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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: 197,070
    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: 66,910
    09-30-2005, 09:44 AM Go to last post
  1. Heteroskedastic robust standard errors VS. regular

    Is it ever wrong to use heteroskedastic robust standard errors? What happens if the data is in fact homskedastic? Thanks in advance, Richard

    Started by RToss‎, 12-08-2011 09:07 AM
    • Replies: 1
    • Views: 2,582
    12-08-2011, 09:34 AM Go to last post
  2. Quick help understanding a likely easy question

    Hello, I was wondering if someone could help me intrepet these regression results. I am looking at an economics paper regarding racial bias in the...

    Started by mikeswanson‎, 12-07-2011 12:48 AM
    • Replies: 7
    • Views: 1,882
    12-08-2011, 04:35 AM Go to last post
  3. Life Data Analysis

    Good Morning, This is the first time that I have posted anything and I am really in need of guidance. I am trying to figure out the best way...

    Started by gaskinwb‎, 07-29-2011 07:52 AM
    reliability, weibull
    • Replies: 4
    • Views: 2,505
    12-08-2011, 04:19 AM Go to last post
  4. Someone who can help me with EasyFit (Statistical Software)

    Hello! As part of a project I am fitting many probability density distributions .... I am doing all it on excel (making each equation), but I am...

    Started by af_231‎, 12-08-2011 03:01 AM
    • Replies: 1
    • Views: 2,219
    12-08-2011, 04:02 AM Go to last post
  5. How to analyse 5 point Likert scale questionnaire??

    Dear all, I have to analyse a 5 point Likert scale questionnaire (I have just one 10 point scale question). I was thinking in make correlations,...

    Started by Denisse‎, 12-07-2011 11:48 AM
    5 point scale, correlation, likert scale, questionnaire, spss
    • Replies: 3
    • Views: 6,395
    12-08-2011, 02:20 AM Go to last post
  6. HELP with determining Confidence Intervals for population estimate!!

    Hi, I'm doing a research report on fish populations through time using mark-recapture methodology. I've estimated the overall population...

    Started by esso62‎, 12-08-2011 12:36 AM
    • Replies: 0
    • Views: 3,051
    12-08-2011, 12:36 AM Go to last post
  7. Nonparametric vs Parametric Correlations?

    I ran a variety of tests and they all say my data is non-normal. I ran nonparametric tests (okay, just the Mann-Whitney) but now I wanted to look at...

    Started by statn00b‎, 12-07-2011 12:08 PM
    • Replies: 8
    • Views: 3,049
    12-07-2011, 09:49 PM Go to last post
  8. T-value meaning?

    I have done a paired t-test in the minitab and got the t-value = -4.78 and p-value = 0.001 My Null Hypothesis: The drug is not effective therefore...

    Started by vanklik‎, 12-07-2011 03:45 PM
    • Replies: 3
    • Views: 20,587
    12-07-2011, 08:18 PM Go to last post
  9. ANOVA Simple effects help

    When finding a significant interaction effect in a factorial ANOVA and then doing a simple effects of all of your comparisons, do you need to divide...

    Started by statss‎, 12-07-2011 05:11 PM
    • Replies: 4
    • Views: 2,580
    12-07-2011, 05:34 PM Go to last post
  10. A regular EOQ model is appropriate when demand is seasonal.

    A regular EOQ model is appropriate when demand is seasonal. a. True b. False

    Started by micheal‎, 12-06-2011 03:45 PM
    • Replies: 4
    • Views: 4,280
    12-07-2011, 11:01 AM Go to last post
  11. Which of the following methods could be used to determine future order quantities?

    Which of the following methods could be used to determine future order quantities? a. forecasting b. regression c. inventory models d. all of...

    Started by micheal‎, 12-06-2011 03:42 PM
    • Replies: 2
    • Views: 3,512
    12-07-2011, 10:58 AM Go to last post
  12. If demand is normally distributed,

    If demand is normally distributed, a. a basic EOQ is appropriate. b. a single-period model could not be appropriate. c. we should produce to...

