I would like to ask how I can write the following equations in rstudio.
I think you would use MathJax
Is your question "how do I write these equations as R code?" or "How do I write and render these equations as they appear in the image?"
I want Rstudio code to compute these equations
How much R do you know ?
Can you write a function?
Are you familiar with loops?
Also, do you understand what these equations say to do ? Understanding of the equations will be important if you were to program them in R.
Please explain what the I(y = 0) means.
It means the sum of zeros in the data set
I'll do equations 1 and 2. In equation 2, for some reason this system is omitting some of my asterisks. In equation 3, I don't know what pi_o is.
# given data - I just made up this data y <- c(1,2,0,4,5,0) lambda <- 5 theta <- 2 # preliminary calculations n_o <- length(which(y == 0)) A <- sum(y) n <- length(y) # equations f1 <- -n + lambda + A*log(lambda) - sum(log(factorial(y))) f2 <- n_o + log(pi + (1 - pi)*exp(-theta)) + (n - n_o)*log(1 - pi) - (n - n_o)* theta + A*log(theta) - sum(log(factorial(y)))
Let me add one very small twist to @fcas80's solution. Rather than
lfactorial(y). The reason is that for values of y around 200 or larger, factorial explodes (returns Inf) where lfactorial works okay.
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