Is it just binary choices?
If so, this will put in Positive if the cell doesn't contain the word negative
=IF(COUNTIF(P2:P2,"*Negative*")=1,"Negative","Positive")
If its just straight up Positive or Negative
=IF(COUNTIF(P2,"Negative")=1,"Negative",IF(COUNTIF(P2,"Positive")=1,"Positive",""))