Korrelation vs. Regression - die klassische Frage

[Sommerwiese]

Hallo zusammen,

ich rechne mich seit Tagen an verschiedenen Regressionsmodellen dusselig, aber bekomme kein Modell mit signifikantem Ergebnis hin...

Insgesamt habe ich 1 x AV, 4 x UV (davon einen Mediator) und potentiell weitere Kontrollvariablen.

In meiner ursprünglichen Korrelationsmatrix sahen die Korrelationen zwischen allen Variablen recht vernünftig aus (was auch aufgrund der Literatur und anderer Studien zu erwarten war), allerdings schaffe ich es in keinem Regressionsmodell (weder über normale lineare Regression, noch Mediatoranalyse) zu einem signifikantem Ergebnis.
Ich habe mittlerweile alle Kombinationsmöglichkeiten aller Variablen, diversen Kontrollvariablen und verschiedene Runden über die "Backwards Elimination" Methode, aber bekomme wenn ich Glück habe, ein R-Quadrat von max. 0.1 (sogar eher kleiner) und bei den Variablen maximal zwei p-Werte die knapp unter oder über 0.05 liegen...

Kann das durchaus sein, dass Variablen hervorragend miteinander korrelieren, die Literatur und andere Studien dies auch noch untermauern, ich aber kein einziges Modell mit signifikantem Ergebnis bekomme?
Oder hat jemand vielleicht noch einen Trick-17 auf Lager oder noch eine andere Idee was ich tun kann?

Vielen Dank und viele Grüße!

[dutchie]

Hallo Sommerweise

Die UVs sind auch untereinader korreliert!

Und man kann die AV nur einmal aufklären!

Isofern ist R nie die summe der "kleinen" r.

Also muss dich das nicht wundern,allerdings
wenn ein r sig. ist sollte auch das multipe R der Regression sig sein,
in der diese UV entalten ist, kann aber auch anders laufen!!!
Dann wird schwierig....

Und man bastelt sich die Regressionsmodell nicht, man hat eins gemäß Hypothese und testet das.

gruß
dutchie

[KervinE]

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