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# Forum: Statistics

Statistics course and homework discussion. Elementary statistics.

1. ### Sticky: Forum Guidelines: Smart posting behavior pays off

Welcome to talkstats.com, the place for statistics help. This is a guideline for people who want to ask a question on this forum and value a...

• Replies: 1
• Views: 197,217
07-16-2014, 11:01 AM
2. ### Sticky: We only provide homework help to those who show effort

Welcome to Talk Stats Forum. In order to keep homework help effective and efficient, we request all members to abide by these guidelines: 1)...

• Replies: 0
• Views: 66,990
09-30-2005, 09:44 AM
1. ### Trying to find the correlation for 2 variable when controlling for 2 other variables

I summed up some of the info we are already provided: N=50 Having job and exam performance--- r= -.3 Having job and and Studying--- r= -.4...

• Replies: 0
• Views: 1,536
09-18-2013, 10:02 AM
2. ### Logistic regression with dummy variables and regular variables

Hello. My logit regression for a sample of 182 has 4 significant explanatory variables. One of these variables is a dummy variable and the rest...

• Replies: 6
• Views: 2,074
09-18-2013, 08:04 AM
3. ### Upper level Stats course kicking my butt.

I am having a lot of trouble in my stats class and can't afford to drop it. I am looking for a way to receive help online so my first problem I need...

• Replies: 15
• Views: 2,663
09-17-2013, 07:59 PM
4. ### question: multiple experimental rounds

Dear all, I have a simple data set that I could analyze with a chi-square contingency test. However, I have repeated the experiment 3 times and...

• Replies: 0
• Views: 1,053
09-17-2013, 12:27 PM
5. ### Violation of Normality in Mixed Design ANOVA

Hi all, I conducted a mixed design ANOVA with two within-subject independent variables and one between-subject independent variable. ...

• Replies: 6
• Views: 5,572
09-17-2013, 06:59 AM
6. ### Newbie - Likert scale repeated mesures analysis

Hi all! I have a user study designed as follows: 3 conditions in different 6 sequences, 30 participants. 8 questions - all in Likert scale. 1...

• Replies: 2
• Views: 2,317
09-17-2013, 01:29 AM
7. ### Do you need formal measure of overdispersion to use negative binomial regression

I have been examining the ucla help site for negative binomial regression. I have a highly skewed dv with many zeroes in it (over a third of the...

• Replies: 2
• Views: 1,669
09-16-2013, 07:31 PM
8. ### P-Value Stats question

A 90% confidence interval estimate for the population proportion (based on the Normal distribution) is (.22, .28). The same 50 sample observations...

• Replies: 1
• Views: 1,888
09-16-2013, 05:42 PM
9. ### Comparing a variable with a control

Hi, I would really appreciate help with regard to the following comparison: Group 1: Number of times an event occurs in the presence of a Factor...

• Replies: 0
• Views: 1,307
09-16-2013, 01:43 PM
10. ### A Prior for Cobb Douglas

I have this equation Q= β0*(L^b1)*(K^b2)*e^u The question is how can I take into account that I have constant returns to scale? All I know is an...

• Replies: 2
• Views: 1,882
09-16-2013, 11:29 AM
11. ### Understanding variance calculations for variables (used in a derivation)

Hello all, I'm taking a stats class that is a bit out of my league and its just assumed that I know how to do this. We're supposed to derive...

• Replies: 2
• Views: 2,183
09-16-2013, 01:27 AM
12. ### Comparing 2 means (binomial distribution type) between 2 groups

Hi, I feel stupid for asking this, but I have a basic "why" question about obtaining the mean values to later run a 2-sample t-test to see if 2...

• Replies: 2
• Views: 4,183
09-15-2013, 05:16 PM
13. ### Neg Binomial Regress:Should the neg binomial dv be transformed prior to analyis

Questions about Neg Binomial Regress: 1) Should the neg binomial dv be transformed prior to analysis to achieve normality or is that the that the...

• Replies: 1
• Views: 1,557
09-15-2013, 11:07 AM
14. ### Comparing population for stability

Hi, I'm trying to extend my research by comparing the population fluctuations in a number of different bird species over a decade. I think the best...

• Replies: 0
• Views: 854
09-15-2013, 06:10 AM
15. ### Comparing two ratios - Which test should I use?

It has been years since I attempted statistics and I would appreciate any form of help. I am looking at data, and I want to see if one rate...

• Replies: 3
• Views: 1,350
09-14-2013, 02:27 PM
16. ### Statistical Data Analysis. Data Mining. Data Manipulation Software Coding.

I have about 10 dozens number of sheets of tabulated historical XYZ events datasheets with columns and rows, where each column also has sub-columns....

• Replies: 1
• Views: 1,130
09-13-2013, 05:44 PM
17. ### Question about Gamma Distribution

Hi everyone, I'm brushing up on my statistics (after a long hiatus) in preparation for some upcoming classes. I'm confused about the parameters...

