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Book (series)Observations on the geometrical properties of accuracy growth in sampling with finite populations. 1999
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No results found.A common problem in sample-based surveys that are performed under operational constraints is how to scale data collection procedures so as to guarantee an acceptable level of sampling efficiency. This problem constitutes a frequent concern of fishery administrations with limited budget and human resources. Generally, lack of any a priori guidance on sample size requirements tends to increase the size and complexity of field operations and this, in turn, has a direct impact on the logistical aspe cts of data collection and data management procedures. The presented study attempts to provide some answers to the above problem and proposes a supplementary practical tool for use in the design of sample-based fishery surveys. Its major assumptions are that the target populations are finite and of known size and that progressively taken samples are random and independent of each other. Its main feature is the limited use of probabilistic approaches and the adoption of geometrical criteria and t echniques that would be described as "reasonably pessimistic". The method is based on a simple definition of a relative index of proximity of a sample mean to the population mean. This index has several geometrical properties that are only a function of the population size. Using these properties it is possible to formulate geometrical constraints that can be used for predicting a lower limit for accuracy at any sample size between 1 and the population size. -
Book (series)Collecting statistics on agricultural population and employment 1978
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No results found.The dearth of information on rural and agricultural populations and employment was well recognized in the FAO Progra:nme for the 1980 World Census of Agriculture (WCA) where countries were urged to develop this segment of statistics by utilizing the agricultural and population censuses both as means to compile data and as a framework for implementing more frequent surveys within an integrated statistical system. In Resolution No. 14/75 on the Programme for the 1980 WCA, the Eighteenth Session of the FAQ Conference held in Novem• ber 1975, besides urging member nations to carry out their national census of agriculture, requested FAO to ''promote, in consultation with the United Nations and other interested international organizations, the fullest possible compatibility between the results of the agricultural and population censuses, particularly with respect to agricultural population''. This Guide is intended to assist countries in the planning and execution of programmes for the collection of agricultural population and employment statistics which are a major component of the statistics needed for agrarian reform and rural development. It supplements the general guidelines contained in the Programme for the 1980 WCA and presents a comprehen• sive framework of almost all the relevant statistical components characterizing agricultural population and employment and other related fields such as small-scale and part-time farming, locality or community statistics, under•employment, farm typology, the role of women in agriculture, etc. -
No Thumbnail AvailableDocumentFAO/IUFRO meeting on forest genetics 1964An international journal of forestry and forest industries
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