Adding a best fit curve to a scatter plot

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I have a scatter plot consisted of 620 points. I want to set the best fit curve rather than me using the "polyfit" function and then use "polyval". In that case I am the one who changes the degree. I also want to show the equation corresponsing to the best fit curve.
When explaining me the procedure, please use some random numbers to X and Y vectors so I can better understand it.
Thanks,
Thishan
  2 Comments
John Doe
John Doe on 4 May 2019
This video below explains this absolutely perfectly.
https://www.youtube.com/watch?v=vh1MLk8rLoI

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