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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: 197,032
    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: 66,893
    09-30-2005, 09:44 AM Go to last post
  1. Transforming data (normal distribution)

    If I transform one variable to compensate for skewness/kurtosis, do I have to apply this transformation to all of the other data (i.e. the other...

    Started by cheshirecat‎, 04-16-2009 04:53 AM
    • Replies: 4
    • Views: 8,878
    04-18-2009, 04:23 AM Go to last post
  2. bimodal distribution

    Dear all, My data (expressed in Voice Onset Time, in ms) show a clear bimodal distribution. I've been looking for an answer to the following...

    Started by esimon‎, 05-19-2008 05:15 AM
    • Replies: 4
    • Views: 8,866
    05-20-2008, 05:07 AM Go to last post
  3. Minimum Variance Hedge Ratio

    Hello, Let me provide a quick background of myself. I'm 25, was a math major in college and traded mortgages for the last 3-4 years. I took one...

    Started by CaZeek‎, 12-25-2010 09:47 PM
    • Replies: 2
    • Views: 8,866
    12-26-2010, 12:39 PM Go to last post
  4. Question hypothesis testing by mean levels

    hi everyone... i have this homework.. i tried to solve it... can anyone check if it's right or not, please?? Question: The maximum acceptable...

    Started by abbasilubna‎, 11-10-2010 04:07 AM
    • Replies: 1
    • Views: 8,863
    11-11-2010, 03:42 AM Go to last post
  5. Violation of Homogeneity of variance (MANOVA)

    Hi I was planning to do a MANOVA on a data set I have but have just discovered the data violates assumptions of homogeneity. I was advised to...

    Started by damnsaiyan‎, 07-16-2008 11:48 AM
    • Replies: 2
    • Views: 8,862
    07-28-2010, 07:48 AM Go to last post
  6. Combining Uniform Distributions

    Say I have two variables, X and Y, that both have uniformly distributed probability density functions. I also have a variable Z that is always equal...

    Started by something‎, 10-22-2010 06:29 PM
    • Replies: 5
    • Views: 8,862
    10-23-2010, 03:33 PM Go to last post
  7. Cohen's d for one-sample/paired-samples vs. independent samples, and pooled SDs

    I have a few questions for you all about Cohen's d and pooled SDs! This is my first post, hope it goes in line with forum guidelines. 1)...

    Started by ahafri‎, 06-07-2012 12:46 PM
    cohen's d, effect size, pooled sds
    • Replies: 0
    • Views: 8,862
    06-07-2012, 12:46 PM Go to last post
  8. Method of Distribution Functions

    Hi, I have a question about the method of distribution functions, which is used to derive the density function of some function of a continuous...

    Started by jaskaye‎, 06-25-2010 03:36 PM
    • Replies: 2
    • Views: 8,855
    06-25-2010, 06:32 PM Go to last post
  9. Does it make sense to calculate a standard deviation from only three values?

    I have sets of three values. Does the standard deviation make sense from only three values? Is there a minimum number of values that is recommended...

    Started by tja26‎, 04-27-2006 03:45 AM
    • Replies: 5
    • Views: 8,845
    04-28-2006, 07:36 AM Go to last post
  10. Sample size for ordinal logistic regression (or at least ordinal)

    I am trying to determine the sample size I need for my dissertation and I have no clue where to begin. I have been unable to find a sample size...

    Started by 1kellm‎, 12-13-2013 02:25 PM
    logistic regression, ordinal, power, regression, sample size
    • Replies: 1
    • Views: 8,839
    02-01-2014, 06:00 PM Go to last post
  11. Westinghouse Rules

    What are Westinghouse rules?

    Started by Dude6765‎, 04-16-2009 08:47 AM
    • Replies: 0
    • Views: 8,834
    04-16-2009, 08:47 AM Go to last post
  12. kurtosis skewness and Jarque Bera interpretation

    I am getting a value of 27.202 of kurtosis, Jarque bera of 861.4684 with probability 0.000000 and skewness of 5.078,,,,,,,,,, what to interpret are...

