I am trying to create an IF formula that returs POSITIVE, NEGATIVE, or STABLE
depending on the trend found in a data series. Does anybody know how can I
evaluate a data series for a positive/negative/stable trend? For instance, I
have the following data set:

MONTH January,February,March,April
SALES 100,200,300,100

If I use a chart to analyze this data, I can visually identify it is a
positive trend. Can I get that simple answer using a formula, rather than a
chart?

Thank you!