    Started by micheal‎, 12-06-2011 03:43 PM
    • Replies: 2
    • Views: 3,350
    12-07-2011, 10:57 AM Go to last post
  13. How much skew is too much?

    Hello, I am trying to do a linear regression, with a Response Time as my DV with R. When I run a gvlma with the model, the skewness always comes...

    Started by Keira Hillary‎, 12-07-2011 10:34 AM
    regression, skew
    • Replies: 0
    • Views: 3,376
    12-07-2011, 10:34 AM Go to last post
  14. Lightbulb Hypothesis testing nominal data

    Hi all Just found this great website but unfortunately i cannot find a thread that can help me so here is my question. i got an assignment where...

    Started by Christian Vogelius‎, 12-07-2011 04:43 AM
    • Replies: 3
    • Views: 4,102
    12-07-2011, 06:07 AM Go to last post
  15. I'm stuck - I'm not sure what stats test to use for discrete data

    Thanks for looking! I'm doing a project looking at whether age affects the likelihood of someone breaking their post-operative instructions. Its...

    Started by Heather Coventry‎, 12-07-2011 04:58 AM
    • Replies: 1
    • Views: 1,144
    12-07-2011, 06:01 AM Go to last post
  16. Recommendation on Statistical Software

    Hello everybody! Today I am asking your recommendation on statistical software. As part of a project I have to fit many distributions in order to...

    Started by af_231‎, 12-07-2011 04:55 AM
    • Replies: 0
    • Views: 1,533
    12-07-2011, 04:55 AM Go to last post
  17. [Paired T-Test] Assumptions & Violations

    poor design methods

    Started by jimbrowsky‎, 12-06-2011 01:11 AM
    assumptions, confidence interval, correlation, paired t-test, t-test
    • Replies: 5
    • Views: 4,878
    12-07-2011, 02:50 AM Go to last post
  18. [Post Hoc Tukey Repeated-Measures T-Test] Interpreting results & Confidence intervals

    This has been solved using SPSS

    Started by jimbrowsky‎, 12-07-2011 02:06 AM
    apa, confidence intervals, post hoc test, t-test, tukey
    • Replies: 0
    • Views: 1,518
    12-07-2011, 02:06 AM Go to last post
  19. Orthogonal Contrasts

    What are orthogonal contrasts?

    Started by statss‎, 12-06-2011 09:48 PM
    a priori, anova, posthoc
    • Replies: 8
    • Views: 3,190
    12-06-2011, 11:54 PM Go to last post
  20. Likelihood Ratio Test for Normal Distribution

    Suppose that X_{1} .. X_{n} are iid N(0,\theta). Prove that the Likelihood Ratio test of H_{0}: \theta = \theta_{0} vs H_{1}: \theta = \theta_{1}...

    Started by MrAnon9‎, 12-06-2011 09:23 AM
    • Replies: 4
    • Views: 4,150
    12-06-2011, 11:34 PM Go to last post
  21. interpreting a correlation plot (time series)

    Hi, I've been asked to suggest a time series model based on the following correlation function, I was just wondering what you would suggest, ACF...

    Started by mathy1991‎, 12-06-2011 07:27 AM
    autocorrelation, autocorrelation function, correlation, time lag, time series
    • Replies: 1
    • Views: 1,790
    12-06-2011, 11:11 PM Go to last post
  22. help with determining variance component of repeated measure

    Was wondering if anyone could help me out with figuring out how to determine percentage of variance for random factors part of a repeated measures...

    Started by blue‎, 12-06-2011 10:36 PM
    • Replies: 0
    • Views: 1,604
    12-06-2011, 10:36 PM Go to last post
  23. Help!!!!!!! Comparing Two Distribution - Kolmogorov-Smirnov

    Hello, I am comparing two distributions by using the Kolmogorov-Smirnov method, but I want to know how different is one distribution to the other?...

    Started by Shamvir‎, 11-26-2011 11:18 PM
    2 Pages
    1 2
    • Replies: 17
    • Views: 10,844
    12-06-2011, 05:09 PM Go to last post
  24. Please help with formulas. Presentation in two hours

    I don't know what formulas to use The Berkley Gift Shop wants to have their own credit card with the “Berkley GS” logo, the Manager, Mr. Tyler...

