Fix error in burden assoc when using BBeta weights

BBeta weights should not be inverted, otherwise common variants will end
up being weighted higher than rare variants

raremetal/src/Meta.cpp

@@ -3564,9 +3564,11 @@ void Meta::BurdenAssoc(String method, GroupFromAnnotation &group, Vector *&maf,
  weight.Dimension(maf[g].Length());
  SetWeight(method, weight, maf[g]);
  // for burden test, need to 1/w
- for (int w = 0; w < weight.Length(); w++)
- {
+ // if using BBeta weighting, the weights should not be inverted (otherwise, common variants will end up with higher weights)
+ if (method != "BBeta") {
+ for (int w = 0; w < weight.Length(); w++) {
  weight[w] = 1 / weight[w];
+ }
  }
 
  numerator = weight.InnerProduct(stats[g]);