search for: pblacksquar

...tured there (if it matters I created a new variable in my data frame called pblacksqared and added that to the count portion of the model only). zeroinfl() runs just fine and pblack becomes significant and moves in the appropriate direction once the new variable is added to the model. However, pblacksquared is not significant, and while a coefficient is generated, I get NA values for Std. Error, z value and Pr(>|z|). pblack and pblacksquared are both positive and continuous with no missing values. I can't find anything in the documentation about returning an NA value here. Any suggestions...