The Simplified Travel Demand Estimation Method Based on Small Sample Surveys

Web Surveys, Sample Bias and the Travel Cost Method

Environmental economists have long used surveys to gather information about people’s preferences. This is particularly true in the field of non-market valuation, where techniques such as contingent valuation, choice modelling and the travel cost method invariably employ some form of survey instrument. A recent innovation in survey methodology has been the advent of web-based surveys. While popu...

Internet Based Travel Surveys

Median Estimation in Sample Surveys

In a recent paper Maritz and Jarrett (1978) proposed a small-sample estimate of the variance of sample medians from continuous population. In this paper their methods are adapted to median estimation in s~atified sampling without replacement from finite populations. A weighted sample median for estimating the median of heavy-tailed or skewed populations is proposed. Its asymptotic normal distri...

Simplified Variance Estimation for Complex Surveys

Many surveys employ complex sampling and estimation designs. Complex designs lead to complex variance estimation systems requiring significant investments of resources over long time periods to develop, implement, and run. The Census 2000 Accuracy and Coverage Evaluation (A.C.E.) Survey with a complex multi-stage design, imputation, and post-stratified dual-system estimation is an example. The ...

IYCF assessment with small-sample surveys A proposal for a simplified and structured approach

This article describes an approach to assessing infant and young child feeding (IYCF) practices using small-sample surveys which was developed jointly by VALID International; CONCERN Worldwide; Save the Children; the Sierra Leone Ministry of Health and Sanitation; the Niger National Institute of Statistics; the Ethiopian Health and Nutrition Research Institute (EHNRI); the Sudanese Federal Mini...