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Forum: Statistical Research

Statistical theory and methodology. Mathematical statistics. Parametric inference. Nonparametric inference.

  1. Sticky Thread Sticky: Proof of the day

    In this thread we post one (or more if you can't wait) proof a day. I'll start by proving the that V=\sigma^2(X'X)^{-1} in the linear...

    Started by Englund‎, 01-18-2014 04:56 AM
    • Replies: 14
    • Views: 18,620
    10-11-2014, 12:02 PM Go to last post
  1. Test for difference between ratio of means, unequal variance.

    Hello there, I an experimental design were I wish to test if the effect of a treatment on several subjects type is different to the effect of...

    Started by Sudders‎, 04-05-2011 04:01 PM
    • Replies: 5
    • Views: 6,199
    09-29-2015, 11:58 PM Go to last post
  2. Question Non normal likert scale Data?

    Hello all, I have a problem with stats procedures for a research paper. I have a sample size of 379 respondents with data collected with a 5...

    Started by Tai‎, 03-29-2012 03:42 AM
    • Replies: 5
    • Views: 10,280
    11-12-2012, 04:03 AM Go to last post
  3. Problem fitting an SEM with latent variable

    Hello, I am having trouble with a Structural Equation Model. As you can see in the attached picture, my main outcome variable (F4) is a latent...

    Started by jesse‎, 07-30-2012 12:24 AM
    • Replies: 5
    • Views: 2,274
    07-31-2012, 11:31 AM Go to last post
  4. Simple question

    Hello everyone.. This is my first post here, and I really think it's a great idea to have such forum.. Anyway, I have a simple question I...

    Started by Isra'a‎, 07-31-2012 06:58 PM
    • Replies: 5
    • Views: 2,031
    08-02-2012, 05:22 PM Go to last post
  5. Is a z-transformation appropriate in this case?

    Hi everyone :-) n=150 Everyone gets a test with 14 items and a variable "score" is calculated from the responses. Trouble is, 50 of my tests...

    Started by thegermanguy‎, 08-23-2012 01:48 PM
    • Replies: 5
    • Views: 1,770
    08-24-2012, 08:45 AM Go to last post
  6. Using Mann-Whitney test when all values in one data set are zero (SPSS vs Graphpad)

    I would be very grateful for advice on the following problem: I am examining the frequency in which political issues are reported in the national...

    Started by sunilaup‎, 08-27-2012 02:38 PM
    • Replies: 5
    • Views: 2,673
    08-29-2012, 03:50 AM Go to last post
  7. Cca

    Hello In CCA is it a must that the number of IV's to be less than or equal the number of DV's,i mean are there any assumptions or conditions about...

    Started by osamahamza‎, 09-26-2012 02:53 AM
    • Replies: 5
    • Views: 2,006
    09-30-2012, 02:32 AM Go to last post
  8. Paired t-test is significant and ANOVA is not, on what should I rely?

    Hello.. I have a question I hope someone can help me with. In my study, I have to groups; treatment group and a control (placebo) group, and I...

    Started by Isra'a‎, 11-10-2012 05:46 PM
    • Replies: 5
    • Views: 1,899
    11-11-2012, 10:05 AM Go to last post
  9. Wich data analysis to choose for my data?!

    Hello to everyone, I'm new on this forum and I thank the team for this site. Actually I'm working with some data and I don't know which can be the...

    Started by tsdl‎, 11-09-2012 07:47 PM
    • Replies: 5
    • Views: 1,761
    11-13-2012, 09:40 AM Go to last post
  10. Customer satisfaction survey (data analysis)

    Hi, We are doing a customer satisfaction survey on our school canteen. We are finished with the data collection and is now considering what...

    Started by lassekk‎, 11-27-2012 05:33 AM
    • Replies: 5
    • Views: 3,173
    11-28-2012, 02:13 AM Go to last post
  11. multivariate logistic regression

    I want to do multivariate logistic regression. Does it mean "one logistic regression with 2 dependent variables at the same time? Or Does it mean...

    Started by eunkum‎, 04-18-2013 12:02 PM
    • Replies: 5
    • Views: 3,237
    06-16-2013, 01:46 PM Go to last post
  12. statistical analysis- ANOVA, t test, questionnaire

    Hi all, I am doing a mini research in HCI filed which examine the differences between pen touch and finger touch on specific Smartphone. I have...

    Started by hila‎, 02-02-2013 10:49 AM
    • Replies: 5
    • Views: 3,369
    02-04-2013, 04:44 PM Go to last post
  13. non-parametric t-test with mean/SD = 0

    Hi All, quick question on non-parametric t-test I have 2 groups. 7 values each. Group One= 0, 0, 0, 0, 0, 0, 0 which of course is mean=0 and...

