Adam Hayes, Ph.D., CFA, is a financial writer with 15+ years Wall Street experience as a derivatives trader. Besides his extensive derivative trading expertise, Adam is an expert in economics and ...

The three most common open source technologies for writing data science programs are Python, SciLab, and R. Here's how to write program-defined functions in R. There's no clear definition of the term ...

Local functions enable you to define a function within the scope of another method to help in promoting encapsulation and bring local variables into scope The support for local functions is an ...

Microsoft Excel includes quick stats via Analysis ToolPak; mean, median, and standard deviation are generated for selected ...