The use of a Visual Interactive Simulation (VIS) model for experimental analysis, where the user initiates runs and gathers information as desired without necessarily any respect for formal analysis, is encouraged by some proponents of VIS and VIS software packages. Proponents of formal output...

Trimmed means are means calculated after setting aside zero or more values in each tail of a sample distribution. Here we focus on trimming equal numbers in each tail. Such trimmed means define a family or function with mean and median as extreme members and are attractive as simple and easily...

When establishing an imaging system to support a microscopy laboratory, it is important to seek information from individuals who have knowledge of video, audio and computer equipment. The type of camera system purchased may depend upon the type of microscopy performed in the laboratory....

The time variable is most commonly plotted precisely as recorded in graphs showing change over time. However, if the most interesting part of the graph is very crowded, then transforming the time axis to give that part more space is worth consideration. In this column, I discuss logarithmic...

Does the manner in which results are presented in empirical studies affect perceptions of the predictability of the outcomes? Noting the predominant role of linear regression analysis in empirical economics, we asked 257 academic economists to make probabilistic inferences based on different...

Design plots, as defined in this article, show summaries of a response variable given the classes or distinct levels of numeric or string variables presented as influencing factors. Any summarize results can be plotted using statsby as an engine to produce summaries for groups of observations...

Graphical comparison of results for two or more groups or subsets can be accomplished by way of subdivision, superimposition, or juxtaposition. The choice between superimposition (several groups in one panel) and juxtaposition (several groups in several panels) can require fine discrimination:...

In this article, I review Interpreting and Visualizing Regression Models Using Stata, by Michael Mitchell (2012a [Stata Press]).