# All Questions

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### How do you derive the equation (1.69) from (1.68) in "Bishop Pattern Recognition and Machine Learning" page 31

I've been told that I needed to do completing square but I have no idea on how to do it.
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### Spatial Statistics (for mathematicians) lecture notes request

I'm currently doing a master's in mathematics, and I'm interested in spatial statistics, mainly for a project. Unfortunately, it seems impossible to find lecture notes on this topic. I have seen some ...
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### How to control for gender when looking at group differences with a 4-level factor (ANCOVA)?

So I have a dataset with 4 distinct groups, and I am trying to see if there is a difference between these groups on a dependent variable Y which is cardiorespiratory fitness. I did an ANCOVA and added ...
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### The bayes estimator of Bernoulli model with constant prior

I'm currently reading "All of statistics" by Larry A. Wasserman. In the chapter on statistical decision theory, we are given the following example: Consider the Bernoulli model with loss ...
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### Is it better to drop rows with Missing at Random if it's more than 10% of the population?

My goal is to understand when I need to: Mean imputation. Median imputation. Drop the rows. The problem is, I did not have proper statistical knowledge. I just jumped to this industry 8 weeks ago. ...
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### Test if two dependent, unequal size samples are from the same distribution

I read Non-parametric test if two samples are drawn from the same distribution and have tried permutation test, KS test The issue is I have data of different sample size that are collected from the ...
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### exercise autocovariance function

I don't know how to obtain the autocovariance function of the following process, having a multiplication makes it difficult for me. $X_t = Z_t + \theta Z_tZ_{t-1}$ with $Z_i \sim N(0, \sigma^2)$ (...
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### How can I discover similar or resembling sets by a statistical method?

Let say, I have such m datasets: ...
• 649
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### Why is the pooled variance calculated using the variation of the two tested groups?

When comparing between two populations, or two groups from the same population, a t-test assumes that both those groups have the same variance. However, a t-test works by using the pooled variance ...
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### How do I create a table showing my diminishing regression and analyze such a table?

I am currently working on a project for my graduate course on international conflict and peace, and in my project I ran a lagged, diminishing return regression regarding security assistance. My main ...
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### Non-numeric argument to binary operator

I'm trying to find out a model that adequately describes effects of gender and length on food choice. For gender; 0=Male and 1=Female, length; 0=Subadult 1=Adult, Choice; F=Fish I=Invertebrates and O=...
1 vote
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### How to prove that this statistic is not sufficient? [duplicate]

Problem. Given $X_1,X_2,X_3$ a random sample from the Bernoulli distribution with success $\theta$, show that the statistic $T= X_1+2X_2+3X_3$ is not sufficient. My attempt When I try to apply the ...
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1 vote
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### Nested random effect, and converting from R formula syntax to math

I have an experiment where I am looking at species-specific responses to a treatment application. Within each species, I have 3 genotypes, arbitrarily chosen to ensure we aren't detecting genotype-...
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### R wilcox test result conflict

I have gotten R Wilcox test results I do not understand. Comparing two non-Normal independent sets of ~500 ages. The p-value ~.17 but results is "alternative hypothesis: true location shift is ...
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### Testing for significant difference in mortality rate between 3 groups across 3 stages

I am looking for a way to check if there is a significant difference between mortality of egg embryos across three groups (DYF1- double yolk with one embryo; DYF2 - double yolk with two embryos; ...
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### Have Average Stat of Category; Want Likelihood of Category Based on Stat

This is technically a baseball question, but no baseball knowledge is needed. I have a list here of the average OPS (an offensive stat, the range) by position in baseball (the "variable", in ...
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### How to interpret a small regression coefficient with a p-value of 0.01 in an OLS model?

I have built a multiple regression and estimated it using OLS. All the variables are significant. One of the coefficients is close to zero (around 0.0003) with a significant p-value of 0.01. How to ...
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### What is the difference between Linear Regression and Support Vector Regression?

My goal is to understand the advantages of Support Vector Machine. What I have in mind is that Support Vector Machine can have kernel Radial Basis Function ie ...
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### How to conduct an orthogonal transformation? [closed]

Our professor advised us to use OLS even if ardl is fine in estimating the long-run and short-run estimates and identifying if ekc exists in our country. So the problem of multicollinearity exists ...