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Forum: Statistics

Statistics course and homework discussion. Elementary statistics.

  1. Sticky Thread 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...

    Started by TheEcologist‎, 11-27-2010 12:13 PM
    • Replies: 1
    • Views: 197,217
    07-16-2014, 11:01 AM Go to last post
  2. Arrow Sticky Thread 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)...

    Started by quark‎, 09-30-2005 09:44 AM
    • Replies: 0
    • Views: 66,990
    09-30-2005, 09:44 AM Go to last post
  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...

    Started by Lisa3449‎, 09-18-2013 10:02 AM
    calculating correlation, correlation, partial correlation, variables
    • Replies: 0
    • Views: 1,536
    09-18-2013, 10:02 AM Go to last post
  2. Question 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...

    Started by ak1190‎, 05-05-2013 02:50 PM
    dummy variable, logistic regression, mean wtp
    • Replies: 6
    • Views: 2,074
    09-18-2013, 08:04 AM Go to last post
  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...

    Started by FreakBoose‎, 09-16-2013 01:39 PM
    2 Pages
    1 2
    • Replies: 15
    • Views: 2,663
    09-17-2013, 07:59 PM Go to last post
  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...

    Started by hasta‎, 09-17-2013 12:27 PM
    • Replies: 0
    • Views: 1,053
    09-17-2013, 12:27 PM Go to last post
  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. ...

    Started by leh2686‎, 09-15-2013 09:35 PM
    • Replies: 6
    • Views: 5,572
    09-17-2013, 06:59 AM Go to last post
  6. Question 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...

    Started by Torian‎, 09-16-2013 07:20 PM
    • Replies: 2
    • Views: 2,317
    09-17-2013, 01:29 AM Go to last post
  7. Proper method for selecting two-dimensional data of high "agreement"?

    Hello, I have two sets of data which I have plotted against each other. I wish to select the points that have the highest values from both sets...

    Started by AndyPL22‎, 09-16-2013 10:03 PM
    • Replies: 2
    • Views: 1,190
    09-16-2013, 10:13 PM Go to last post
  8. 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...

    Started by buggles001‎, 09-15-2013 03:32 PM
    • Replies: 2
    • Views: 1,669
    09-16-2013, 07:31 PM Go to last post
  9. 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...

    Started by mikey32230‎, 09-16-2013 04:30 PM
    • Replies: 1
    • Views: 1,888
    09-16-2013, 05:42 PM Go to last post
  10. 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...

    Started by ashusethi‎, 09-16-2013 01:43 PM
    • Replies: 0
    • Views: 1,307
    09-16-2013, 01:43 PM Go to last post
  11. 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...

    Started by Axter‎, 09-16-2013 09:35 AM
    a priori, cobb douglas
    • Replies: 2
    • Views: 1,882
    09-16-2013, 11:29 AM Go to last post
  12. 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...

    Started by kdkatz‎, 09-16-2013 01:03 AM
    • Replies: 2
    • Views: 2,183
    09-16-2013, 01:27 AM Go to last post
  13. 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...

    Started by HAV000‎, 09-14-2013 05:06 PM
    binomial distribution, sample mean, t-test
    • Replies: 2
    • Views: 4,183
    09-15-2013, 05:16 PM Go to last post
  14. 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...

    Started by buggles001‎, 09-15-2013 06:22 AM
    • Replies: 1
    • Views: 1,557
    09-15-2013, 11:07 AM Go to last post
  15. 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...

    Started by LizVango‎, 09-15-2013 06:10 AM
    • Replies: 0
    • Views: 854
    09-15-2013, 06:10 AM Go to last post
  16. Using PFA/PCA components in a Neg Binomial Regression: Is this plan justified?

    I am new to stats talk and have found some very helpful information on the site. I have been researching ST, my texts, the spss 22 guide and...

    Started by buggles001‎, 09-15-2013 05:05 AM
    • Replies: 0
    • Views: 1,955
    09-15-2013, 05:05 AM Go to last post
  17. 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...

    Started by Saintjoan‎, 08-31-2013 10:08 PM
    compare, rate, ratio, test
    • Replies: 3
    • Views: 1,350
    09-14-2013, 02:27 PM Go to last post
  18. Red face 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....