    Started by miushja‎, 12-06-2011 12:18 PM
    • Replies: 9
    • Views: 3,012
    12-06-2011, 02:04 PM Go to last post
  25. Can chi-squared be used on count data with zero counts? If not, alternatives?

    Hello I'm looking for a non-parametric test that works on count data with a few zero counts. Example data set: Cow pat 1: 137 (no ....

    Started by gothicfruit‎, 12-06-2011 11:25 AM
    • Replies: 5
    • Views: 23,817
    12-06-2011, 12:10 PM Go to last post
  26. 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: 8,816
    12-06-2011, 08:58 AM Go to last post
  27. Biassing according to sample size

    I have a universe of points whose mean and median values are 50, and which has a broadly bell-shaped distribution of values between 0 and 100. ...

    Started by Ralph Lucas‎, 12-03-2011 08:16 AM
    • Replies: 2
    • Views: 2,307
    12-06-2011, 07:20 AM Go to last post
  28. dependent normal distribution

    I am given: 1) Y11,...,Y1n are dependent 2) Y1j follows n(theta1,sigma^2), j=1,...,n 3) corr(Y1j,Y1j')=p>0, j not equal to j' How can I find...

    Started by 9521j‎, 12-06-2011 02:57 AM
    • Replies: 3
    • Views: 2,000
    12-06-2011, 05:07 AM Go to last post
  29. Interpreting results

    I know this may seem like a basic problem but this is my first class and I have yet to totally understand SD, and Skew. I understand what each of...

    Started by scojo95‎, 04-25-2008 06:49 PM
    • Replies: 2
    • Views: 2,954
    12-06-2011, 04:41 AM Go to last post
  30. Alternative to Chi2

    Hello, I am comparing proportions but the 2 samples have very different sizes with one of them being really big. Example: 1/92 vs 16/58232 which...

    Started by mousme‎, 12-06-2011 04:31 AM
    • Replies: 0
    • Views: 2,757
    12-06-2011, 04:31 AM Go to last post
  31. Finding Standard Deviation

    Hello everyone. I am new here, so excuse me if I sound a little too noobish. I am currently faced with the current problem on my homework. It isn't...

    Started by PhatKroger10‎, 12-06-2011 12:05 AM
    2 Pages
    1 2
    • Replies: 23
    • Views: 11,479
    12-06-2011, 02:48 AM Go to last post
  32. Hypothesis testing where there's no significance and P-value is under 1

    The question is "If a level of significance were not specified, what conclusion would be reached and why?". My z-score from the questions was 2.5193,...

    Started by Brody Butchart‎, 12-05-2011 10:03 PM
    • Replies: 6
    • Views: 2,846
    12-06-2011, 12:11 AM Go to last post
  33. Critical Value

    One final question from me: "Two years ago, 45% of people surveyed said they preferred tea with their breakfast over coffee. The following table...

    Started by Pythons80‎, 12-05-2011 06:18 PM
    • Replies: 2
    • Views: 1,955
    12-05-2011, 10:31 PM Go to last post
  34. Wald-Wolfowitz Run statistic help

    I'm looking to prove the formula for the mean of the Wald-Wolfowitz run test. The formula is given by +1, or...

    Started by nonparametric_princess‎, 12-05-2011 10:09 PM
    • Replies: 1
    • Views: 3,115
    12-05-2011, 10:22 PM Go to last post
  35. Could use a nonparamtric test sugestion...

    I'm dealing with 12 data points, in the for (Xi,Yi), and I was looking for the optimal nonparametric test to determine if the two data points are...

    Started by nonparametric_princess‎, 12-04-2011 02:56 AM
    • Replies: 2
    • Views: 1,855
    12-05-2011, 08:16 PM Go to last post
  36. Help with Hypothesizing Quesiton

    Q. Suppose that a memory test has a mean of 50 and a standard deviation of 6. seven reseachers claim to be able to improve people's memory through...