    Started by abi khan‎, 12-06-2011 05:07 AM
    • Replies: 2
    • Views: 8,813
    12-06-2011, 08:58 AM Go to last post
  13. log transformation of binary variables

    Hi everyone, I am trying to do a factor analysis of a group of drinking behavior variables, and some of them are highly positively skewed. I want...

    Started by chaoninja‎, 08-25-2011 12:58 PM
    factor analysis, transformation
    • Replies: 7
    • Views: 8,808
    08-25-2011, 02:39 PM Go to last post
  14. Likert scale - Tiny sample size - What test to use?

    Dear Forum members I am in the progressing of analyzing data from an online Likert scale questionnaire investigating cancer patients experience of...

    Started by suisse11‎, 04-02-2012 12:19 PM
    • Replies: 3
    • Views: 8,807
    04-02-2012, 06:12 PM Go to last post
  15. Question Type I and II, HO and H1

    I am committing to memory the definitions of the Type I and II error rates, but my brain is having difficulty when looking at a null and alternative...

    Started by kerber‎, 09-09-2006 10:02 PM
    • Replies: 2
    • Views: 8,805
    09-10-2006, 08:57 AM Go to last post
  16. Talking it's me again, need some help, thanks

    :D Ok. I think I have it, but my answer does not quite match up. ??? A RECENT POLL OF 700 PPL. WHO WORK INDOORS FOUND THAT 278 OF THEM SMOKE....

    Started by hilarysears77‎, 11-01-2005 07:55 PM
    • Replies: 1
    • Views: 8,797
    11-01-2005, 09:56 PM Go to last post
  17. Kolmogorov-Smirnov Z - how to calculate effect size??

    Hi there, A similar question to Laura's- how do I calculate effect sizes for the Kolmogorov-Smirnov Z? Is the Z value given by SPSS what I need,...

    Started by Arekushia‎, 12-19-2006 07:32 AM
    • Replies: 0
    • Views: 8,793
    12-19-2006, 07:32 AM Go to last post
  18. ANOVA 2 factor with rep - each sample must contain same number of rows

    I am doing a two-factor ANOVA in Excel 2007. However each of my samples do not contain the same number of rows (see attached screenshot) and...

    Started by Layo909‎, 05-13-2011 12:12 AM
    • Replies: 3
    • Views: 8,787
    05-20-2011, 02:25 AM Go to last post
  19. Scheffe Test

    Hi all-- Quick question: Can anyone please give me a VERY elementary definition of a Scheffe post hoc test? Any help will be greatly...

    Started by mgarret‎, 06-01-2011 03:26 PM
    • Replies: 5
    • Views: 8,776
    06-04-2011, 03:34 PM Go to last post
  20. Panel data with entity and time fixed effects

    I wanna regress Y on ENTITY FIXED VARIABLE(say, like alpha i), TIME FIXED VARIABLE(say, theta t), AND three more aggressors Xi, i=1,2,3. Now I...

    Started by iamsevenup‎, 12-06-2008 01:11 AM
    • Replies: 0
    • Views: 8,775
    12-06-2008, 01:11 AM Go to last post
  21. Extremely urgent - Pls help- how to calculate the p value

    I have to calculate a p value, but I am completely ignorant.... Pls help me My data: mean 18 deviation 6 min 12 max 27 sample size 4 I...

    Started by ROURIKA‎, 10-04-2011 06:08 AM
    • Replies: 4
    • Views: 8,775
    10-04-2011, 10:26 AM Go to last post
  22. Which statistical test suits my questionnaire?

    My research involves constraining the English language to a lexicon of fewer words (e.g. by ensuring one-word one-meaning and removing redundant...

    Started by Steve‎, 01-02-2008 02:35 PM
    • Replies: 2
    • Views: 8,762
    01-10-2008, 11:00 AM Go to last post
  23. Standard Deviation with values of zero in population

    Hey, let's say I want to find the standard deviation for a small population, and a lot of the results = zero, is there a way to compensate? For...

    Started by cpaavola‎, 05-30-2011 04:09 PM
    • Replies: 10
    • Views: 8,759
    05-30-2011, 11:23 PM Go to last post
  24. Time demeaned v. LSDV fixed effects regression

    I'd like to figure out which method is better for doing a fixed effects regression: a time demeaned regression (like Stata's xtreg function) or what...