    Started by Misagh‎, 02-04-2013 04:20 PM
    non-parametric, sem
    • Replies: 5
    • Views: 3,517
    02-05-2013, 11:24 PM Go to last post
  14. ANOVA help? :)

    Basically i have two sets of data collected from two different locations. I know that both sets of data are not normally distributed, so they will...

    Started by EmmaWP‎, 02-13-2013 05:11 PM
    • Replies: 5
    • Views: 1,115
    02-13-2013, 05:32 PM Go to last post
  15. pair-wise comparison using contrasts

    I asked this question months ago, and did not get a response. So hopefully, someone can help me out here. Here, I am running a 2way repeated...

    Started by thecupofcoffee‎, 05-14-2013 02:01 AM
    • Replies: 5
    • Views: 1,423
    05-15-2013, 11:54 PM Go to last post
  16. Writing equations for latent growth curve models

    Hi all, I'm a PhD student currently working on an independent research project using latent growth curve modeling. This is my first time using...

    Started by omnibus‎, 05-31-2013 02:01 PM
    equation query, latent growth curve, longitudinal data, parallel process model
    • Replies: 5
    • Views: 2,079
    06-01-2013, 02:11 PM Go to last post
  17. How to test this mix of continuous and categorical data?

    Hello all. I'm working on this project and have the following variables: x (categorical, independent) y (continuous,independent) z...

    Started by KevinP‎, 07-02-2013 08:02 PM
    • Replies: 5
    • Views: 1,143
    07-02-2013, 08:56 PM Go to last post
  18. Logistic regresion with only discrete IV

    Hi, I saw a few binary logistic regressions in Minitab where we did not have any continuous variables and the analysis Minitab gave was simply the...

    Started by rogojel‎, 08-02-2013 06:48 AM
    • Replies: 5
    • Views: 3,601
    08-03-2013, 02:29 PM Go to last post
  19. Permanova design for BACI study (using Primer)

    my first question here! i need to do a few analyses on a biological dataset, and I am a bit puzzled about how to set my Permanova design. I use...

    Started by doddel‎, 08-01-2013 08:25 AM
    • Replies: 5
    • Views: 3,150
    08-09-2013, 03:51 AM Go to last post
  20. T-Test vs. Mann-Whitney U Test for ordinal data

    Hello all: Something at work made me wonder about this situation and I thought I'd ask here just to get some opinions. Imagine people were...

    Started by lancearmstrong1313‎, 08-20-2013 02:05 PM
    • Replies: 5
    • Views: 17,782
    08-21-2013, 05:29 AM Go to last post
  21. Question Sturges' Formula

    How can I prove Sturges' formula for determining number of classes in frequency distribution? k=Log2n+1 (n=number of data, k=number of classes)

    Started by masumeh‎, 09-27-2013 09:31 AM
    • Replies: 5
    • Views: 30,696
    09-27-2013, 12:01 PM Go to last post
  22. Permanova significant four fold interaction. How about 2 and 3 fold interactions?

    Dear, I have a problem considering the analysis of a design with 4 factors. I have a fully crossed design with 4 factors (Su,Sp,Sa,Te). When...

    Started by mrtwino‎, 09-26-2013 06:07 AM
    • Replies: 5
    • Views: 1,707
    09-26-2013, 06:09 PM Go to last post
  23. geometric argument for constraints on r_xz given r_xy and r_yz

    Today a labmate asked the following question: if we have three random variables x, y, z, and we know the correlations r_{xy} and r_{yz}, what...

    Started by Jake‎, 09-17-2013 01:17 AM
    • Replies: 5
    • Views: 4,021
    05-18-2015, 04:16 PM Go to last post
  24. A simple case that doesn't seem that simple

    I've been trying to find the best solution for my experiment. I don't like that much what my colleagues are using for the statistic test here. So I...

    Started by srd‎, 11-25-2013 06:43 AM
    • Replies: 5
    • Views: 2,068
    12-02-2013, 10:34 AM Go to last post
  25. question on Monte Carlo simulation

    I have a mean (mu) and its standard error (se) of variable X from the literature. I have a dataset of size n which doesn't have variable X. Now I...

    Started by sunny3333‎, 11-25-2013 03:35 PM
    • Replies: 5
    • Views: 1,910
    11-27-2013, 08:17 AM Go to last post
  26. No Standard Deviation

    Hello statistical geniuses, I have 450 items and I want to test a sample and be sure with 95% confidence that if all of my tested items are...

    Started by DAD‎, 01-13-2014 12:04 PM
    • Replies: 5
    • Views: 1,796
    01-13-2014, 04:00 PM Go to last post
  27. What to do if sample size is too big? (ttest)

    So I'm running ttests for a descriptive statistic table and all my results are significant, but I"m concerned that the sample size is too big 3,880...