    Started by sarsshadow‎, 12-05-2011 02:43 PM
    • Replies: 6
    • Views: 4,821
    12-05-2011, 08:13 PM Go to last post
  37. Probability question

    This question shouldn't be very hard but I don't know which formula to use or how to go about getting the answer, which is .0668. Here's the...

    Started by Pythons80‎, 12-04-2011 05:11 PM
    • Replies: 10
    • Views: 2,363
    12-05-2011, 05:56 PM Go to last post
  38. Finding the Sufficient Statistic of Weibull Distribution.

    So I have a Weibull Distribution with two parameters with the following pdf: f(x/\alpha,\beta) = \frac{\beta}{\alpha^\beta} x^{\beta-1} exp ...

    Started by MegaMan‎, 12-02-2011 01:20 PM
    2 Pages
    1 2
    • Replies: 28
    • Views: 17,413
    12-05-2011, 04:29 PM Go to last post
  39. Interaction term

    Hi, im having a bit trouble to understand this question. Add the interaction term dadcoll*momcoll to the regression you have. what does the...

    Started by marqito‎, 12-04-2011 01:56 PM
    • Replies: 1
    • Views: 2,803
    12-05-2011, 03:23 PM Go to last post
  40. Help needed! Main effect and interaction question

    I have a MINITAB printout I was hoping someone could help me with. My question is- from the table below how do i distinguish between a main effect...

    Started by ariele‎, 12-03-2011 06:53 PM
    interaction effect, main effect
    • Replies: 1
    • Views: 1,600
    12-05-2011, 03:16 PM Go to last post
  41. help with minitab

    How would I go about setting this up in minitab, to do a Friedman nonparametric test,so that it will compute the Fr statistic for me?

    Started by dana1‎, 12-05-2011 12:55 PM
    • Replies: 0
    • Views: 2,146
    12-05-2011, 12:55 PM Go to last post
  42. Assistance with Testing Null and Alternative Hypothesis

    A survey of the wine market has shown that the preferred wine for 17% of Americans is merlot. A wine producer in California where merlot is produced...

    Started by dbm4891‎, 12-05-2011 11:14 AM
    • Replies: 5
    • Views: 3,302
    12-05-2011, 12:36 PM Go to last post
  43. Channel 4 programme on stats

    Somebody mentioned to me a while back that there was a programme on Channel 4 about a bloke who said everything in world could be converted to...

    Started by Layo909‎, 12-05-2011 05:04 AM
    • Replies: 1
    • Views: 1,648
    12-05-2011, 05:08 AM Go to last post
  44. Quick questions…

    1. can count data (integers) be used in linear regression?* 2. Can the mean value of many sample of integers be classed as a continuous variable?...

    Started by Layo909‎, 12-04-2011 08:16 AM
    • Replies: 6
    • Views: 172,064
    12-05-2011, 04:35 AM Go to last post
  45. Which Statistics to Use?

    Hi, I am kinda moving towards my firs project in Marketing research so kind of new and my first post on this forum. I am doing a research on a...

    Started by vmathur007‎, 12-02-2011 02:55 AM
    • Replies: 5
    • Views: 2,315
    12-05-2011, 12:32 AM Go to last post
  46. Exclamation time series

    Hi, just wondering whether someone can confirm how to do this properly, given a tabulated set of values of a time series for 4 quarters in each year...

    Started by mathy1991‎, 12-04-2011 12:48 PM
    arima, average, time series
    • Replies: 1
    • Views: 1,203
    12-04-2011, 11:21 PM Go to last post
  47. Regression Analysis on Likert Responses

    Hi, I want to do Regression Analysis on the 5-scale Likert Responses. I have over 125 responsdents giving their ratings on 9 questions. Can you...

    Started by prash_sh‎, 12-04-2011 12:39 AM
    • Replies: 3
    • Views: 2,571
    12-04-2011, 02:13 PM Go to last post
  48. What is ratio 86:131 in simplest form?

    …and how did you work it out?

