^ In addition to great responses above, may I recommend that operationalizing racism matters a lot for measuring it. Personally I follow People's Institute for Survival and Beyond's definition - something like: power+prejudice, within an individual (internalized supremacy / inferiority), between individuals (interpersonal bias / prejudice, explicit or implicit, acted on or latent), institutional (laws, policies, etc., formal and informal) and cultural.
So racism is multi-level power plus prejudice at all those levels.
One of my topics of research is racial disparities in police traffic stops, which I could talk more about, but is a specific form of institutional/cultural race discrimination pressure often built on racist structures and attitudes. Some also look at measures like income inequality by race, or power inequalities, like voting turn out or board / governnment representation. Some recent data scientists have looked at explicitly racist google searches (available through google trends work), and mapped that. Others have looked at things like dating websites and questions about interracial dating.
Race-ethnicity is a big construct, and so is racism. Good luck.