Using Pivot Table to Calculate Slope

[srcera]

Good Day,

I'm trying to create a calculated field in a pivot table that will tell me the slope of my data. For the y-values, I'm using my data and for the x-vales, I've tried both a time value and an automated index, since the times are evenly incremental. With both cases, I get a Divide by Zero error.

Has anyone tried this before or does anyone know why I am getting the error or how to fix it?

My data is normalized, as it has been collected automatically, so I'm pretty sure that is not the issue.

Thanks in advance