Correction Methods
The ideal situation is to somehow avoid this bias from entering a data survey. However, magnitude limited surveys are the simplest to perform, and other methods are difficult to put together, with their own uncertainties involved, and may be impossible for first observations of objects. As such, many different methods exist to attempt to correct the data, removing the bias and allowing the survey to be usable. The methods are presented in order of increasing difficulty, but also increasing accuracy and effectiveness.
Read more about this topic: Malmquist Bias
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—Henry David Thoreau (1817–1862)