Once again, you are in (for me) uncharted territory.
However, I can say that the following list has worked out correctly for Anomalies and UP Issues. And Events too, if you add +100. And after scanning the existing parties, they seem to match up 100%.
So experiment and see what works. And please share your results here. I'll be adding Political Parties to the Writer at some point and your testing will help me out too.
"Economic", 0
"Ship Weapons", 1
"Ship Defense", 2
"Ship Speed", 3
"Morale", 4
"Population Growth", 5
"Social Production", 6
"Military Production", 7
"Research", 8
"Influence", 9
"Trade", 10
"Diplomacy", 11
"Ship Hit Points", 12
"Ship Repair", 13
"Sensors", 14
"Espionage", 15
"Soldiering", 16
"Interest Rates", 17
"Planet Quality", 18
"No Of Trade Routes", 19
"Ship Range", 22
"Luck", 23
"Courage", 24
"Creativity", 25
"Government", 26
"Loyalty", 27
All are percents except for No Of Trade Routes and Speed. Interest Rates affects the leases you are offered when rush buying something. Government reflects how easy it is to win Senate votes (might be good to up this for autocratic governments).
Like I said, I haven't even begun to test any of this stuff out, so proceed with caution and keep back ups!
~SDC~