    Started by shugar‎, 09-13-2013 04:30 PM
    • Replies: 1
    • Views: 1,130
    09-13-2013, 05:44 PM Go to last post
  19. 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...

    Started by jschroeder5‎, 08-28-2013 09:54 AM
    • Replies: 5
    • Views: 3,742
    09-13-2013, 03:58 PM Go to last post
  20. 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...

    Started by marika‎, 08-30-2013 04:18 PM
    fixed effects, linear mixed models, random effects, spss
    • Replies: 1
    • Views: 1,914
    09-13-2013, 12:52 PM Go to last post
  21. Question 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...

    Started by Lukan27‎, 05-03-2012 03:00 PM
    confidence, interpret, levene, test
    • Replies: 5
    • Views: 21,591
    09-13-2013, 08:24 AM Go to last post
  22. 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...

    Started by simone77‎, 09-13-2013 06:24 AM
    • Replies: 0
    • Views: 2,078
    09-13-2013, 06:24 AM Go to last post
  23. 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...

    Started by APOCooter‎, 09-12-2013 02:23 PM
    • Replies: 7
    • Views: 2,432
    09-12-2013, 09:07 PM Go to last post
  24. 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...

    Started by Razza‎, 09-12-2013 05:02 PM
    • Replies: 5
    • Views: 1,514
    09-12-2013, 06:38 PM Go to last post
  25. The avarage age problem

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

    Started by ludwig‎, 09-12-2013 02:16 PM
    average, joint distribution, poisson process, uniform distribution
    • Replies: 0
    • Views: 927
    09-12-2013, 02:16 PM Go to last post
  26. 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...

    Started by jamie157‎, 09-12-2013 01:01 PM
    • Replies: 0
    • Views: 2,379
    09-12-2013, 01:01 PM Go to last post
  27. 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...

    Started by aferim‎, 09-11-2013 04:53 PM
    • Replies: 9
    • Views: 4,513
    09-12-2013, 12:59 PM Go to last post
  28. 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. ...

    Started by greywolf‎, 09-12-2013 09:56 AM
    • Replies: 3
    • Views: 2,733
    09-12-2013, 11:32 AM Go to last post
  29. 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...

    Started by Rez‎, 09-09-2013 08:40 AM
    • Replies: 2
    • Views: 1,682
    09-12-2013, 07:57 AM Go to last post
  30. 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...

    Started by karthikr44‎, 09-12-2013 02:28 AM
    • Replies: 2
    • Views: 1,236
    09-12-2013, 05:26 AM Go to last post
  31. 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...

    Started by Cynderella‎, 09-11-2013 07:35 PM
    random numbers, random sampling, table
    • Replies: 0
    • Views: 2,674
    09-11-2013, 07:35 PM Go to last post
  32. 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?

    Started by killbot2000‎, 09-11-2013 07:42 AM
    categorical, numeric
    • Replies: 3
    • Views: 2,801
    09-11-2013, 09:26 AM Go to last post
  33. 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...

    Started by jeeldes‎, 09-11-2013 06:51 AM
    • Replies: 0
    • Views: 1,566
    09-11-2013, 06:51 AM Go to last post
  34. 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...

    Started by pickslides‎, 09-09-2013 10:49 PM
    • Replies: 4
    • Views: 3,425
    09-11-2013, 03:20 AM Go to last post
  35. 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...

    Started by Sara85‎, 09-10-2013 10:58 PM
    • Replies: 0
    • Views: 1,598
    09-10-2013, 10:58 PM Go to last post
  36. 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...

    Started by Razza‎, 09-10-2013 05:17 PM
    • Replies: 2
    • Views: 1,051
    09-10-2013, 05:59 PM Go to last post
  37. Simple Statistics question. Please help.

    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....

    Started by mikey32230‎, 09-10-2013 03:43 PM
    • Replies: 2
    • Views: 1,866
    09-10-2013, 05:46 PM Go to last post
  38. Question about ROC analysis

    Hi I'm sorry if this question is obvious to some of you. It's just that I have a test that I would like to analyse using Receiver Operating...

    Started by Flurry‎, 08-25-2013 07:17 PM
    • Replies: 3
    • Views: 1,521
    09-10-2013, 07:55 AM Go to last post
  39. 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...

