what is a factor in r what is factor level used in linear regression what is the factor of x2 in r what is the dummy base of the lm function in r r how to use factor how to use factor levels which r factor is dummy which factor can be used as dummy for regression why use factor level as dummy in linear regression which factor is the baseline for linear regression which factor level is the dummy in linear regression what is the lm function for linear regression? lm function choose factor level what is factor and variable which factor level can i set as a baseline in linear regression which factor is the baseline in r function to choose factor level in r what is the basis of a factor in r can factor lm be used in regression which factor is used in r regression