I´m trying to find by hand the se.fit. I have 30 different values of the Y real and the Estimate Y. How can I calculate it? Thank you!
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$\begingroup$ Welcome to CV, Martina. Could you be more specific about what "the se.fit" might be? It sounds like you might mean one of the (many) standard errors associated with some form of regression, but what form and which standard error? Also, are you aware you can search our site for answers? I find many formulas for ordinary least squares regression, for instance, by searching least squares formula standard error. Also, please try to apply more appropriate tags: this is not a question about mathematical statistics. $\endgroup$– whuber ♦Commented Apr 11, 2023 at 19:28
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$\begingroup$ Thanh you for your answer! I´m talking about the standard error for individual linear regression predictions. I've been looking on your website for answers but I couldn't find the right one. $\endgroup$– Martina BazCommented Apr 11, 2023 at 19:43
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$\begingroup$ I added "prediction" to the search terms and found answers: see the duplicate. You can also find the formula quoted in an image in the question at stats.stackexchange.com/questions/187601 and in the thread at stats.stackexchange.com/questions/560077. $\endgroup$– whuber ♦Commented Apr 11, 2023 at 19:48
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$\begingroup$ Thank you very much! $\endgroup$– Martina BazCommented Apr 11, 2023 at 21:23
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