Explanation:

has its members elected according to the system of proportional representation

Who are the Members of Estimates Committee?

Estimates Committee has 30 members. All the members are taken from Lok Sabha (Lower House). That means that there is no representation from Rajya Sabha (Upper House.) (To know the difference between Lok Sabha and Rajya Sabha, check the linked article.) Initially, the committee had 25 members, which was later increased to 30.

Mode of the Election of Estimates Committee’s Members

Lok Sabha elects members of Estimates Committee from amongst its members. The principle of election used is Proportional Representation by the means of a single transferable vote. All parties are duly represented in the estimates committee.