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Questions tagged [exponential-distribution]

Anything related to the exponential probability distribution, i.e. a continuous probability distribution whose probability density function is a one-sided decreasing exponential function.

Anything related to the exponential probability distribution, i.e. a continuous probability distribution whose probability density function is a one-sided decreasing exponential function:

f(x) = ke-kx    if x >= 0

f(x) = 0          if x < 0

where k is a constant.

See Wikipedia page on the exponential distribution.

Tag usage

Questions on should be about implementation and programming problems, not about the statistical or theoretical properties of the technique. Consider whether your question might be better suited to Cross Validated, the StackExchange site for statistics, machine learning and data analysis.

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Poisson process: exponential inter arrival time VS exponential serivce duration

I know that the inter arrival times in a Possion process is exponentially distributed. So I assume when I use the matlab command as below, the outputs follow the definition. services= poissrnd(20,1,4) %like for 4 time units. t=1,2,3,4 %output is…
knowledge_seeker
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plt.hist function in python is not showing the correct exponential distribution

I am trying to plot the probability distribution function of a simulation that involved the 2-dimensional kinetic distribution. My result should be an exponentially decaying function and I require it to be normalized. To obtain this, I took my list…
Jo Bi
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How to extract the best parameters from ? How to interpret this output?

I'm trying to run a GridSearchCV for find the out the best parameter. Parameter provided as params_space = {'c1': [scipy.stats.expon(scale=0.5)],'c2': [scipy.stats.expon(scale=0.05)]} After executing the grid search, when I print the best_params_…
Jyotibrata Haldar
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How to prove arrival rate follows Exponential Distributions?

I'm studying Anylogic. I'm curious about something. Some people explain that arrival rate follows Exponential Distribution. I wanna know 'How can prove that?' Any kind guidance from you would be very helpful and much appreciated. Thank you so much.
LSY
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Determine waiting times between plane arrivals python

I'm writing a program, that takes 200 planes distributed with the poisson distribution over 12 hours and these planes need to land at an airfield that only has 1 runway. I use the reverse CDF method from the exponential distribution to determine the…
Nikolai
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Log Likelihood in maxLik function

I have a PDF of this where the t I got it from the inverse method. and the x from x<-rnorm(20,0,1). This is model from exponential parallel for survival analysis with covariate where I let lambda= b0+b1*x PDF = 2 * (b0+b1*x) * exp(-(b0+b1*x)*t) *…
zira
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Markov Chain with an Exponential Distribution in Python

I am new to random number generation in Python. I understand the concept of a Markov Chain, but I am unable to convert it into a useful code: Markov Chain - P(X_m+1 = j|X_m = i, X_m-1 = x_m-1,.....,X_0 = i_0) = P(X_m+1 = j |X_m = i) For example how…
Student146
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Exponential models using nls() in R

I have a dataset which resembles the following: time <- c(0, 10, 20, 30, 40, 50, 60, 70 , 80, 90, 100, 110, 120, 130, 140, 150, 160, 170, 180, 190) temp <- c(30, 28, 24, 20, 17, 13, 10, 9, 8, 7.5, 7, 6.5, 6, 5.8, 5.5, 5.3, 5.1, 5, 5, 5) Ts = 5 #…
user12556893
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Exponential distribution to represent crash game

I'm sure many of you have heard of the game called crash. Some popular examples of this are satoshi, bustabit. It's pretty complicated to explain, so I will begin assuming that you are familiar with it. Anyways, my goal is to recreate something…
Peter_Browning
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Generate exponential distribution of event times

I have to generate event times in the time interval [0; T] with T = 2000 s such that the waiting times between consecutive events are exponentially distributed with mean u = 0.4 s. Then counting the number of events per second. I thought I could…
Sheograph
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Python exponential curve fitting in pandas: Define function parameters per row

my dataframe [11 x 300], where the column header equals 'x' ([0.75,1,1.25,1.5,1.75,2,2.25,2.5,2.75,3,3.25]), and each row-value represents 'y' for. Each row can be described by an exponential function in the following format : a * x ^k + b. The goal…
L. Scheipers
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Fitting exponential distribution to frequency table

I have the following data set: intervals <- c("0-10", "10-20", "20-30", "30-40", "40-50", "50-75", "75-100", ">100") int.mean <- c(5.5, 14.3, 24.9, 35.4, 45.2, 63.1, 86.1, NA) freq <- c(165, 90, 55, 25, 20, 35, 30, 15) data <- data.frame(intervals,…
Aesler
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R generating binomial Random variables from exponential random variables

I have 100000 exponential random variables generated withrexp and I am asked to generate 100000 binomial random variables from them using built in R functions. I really don't know how can I generate one random variable from another. I searched some…
amir na
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How can (X|X>Y) change to (X-Y|X>Y)+(Y|X>Y)?

If X~Exp(a), Y~Exp(b), consider (X|X>Y). My book said that (X|X>Y)=(X-Y+Y|X>Y)=(X-Y|X>Y)+(Y|X>Y). But Why?? I don't know why we can divide those two things.
주혜민
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Why is the Scipy instance of expon() returning type:

I am interested why the code below returns an instance type of rv_frozen when expon() is an instance of class expon_gen(rv_continuous) in the stats._continous_distns.py file. Shouldn't it return type:…
Brian Wiley
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