The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
Félix-Medina and Thompson proposed a variant of link-tracing sampling to estimate the size of a hidden population such as drug users or sexual workers. In their variant a sampling frame of sites where the members of the population tend to gather is constructed. The frame is not assumed to cover the whole population, but only a portion of it. A simple random sample of sites is selected; the people...
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.