| # | Name | Parties | Matches |
|---|---|---|---|
| Mudde (2007) | 4 | 4 | |
| Elections Global | 50 | 50 | |
| DPI | 13 | 13 | |
| Laver / Hunt | 9 | 9 | |
| Global Elections DB | 14 | 14 | |
| WhoGov | 5 | 5 | |
| EU-NED | 30 | 30 | |
| PAGED | 24 | 24 | |
| ARPD | 1 | 1 | |
| ParlSpeech | 18 | 18 | |
| Wikipedia | 92 | 92 | |
| PIP | 28 | 28 | |
| Huber / Inglehart (1995) | 8 | 8 | |
| IPOD | 15 | 15 | |
| The PopuList | 11 | 11 | |
| Leaders Global | 13 | 13 | |
| CSES-IMD | 11 | 11 | |
| ESS prtv* | 41 | 41 | |
| Manifesto Project | 40 | 40 | |
| PPMD (all) | 9 | 9 | |
| Ray (1999) | 16 | 16 | |
| GPD | 2 | 2 | |
| EP roll call votes | 20 | 20 | |
| GPS 2019 | 8 | 8 | |
| ESS prtc* | 36 | 36 | |
| TAESD | 7 | 7 | |
| Latinobarometer | 5 | 5 | |
| PPEPE (2021) | 3 | 3 | |
| Kitschelt (2013) | 5 | 5 | |
| POPPA | 11 | 11 | |
| Mackie / Rose (1991) | 59 | 59 | |
| EJPR PDY | 11 | 11 | |
| V-Party | 52 | 52 | |
| EPAC (2018) | 22 | 22 | |
| KUREP (2012) | 12 | 12 | |
| PPDB (2017) | 5 | 5 | |
| euandi (GPS) | 4 | 4 | |
| EES 2014 | 9 | 9 | |
| CLEA | 16 | 16 | |
| PolCon | 17 | 17 | |
| Poll of Polls | 22 | 22 | |
| TAP | 5 | 5 | |
| Jennings / Wlezien | 8 | 8 | |
| NPED | 11 | 11 | |
| ERDDA (2013) | 13 | 13 | |
| PPMD (2006) | 5 | 5 | |
| World Values Survey | 4 | 4 | |
| ParlGov | 43 | 43 | |
| MAPP | 17 | 17 | |
| Wikipedia tags | 83 | 83 | |
| CHISOLS | 31 | 31 | |
| CHES | 26 | 26 |