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Forum: Statistics

Statistics course and homework discussion. Elementary statistics.

  1. 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: 66,624
    09-30-2005, 09:44 AM Go to last post
  2. 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: 196,569
    07-16-2014, 11:01 AM Go to last post
  1. Hypothesis Testing Question Help

    I've been lurking for some time now, soaking up knowledge, but now I'm stuck on finding p-values for the following question. Q: A board game...

    Started by zigzager‎, 11-18-2012 03:18 AM
    • Replies: 11
    • Views: 2,859
    11-20-2012, 04:37 PM Go to last post
  2. Application of PCA component scores in regression model.

    Hi, Is there anybody who is more or less "fluent" in principle component analysis? I'd need to use 20 categorical variables (2 or 5 or 7...

    Started by ZikO‎, 09-08-2011 02:47 PM
    • Replies: 12
    • Views: 7,083
    09-15-2011, 06:16 AM Go to last post
  3. Question Very long post - need help thanks

    Dear All, I am writing to you because I have got a lot of troubles with some concepts regarding Generalised Linear Models. I need to understand...

    Started by ZikO‎, 12-21-2011 11:56 AM
    2 Pages
    1 2
    glm, linear regression, link function, mle, pdf
    • Replies: 18
    • Views: 4,537
    12-28-2011, 05:41 PM Go to last post
  4. Expected value from Hessian

    Hi, Can someone tell me what the expected value from second derivative of L(y|x) over B0 and B1 or B0^2 or B1^2 or standard derivation is? I have...

    Started by ZikO‎, 02-08-2012 03:43 PM
    • Replies: 4
    • Views: 3,026
    02-09-2012, 04:03 PM Go to last post
  5. statistical significance betwee 2 groups

    Hello all, I'm trying to analyze data from 2 different groups for statistically significant differences and could definitely use some help here....

    Started by zikomo‎, 05-24-2014 06:59 AM
    • Replies: 1
    • Views: 985
    05-24-2014, 07:41 AM Go to last post
  6. My Test Grade and Asymmetrical Skewing

    I took a test 2 weeks ago and the professor handed back the grades today. The average was 48 Low 18 High 84 my grade was 60 I'm not sure...

    Started by zin.rokh‎, 05-16-2014 02:10 AM
    • Replies: 2
    • Views: 1,389
    05-16-2014, 02:53 AM Go to last post
  7. Factorial design question about blocking?

    _a factorial experiment question: say I have a 2^3 factorial, each cell with n observations. There are two factors (lets call them A, B) that...

    Started by zitro‎, 01-31-2009 07:40 PM
    • Replies: 5
    • Views: 3,666
    02-02-2009, 01:00 AM Go to last post
  8. Correlation between two ranked independent lists

    Hello, I have two independent lists X and Y none of the yi depend on xi. Total number of elements in both the list is same, List X is generated...

    Started by ziuss‎, 10-29-2015 06:00 AM
    • Replies: 0
    • Views: 810
    10-29-2015, 06:00 AM Go to last post
  9. Usability study using a t-test

    What is the null hypothesis in this usability study?

    Started by zivajones02‎, 04-03-2013 11:40 AM
    • Replies: 1
    • Views: 1,788
    04-03-2013, 01:55 PM Go to last post
  10. Modeling dependencies

    Hi everybody I am looking for a method to assess the dependencies between random variables (Cross sectional data) And I know that I can use...

    Started by zizou428‎, 06-05-2015 01:38 PM
    • Replies: 7
    • Views: 1,705
    06-07-2015, 02:23 AM Go to last post
  11. Am I using T-Test correctly?

    I am sampling small group of 11 people. I am trying to see the effect of changing one factor in the test. I sampled the 11 people before the change...

    Started by zi_pota‎, 11-21-2008 09:16 PM
    • Replies: 3
    • Views: 2,487
    11-23-2008, 05:36 AM Go to last post
  12. Confidence interval & Hypothesis questions- Basic stats-

    Hi all, I had a question I was working on and needed a review on the approach I was taking & figure out if the answer I have gotten is correct: ...

