collection is very time consuming. 06/03/20 29
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Secondary Data – Advantages It may be very accurate. When especially a government agency has collected the data, incredible amounts of time and money went into it. It’s probably highly accurate. It has great exploratory value Exploring research questions and formulating hypothesis to test. 06/03/20 30
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Primary Data - Examples Primary data – data you collect Surveys Focus groups Questionnaires Personal interviews Experiments and observational study 06/03/20 31
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Primary Data - Limitations Do you have the time and money for: Designing your collection instrument? Selecting your population or sample? Pretesting/piloting the instrument to work out sources of bias? Administration of the instrument? Entry/collation of data? Uniqueness May not be able to compare to other populations Researcher error Sample bias Other confounding factors 06/03/20 32
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Data collection choice What you must ask yourself: Will the data answer my research question? To answer that You must first decide what your research question is Then you need to decide what data/variables are needed to scientifically answer the question If that data exist in secondary form, then use them to the extent you can, keeping in mind limitations. But if it does not, and you are able to fund primary collection, then it is the method of choice. 06/03/20 33
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Group Assignment 1 Types of Research Design: Each group should research and write on at least 3 research designs and have 3 members ready to present in class next week. A few groups will be randomly picked to present to the class their assignment. However all assignments will be collected for marking 06/03/20 34
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