# Name Parties Matches
Manifesto Project 30 30
Wikipedia 37 37
CHES 12 12
CLEA 21 21
CHISOLS 1 1
DPI 17 17
ESS 17 17
Huber / Inglehart (1995) 13 13
Kitschelt (2013) 6 6
PolCon 8 8
PPMD (2006) 6 6
World Values Survey 34 34
CSES 21 21
EPAC (2018) 14 14
KUREP (2012) 11 11
Mudde (2007) 2 2