English Name
Time
Details from Source
PSD
Manifesto Project
USD
ParlGov
Wikipedia
CHES
CLEA
V-Party
Wikipedia tags
CHISOLS
DPI
FSND
ESS prtc*
Kitschelt (2013)
PolCon
SoDeUn
PPMD (2006)
WhoGov
World Values Survey
PSDR
CCS
CSES-IMD
Elections Global
EPAC (2018)
EU-NED
Global Elections DB
PDSR
GPD
SoDePa
GPS 2019
Jennings / Wlezien
KUREP (2012)
Leaders Global
Poll of Polls
POPPA
PPMD (all)
Schlager / Weisblatt
PHW 1929
added: Feb. 8, 2019, 6 p.m. — updated: March 12, 2021, 11:16 a.m.