# estimate

1. ### Mixed model LSMEANS vs ESTIMATE (BLUP)

Hello, I am analyzing data from a multi-location trial (5 locations) to test the effectiveness of a treatment with 2 levels. The design is RCB with 3-4 replications in every location. I use the model below: proc mixed data=mydata; class location rep trt ; model Y=trt/ddfm=kr2 residual...
2. ### Maximum likelihood estimation for trajectories prediction

I am currently working on a project where I have to estimate the parameters of an equation in order to estimate next states. More specifically, I have the state space: RHXt= a10+a11* RHZ(t-1)+a12*RHY(t-1)+a13*LHX(t-1)+a(2t)*(RHX(t-1)-RHX(t-2)) + ε. & a(2t)=δ1*a(2t-1)+u(t). Where t is the next...
3. ### In statistical learning, is the learning function a random variable or a constant?

Hi Consider a predictor x and a response Y, where the true relationship between them is given by Y = f(x) + e. e is a random error term. A training data set (x_1, Y_1), ..., (x_n, Y_n) is collected and from this an estimated learning function f_hat is fitted. Then Y_hat = f_hat(x) becomes...
4. ### Likelihood Function

Can anyone help me understand this? Consider the four observations from de Normal Distribution with variance equal to one y1 < 10, y2 > 10, 5 < y3 < 10 and y4 = 10. The likelihood function is? Would be: Replacing: I want to know if this is correct or have another way of solving this...
5. ### Help with effects statements

I am trying to write effects statements and the online materials are difficult to understand. I am working with the below linear regression (proc regress) model in SAS callable SUDAAN and want to determine the beta coefficient for the effect of violence. I would like an overall estimate...
6. ### How to find a median of medians? No raw data

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7. ### RCT: estimation of total sample size knowing only the percentage of occurrence

Dear all, I was asked to estimate the minimum sample size to set up a RCT comparing a standard dose technique to detect recurrence of disease vs low-dose technique. It seemed to be reasonably to me to think about differences in sensitivity and to suggest a noninferiority trial comparing the...
8. ### estimate of measures

Hello everyone, I am a statistics student, I'm studying for a project in my University. I have to analyze the data, I have available the measures in millimeters corrisponding two different types of objects, of course I have already done tests to groups such as t-test, actually these organized...
9. ### estimate a range of measures

Hello everyone, I am a statistics student, I'm studying for a project in my University. I have to analyze the data, I have available the measures in millimeters corrisponding two different types of objects, of course I have already done tests to groups such as t-test, actually these organized...
10. ### Help on interpreting linear regression

Help on interpreting linear regression estimates I'm currently working on a larger assignment, and I need some input how to interpret the results from my/a linear regression. I'm pretty sure I get it right, but as a precautionary measure some input would be lovely. I've websearched and...
11. ### Standard error of estimates

I have the standard error of P (which is an estimator), and W is a constant, and now have the following equation E=W*sqrt(p) to obtain E as the target estimator . How can I calculate the standard error of E?
12. ### the likehood fonction for Log-periodic-power-law ?

can anyone help me to found the the likehood fonction for Log-periodic-power-law ? log(y(t))=A+(B(t-tc)^beta )(1+Ccos(wlog(tc-t)+phi)) A,B,C,beta,phi,tc,w : are parameters to be estimeted. i can't find an exemple to build analogie with this formula .. i was working with Genetic...
13. ### Mean of Current I with Random variable of R

Hi all, I am new to probability and not so good at it, So please bear with me :) If a voltage e is connected across a resistor whose resistance is random variable R, and uniformly distributed between a and b, I needed to find the Mean of current "I" given by "I = e/R" My question...
14. ### Unbiased estimate of cross-product for unbiased vector

Let g be an unbiased estimate of a vector G. Can g be used to find an unbiased estimate of the cross product GG′ (where G' is the transpose of G)? I'm stuck because naively using gg′ is a biased estimator, with the (upwards) bias depending on the noise in g.
15. ### change sign estimate manually because of underlying theory

*****the thread should be: change sign observations variablebecause of underlying theory****** (sorry for the mistakes in the previous version of this post) Dear forum readers, Is someone allowed to put a minus in front of a variable observation, to obtain its contrary, if this is supported by...