Hello, 

I came up upon an issue in gretl regarding the tramolin package. 

I have tried to run the sample script from the package and I get the following error. The same error appears on all data sets I have tried.  

Thanks you very much!

gretl version 2017d
Current session: 2018-04-03 12:15

? include tramolin.gfn
 C:\Users\rosu000s\AppData\Roaming\gretl\functions\tramolin.gfn
tramolin 1.11, 2017-01-28 (Ignacio Diaz-Emparanza)
? open data9-3.gdt

Read datafile C:\Program Files\gretl\data\data9-3.gdt
periodicity: 4, maxobs: 87
observations range: 1972:2 to 1993:4

Listing 10 variables:
  0) const     1) period    2) reskwh    3) nocust    4) price   
  5) cpi       6) incm      7) cdd       8) hdd       9) pop     

? series price_c = tramolin(price)
Data file is empty
Data error

Error executing script: halting
> series price_c = tramolin(price)