• Replies: 5
• Views: 3,742
09-13-2013, 03:58 PM
18. ### random effects in mixed models

Hello I am not very familiar with mixed models --- I have been reviewing the various tutorials on the web but still am not sure if/how to specify my...

• Replies: 1
• Views: 1,914
09-13-2013, 12:52 PM
19. ### Interpretting Levene's test (Stata)

I looked this up quite a bit, and found alot about it, but I'm still not entirely sure if I got it right. I just recently got an assignment back with...

• Replies: 5
• Views: 21,591
09-13-2013, 08:24 AM
20. ### Binomial confidence intervals of a count variable multiplied by a continuous one

Hi all, I have a set of Sex Ratio (SR) values computed as: SR=n.males/(n.males+n.females) I test if this observed values might have be found...

• Replies: 0
• Views: 2,078
09-13-2013, 06:24 AM
21. ### Show the two forms of the sample variance are equivalent

Show that the two forms are equivalent: \frac{1}{n-1} \sum_{i=1}^n (Y_i - \bar{Y})^2 = \frac{1}{2n(n-1)}\sum_{i=1}^n \sum_{j=1}^n (Y_i-Y_j)^2 I...

• Replies: 7
• Views: 2,432
09-12-2013, 09:07 PM
22. ### Quick Covariates Question

Hi, I am running a GLM with 2 time points, pre and post testing; however I have a covariate, age. I am wondering if I have run the query...

• Replies: 5
• Views: 1,514
09-12-2013, 06:38 PM
23. ### The avarage age problem

Hi Guys, I’m trying to figure out a good model for modeling the average age of a population. More specifically the average number of years people...

• Replies: 0
• Views: 927
09-12-2013, 02:16 PM
24. ### complex model vs smaller simple models

Hi, I am dealing with a data set that has a number of different variables that can be compared. My approach was to include all of them into a...

• Replies: 0
• Views: 2,379
09-12-2013, 01:01 PM
25. ### Confidence level vs Confidence Interval

I am getting really confused on the confidence level/confidence interval distinction. Most examples I see on the net pair off a 95% confidence...

• Replies: 9
• Views: 4,513
BGM
09-12-2013, 12:59 PM
26. ### Determining when the Data is most stable

Hi I have one variable/parameter fluctuating over time. I need to find that moment in time where the variable/parameter is more or most stable. ...

• Replies: 3
• Views: 2,733
09-12-2013, 11:32 AM
27. ### correct SPSS post-hoc test for my experimental data

Hi, I am currently analyzing the results of an experiment in SPSS. I have tested the effect of 6 light conditions and 2 concentrations of a...

• Replies: 2
• Views: 1,682
Rez
09-12-2013, 07:57 AM
28. ### How to compare monthly sales?

Hi All, I need your help for the following situation. For one company i need to compare sales for the month of March & April to identify which...

• Replies: 2
• Views: 1,236
09-12-2013, 05:26 AM
29. ### Using Random Number Table.

In a random number table , the random numbers are given as first thousand, second thousand, third thousand, and so on. Every thousand has 25 rows...

• Replies: 0
• Views: 2,674
09-11-2013, 07:35 PM
30. ### What is the effect of categorising categorical data as numerical data?

If I'm doing a PCA and I have categorical data as well as numeric but code it all up as numeric what is the issue?

• Replies: 3
• Views: 2,801
09-11-2013, 09:26 AM
31. ### Step by step procedure on how to compute for the Walsh Test (non-parametric)

Hello everyone! I have statistics as one of my subjects and I was assigned to report/discuss about the Walsh Test, a non-parametric test. After...

• Replies: 0
• Views: 1,566
09-11-2013, 06:51 AM
32. ### Game Theory Question: Hawk / Dove Game

If both players act like hawks they fight til the end where the victor will receive a payoff of 20 and the loser will loose 40 points. The chance of...

• Replies: 4
• Views: 3,425
09-11-2013, 03:20 AM
33. ### Estimating average treatment effect

Not sure if this is the right subforum for my question. I have to estimate the average treatment effect of 8 RCT's, performed at 8 different...

• Replies: 0
• Views: 1,598
09-10-2013, 10:58 PM
34. ### Type of ANOVA

Hi, I am getting quite confused knowing if I should run a two-way repeated measures ANOVA or a mixed-design ANOVA. Each participant in my survey...

• Replies: 2
• Views: 1,051
09-10-2013, 05:59 PM

http://tinypic.com/r/28ul6aa/5 ^Above is the question I really am confused on this one since alpha isnt given. Any help is appreciated....

• Replies: 2
• Views: 1,866
09-10-2013, 05:46 PM
36. ### Chi Squared Test (comparing to a normal distribution)

I'm trying to figure out how to go about solving the following problem: A random sample of 64 cities in the US indicates the number of rainy days...

• Replies: 1
• Views: 1,299
09-10-2013, 07:12 AM
37. ### Interpretation of statistical results

Hello at all! I'm writing a thesis about peer effects for my bachelor degree in Germany and i've got some problems with the interpretation of...

