Hi every body,

Can you please help me with this confusing issue?

My data is preseted in a scatter plot and the trendline is shown in the figure. The R square value from the trendline option is not the same as the one I got from the Data analysis option from the tools menu (This is an Add-in option). To be sepecific the trend line gave an R square= 0.5465 where the data analysis gave an R square=0.9804509.

Thanks in advance for your help.....