    Started by Layo909‎, 12-04-2011 08:08 AM
    • Replies: 3
    • Views: 3,311
    12-04-2011, 08:34 AM Go to last post
  49. biostatistic

    A diabetes clinic in Nottingham decided to invite all of their patients aged between 30 and 65 for a routine health check. Of the 2674 patients who...

    Started by tariq_sohaib‎, 12-03-2011 04:35 AM
    • Replies: 3
    • Views: 2,218
    12-03-2011, 06:40 PM Go to last post
  50. Is chi-squared suitable for this data?

    Hi. It has been a long time since I have done any statistics and have never been very good. I would appreciate it if some one could help me. I...

    Started by bob87‎, 12-03-2011 04:16 PM
    • Replies: 3
    • Views: 1,457
    12-03-2011, 05:32 PM Go to last post
  51. Stats help needed

    Hi guys..could do with a bit of help on some stats.. I've observed 4 species of birds and recorded probes into sediment within a 2 minute period and...

    Started by gratts‎, 12-03-2011 03:50 PM
    • Replies: 3
    • Views: 1,553
    12-03-2011, 04:34 PM Go to last post
  52. 3 boxes with each 2 balls

    Already solved

    Started by Christiaan Rademakers‎, 12-03-2011 02:50 PM
    • Replies: 0
    • Views: 2,039
    12-03-2011, 02:50 PM Go to last post
  53. Is mean significant and not abnormal?

    Hi everyone! I am having some troubles with interpreting the significance of mean. Mean= 0.19609 St. Dev=0.12341 n=141 I get t-statistic of...

    Started by Mistermishka‎, 12-01-2011 08:55 AM
    means, significance, t-test
    • Replies: 4
    • Views: 2,234
    12-03-2011, 02:16 PM Go to last post
  54. Wink $60 - tutor wanted

    $60 an hour. R code Logistic and Poisson Regression Central Limit Theorem ANOVA Single, two pop tests Simple and Multiple Linear Regression...

    Started by duval‎, 12-02-2011 04:14 PM
    3 Pages
    1 2 3
    • Replies: 36
    • Views: 8,239
    12-03-2011, 01:44 PM Go to last post
  55. Poisson regression using GLM with log link VS Poisson regression using identity link

    Hey guys, Thought I'd share this since I just learned it recently and found it interesting. I wasn't aware that there's a difference between...

    Started by Link‎, 12-03-2011 12:58 PM
    • Replies: 2
    • Views: 4,321
    12-03-2011, 01:30 PM Go to last post
  56. sample size unequal probabiity

    how do you decide what n should be for a survey with unequal probability selection if you specify a margin of error of 3 percent? im interested in...

    Started by interestednew‎, 12-02-2011 06:28 PM
    • Replies: 9
    • Views: 2,217
    12-03-2011, 03:42 AM Go to last post
  57. One-way ANOVA homework help

    My teacher asked the following (and the first part of my answer is included): 1. We are interested whether Motivation (mot) is different among...

    Started by ALT803‎, 12-02-2011 05:02 PM
    • Replies: 10
    • Views: 3,254
    12-02-2011, 06:17 PM Go to last post
  58. R gui statistics, tutor me $30 hour, negotiable

    Please teach me R programming language and how to compute the following statistical topics with it: Logistic and Poisson Regression Central...

    Started by duval‎, 12-02-2011 02:13 PM
    job, statistics, tutor
    • Replies: 3
    • Views: 2,461
    12-02-2011, 05:14 PM Go to last post
  59. Smile how to calculate the between and within variance for rate data

    My specific question will be how to calculate the between and within variance for rate data. It seems like an ANOVA, but the outcome is rate or...

    Started by zhongdianshi‎, 12-02-2011 02:27 PM
    • Replies: 0
    • Views: 1,848
    12-02-2011, 02:27 PM Go to last post
  60. Symbols used in Simple Regression

    I am a little confused about the terminology used in simple regression. The professor taught us that SSY = SSR + SSE. But on our test yesterday,...

    Started by Stickstat‎, 12-02-2011 12:36 PM
    • Replies: 8
    • Views: 4,053
    12-02-2011, 02:13 PM Go to last post

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