    Started by vikingo‎, 01-23-2014 11:23 AM
    large sample size, power, pplot, sample size, ttest
    • Replies: 5
    • Views: 6,062
    02-01-2014, 05:47 PM Go to last post
  28. Pearson or Spearman?

    Hello all I know you're supposed to observe a scatterplot first in order to see if the shape is monotonic or linear to determine which test to...

    Started by gene2420‎, 02-18-2014 12:24 PM
    • Replies: 5
    • Views: 1,692
    02-24-2014, 03:06 PM Go to last post
  29. Basic question on Spearman's correlation coefficient

    Hey guys, If I understand correctly, when calculating Spearman's correlation coefficient you just rank your variables, and then calculate...

    Started by Hombre‎, 02-24-2014 11:05 AM
    • Replies: 5
    • Views: 1,272
    02-24-2014, 01:37 PM Go to last post
  30. Two IV's (Nominal, both multi-level), One DV (Interval). What do I run????

    Help needed, I am trying to escape ABD hell. I am only a couple of statistical procedures away from slaying the dissertation beast and have hit a...

    Started by jhayes‎, 02-20-2014 04:28 PM
    dependent variables, independent variables, multi level
    • Replies: 5
    • Views: 2,206
    02-27-2014, 03:15 PM Go to last post
  31. Post Correlation coefficient repeated measures

    Hi Everyone, I would like to measure the correlation between two quantitative variables. These variables measure the same thing but are obtained...

    Started by AkaKiwi‎, 03-23-2014 06:30 AM
    • Replies: 5
    • Views: 2,920
    03-26-2014, 04:17 AM Go to last post
  32. structuring a proof

    I am working on a problem to show that the non central f distribution is a generalization of the f distribution. I understand this conceptually but...

    Started by the42up‎, 04-08-2014 09:44 AM
    • Replies: 5
    • Views: 1,686
    04-08-2014, 10:12 AM Go to last post
  33. What does component signifies in Principal component analysis?

    Structure Matrix ......................................Component ...................................1 ..... 2 .....3 ......4 ...

    Started by rahul_panthri‎, 04-29-2014 06:35 AM
    • Replies: 5
    • Views: 1,396
    04-29-2014, 08:43 AM Go to last post
  34. Conditional expectation

    Hi everyone, I've usually seen the conditional mean of X_n given X_1,X_2,.X_n-1 expressed as shown on p. 5 of: ...

    Started by CLP_PS‎, 06-06-2014 02:07 PM
    • Replies: 5
    • Views: 2,493
    06-10-2014, 12:37 AM Go to last post
  35. Bayes statistics - sensitivity to priors

    Hi, I came across a statement in a review of a research field, where they were determining an unknown parameter using Bayesian statistics. The...

    Started by rogojel‎, 06-19-2014 06:51 AM
    bayes, prior probabilities, sensitivity
    • Replies: 5
    • Views: 2,144
    06-22-2014, 01:53 AM Go to last post
  36. Effect size for small non-parametric data

    Hi Guys, I would like to run a effect size test for a very small non-parametric analysis (n=4 per group), which one is the most recommended test?...

    Started by fabinha‎, 06-23-2014 09:13 PM
    • Replies: 5
    • Views: 3,089
    06-30-2014, 06:25 PM Go to last post
  37. Can you assign new observations into existing clusters?

    Have never done cluster analysis. Is a scenario like this possible/recommended... 1. Run 100 observations thru cluster analysis and end up with 4...

    Started by jawon‎, 07-01-2014 04:37 PM
    • Replies: 5
    • Views: 3,787
    07-07-2014, 03:45 PM Go to last post
  38. Is there a test...

    Hi there! I have a new work project and I'm finding it challenging to select the approriate test. I'm not even sure if the right test exists so...

    Started by danib‎, 07-23-2014 03:04 PM
    • Replies: 5
    • Views: 1,809
    07-23-2014, 10:54 PM Go to last post
  39. factor analysis

    Can I do a factor analysis with one dependent variable and one independent variable? Do I need to have at least two dependent variables to do a...

    Started by eunkum1‎, 07-28-2014 02:23 PM
    • Replies: 5
    • Views: 1,170
    07-29-2014, 09:02 AM Go to last post
  40. State the null and alternative hypothesis

    Dear all, Can someone please give me some advise on this one? I need to state the Ho en Ha hypothesis, I know how to do it in words but not in the...

    Started by Micheller‎, 11-12-2014 12:49 PM
    • Replies: 5
    • Views: 4,527
    11-16-2014, 01:09 PM Go to last post
  41. Sample size help!!

    Hello! New to the forum but would greatly appreciate any help people may have to offer... Essentially I am trying to organise a scientific study...

