English Name
Time
Details from Source
NPD
ParlGov
Wikipedia
CLEA
NaPaDe
EJPR PDY
ESS prtc*
ESS prtv*
Kitschelt (2013)
CSES-IMD
euandi (GPS)
EU-NED
Laver / Hunt
Mackie / Rose (1991)
ADF
MAPP
Poll of Polls
PPMD (all)
TAP
NPPSI
NDPG
EJS 2010
added: March 16, 2015, 4:10 p.m. — updated: March 12, 2021, 11:15 a.m.