Troubleshooting Newton-Raphson Iteration for Log-Likelihood Problem

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SUMMARY

The discussion centers on troubleshooting a log-likelihood problem using the Newton-Raphson iteration method. The user has derived a formula but encounters discrepancies in results compared to their professor's calculations. Key points include the distinction between the summation index variable 't' and the variable '\tau', as well as the treatment of 'x' as a constant during differentiation. The user seeks clarification on the handling of the term \sum_{t=1}^n \log x! in their derivation.

PREREQUISITES
  • Understanding of Newton-Raphson iteration method
  • Familiarity with log-likelihood functions
  • Knowledge of calculus, specifically differentiation
  • Basic statistics concepts related to likelihood estimation
NEXT STEPS
  • Review the derivation of log-likelihood functions in statistical models
  • Study the application of the Newton-Raphson method in optimization problems
  • Learn about the implications of variable indexing in summations
  • Explore common pitfalls in differentiation of complex functions
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Students in statistics or econometrics, data scientists working on optimization problems, and anyone involved in mathematical modeling using the Newton-Raphson method.

Kinetica
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Homework Statement



Hi guys!
I have solved a log-likelihood problem and its Newton-Raphson Iteration. My step-by-step solution is attached.

The only problem I have is when I plug in numbers, the final number for the first order Newton-Raphson is different from my professor's.

I guess you don't need any numbers. If you can can detect a mistake in my formula derivation, I will really appreciate it.
 

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Just to clarify, the t index variable of the summations is distinct from [itex]\tau[/itex], right? What depends on t? What happened to the term

[tex]\sum_{t=1}^n \log x![/tex]

?
 
Yep! It's different.
I am taking derivative with respect to that t-look-alike.
So I guess you treat x as a number.
But I cannot guarantee it.
Correct me if I am wrong please.

vela said:
Just to clarify, the t index variable of the summations is distinct from [itex]\tau[/itex], right? What depends on t? What happened to the term

[tex]\sum_{t=1}^n \log x![/tex]

?
 

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