    Started by Jared‎, 11-03-2007 08:28 AM
    • Replies: 0
    • Views: 8,757
    11-03-2007, 08:28 AM Go to last post
  25. How many data rows can SPSS handle?

    In a few weeks an internet survey will hopefully start that should get a response rate of somewhere between 2 and 6 thousand people. I'm assuming the...

    Started by FrankC‎, 05-18-2013 02:16 PM
    spss, sql
    • Replies: 2
    • Views: 8,740
    05-18-2013, 04:06 PM Go to last post
  26. Transforming a Process into a Markov chain

    Can someone please help me understand how this is done: wheter or not it rains today depends on previous weather conditions through the last two...

    Started by knut-o‎, 01-25-2011 04:10 PM
    • Replies: 2
    • Views: 8,732
    01-26-2011, 11:33 AM Go to last post
  27. Significance of Simple Slopes in a 2-way interaction

    I have used simple slopes to test a two-way interaction in a regression model. However, I get 1-tailed and 2-tailes significance results. It is my...

    Started by akkurose‎, 02-14-2011 12:10 PM
    interaction
    • Replies: 7
    • Views: 8,724
    03-11-2011, 02:35 AM Go to last post
  28. Choosing a null hypothesis in general

    I've read for the better part of two to three hours about the null hypothesis. I've run hypothesis tests, DOE analysis, ANOVAs, and the like, and I...

    Started by gtg462y‎, 07-06-2012 11:22 AM
    • Replies: 5
    • Views: 8,724
    07-09-2012, 05:50 AM Go to last post
  29. Help

    I too am having trouble with ANOVA. I have 2 questions that I need assistance with. Question 1: Test the claim that the samples come from...

    Started by 1NAMILL‎, 11-29-2005 03:58 PM
    • Replies: 3
    • Views: 8,718
    11-29-2005, 10:11 PM Go to last post
  30. Geometric mean of normally distributed independent random variables

    Hi all, I have a large set of identical normally distributed random variables, all positive and independent, with the same known Mu and Sigma for...

    Started by ErnoB‎, 02-23-2012 06:08 PM
    • Replies: 5
    • Views: 8,715
    06-24-2013, 06:53 AM Go to last post
  31. Change scores for pre-post design

    Hello One group of participants were measured on 6 items pre- training course. The same group of participants were measured on the same items...

    Started by ljsimkcd‎, 02-22-2011 06:16 AM
    • Replies: 3
    • Views: 8,704
    02-23-2011, 03:10 PM Go to last post
  32. double exponential decay and tau calculation - 2 programs, different answers, no clue

    Hi Background: I am volunteering in a lab doing some calcium imaging experiments. The way similar experiments worked in the past, the lab only...

    Started by mr-kurt‎, 03-09-2010 06:20 PM
    • Replies: 0
    • Views: 8,691
    03-09-2010, 06:20 PM Go to last post
  33. t-score & probability

    Well, I had a question given to me and I cannot find my way to agree with the supposed answer. The question was: If there are 100 participants in...

    Started by willett‎, 10-26-2007 10:40 AM
    • Replies: 0
    • Views: 8,687
    10-26-2007, 10:40 AM Go to last post
  34. Question Kruskal Wallis Test - Minimum Group Size?

    I have 23 subjects, and I want to make comparisons of the distribution of a measurement (with non-normal distribution) across several categories. In...

    Started by Clairept‎, 08-06-2012 06:35 PM
    • Replies: 2
    • Views: 8,669
    08-06-2012, 08:20 PM Go to last post
  35. Question Error in parabolic regression of data points

    I have some data points, each with a specific (but different) error (standard deviation). I fit a parabolic curve to the data points using least...

    Started by strangersface‎, 11-03-2010 02:31 PM
    • Replies: 11
    • Views: 8,663
    11-03-2010, 10:57 PM Go to last post
  36. Unequal sample sizes and statistical tests

    Dear all, I need you help urgently, and I want to thank you all for that. My question is as follows, I have two groups’ j and k and I have two...

