This is a preview. Log in through your library . Abstract Changes in forest resources have been estimated in a variety of ways. This paper focuses on extensive forest surveys rather than on ...

Water Environment Research, Vol. 64, No. 7 (Nov. - Dec., 1992), pp. 866-876 (11 pages) Stream sampling for water quality data has commonly employed simple surface-grab procedures as opposed to more ...

The first video in Pew Research Center’s Methods 101 series helps explain random sampling – a concept that lies at the heart of all probability-based survey research – and why it’s important. Fresh ...