I am running a

**multivariate linear regression analysis**but got stuck with this situation. I have one dependent variable (which is continuous) and

**several independent variables**. Three of them are

**continuous**and three of them are

**dummy variables**(they have values of 1 and 0).

Could you please help me on how should I treat these dummy variables in my analysis? The only thing I am sure about is that I should include only two of my three dummies into the regression (according to k-1 rule). Is this enough? Do I need to do any further steps? Moreover is the omitted dummy variable a "reference variable"?

I use SPSS but also have some basic R knowledge, so I could try the steps in both!

Thank you very much for your help in advance!