    Started by ashu‎, 06-05-2008 12:21 PM
    • Replies: 3
    • Views: 8,660
    06-05-2008, 09:53 PM Go to last post
  37. Poisson or binomial and nCR or nPr

    Hi, How do you tell the difference between: 1) Poisson and binomial distribution, and 2) nCr and nPr? I guess I'm confused between which to...

    Started by joelhuang‎, 11-22-2010 10:49 PM
    • Replies: 1
    • Views: 8,656
    11-23-2010, 06:29 AM Go to last post
  38. Test for relation of 4x4 contingency table

    I have 2 set of data. Each set consists of 2 groups. Each group was binary. (Yes/No or Pass/Fail). The 2 groups of each data can be related somewhat....

    Started by kazumihypono‎, 06-14-2013 02:00 PM
    • Replies: 6
    • Views: 8,653
    06-18-2013, 11:45 AM Go to last post
  39. Statistics Homework Help

    1.) Calculate SS, variance, and standard deviation for the following population of N 7 scores: 8, 1, 4, 3, 5, 3, 4. 2.) A population has a mean...

    Started by tianicole‎, 08-18-2013 04:54 PM
    • Replies: 2
    • Views: 8,653
    08-18-2013, 05:09 PM Go to last post
  40. logistic regression for comparison of two gropus

    Is it okay to use logistic regression to compare a variable between two groups? (as a non-parametric alternative to t-test when its assumptions are...

    Started by Alvarez‎, 03-17-2011 05:31 PM
    • Replies: 7
    • Views: 8,649
    05-21-2011, 01:57 AM Go to last post
  41. Confidence intervals for continuous vs. dichotomous variables: what's the difference?

    Hello, I am performing an analysis and have a variable that is dichotomous (i.e., "0" or "1"). I have another variable that is continuous (i.e.,...

    Started by Wayfarer_Mike‎, 05-30-2011 01:36 PM
    • Replies: 4
    • Views: 8,647
    05-31-2011, 03:56 AM Go to last post
  42. Box Model

    Hey everyone, I need help in creating a box model for a gambling game of dice rolling. So a person pays $7.50 in order to play a game which...

    Started by kanga‎, 12-13-2006 10:50 PM
    • Replies: 1
    • Views: 8,635
    01-11-2010, 02:35 PM Go to last post
  43. P value query and SPSS problem

    Hi all, This is probably a really stupid question, I apologise. If my Independent Samples T test in SPSS returns a P - value (Sig.(2-tailed) of...

    Started by Najet‎, 07-18-2009 09:02 AM
    • Replies: 3
    • Views: 8,634
    07-19-2009, 06:15 AM Go to last post
  44. expected value proof

    x is normally distributed with mean=0 and variance=1. Show E(abs(X))=squrt(2/pi). abs(x)=absolutel value. Since it is normally distributed I...

    Started by interestednew‎, 06-05-2011 06:56 PM
    • Replies: 5
    • Views: 8,614
    06-06-2011, 12:50 AM Go to last post
  45. Two-Sample Interpretation of data

    Ok this one if gonna be a little hard to copy from the book.... Q: A study of the self-concept of seventh-grade students asked if male and...

    Started by mackerbuddy‎, 12-04-2005 04:11 AM
    • Replies: 3
    • Views: 8,599
    12-04-2005, 10:18 PM Go to last post
  46. Hypothesis testing questions

    1). If the hypothesis test is conducted using α = .025, this means that: a. there is a 2.5% chance that the null hypothesis is true b. there is a...

    Started by madden‎, 06-01-2010 08:58 PM
    • Replies: 2
    • Views: 8,582
    06-01-2010, 10:31 PM Go to last post
  47. Beta-Slope?

    Hello, I am working on how to calculate a Beta for a security. I have learnt it in the excel but I dont know why Slope function is used to...

    Started by d.m1085‎, 12-12-2008 02:41 PM
    • Replies: 3
    • Views: 8,581
    06-19-2012, 02:28 AM Go to last post
  48. non normal distribution and regression

    Hi, If the distribution of y variable is not normal. (skewness equal to 1.1 and kurtosis to 8.2) can i run a simple linear regression of the y on...

