The function tag has no wiki summary.
1
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0answers
18 views
Requirements for Evaluation function in evolutionary algorithms
For a publication I'm looking for references for generic requirements of evaluation/fitness functions in evolutionary (more specifically genetic) algorithms.
I could come up with some requirements ...
0
votes
0answers
12 views
Pairs Formula function programming in R, upper, middle lower levels [migrated]
I'm having a difficult time programming the pairs function in r, so i can setup upper, middle and lower panels of correlation, histogram and loess respectively. My panel Data looks like this: ...
0
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0answers
40 views
lm to lmer function tweaking
I have stolen and modified a snippet of code found off the internet from (http://www.r-bloggers.com/aic-bic-vs-crossvalidation/) which graphically depicts AIC and BIC values for different polynomial ...
0
votes
1answer
71 views
Can I derive the PDF ( f(C) ) from a spatial function defined as C(x)?
Say I have a random variable (such as concentration) that is defined spatially by some function $C(x)$.
I would like to derive a PDF $(f(C))$ from the concentration function $C(x)$ over some domain ...
0
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0answers
16 views
Covariance of function uncertainty, why (J^T)*S*J? [duplicate]
As I understand it; to get the uncertainty of a function that is based on some measurements, the derivative of this function with respect to this measurment has to be calculated, and multiplied by ...
0
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0answers
35 views
Finding the similarity between two functions
I am a first-year grad student in Computer Science, and I need some help with a problem that I think is statistically oriented. I have taken a statistics course, but it was abysmal and I haven't had ...
0
votes
1answer
65 views
Cumulative function to probability density function
I have some data points for which I would like to show the density using Python, but the package SciPy is not working for Python 3.3.
I am looking for a solution to be able to plot some data in the ...
0
votes
0answers
93 views
R: Generating values for Brownian bridge process for EP bands of Survival function
I'm trying to generate equal-precision (EP) bands for a survival function. Am reading Klein & Moeschberger: Survival Analysis and the original paper from which they quote: Nair 1986
I'm stuck on ...
0
votes
0answers
63 views
Period and curve fitting of ACF in R
I would like to apply some curve fitting to data I have in an ACF plot in R. The ACF plot contains one period of the data and shows a cosine curve (matches extremely well). I would like to find the ...
2
votes
1answer
86 views
R: Defining a new continuous distribution function to use with Kolmogorov-Smirnov Test
I wish to run the Kolmogorov-Smirnov test on my data to determine how well it conforms to a specific continuous distribution function I have in mind.
If my understanding is correct, the ...
-4
votes
1answer
56 views
Gamma function, values of the divisor (c) for unbiased estimation of volatility [closed]
My question comes from this paper, A note on standard deviation and RMS (specifically the table in the upper right hand corner of pg76).
I'm not able to crunch the numbers to generate Spiegel's ...
1
vote
1answer
171 views
calculation of correlation time?
I have two time series of a two realizations of a random process, the process fluctuate around an average so i consider that is a ergodic process. I compute the time correlation function, but i need ...
0
votes
1answer
56 views
Can I represent a non-boolean function with a TREE?
I have a question in respect to tree representation of a non-Boolean function.
Is there any problem in representing a function from
space
Boolean->Limited Integer
or
Limited Integer->Limited ...
1
vote
0answers
73 views
Question related to binomial distribution
Let $X \sim Binomial (n, p)$ with both $n$ and $p$ known.
Suppose for some non-increasing function $G:[0,1] \rightarrow [0,1]$,
and some fixed $c_0 \in [0,1]$,
we have that
\begin{align} ...
9
votes
2answers
200 views
How to estimate the accuracy of an integral?
An extremely common situation in computer graphics is that the colour of some pixel is equal to the integral of some real-valued function. Often the function is too complicated to solve analytically, ...
5
votes
1answer
256 views
Proof that if higher moment exists then lower moment also exists
The $r$-th moment of a random variable $X$ is finite if
$$
\mathbb E(|X^r|)< \infty
$$
I am trying to show that for any positive integer $s<r$, then the
$s$-th moment $\mathbb E[|X^s|]$ is ...
1
vote
0answers
116 views
Objective function in linked prediction models
I would like to use R “optimize” function to estimate the model:
$\hat{Y_{t}}=a\cdot \hat{Y}_{t-1}+b\cdot X_{t}+c\cdot X_{t-1}$
Important thing is that the predition $\hat{Y_{t}}$ (let’s say ...
0
votes
0answers
125 views
Posterior mean of exponential functions: how to do it with MCMC?
I am struggling with estimation of posterior mean of simple exponential function f(x)=exp(x). Mixing of the chain is quite good and there is no problem with estimation of simple mean, but since ...
-2
votes
3answers
132 views
Find a mapping of two probability mass function to another probability mass function
Lets' $p$ and $q$ are probability mass functions of two discrete random variables. I need examples of functions $F(p,q)$ that $r = F(p,q)$ and $r$ is a probability mass function for some random ...
4
votes
1answer
255 views
In spatial regression, what is a spherical autocorrelation structure?
I have a large gridded dataset for the globe (i.e a spherical, wraparound surface) that I'm applying spatial regression to (using a CAR model). I've been using the default autocorrelation function, ...
9
votes
1answer
340 views
Proving a sequence decreases (supported by plotting a large number of pts)
Many of the questions I've posted on SE in the last month have been in the goal of helping me solve this particular problem. The questions have all been answered, but I still can't come up with a ...
2
votes
0answers
104 views
Estimating the x-intercept of an arbitrary monotonically increasing function
I have a continuous monotonically increasing function, $f(x)$, whose $x$-intercept, $x^*$, I am trying to estimate. I have a dataset of $(x_i,y_i)$ pairs, with each $y_i=f(x_i)+\varepsilon_i$, where ...
0
votes
0answers
100 views
What's the difference between $p(x \mid \theta)$ and $p(x; \theta)$? [duplicate]
Possible Duplicate:
Meaning of probability notations $P(z;d,w)$ and $P(z|d,w)$
Can you tell me the difference between $p(x \mid \theta)$ and $p(x; \theta)$?
I know $p(x \mid \theta)$ is ...
1
vote
2answers
123 views
Family of functions ranging from zero to one with parameter influencing rate of approach to one
What is a family of functions which goes from 0 to 1 and has one or more parameters that alters the rate at which a value of 1 is approached?
