LIGO Document T1500597v1
 Measuring the properties of a gravitationalwave signal is a question of parameter estimation. The end result of these studies is a set of samples drawn from the posterior probability distribution. The posterior contains all the information that we have, but may not be easily digestible; in many cases, it is desirable to quote summary statistics to concisely describe findings. In most practical cases, it is impossible to compress a complete description of a distribution down to a single number; therefore, any point estimate could miss key pieces of information. Here, we discuss various possibilities for summary statistics. We also include a discussion of how to quote systematic errors on parameter estimates. While there is no perfect answer, our suggestion is to use \( X^{+Y}_{Z} \), where \( X \) is the median \( Y \) and \( Z \) are estimates for the statistical error (measurement precision) from the bounds of a symmetric credible interval, and then add in estimates for systematic error from the range of \( X \), \( Y \) and \( Z \), which could be presented as \( X^{+Y\pm y}_{Z\pm z} \) or \( (X\pm x)^{+Y\pm y}_{Z\pm z} \).

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