    Started by ajk1982‎, 08-28-2013 02:27 PM
    • Replies: 1
    • Views: 1,299
    09-10-2013, 07:12 AM Go to last post
  40. 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...

    Started by koenichnico‎, 09-05-2013 10:32 AM
    • Replies: 3
    • Views: 1,822
    09-10-2013, 07:02 AM Go to last post
  41. 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 Iím looking at past...

    Started by marwinbosst‎, 09-10-2013 06:49 AM
    likelihood ratio test, lrt, nls, nonlinear
    • Replies: 0
    • Views: 1,025
    09-10-2013, 06:49 AM Go to last post
  42. 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...

    Started by Razza‎, 09-09-2013 10:18 PM
    box, levenes, normality, normality fix, violate
    • Replies: 2
    • Views: 1,245
    09-10-2013, 12:41 AM Go to last post
  43. 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...

    Started by IzzyUA‎, 09-09-2013 05:09 PM
    likert, questionnaire
    • Replies: 3
    • Views: 1,415
    09-10-2013, 12:02 AM Go to last post
  44. 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...

    Started by bootleggaz‎, 09-09-2013 03:02 PM
    base size, margin of error, moe, sub-group
    • Replies: 2
    • Views: 1,471
    09-09-2013, 03:40 PM Go to last post
  45. Books about Statistics

    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...

    Started by Kiuhnm‎, 09-08-2013 02:45 PM
    • Replies: 6
    • Views: 1,645
    09-09-2013, 01:20 PM Go to last post
  46. 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...

    Started by 4145‎, 09-09-2013 12:16 PM
    • Replies: 0
    • Views: 1,440
    09-09-2013, 12:16 PM Go to last post
  47. 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...

    Started by Aflred‎, 09-08-2013 05:30 AM
    • Replies: 5
    • Views: 1,915
    09-09-2013, 11:57 AM Go to last post
  48. 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...

    Started by random512‎, 09-08-2013 12:34 PM
    • Replies: 2
    • Views: 3,200
    09-09-2013, 02:12 AM Go to last post
  49. 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...

    Started by random512‎, 09-07-2013 12:37 PM
    • Replies: 5
    • Views: 8,540
    09-09-2013, 02:07 AM Go to last post
  50. 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...

    Started by rclukey‎, 09-09-2013 12:21 AM
    normalized score, z-score
    • Replies: 3
    • Views: 1,989
    09-09-2013, 02:01 AM Go to last post
  51. 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...

    Started by APOCooter‎, 09-08-2013 09:57 PM
    • Replies: 2
    • Views: 4,414
    09-08-2013, 10:16 PM Go to last post
  52. 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...

    Started by tiago‎, 09-08-2013 05:44 PM
    • Replies: 0
    • Views: 1,203
    09-08-2013, 05:44 PM Go to last post
  53. 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? ...

    Started by stats4cool‎, 09-08-2013 03:36 PM
    collinearity, regression
    • Replies: 0
    • Views: 795
    09-08-2013, 03:36 PM Go to last post
  54. Question 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...

    Started by StatsScared‎, 08-15-2013 11:39 PM
    • Replies: 3
    • Views: 927
    09-08-2013, 02:11 PM Go to last post
  55. 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...

    Started by Katryna‎, 09-08-2013 03:56 AM
    • Replies: 2
    • Views: 1,707
    09-08-2013, 11:03 AM Go to last post
  56. 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...

    Started by mariolle‎, 09-07-2013 10:41 PM
    • Replies: 1
    • Views: 1,101
    09-08-2013, 09:29 AM Go to last post
  57. 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...

    Started by alchemist_bg‎, 09-03-2013 04:03 PM
    • Replies: 3
    • Views: 2,075
    09-07-2013, 05:06 AM Go to last post
  58. 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...

    Started by random512‎, 09-02-2013 06:10 PM
    • Replies: 6
    • Views: 5,993
    09-06-2013, 09:36 PM Go to last post
  59. 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...

    Started by SarahJones‎, 09-06-2013 04:21 PM
    anova, t-test
    • Replies: 6
    • Views: 2,102
    09-06-2013, 06:41 PM Go to last post
  60. 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 ...

    Started by excelmac‎, 09-05-2013 09:03 PM
    • Replies: 7
    • Views: 3,970
    09-06-2013, 06:28 PM Go to last post

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