Forum: Statistics

Hi i have a project where i have to collect data and have a statistical analysis of it. I collected weight of patients as my data. The mean for the...

Hi all, I hope that you may be able to help me. I studied the behavior of piping plover chicks and have just finished placing all my raw data...

Hi all, Wasn't sure which group to post this in so admins please move it if its in the wrong place. First time poster. OK so, I'm trying to...

Hey everyone ! I am having a few issues with my assignment. This is question 1, I will make a second thread for question 2. Here is Question 1:...

Hello guys, I did an ANOVA for my data -- 1 dependent variable with 4 independent variables -- but after doing that, I decided to check the...

As the title: I want to check the extraction efficiency of solvent extraction (soxhelt) using different solvents (n-hexane, ethanol, acetone etc)...

Hello! I am a researcher fellow in the chemical engineering area and recently applied experimental design to my experiments. However I am having...

Hi, I have to: Identify the null hypothesis, Ho, the alternative hypothesis H1 and either identify the sampling distribution (normal, t,...

Dear all, I have the following problem. Suppose I have three results of temperature measurements: 10 +/- 2 2 +/- 6 9 +/- 3 Here the +/-...

Hi all, I am doing CFA with 300 sample size. While estimating model i got RMSEA as 0.049 which is very good result, But i am not getting GFI...

UNIANOVA Depression BY Sex /METHOD=SSTYPE(3) /INTERCEPT=INCLUDE /EMMEANS=TABLES(OVERALL) /EMMEANS=TABLES(Sex) /PRINT=HOMOGENEITY ...

Hello everyone. Thanks in advance for your help. I need to analyse the body weight growth curves from two groups of mice. The experimental group is...

Hello everybody, I need to fit the log normal distribution to my data using R. Which is the more accurate taking the log and fit the normal...

Hi all, A simple biologist here and I need some stats help! I've recently done an experiment which (basically) looks at catergoizing cells...

I find myself having to admit that I’m terrible with stats, embarrassingly so, but I need to use them within my thesis. I have absolutely zero...

I have a statistice project on linear programming , desicion optimisation.Using excel solver.Have to find senstivity too.Can you tell me any easy way...

Hello! I hope someone out there can point me in the right direction over a query I have with my stats analysis of a project. I want to compare...

Hello, I was reading a paper and the following line confused me "A 2-factor (5-HTTLPR genotype and sex) analysis of variance revealed no...

Sorry wrong forum, I can't figure out how to delete this thread... :confused:

Can people recommend freely available datasets to download from net to practise with? Ideally, they should include some interpretation (to facilitate...

Hi there. In the multivariate case it is proven that if X~Nm(U, S) and Y = a + CX where C is an invertible n x n matrix, then Y ~ Nm(a +...

Hi all, I've got a question when conducting a path analysis. I've used one sample group and created three different path analysis models (which...

Dear All I am presently completing my dissertation and have used a likert scale type questionnaire.My University statistician has caclulate mean...

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Is it possible for Confidence Interval to have zero width? If yes, how would you interpret?

Hi all, My first stats course was almost 20 years ago. I'm starting again and have come across a calculation for median that I've never seen...

This is a problem given as practice for my exam Y: 3 4 6 8 5 5 9 8 7 5 X1: 1 -1 -1 1 0 0 0 0 0 0 X2: 0 0 0 1 -1 -1 1 0 0 0 X3: 0 0 0 0 0 0 0 1...

Hi I need help with the following: Are offender characteristics related to juror verdicts? Are victim characteristics related to juror verdicts?...

Hi, I want to do fixed effects regression with the time invariant variable of sex, which of course is impossible since fixed effects models can...

I have a research question to be solved: "Georgia wine growers are interested in determining which is the best overall winery in the state. There are...

Hello. When I wanted to solve a exercise (also homework) I figured out that I have a serious problem of understanding a concept. I don’t want you to...

Hi all, I want to specify p,d,q,P,D,Q,s in general SARIMA(p,d,q)\times(P,Q,D)_s models for the following time series x_t. ...

Hi Ive just started learning statistics and came across the hypothesis test. There's this Q in my textbook that says: A random sample of 100...

if i am suppose to go to a retail shop and collect its daily sales data, what conclusion would i be to be able to make? What exactly i have to do (or...

I notice there are many clustering options. I could use some help with determining which one suits my work. I have alot of dealers (dealer codes...

Hi all! Suppose I have two series: x_t=0.3x_{t-1} + w_t y_t=x_t + 0.5w_t where w_t\sim WN(0,1).

Hi and thanks for reading this post, I wanted to know if someone could explain the difference between these two types of plots? Thanks again,...

I am having some trouble understanding what the standard deviation exactly is.. I understand that it explains how wide-spread my data is, but can I...

EDIT: (in title I meant 2 IVs, not 2DVs!) - I fixed it for you - Dason Hi, I have a question: what test would be appropriate? IV = genotype,...

Hi and thank you for reading this post, I ran a factor analysis on a scale and its data, and it came with a "Chi-Square goodness-of-fit" output...

What statistical test should I use for comparing arrival times at a location? I'm comparing two different search strategies.

Hello everybody! I am running a frequency analysis of flood and wind speed, for which the data are assumed to be independent and identically...

I have two groups (Site 1 and Site 2) and would like to look at differences between the sites. The data violates assumptions of homogeneity of...

Hi, I apologise if this is the wrong thread. I need to calculate sample sizes, but I'm curious as to why the commonly used Krejcie-Morgan...

My question is how do I find the values from i) to iv) and the answer are on the bottom but I don't know how to get those answers.

Hello, I have some data from a statewide standardized exam, and I am trying to do a regression model, but am having a bit of trouble. (Im a...

Hi Everyone I am attempting to analyze data that I have collected in the field for my senior thesis. I have been advised to use a Mann Whitney U...

I am working on a project where I need to write Business Requirements for how to take a raw data file, run factor analysis against it and then output...

Hi, just looking for clarification on something in plain English. If I have a probability transition matrix for states 1,2,3,4 given by: ...

I was going over some homework problems, but this one isn't in the back of the book -- I need to figure out what type of hypothesis test to use along...

Can anyone tell me what will the mean-square chi-square statistics i.e. a χ2 statistic divided by its d.f. tends to as the d.f. tends to infinity? ...

I'm trying to find the effect size for an independent samples t-test with unequal groups sizes. n1- 506, X1- 51.45, s1- 9.578 n2- 94, X2- 54.01,...

would the basic graphical way of determining whether a discrete X has a relationship with a discrete Y be an X-Y plot or a scatter plot

Hello, I'm on staff at a pretty big hospital, and I have a lot of data I want to analyze. Specifically, I would like to look at average surgical...