based off of / based on
The preposition after based.
Use based on. Based off and based off of are not the standard forms.
Examples
Use The claim is based on the study.
Avoid The claim is based off of the study.
The preposition after based.
Use based on. Based off and based off of are not the standard forms.
Use The claim is based on the study.
Avoid The claim is based off of the study.