    Started by zkge‎, 10-13-2012 10:03 PM
    • Replies: 0
    • Views: 1,803
    10-13-2012, 10:03 PM Go to last post
  13. Abnormal Interaction Effect

    Hey people, After I have conducted an ordered logistic regression with a DV and two IVs, I get the following result: Two main effects (IV1 on DV,...

    Started by Zloy‎, 03-26-2014 02:13 PM
    • Replies: 0
    • Views: 1,014
    03-26-2014, 02:13 PM Go to last post
  14. Question Tracking progression trend of body and fat weight changes

    Hello I have been trying to figure out how to track if my weight loss is either trending postive or negative. That is; I want to loose FAT mass,...

    Started by zoazim‎, 08-18-2014 05:27 AM
    • Replies: 4
    • Views: 2,548
    08-23-2014, 04:20 PM Go to last post
  15. Comparing percentages based on qualitative data

    Dear all, Could someone please advise me which test to use/how to compare two percentages that are based on qualitative data? I have searched SPSS...

    Started by ZoeT‎, 05-24-2013 05:16 AM
    • Replies: 1
    • Views: 1,421
    05-24-2013, 05:22 AM Go to last post
  16. Question How many yellow balls in the basket?

    I have 48 baskets that contain 100 balls in 10 different colors randomly placed. There is anywhere from 1 ball to 10 balls in each basket, but no...

    Started by Zolie‎, 03-13-2012 11:18 PM
    • Replies: 7
    • Views: 2,436
    03-14-2012, 08:49 AM Go to last post
  17. Which significance test should I use?

    I have a research questionnaire using a five point Likert scale (not at all, little, neutral, considerable, significant). I want to statistically...

    Started by Zolitoo‎, 01-27-2017 03:07 PM
    • Replies: 1
    • Views: 1,311
    01-28-2017, 04:44 AM Go to last post
  18. Statistics Value Regression Question

    I need help with this question! The graph is in the picture below! A popular, nationwide standardized test taken by high-school juniors and...

    Started by zolton5971‎, 03-04-2015 03:51 PM
    • Replies: 1
    • Views: 1,453
    03-11-2015, 09:07 AM Go to last post
  19. Lightbulb Difficulty in choosing the ideal target group? Any Suggestions.

    Hi, I am trying to study the prospects of Internet banking in one of the states in India. I have constructed the research model and have seven...

    Started by zombie‎, 11-15-2013 01:40 AM
    confused, ideal respondents
    • Replies: 0
    • Views: 871
    11-15-2013, 01:40 AM Go to last post
  20. Need help with Hypothesis test!!!

    Okay I can't seem to figure out this problem. Would really appreciate any help that can be given. A sample of 81 account balances of a credt...

    Started by Zonie987‎, 12-12-2005 03:17 AM
    • Replies: 3
    • Views: 5,129
    12-14-2005, 08:14 AM Go to last post
  21. How to work out min & max from values for range, median and mode

    Hi, I was wondering if you could help me with the following (very basic) stats problem. How do I find out the minimum and maximum when I don't...

    Started by zonkil15‎, 04-21-2014 05:02 AM
    • Replies: 6
    • Views: 1,589
    04-21-2014, 02:20 PM Go to last post
  22. Question Analyzing/Understanding Results from Factor Analysis

    I ran a factor analysis on a data set (running both an orthogonal and oblique rotation). The data is from surveys completed by middle-school students...

    Started by Zooi‎, 11-17-2009 12:57 PM
    • Replies: 1
    • Views: 3,583
    11-17-2009, 03:12 PM Go to last post
  23. Mixing/merging two datasets

    For my research, I need to estimate a dependent variable from 4-5 independent ones. (estimating corrosion rate from environmental variables) From my...

    Started by zoparrat‎, 02-06-2008 11:49 PM
    • Replies: 0
    • Views: 2,548
    02-06-2008, 11:49 PM Go to last post
  24. Simulation

    Hi Guys I'm working on 800 bivariate data. ( loss & Expense) . I've found fitted distribution which was Pareto. I also worked on Copula to find the...

