I see that there is an option to have SPSS automatically detect various type of outliers.

I get what the following outliers look like:

- Additive
- Level Shift
- Transient
- Seasonal Additive

I think a Local trend outlier indicates a Ramp Shift, that is, the slope of the series changes at a particular point in time. However, I can't figure it out from the computational definition that SPSS provides.

I don't deal with statistics on a daily basis, and would appreciate if anyone could provide or direct me to a plain langauge description of what Innovational, Local trend, and Additive patch outliers are. Example time-series' that show what those outliers look like would be greatly helpful.

Thanks all!