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I think im missing smoething.

How I calculate the sample size from this output - ?

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user325753
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    Sample size is your input, not your output. – Misius Jun 16 '21 at 12:06
  • Look up how it's related to the null degree of freedom. – Arnaud Mortier Jun 16 '21 at 12:06
  • @Misius The question is most likely homework. – Arnaud Mortier Jun 16 '21 at 12:07
  • no, its not hw. the hw is to create the model. I did it. I have the excel file and I know there is 89 observations. I just want to know how to calculate it handly – user325753 Jun 16 '21 at 12:08
  • @Misius no, its not hw. the hw is to create the model. I did it. I have the excel file and I know there is 89 observations. I just want to know how to calculate it handly – user325753 Jun 16 '21 at 12:08
  • @ArnaudMortier no, its not hw. the hw is to create the model. I did it. I have the excel file and I know there is 89 observations. I just want to know how to calculate it handly – user325753 Jun 16 '21 at 12:09
  • Do you want to calculate it based only the output without using the input data at all or do you want to know the sample size for further purposes? If the fromer, you need to look up how to connect the sample size to the degrees of freedom and number of coefficients. If the latter, then you already have your sample size. – Misius Jun 16 '21 at 12:12
  • @Misius I come across questions that give me such output and I have to say what the sample size is. So I want to figure out how to calculate it manually without R – user325753 Jun 16 '21 at 12:31
  • Then, as suggested, look up how to connect the sample size to the degrees of freedom and number of coefficients. – Misius Jun 16 '21 at 12:52
  • @Misius what connect? 85 + 4? thats it? – user325753 Jun 16 '21 at 12:58
  • https://stats.stackexchange.com/a/277012/324942 – Misius Jun 16 '21 at 13:00
  • @Misius i get confused – user325753 Jun 16 '21 at 13:12
  • The relationship is in the very first line of the answer that I attached. So in your case, yes, 89 = 85 + 4 – Misius Jun 16 '21 at 13:14
  • @Misius ok, but i see another regression model with 3 coefficients, and 135 degree of freedom and the lecture told us it has 136 observations – user325753 Jun 16 '21 at 14:06
  • Unfrotunately, it is not possible to comment on what your lecturere told you without knowing the context. Degreess of freedom in a simple linear regression is always calculated as the sample size minus the number of parameters to estimate – Misius Jun 16 '21 at 14:31
  • @Misius i told about logistics regression...... – user325753 Jun 16 '21 at 14:57
  • Sorry, my bad, did not notice this. Then the output you have does not say anything about degrees of freedom as such, but for other parameters. You need to read this: https://stats.stackexchange.com/a/113022/324942 (you can find the exact formulae at the very end of the answer). This coincides with what your lecturer told you, however, that contradicts the fact that you said your data has 89 observations. I would recommend you to be much more specific the next time you are posting the question, because it is simply not possible to answer without any kind of context. – Misius Jun 16 '21 at 19:20

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