    Started by Zore‎, 10-05-2016 04:52 AM
    • Replies: 0
    • Views: 1,055
    10-05-2016, 04:52 AM Go to last post
  25. How can I do multi column sort?

    Suppose I've a table with multiple columns like this for applicants for a job Applicant name || Degree in Computer || salary John ...

    Started by zornado‎, 09-13-2011 07:50 PM
    • Replies: 12
    • Views: 3,989
    09-17-2011, 02:35 AM Go to last post
  26. Comparing responses within a sample

    So maths in general was never my strong point, let alone statistics! But alas, here I am trying to get my head around it for my undergraduate...

    Started by ZotuX‎, 02-09-2012 09:59 AM
    • Replies: 2
    • Views: 1,466
    02-10-2012, 09:16 AM Go to last post
  27. Transform confusion matrix to a similarity matrix

    Hi, I have a simple question. I want to run a MDS from some data of close set identification. Therefore, I have a 12X12 confusion matrix and I...

    Started by zozo‎, 06-23-2009 06:50 AM
    • Replies: 0
    • Views: 3,860
    06-23-2009, 06:50 AM Go to last post
  28. Error on mean or standard deviation

    I have a plot which has average values on the y axis but the averages are based on only 3 samples. Should I use the standard deviation or the error...

    Started by ZoZoeee123‎, 11-17-2013 10:04 AM
    error on mean, standard deviation
    • Replies: 0
    • Views: 898
    11-17-2013, 10:04 AM Go to last post
  29. Is the game fair?

    Hi, I have recorded the results of a binomial game (1 = win, 0 = lose.) The sequence is presented below. I am asked to provide compelling...

    Started by ZPlayer‎, 12-03-2008 09:09 AM
    • Replies: 9
    • Views: 4,281
    12-04-2008, 05:03 PM Go to last post
  30. Consecutive wins

    Hello all, I have played binomial game and recorded wins and losses. I played 179 rounds and then analyzed the resulting sequence. I recorded the...

    Started by ZPlayer‎, 12-10-2008 10:03 PM
    • Replies: 5
    • Views: 4,250
    12-11-2008, 02:45 PM Go to last post
  31. Compare std deviation to know which dataset has more data points closer to mean?

    Hi I have two datasets each with different mean and standard deviation (std). We know that, std is a measure of the dispersion of the numbers from...

    Started by zqzuk‎, 05-26-2013 06:25 PM
    • Replies: 2
    • Views: 1,223
    05-28-2013, 11:41 AM Go to last post
  32. evaluating Kruskal-Wallis test results

    Using an online statistical tool I evaluated 5 group of students' (self-identified ethnic groups with na= 105; nb= 50; nc= 44; nd= 43; ne= 33.) ...

    Started by Zsuzsa‎, 12-21-2016 04:17 PM
    • Replies: 7
    • Views: 3,816
    12-30-2016, 03:02 PM Go to last post
  33. using Mann Whitney

    I am trying to analyze a survey that asked students to respond to questions e.g. “In my opinion, the economic system in the US leads to an unfair...

    Started by Zsuzsa‎, 12-28-2016 09:06 AM
    • Replies: 0
    • Views: 2,580
    12-28-2016, 09:06 AM Go to last post
  34. Standard deviation for proportions

    Hi,,,can u please explain me how to calculate standard deviation and standard error for a binomial distribution when you have several samples? For...

    Started by Zue‎, 12-15-2013 03:27 AM
    • Replies: 0
    • Views: 2,142
    12-15-2013, 03:27 AM Go to last post
  35. Creating flags for a variable

    Hi all I was wondering if I could get some advice please. I have this problem at work that has had me stumped for a few days. I have the...

    Started by zugzwang‎, 10-02-2008 07:07 AM
    • Replies: 1
    • Views: 3,055
    10-03-2008, 10:31 PM Go to last post
  36. Cronbachs alpha

    I have recently created and distributed a survey regarding culture and usability. I want to research how cultural background gives people a different...

