Definition: The term "isthmistical" is a term used in statistics and econometrics, which refers to statistical analysis that focuses on using the distribution of data around its mean as an indicator of the strength or direction of change. This approach allows researchers to identify patterns and trends in data without relying solely on descriptive statistics like means and standard deviations. It's important for statisticians to understand how the distribution of data affects their analyses, making it a useful tool in understanding complex relationships between variables.