Often the questions we ask require us to make accurate predictions on how one factor affects an outcome. If a teacher is asked to work out how time spent writing an essay affects essay grades, it’s ...

Quick take: At the end of March the S&P 500 index price was 56% above its long-term trend, up from 53% above trend the previous month (a downward adjustment from 54%). About the only certainty in the ...

The first step in running regression analysis in Excel is to double-check that the free plugin Data Analysis ToolPak is installed. This plugin makes calculating a range of statistics very easy. It is ...