    Started by zulaff2000‎, 05-01-2008 08:28 AM
    • Replies: 0
    • Views: 1,971
    05-01-2008, 08:28 AM Go to last post
  37. Mgf

    WHo can we find the MGF for this Pdf? f(x) = 0.5^x x=1,2,3,...... f(x) = 0 ...

    Started by zulkfal‎, 10-04-2009 01:47 PM
    • Replies: 3
    • Views: 3,679
    10-04-2009, 04:10 PM Go to last post
  38. MGF of lognormal distribution

    Let x ~ N (μ,σ^2 ) and consider the lognormal r.v. y= e^x. Given the MGF of the normal distribution M_x (t)= e^((μt+0.5σ^2 t^2)). How to compute...

    Started by zulkfal‎, 10-08-2009 12:54 AM
    • Replies: 2
    • Views: 10,811
    10-08-2009, 12:46 PM Go to last post
  39. Confused on Exponential PDF

    Hi, I am a bit confused on the Exponential prob density function. I am clear on a simple problem involving a poisson arrival mechanism and how to...

    Started by zuludogm‎, 05-28-2006 04:13 AM
    • Replies: 0
    • Views: 1,848
    05-28-2006, 04:13 AM Go to last post
  40. Question Confused on Exponential PDF

    Hi, I am a bit confused on the Exponential prob density function. I am clear on a simple problem involving a poisson arrival mechanism and how to...

    Started by zuludogm‎, 05-30-2006 01:07 AM
    • Replies: 0
    • Views: 1,993
    05-30-2006, 01:07 AM Go to last post
  41. How can I compare the relative effects between values of a categorical IV?

    I am a social science phd student trying to figure out a statistical test for small conference presentation I am working on. However, I realized I...

    Started by Zulufox‎, 08-22-2011 02:46 PM
    • Replies: 1
    • Views: 2,351
    08-22-2011, 02:55 PM Go to last post
  42. Needd help!!ASAP!!!!Please!!!!!!!!

    Weekly demand for packs of a certain make of chocolate trifle at a major supermarket store has a Normal distribution with mean of 200 and standard...

    Started by zxadriano‎, 11-08-2008 09:48 AM
    • Replies: 0
    • Views: 1,906
    11-08-2008, 09:48 AM Go to last post
  43. Urgent. I should use T Test or Z test?

    A beer bottling factory labels the bottles for one particular type of beer as containing 330ml of beer. In order to err on the safe side, it actually...

    Started by zxadriano‎, 12-06-2008 06:18 AM
    • Replies: 3
    • Views: 4,828
    12-07-2008, 02:03 PM Go to last post
  44. What doed this problem mean?

    A newspaper article recently claimed that, in the clothing industry, the wage per hour of a manual worker is higher in the South than in the North of...

    Started by zxadriano‎, 12-06-2008 06:37 AM
    • Replies: 0
    • Views: 2,327
    12-06-2008, 06:37 AM Go to last post
  45. variance of population mean...

    .. when the population consists of two sub-populations. size of sub-population1: 20.000 size of sub-population2: 10.000 size of sample...

    Started by zxc‎, 10-30-2008 01:07 PM
    • Replies: 10
    • Views: 5,070
    11-08-2008, 08:43 AM Go to last post
  46. to use or not to use weights in factor and cluster analysis

    What do you think? Which one bias results less, omitting weights or using weights?

    Started by zxc‎, 05-21-2009 07:09 AM
    • Replies: 0
    • Views: 2,225
    05-21-2009, 07:09 AM Go to last post
  47. graphs to represent data

    Hello, I have IQ scores for 2 matched-sample groups (exposure to stimulating music before the testing and no exposure) and the n for each group is...

    Started by zxcvbnm‎, 02-21-2009 04:20 PM
    • Replies: 2
    • Views: 2,272
    02-24-2009, 01:30 AM Go to last post
  48. difference between the proportion. Situation a,b or c

    done lok this now

    Started by zxcvbnmlo‎, 04-24-2011 08:19 AM
    • Replies: 1
    • Views: 2,794
    04-24-2011, 07:15 PM Go to last post
  49. Question whether Y(employees injured) variation is due to X1(job function) or X2(population)

    Here is the actual question- There are 1000 employees in a firm, and the firm has four departments namely D1, D2, D3 and D4 with 100, 200, 300, 400...