    Started by 12345678‎, 04-18-2007 10:14 AM
    • Replies: 1
    • Views: 8,580
    04-18-2007, 11:20 AM Go to last post
  49. SPSS help: 1-way repeated measures ANCOVA

    hi, was hoping to find some help with this problem. Trying to set up a repeated measures ANCOVA comparing dependent variable at different times,...

    Started by as123‎, 10-08-2009 12:38 PM
    • Replies: 1
    • Views: 8,579
    10-08-2009, 06:45 PM Go to last post
  50. Fisher's Exact Test

    Hello,:wave: I'm currently a doctoral candidate in wildlife ecology. I'm analyzing habitat selection data for bullsnakes collected over three...

    Started by ReptileJK‎, 05-12-2006 02:35 PM
    • Replies: 8
    • Views: 8,576
    03-26-2014, 07:32 AM Go to last post
  51. Cell count too low for chi-square, too high for Fisher?

    Hi there, Any help with this would be much appreciated! I'm working on comparing two binary data sets that represent the presence or absence of...

    Started by MarineLife45‎, 08-06-2009 07:17 PM
    • Replies: 3
    • Views: 8,572
    08-07-2009, 10:58 AM Go to last post
  52. Percentile Rank problems!

    I can't figure this out and need help ASAP. If the percentage of of a quantitative GRE score of 650 is 93.32, how do I find the GRE score that...

    Started by slayfiel‎, 09-22-2008 07:58 PM
    • Replies: 4
    • Views: 8,558
    09-24-2008, 02:38 AM Go to last post
  53. Multiple choice

    Hello, I have some questions: A researcher wants to determine the mean income of adults in a particular state. She decides to tae a random sample...

    Started by AlexKom‎, 01-12-2006 11:11 PM
    • Replies: 4
    • Views: 8,551
    01-13-2006, 08:47 AM Go to last post
  54. Welch's t test

    Short question; when do I use Welch's t-test? I don't quite get the "unequal variance"-thing. What does it mean that there is unequal variance and in...

    Started by starpen‎, 11-21-2012 12:56 PM
    t-test, welch
    • Replies: 6
    • Views: 8,550
    10-30-2013, 06:19 AM Go to last post
  55. Need help bad. Probability and sample mean

    I have a test on Monday and can not figure out this problem. I'm drawing a blank with what to do. A population has a mean of 300 gallons with a...

    Started by lbinsay91‎, 04-02-2011 08:15 PM
    • Replies: 3
    • Views: 8,543
    04-02-2011, 08:49 PM Go to last post
  56. 99% confidence interval

    I have worked on this problem for awhile trying it different ways - A random sample of 250 students at a university finds that these students take...

    Started by 12canning‎, 04-04-2010 04:50 PM
    • Replies: 1
    • Views: 8,540
    04-13-2010, 10:30 AM Go to last post
  57. Hypothesis Testing

    Need to know the test that will be performed on the following question: The data comprises hours devoted to patient care per week for...

    Started by thedeath‎, 11-04-2006 03:08 AM
    2 Pages
    1 2
    • Replies: 26
    • Views: 8,533
    12-13-2006, 03:39 AM Go to last post
  58. Questions on Type 1 and Type 2 error

    Under hypothesis testing discussion of Type1 and Type 2 errors topic seems to be a bit confusing. Where can i find lot of questions on that topic. I...

    Started by lihinii‎, 09-12-2011 01:28 AM
    • Replies: 7
    • Views: 8,526
    09-14-2011, 03:55 AM Go to last post
  59. Large z-score

    Hi! I have calculated a z-score of 8.759. When I use Table Z there's a note at the bottom that says ' For z >= 3.90, the areas are 1.0000 to four...

    Started by ashleycarfine‎, 10-15-2008 05:24 AM
    • Replies: 2
    • Views: 8,525
    10-15-2008, 11:42 AM Go to last post
  60. Exclamation Case Study Help (statistics) PLEASE HELP

    The Voyage of the St. Andrew Throughout the picturesque valleys of mid-eighteenth-century Germany echoed the song of the Neuländer (newlander)....

    Started by sosme83‎, 04-27-2008 12:16 PM
    • Replies: 0
    • Views: 8,507
    04-27-2008, 12:16 PM Go to last post

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