Systematic sampling

In the systematic sampling method, the sampling units are chosen from the sampling frame at a uniform interval at a specified rate. For example, we might use the residential telephone directory. Perhaps the book has 400 pages in it, with an average, after a check of perhaps ten widely dispersed pages, of 400 listings per page, for an estimated total of 160,000 listings (400 x 400). The particular study requires a list of 2000 for sampling purposes. (For simplicity at this point, we forget the number of completions required.) This means that every 80th listing (160,000/2000) should be drawn.

So that the method is a true probability method, where every sampling unit has an equal chance of coming into the sample, there also must be a random starting point. So if we are using every 80th listing, we must select a random starting number of between 1 and 79.

You are Hired

You are Hired

Have You Managed To Land The Job Yet? Are You Fed Up To The Eyeballs And Sick To Death Of Applying For No End Of Jobs And Still Turning Up Empty Handed? Do You Wonder Why Others Are Getting All The Jobs And Not You?

Get My Free Ebook


Post a comment