There's also Green Card PERM Salary data available on sites like http://visadoor.com.
H1B's typically have less years of experience compared to Green Card applications, even through both their titles might say Senior Software Engineer for example. If you are researching salaries, I would definitely look into PERM Salaries as well.
Glassdoor groups all the salaries reported for a title over the years in one bucket. Hence, I find the PERM and Labor data very helpful because you can see how salaries have changed over years.
Looking at http://visadoor.com/companies/google-inc for eg. doesn't look all that much different. May be only by ~10K, but that is probably expected between H1B and PERM.
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H1B's typically have less years of experience compared to Green Card applications, even through both their titles might say Senior Software Engineer for example. If you are researching salaries, I would definitely look into PERM Salaries as well.
Glassdoor groups all the salaries reported for a title over the years in one bucket. Hence, I find the PERM and Labor data very helpful because you can see how salaries have changed over years.
Eg. http://visadoor.com/companies/facebook-inc
http://visadoor.com/h1b/index?company=Facebook%2C+Inc.&year=...
http://visadoor.com/greencards/index?company=Facebook%2C+Inc...