Errors in Survey Data All survey data are subject to error; errors can arise from innumerable, often unexpected, sources. Errors can be generated during the planning stage of a survey, more errors can be created during the later stages of data recording and processing. Indeed, we cannot list all the ways in which surveys can go wrong. It is possible, however, to raise our awareness of the problem by focusing on two broad categories of error, random error and systematic error (or bias).
Statistical work cannot be performed in a vacuum. Before all else, such work requires the acquisition of a crucial type of raw material: information relevant to the subject matter under study. Before going with data collection, you must become familiar with a number of crucial concepts that you will employ. Internal vs. External Data Sources … Continue reading Basic Concepts of Data Collection