poisson

So my basic query is just because you've binned and counted the data into a histogram are the error bars on the bins necessarily the Poisson sqrt(N)? Longer explanation: I have an image of pixel values which represent brightness values. Im binning them into a histogram to get the PDF of the...

Hey Guys I've been racking my brain for ages trying to solve this but I can't seem to get the last step. The question is, given 0<u<t , 0<=k<=n Show that P(X(u) = t | X(t) = u) = (n choose k) (u/t)^k (1-(u/t))^(n-k) I have started by using the law of total probability in that P(A|B) =...

How can you test the whether a collection of rate data is consistent with a Poisson process? I am investigating a random process which conceptually could be a Poisson process. I have a collection of rate data (counts/min), and I would like to test whether their distribution is consistent with...

The number of pacients that get into the hospital is 36 per day. Wich is the probability that in one hour 4 pacients get in.

Dear all I am working with a Gamma-Poisson mixture distribution where (and this is not usual) the support of the Gamma distribution (in fact, I am able to restrict to the neg exponential instead of the Gamma...) is finite, e.g. [0,1]. I would like to derive the mean and a Likelihood...

Hello! I am new to this forum. I am bombarded by a lot of info on count DVs. Here are my variables: a. DV= firm-year observations. 7 years, 101 firms. I recorded the number of actions of a firm per year. The resulting measure is a Herfindhal-type of index since I measured the proportion of...

Dear all, I have recently been given a piece of SPSS-based coursework, and with the deadline coming into view I am stuck on the data entry section. I have been given two tables of data: Table 1 presents the number of cases of insulin-dependent diabetes mellitus (IDDM) by sex, age and...

This probably has an easy solution, but I was wondering if anybody could help me solve and explain these two questions: (a) Show that the expectation of the random variable is E(X) = lambda (b) Show that the variance of the random variable is Var(X) = lambda Any help would be very...

The number of cracks in a section of interstate highway that are significant enough to require repair is assumed to follow a Poisson distribution with a mean of two cracks per mile. What is the probability that there are no cracks that require repair in 5 miles of highway? any help guys? :)

The number of cracks in a section of interstate highway that are significant enough to require repair is assumed to follow a Poisson distribution with a mean of two cracks per mile. What is the probability that there are no cracks that require repair in 5 miles of highway? any help guys? :yup:

I have two different Poisson models: Y = b1 + b2*X (1) Y = b1 + b3*X + b4*C (2) I would like to compare whether b2 is different than b3? The model is a poisson regression, is there a quick way to do it in SPSS? Many thanks Ezgi

Hello, I am currently doing some bus stop designs. I have not done statistics for a while but remember once doing poisson distributions at Uni. The problem I have, I think, requires a specific arrangement of the poisson formula for cumulative distribution. If I have x number of buses...

Hello, My independent data are continuous variables. My dependent variable is count data. I want to use regression to look for a relationship. Generally speaking, what is/are appropriate regression(s) for this situation? Thank you kindly, Mike

I have an equation with linear combination of exponential distributions, i.e. sum (c_i * exp(a_i)) on the right hand side, and on the left hand side I have something that is best fitted by cauchy or log-normal... Now, I am looking for an estimating function for a linear combination of...

Please ignore question no longer need help - thank you for all of your responses!

What is the probability there are at least 24 accidents at the intersection in a year if the mean number of accidents per month is 2.2? (answer=0.693) I keep getting 0.706, which is close to the listed answer, but I'm not sure if it is correct. My attempt: P(X≥24) = P(X>24)+P(X=24) =...