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JSTOR is a not-for-profit service that helps scholars, researchers, and students discover, use, and build upon a wide range of content in a trusted digital archive. We use information technology and tools to increase productivity and facilitate new forms of scholarship. For more information about JSTOR, please contact support@jstor.org.. Biometrika Trust is collaborating with JSTOR to digitize, preserve and extend access to Biometrika. SUMMARY A goodness-of-fit test statistic for time series models is presented, and its asymptotic distribution, even when parameters are estimated, is derived. The statistic is a frequency domain analogue of the Box-Pierce portmanteau statistic. The asymptotic power of the test is found and compared to the empirical power of the portmanteau test. The small sample properties are investigated by Monte-Carlo methods.

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This paper is a meta-study of local forest management experiences in developing countries drawn from a review of 56 case-studies presented in 52 papers. Many case-studies report positive links between community forestry and forest conservation. In international organizations and NGOs there is a generally accepted agreement that collective management (community forestry) will yield success in forest conservation. However, the claim is seldom rigorously examined. We suggest to have a review of the literature and to propose a first step to a test of the claim in order to reach a first generalization as to the success of community forestry in forest conservation. The review of the literature is the first step towards such an examination, enabling us to make some initial generalizations for further research. In the present paper, a statistical test is performed and the claim is found wanting. The reviewed papers are very heterogeneous in their approaches, and it is also suggested that the state still has a role to play, even when the transfer of management rights to the forest resources is genuine. Community forestry does not work in a vacuum, and we suggest that a minimum requirement is probably the presence of a legal structure, which exists in India and Nepal but not in many other countries.