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I am reading about degrees of freedom and came across the formula

Degrees of freedom = (number of categories) - 1 - (Number of parameters estimated from the data)

I can not get the "Number of parameters estimated from the data" part. What does it mean?

Bakhtawar
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    Degrees of freedom for what? What kind of model you are talking about? – Tim Oct 01 '16 at 10:14
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    Also, check out the question [How to understand degrees of freedom?](http://stats.stackexchange.com/questions/16921/how-to-understand-degrees-of-freedom) as it may cover what you're interested in. – Silverfish Oct 01 '16 at 10:15

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