• Replies: 3
• Views: 1,822
09-10-2013, 07:02 AM
38. ### Likelihood ratio test on Nonlinear regression done manually. Possible or typo?

Dear all, this forum is great! If I knew about it before, my studies would have been much more enjoyable. Anyways, right now I’m looking at past...

• Replies: 0
• Views: 1,025
09-10-2013, 06:49 AM
39. ### Normality test violations

I have a small sample size (N=26) made up of three groups (n=11, 6 & 9). Whilst running a mixed design ANOVA I have violated both Box's Test of...

• Replies: 2
• Views: 1,245
09-10-2013, 12:41 AM
40. ### Designing a Questionnaire to measure a few constructs of interest

Hi guys! I'm in a beginning level stats class and am having some trouble with an assignment, help is much appreciated. I don't want the assignment...

• Replies: 3
• Views: 1,415
09-10-2013, 12:02 AM
41. ### Impact of high MOE among sub-groups

Hello, I have a question and I'm hoping someone could help me figure out. I will give an example of what I'm coming across, so this is not a...

• Replies: 2
• Views: 1,471
09-09-2013, 03:40 PM

I took a course in Statistics years ago (first year of university), then I studied the book of Rice on my own. After that, I tried to read graduate...

• Replies: 6
• Views: 1,645
09-09-2013, 01:20 PM
43. ### need help with problem

problem with Poisson distribution, please help The number of dirt specks on a randomly selected square yard of polyethylene film of a certain...

• Replies: 0
• Views: 1,440
09-09-2013, 12:16 PM
44. ### estimate a and b parameters.

I watched all of brandons foltz vids on his statistics playlist but for the life of me im stunned and i think due to the technical language barrier...

• Replies: 5
• Views: 1,915
BGM
09-09-2013, 11:57 AM
45. ### non-pooled t-test question?

Hello - I have the following question, which needs to be solved using a non-pooled t test: A sample of size 50 from machine A has a mean of 18.2...

• Replies: 2
• Views: 3,200
09-09-2013, 02:12 AM
46. ### how to calculate interaction effect?

Hello - I'm trying to understand how to calculate interaction effect. The question and answer below the dotted line below are for the following run...

• Replies: 5
• Views: 8,540
09-09-2013, 02:07 AM
47. ### z-scores

Dear Forum, I have a question regarding calculating z-scores. suppose I sample 20 people and ask them to rate on a 7-point scale how satisfied...

• Replies: 3
• Views: 1,989
09-09-2013, 02:01 AM
48. ### Find the 95th percentile of a sampling distribution

I think I've got this, but I just want to confirm: I know that Z^2 follows a Chi-Square distribution with 1 degree of freedom. So to find the...

• Replies: 2
• Views: 4,414
09-08-2013, 10:16 PM
49. ### different conditions - 3 replicates

Hi all! I have a simple problem, but I think the way I'm dealing with it is probably not the best.. So, I have an experiment were I have...

• Replies: 0
• Views: 1,203
09-08-2013, 05:44 PM
50. ### 6 Ways to Address Collinearity in Regression Models

Recently came across this article regarding dealing with Collinearity. Does anyone have an opinion on what is the best method? ...

• Replies: 0
• Views: 795
09-08-2013, 03:36 PM
51. ### No main effect or interaction in 2-way ANOVA

Everywhere I look there seems to be discussions on how to interpret results that show a main effect and no interaction, and vice versa. But, how...

• Replies: 3
• Views: 927
09-08-2013, 02:11 PM
52. ### Beta and Correlation

Hi Guys, I am confused with the following question: " why the correlation of two stocks should have the same sign( positive, negative) as beta...

• Replies: 2
• Views: 1,707
09-08-2013, 11:03 AM
53. ### General Problem - Identifying Trends

This question is very general in nature. I have a practical solution, which isn't very elegant, and having only a little bit of experience with...

• Replies: 1
• Views: 1,101
09-08-2013, 09:29 AM
54. ### Comparing correlation coefficients

Hi:) I am new to the forum nut I hope to find help here :) So here is the situation: I have a dataset with experimental values of Y containing...

• Replies: 3
• Views: 2,075
09-07-2013, 05:06 AM
55. ### probability with x bar r chart

Hello - I need to understand the concept of probability with x bar r charts. I've included a question and answer below the line below. Some things...

• Replies: 6
• Views: 5,993
09-06-2013, 09:36 PM
56. ### I have two treatments to compare to my control - which test should I use?

I have two treatments to compare to my control - which test should I use? I need to see whether there is a difference between either treatment in...

• Replies: 6
• Views: 2,102
09-06-2013, 06:41 PM
57. ### Expected value of a squared random variable

Hi Guys -newbie here. Glad to have found this buzzing community. I'm working on an econometrics course and was looking at the following problem ...

• Replies: 7
• Views: 3,970
09-06-2013, 06:28 PM

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