Forum: Statistics

Hi, I have done a pairwise comparison of groups using Dunn's post-test in Prism, following a result of significant differences using a...

Theorem: A stationary AR(1) model can be expressed in terms of MA(infinity). Proof: Now I don't understand how they get from the second last...

When I get the regression equation y = a.x + b by regressing y on x, how do I find and plot the distribution of a?

I am trying to determine the relationship of scores on a test between teachers and their students. I have 40 classes for a total of 40 teachers and...

I have a problem I am trying to figure out. Basically, a gym lists a random sample of the # of times a guest has visited in a 1 month period (12, 19,...

Hi all, I am new to this forum. I have been doing a market survey for a product as a part of MBA thesis where respondents are categorised into 4...

Hi, I have tried to explain the concept of degrees of freedom as I couldnt find a satisfactory explanation of this concept on the internet anywhere....

Hello, I am using one-way Model II ANOVA with the following group sizes: 15, 16, 34, 14, 10 for sample A. Maximum contrast = 34/10 = 3.4. 14,...

Hi, I am a stats newbie. I have to show how 150 variables vary across 13 groups using a graphical representation. Using the usual graphical...

Hello, I am trying to figure out what test to use in order to solve a fairly basic concept. I am not sure if this is a cenvergence test or a...

I am familiar with calculating the intercept, etc for a regression equation, but I am confused as to how to calculate the intercept when using...

Hi all, I'm not sure if anyone else ever worked with data from the British Household Panel Survey (I understand that this is a really specific...

I need to compare the Simpson's Diveristy Index of 2 sites. For each site I have collected beetles using pitfall traps - 20 traps per site. Using...

Sorry to bother you guys but I've been stuck with my stats homework for the past several hours :mad: I'm stuck at the last part of these two problem...

I am having a nightmare and unfortunately my supervisors cannot figure this out either! I have an equation from logistic regression, of which the...

Hi All ... Why is it that the corrected model in an ANCOVA has a different value than the DP for an ANOVA? (I just know that sounds stupid). ...

Is there any statistical tool by which we can generate reports dynamically? I will explain in detail. In case of SPSS, if i did an...

Ok, so please forgive me in advance, I'm not a stats expert, but I do sampling as part of my function as an auditor. I'm trying to develop a new and...

What type of model does not contain an error term and gives an exact relationship between the variables.. Deterministic regression model...

Hi Folks, I have two estimates that I would like to average: N1 = 68.7 (SE = 13.6) N2 = 81.6 (SE = 15.5) Average N = 75.2 (SE = ?). Can...

Hello, I am an accounting student. i only did a unit in statistics covering basic topics such as basic probability, discrete probability...

Hi, I recently did a survey where I had to survey the same people once a week for four weeks. Basically most of my questions involved ordinal...

hi guys, i have a question puzzling me: if x tends to infinity based on some function (where x is a number) , does it imply that the standard...

The course reading isn't too great on this topic, so I was hoping to get some quick help. The question: Suppose 0<P(A)<1 and 0<P(B)<1. If B...

I am reading a book which said the following: This client probably has 100,000 pieces of data in their system at any one time and books 10% of ...

Hi there, I have data for a year for the amount of emissions released from electricity generation. I have time stamps and values. How can find...

HI, I need help in determining whether a survey of subscibers to a specific product is a probability technique or non probability sampling technique....

Hi. I have a problem about sample size determination. The population of interest is somewhat vague. What I know about the population is only...

NVM...I fund what I needed.

Hi, May I happen to know which kind of non-parametric hypothesis tests can compare the horizontal difference between two samples in the pertaining...

An orange juice producer buys all his oranges from a large orange orchard. The amount of juice squeezed from each of these oranges is approximately...

I am new to using R and have just performed some mixed effect models which have significant 2-way and 3-way interactions. My question is now that I...

I am new member and would like to do online business.I am looking to setup an online store and as part of my initial research i need to get some...

I am having trouble choosing what test to compare means. My dependent variable is an interval variable. I have two groups of people, control and...

I have 2 groups of dilutions (titres) that I would like to compare. The thing is, the mean for titres is usually the geometric one so I feel that I...

How do I write an array to .xlsx file. I want to do it in a loop and would like to write it in same sheet.

Hi everyone, I hope you can help me out. I am struggling to determine which is the correct test for the data I have and any help would be greatly...

Hi Everyone, I tried thison the psychology stats forum but never had any takers so thought I'd see if I get an opinion here. I'm postgrad student...

Hey there! I need some ideas about how to analyse data with repeated measurements when there are very many measurements. I have a situation where...

Hi, folks. This is my first foray into posting on this forum, so apologies if there is a protocol I am unaware of. Let's say I have a binomial...

Hi, I'm writing on my thesis and would really appreciate some help. Mostly just telling me if I'm correct or not. So I have a couple of...

Hello, i’m new here and i hope you people can help me with the following. I want to test the validity of a method for estimating the year of...

Dear all, The stats problem I'm having: I want to see whether preferences for certain methods (M) stay the same over time or significantly...

Can anyone help me with this? I'd like to carry out a Tukey test for comparing the mean of 27 samples (and the degree of freedom is 26)....

Social scientist here who is trying to expand into quantitative analysis to complement the qualitative work I do. I've been reading of statistics...

what does the margin of error mean? can it only be used in polls? if not in polls, what does it mean? so i got a margin of error of around 600,...

I have a set of N ratings of an item, where each rating is an integer between 1 and 7 (inclusive). You can imagine a rating of 1 as being a "strong...

I have two arrays X and Y. I get correlation of about 25% but when I regress Y on X I get R-squared of about 8%. What does it mean intuitively...

Hi there all, Need some help with deciding on an appropriate test for my dissertation, which features a rather complex design. A little background:...

My committee advisor is on vacay & didn't leave me with much help. Anyway, first a little background on the thesis. My classmate was instructed to do...

I am trying to determine if there is a statistically significance (p=.05) in passenger enplanements between 2 different airlines at the same airport...

People arrive at a post office an average rate of 50 per hour. What is the probability that the next customer will arrive within 3 minutes? The...

Suppose I have a number N of independent ratings of a given item, where each rating is an integer between 1 and 7 (inclusive). For simplicity sake,...

Hi everyone, Could you please explain to me what the Monte Carlo significance test is? And, is this type useful to and robust to depend on it when...

Theorem: If "θ hat" is an unbiased estimator for θ AND Var(θ hat)->0 as n->∞, then it is a consistent estimator of θ. The textbook proved this...

Hello, My name is Fernando, I'm a biologist and I also have many statistics questions. Hope you can help me. First of all: I'm working with...