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I used qqplot to find that my data is from the t distribution. Then I used the fitdistr function to estimate the parameters of the model for the t distribution and I got a df = 4, scale = 181.28, and location = 10.68. I then want to calculate the probability that X <= -1 using the parameters of the model and my data. How should I approach this?
Try something like
If in doubt, consult
help("pt")