why use dummy variable in regression when can i use a statistic on a sample to test if an interaction is significant how to find out which variables are included in a linear regression what is the interaction between dummy variables why do we need the coefficients in regression what is the coefficient in a logistic regression what is a coefficient of an experiment what is p value for a linear regression? which variable is used to predict interaction terms between variables? how is a coefficient used in linear regression when to use coefficients in regression what p value is used for linear regression when to use coefficients in linear regression how do you find out if a coefficient is significant why is it necessary to test p value in a linear regression what are coefficients in regression how to use coefficient p how does regression work for an experiment when examining coefficients of dummy variables, how to find the p value what is the coefficient of a linear regression?