1. Pambansang Estadistika ng Pilipinas (PSA) - This is the official full name of the Philippine Statistics Authority, which used to be called the National Statistics Office (NSO).
2. Tanggapan ng Estadistika ng Pambansa (NSO) - This is the literal translation of "National Statistics Office", although it is no longer the official name.
So, it depends on what you want to convey. If you're referring to the current organization, use PSA. If you're talking about the old name, use NSO.