Tag Archives: statistics

Bad Visualization

Have a look at this graph, which depicts the money raised in awareness campaigns for various health problems, and the number of deaths from the same problems.     Is there something seriously wrong with this graph? There is. I’m … Continue reading

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Sensitive Surveys

In an earlier article, we saw that conducting a survey on a small unbiased sample of the population will give an estimate of the actual quantity we want to measure. For example, if we wish to know how many people … Continue reading

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Employee Attrition Rates

I’ve always wondered how much the employee attrition rates for various companies and industries are. Let’s define the attrition rate for a given year as the proportion of existing employees who quit during the year. My guess was around 5-10%. … Continue reading

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Surveys and Sampling

Surveys are a good mechanism to gather information about people’s opinions and habits. Surveys work on the principle of sampling; if you want an estimate of people’s opinion, you don’t have to ask each one of them; asking a small … Continue reading

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