To give you a brief background, I'm valuing a fixed-for-float Interest Rate Swap (IRS) using Bloomberg. I put in a notional amount in (USD) and a assigned 6MO USD LIBOR as the reference index for the floating leg. I want to know how Bloomberg computed for the floating rates it used to compute for the floating cash flows and they told me that: 6MO USD LIBOR forward rate is computed using 3MO USD Swap curve then they did a basis adjustment to come up with basis adjusted forward rate. I would like to know how to compute for this basis adjusted forward rate? Thank you.