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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: 196,909
    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: 66,829
    09-30-2005, 09:44 AM Go to last post
  1. 2 groups with ratio(s); How to test between-/within-group differences?

    Hi statistics community I am wondering if anyone could please give me advice on my rather simple (I assume) statistical problem. I am working...

    Started by ~Narayan~‎, 08-28-2012 04:51 AM
    between-group differences, ratio, within-group difference
    • Replies: 9
    • Views: 3,301
    08-31-2012, 02:38 PM Go to last post
  2. Are these relationships significant (3 variables)? How to test?

    Hi again statistics community I have data on age at reproduction in male and female animals (females on X, males on Y in attached figure) and data...

    Started by ~Narayan~‎, 08-31-2012 02:49 PM
    • Replies: 3
    • Views: 2,202
    09-02-2012, 01:27 AM Go to last post
  3. multinomial logistic regression - assumptions violated?

    Hi everybody :) I ended up asking a few questions in another thread that however didn't have a matching title, which probably explains why nobody...

    Started by ~Narayan~‎, 09-03-2012 04:00 PM
    assumptions, independence, logistic regression, overdispersion
    • Replies: 0
    • Views: 1,818
    09-03-2012, 04:00 PM Go to last post
  4. 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: 1,397
    04-10-2013, 08:59 PM Go to last post
  5. 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: 11,422
    08-08-2012, 12:15 PM Go to last post
  6. 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: 1,518
    04-16-2009, 08:35 PM Go to last post
  7. 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: 2,364
    01-22-2013, 09:30 AM Go to last post
  8. 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: 3,056
    11-10-2006, 01:33 PM Go to last post
  9. 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: 3,158
    11-11-2006, 04:57 PM Go to last post
  10. 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: 3,736
    11-11-2006, 04:45 PM Go to last post
  11. 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: 1,647
    11-17-2006, 05:38 AM Go to last post
  12. 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: 1,857
    11-30-2006, 08:37 AM Go to last post
  13. 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: 9,558
    12-01-2010, 11:18 AM Go to last post
  14. 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: 1,437
    11-20-2010, 06:50 PM Go to last post
  15. 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: 2,085
    08-25-2014, 09:39 PM Go to last post
  16. 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: 2,807
    04-24-2011, 07:15 PM Go to last post
  17. 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: 2,296
    02-24-2009, 01:30 AM Go to last post
  18. 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: 5,090
    11-08-2008, 08:43 AM Go to last post
  19. 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: 2,244
    05-21-2009, 07:09 AM Go to last post
  20. 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: 1,926
    11-08-2008, 09:48 AM Go to last post
  21. 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: 4,858
    12-07-2008, 02:03 PM Go to last post
  22. 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: 2,356
    12-06-2008, 06:37 AM Go to last post
  23. 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: 2,359
    08-22-2011, 02:55 PM Go to last post
  24. 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: 1,863
    05-28-2006, 04:13 AM Go to last post
  25. 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: 2,009
    05-30-2006, 01:07 AM Go to last post
  26. 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: 3,696
    10-04-2009, 04:10 PM Go to last post
  27. 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: 10,876
    10-08-2009, 12:46 PM Go to last post
  28. 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: 1,985
    05-01-2008, 08:28 AM Go to last post
  29. 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: 3,083
    10-03-2008, 10:31 PM Go to last post
  30. 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: 2,174
    12-15-2013, 03:27 AM Go to last post
  31. 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: 3,843
    12-30-2016, 03:02 PM Go to last post
  32. 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: 2,596
    12-28-2016, 09:06 AM Go to last post
  33. 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: 1,242
    05-28-2013, 11:41 AM Go to last post
  34. 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: 4,295
    12-04-2008, 05:03 PM Go to last post
  35. 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: 4,270
    12-11-2008, 02:45 PM Go to last post
  36. 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: 902
    11-17-2013, 10:04 AM Go to last post
  37. 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: 3,898
    06-23-2009, 06:50 AM Go to last post
  38. 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: 1,487
    02-10-2012, 09:16 AM Go to last post
  39. 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: 4,015
    09-17-2011, 02:35 AM Go to last post
  40. 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: 1,080
    10-05-2016, 04:52 AM Go to last post
  41. 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: 2,590
    02-06-2008, 11:49 PM Go to last post
  42. 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: 3,592
    11-17-2009, 03:12 PM Go to last post
  43. 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: 1,599
    04-21-2014, 02:20 PM Go to last post
  44. 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: 5,172
    12-14-2005, 08:14 AM Go to last post
  45. 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: 879
    11-15-2013, 01:40 AM Go to last post
  46. 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: 1,475
    03-11-2015, 09:07 AM Go to last post
  47. 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: 1,326
    01-28-2017, 04:44 AM Go to last post
  48. 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: 2,462
    03-14-2012, 08:49 AM Go to last post
  49. 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: 1,443
    05-24-2013, 05:22 AM Go to last post
  50. 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: 2,569
    08-23-2014, 04:20 PM Go to last post
  51. 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: 1,034
    03-26-2014, 02:13 PM Go to last post
  52. 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: 1,814
    10-13-2012, 10:03 PM Go to last post
  53. 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: 2,507
    11-23-2008, 05:36 AM Go to last post
  54. 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: 1,716
    06-07-2015, 02:23 AM Go to last post
  55. 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: 1,799
    04-03-2013, 01:55 PM Go to last post
  56. 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: 816
    10-29-2015, 06:00 AM Go to last post
  57. 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: 3,691
    02-02-2009, 01:00 AM Go to last post
  58. 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: 1,406
    05-16-2014, 02:53 AM Go to last post
  59. 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: 1,004
    05-24-2014, 07:41 AM Go to last post
  60. 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: 7,173
    09-15-2011, 06:16 AM Go to last post

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