    Started by Zznn‎, 08-25-2014 11:27 AM
    statistics business, statistics query
    • Replies: 10
    • Views: 2,048
    08-25-2014, 09:39 PM Go to last post
  50. variance of log(s^2)

    Y1,...,Yn are i.i.d. random variables from N(mu, sigma^2) distribution. s^2 = sum/(n-1) , where i = 1,...,n Find var(log(s^2)) My approach:...

    Started by zzzc‎, 11-17-2010 12:57 PM
    • Replies: 2
    • Views: 9,496
    12-01-2010, 11:18 AM Go to last post
  51. estimate using method of moment

    I need to estimate lambda0 and lambda1 using method of moments. I know E(X) = (lambda0+lambda1)/2 and E(X^2) = lambda0^2 + lambda1^2 So in...

    Started by zzzc‎, 11-20-2010 06:50 PM
    • Replies: 0
    • Views: 1,425
    11-20-2010, 06:50 PM Go to last post
  52. Might be a silly question about t-tests but...

    ...i really need some advice about how to go about comparing some means. Basically, I have the means and standard deviations for three different...

    Started by Zzzz‎, 11-10-2006 10:14 AM
    • Replies: 8
    • Views: 3,035
    11-10-2006, 01:33 PM Go to last post
  53. Multicollinearity....

    ... ok, anyone's thoughts on this would be great. I have a result in which my two IV predictors cancel out an IV, DV relationship. Thanks to John for...

    Started by Zzzz‎, 11-11-2006 04:57 PM
    • Replies: 0
    • Views: 3,134
    11-11-2006, 04:57 PM Go to last post
  54. Skewness and Kurtosis

    I have to 'show the standard error of the skewness and kurtosis as a footnote to a table' - any ideas on how this is expressed? I thought it might be...

    Started by Zzzz‎, 11-11-2006 03:47 AM
    • Replies: 2
    • Views: 3,707
    11-11-2006, 04:45 PM Go to last post
  55. coverting to T scores

    Hello, I'm using a measure called the Hospital Anxiety and Depression Scale and I wondering if there is a way to covert scores into T scores? I'm...

    Started by Zzzz‎, 11-17-2006 05:38 AM
    • Replies: 0
    • Views: 1,631
    11-17-2006, 05:38 AM Go to last post
  56. Power in regression studies

    Hi, can someone help me with an idiots guide to calculating power for a study using linear regression. I need power at .05 level and i have one IV,...

    Started by Zzzz‎, 11-30-2006 08:37 AM
    • Replies: 0
    • Views: 1,842
    11-30-2006, 08:37 AM Go to last post
  57. how can I evaluate chi-square CDF?

    Hello, I want to know how can I evaluate CDF of chi square by 1 degree of freedom in special point, Anybody can help?

    Started by z_stat‎, 01-22-2013 01:53 AM
    • Replies: 3
    • Views: 2,337
    01-22-2013, 09:30 AM Go to last post
  58. What test should I use?

    I trying to resolve this problem but I am getting frustrated. After listening to different opinion I am not sure anymore about what to do. 3 hens...

    Started by _Duke_‎, 04-16-2009 08:35 PM
    • Replies: 0
    • Views: 1,497
    04-16-2009, 08:35 PM Go to last post
  59. Practical significance

    The difference between two mean values is 103 units p-value is 0.00001 at alpha=0.05 95% confidence interval is (50, 150) difference of 100 units...

    Started by _joey‎, 08-07-2012 06:58 AM
    3 Pages
    1 2 3
    • Replies: 41
    • Views: 11,291
    08-08-2012, 12:15 PM Go to last post
  60. Dealing with Zero Values in a G-test

    Hello, I am dealing with some zero values which are not valid in a G-test. Is it appropriate to substitute zero with a 0.000001 for example? I...

    Started by ~alan~‎, 04-10-2013 08:59 PM
    • Replies: 0
    • Views: 1,383
    04-10-2013, 08:59 PM Go to last post

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