[Gretl-users] Outliers and data labeling in scatter plots

[Marcus Marktanner]

Dear gretl community,

First of all I would like to express my sincere gratitude for the gretl 
project, which I like extremely. I teach a hands-on course in 
econometrics and have just switched from NCSS to gretl. I would like to 
ask two questions though:

1. Is there a way to label observations in a scatter plot by, for 
example, country codes in order to have a visual tool at hand to 
identify outliers?

2. NCSS  has a "Data screening" feature that identifies outliers. I know 
that gretl calculates the Mahalanobis distance, but I have a problem to 
infer from its value on whether a particular observation is an outlier. 
Is there a particular procedure for the identification of outliers in gretl?

As an applied economist, I have not much expertise in programming 
procedures but hope to grow in it as I use gretl more often. Thank you 
very much for your consideration.

Cordially,

Marcus