Stats increase like this:
+1=x1.5
+2=x2
+3=x2.5
+4=x3
+5=x3.5
+6=x4
You multiply the original stat by the level it was raised. So if an Defense Stat was 100, and Cotton Guard was used, your Defense will be 100x2.5=250.
So, for Dragon Dance, that stat is raised by one. 430x1.5=645 Attack Stat.
Swords Dance raises Attack by 2. 430x2=860 Attack Stat.