Add a location to your Tweets. When you tweet with a location, Twitter stores that location. You can switch location on/off before each Tweet and always have the option to delete your location history. Learn more.
Cluster sampling examples. Example 1: Assume that a study with relatively large square fixed area plots of 50 m x 50 m had been carried out, on which all tree positions were mapped. Because the individual plots were relatively large, there were only resources available to measure \(n=10\) sample plots.
Types of probability samples. Many strategies can be used to create a probability sample. Each starts with a sampling frame, which can be thought of as a list of all elements in the population of interest (e.g., names of individuals, telephone numbers, house addresses, census tracts).