How to calculate regression model Probit?

Im trying to create a probit model using a Binary independent variable. Basically I am using variables to determine which characteristics influence political party affiliation with the dependent variable being republican or not republican and variables being things like income, sex, education etc.. The only national data I can find are percentages i.e. 43 % men 37% white etc. etc., and in my classes we only dealt with individual observations for example the results of 50 survey participant sample. Is is possible to use the percentages as my variables or would it be better for me to use individual observations and if so where can I find ?|||You cannot do it with percentages alone, unless you have complete breakup, like republcian-white-male-college = x%, republcian-white-male-highschool = y%, republcian-white-female-college = z%, and so on.





So in general you do need the observations, and the data from the surveys might be made available by authors of the surveys.





Try talking to reference person in the library if you have one.


Or use resources like jstor.org or scholar.google.com to find papers that did such surveys, and read them to see if data is publicly available.





If you really like some paper, try e-mailing the authors. They might share the data.