Wednesday, March 21, 2012

In the first of its new series of statistics

Nathan Green

how bias the samples and may bias the researchers draw conclusions

Bang! Bang! Bang! You wake with a start by a knocking at the door. Who can be? You do not expect everybody. You do not have money so it can not be bailiffs, and you have not bought anything on Amazon recently.

earlier this year could have been one of the armies of "respect" agents to enforce the legal obligation for everyone to complete the questionnaire for the 2011 census, the United Kingdom.


repeatedly refused to take part in this exercise once every ten years to face criminal prosecution and a fine of up to 1000 pounds.

Statistically speaking, but we feel about it at the time, this insistence that some 25 million homes in England and Wales involved produces something that is a fascinating rarity. The population data

By having a collection of data around the world, the government can generate statistics for all sorts of things and be sure of its accuracy because these figures do not miss anyone. Unfortunately, in most situations other scientists can not afford to collect data on everyone or everything of interest.

How can you tell us about everything is subject to statistical inference. This should take into account all the characteristics of the sample that is misleading or confusing. Statistical inference is often not easy and there are many challenges to the use of samples can also be difficult to detect.

One thing to consider especially when sampling is through. The bias occurs when there is an imbalance in the sample is not random.

A common type of bias is selection bias, which arises from researchers used the method to choose who or what is included in the sample. The sampling bias makes certain types of people to be more or less likely to include more research, so they are under or over-represented in the analysis.


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