Update app.py

app.py

@@ -104,7 +104,7 @@ class RSM_BoxBehnken:
         """
         formula = f'{self.y_name} ~ {self.x1_name} + {self.x2_name} + {self.x3_name} + ' \
                   f'{self.x1_name}_sq + {self.x2_name}_sq + {self.x3_name}_sq + ' \
-                  f'{self.x1_name}_{x2_name} + {self.x1_name}_{x3_name} + {self.x2_name}_{x3_name}'
+                  f'{self.x1_name}_{self.x2_name} + {self.x1_name}_{self.x3_name} + {self.x2_name}_{self.x3_name}'
         self.model = smf.ols(formula, data=self.data).fit()
         print("Modelo Completo:")
         print(self.model.summary())