Where Does Data Come From?
Representing Reality: What Makes Good Data • 4m 59s
Data doesn't just appear magically. It comes from somewhere. Data may be created from active methods such as experiments, interviews, or surveys, or passive methods such as observation or archival research. Understanding where data comes from is crucial to using it well.
Up Next in Representing Reality: What Makes Good Data
Sample vs. Population
What's a sample, and why should I care? Knowing whether your data is from a sample or a population helps you understand what questions to ask. Data from samples is easier to get, but it's also potentially biased. So with samples you want to know whether the sampling methods were good--meaning tha...
Choosing a good data construct is the most important part of getting good data. The construct is the thing we choose to measure. Hopefully, a construct is a good match for the thing we want to know. But sometimes it isn't. What makes a good construct?
What's the difference between accuracy and precision? They are not the same, and the difference is important. "Accurate" data gives an impression that closely matches the real thing it is measuring. "Precise" data is measured in a way that gives highly specific measures. For example, if you measu...