    Started by aglove‎, 11-13-2014 03:23 PM
    • Replies: 5
    • Views: 2,813
    11-17-2014, 03:53 PM Go to last post
  42. Post Which analysis i should use to test/support hypothsis ?

    Hello Can someone tell me which type of analysis I should use to test hypothesis ? Which analysis best show me measure between 2 constructs ?

    Started by hanialbarni‎, 12-01-2014 08:14 AM
    • Replies: 5
    • Views: 1,814
    12-01-2014, 11:49 PM Go to last post
  43. Lightbulb Accept Null hypothesis VS Reject Null hypothesis ?

    Hello Good evening everyone, I read about this for testing my hypothesis but still confusing me this accept/reject null hypothesis can...

    Started by hanialbarni‎, 12-02-2014 03:13 PM
    • Replies: 5
    • Views: 4,035
    12-03-2014, 05:38 AM Go to last post
  44. Post How to transform non-normal variable to normal distrubtion ?

    Hello Good morning, Can you please give me a way to transform non-normal variable in SPSS to normal distributions? We try LG10(DATA) as...

    Started by hanialbarni‎, 12-05-2014 07:36 AM
    • Replies: 5
    • Views: 2,238
    12-06-2014, 11:01 AM Go to last post
  45. Over-simple Stats?

    Hi all, This should hopefully be a really simple question but I think I am confusing myself over a throwaway comment that someone made.... Say...

    Started by smcdougall‎, 01-14-2015 11:35 AM
    hierarchical, multi level
    • Replies: 5
    • Views: 1,449
    01-15-2015, 09:16 AM Go to last post
  46. GIS data questions

    Hi All, I have to get some GIS data for a project I am working on but I honestly have no idea where to start. What I need is as follows: 1. I...

    Started by Lazar‎, 06-17-2015 08:09 PM
    • Replies: 5
    • Views: 1,051
    06-18-2015, 11:21 AM Go to last post
  47. post-hoc for nonparametric paired data in groups of unequal sizes

    I am trying to do post-hoc analysis for nonparametric data. The group sizes are unequal but are paired. I've found several tests online,...

    Started by skylandyu‎, 07-21-2015 01:54 PM
    • Replies: 5
    • Views: 2,294
    07-22-2015, 09:54 AM Go to last post
  48. advice on how to proceed

    Hello, I recently undertook to analyze a relatively simple data set. It includes estimates of tree species composition for several sites within...

    Started by wdmn‎, 11-07-2015 12:11 AM
    • Replies: 5
    • Views: 1,805
    11-10-2015, 12:37 PM Go to last post
  49. paired samples

    Hello! I have two separate group. On each group, I could have done paired samples t-test, but I want to compare between the two of them- is there...

    Started by talgef‎, 12-21-2015 06:56 AM
    • Replies: 5
    • Views: 1,570
    12-21-2015, 01:06 PM Go to last post
  50. probability formula

    Hello, I would like to know the formula that would allow me to do the following; Assume; 1. 200 total events occur in 100 days (ie; 2 events per...

    Started by FrankStats‎, 01-15-2016 03:11 PM
    formula, probaility
    • Replies: 5
    • Views: 1,372
    01-16-2016, 02:47 PM Go to last post
  51. Anova

    I am trying to find the effects of feed rate, cutting speed and depth of cut on surface roughness. I have five sets of feed rate ( 0.09, 0.10, 0.125,...

    Started by saad2733‎, 02-28-2016 01:42 PM
    anova, minitab
    • Replies: 5
    • Views: 2,545
    02-29-2016, 06:07 AM Go to last post
  52. Models comparison

    I have a time series data of 1000 points for each of the different machines. I tried different forecasting techniques to make a one step prediction....

    Started by Mukund‎, 03-14-2016 12:40 PM
    models comparison
    • Replies: 5
    • Views: 1,852
    03-15-2016, 06:44 AM Go to last post
  53. Which Non-parametric Significance Test Should I Use?

    Hi, I've been working on a little project. Last year I delivered pizzas. I recorded data for 300 of my deliveries like tip amounts, order totals,...

    Started by 13gentj‎, 06-07-2016 08:36 PM
    exact test, fail assumptions, non-normal, permutation test, randomization test
    • Replies: 5
    • Views: 2,039
    06-09-2016, 02:34 AM Go to last post
  54. Dealing with missing values in cluster analysis

    I am currently looking for a cluster algorithm to deal with a large amount of systematically missing values. In particular, I need to cluster...

    Started by fabiangmueller‎, 07-15-2016 05:04 PM
    • Replies: 5
    • Views: 1,146
    07-16-2016, 06:53 AM Go to last post
  55. Can I use gls if I don't need to use mixed models and var is not structured?

    I have a continuous variable that is related to a covariable linearly. I need to compare this relationship between months (24 months), but the...

    Started by mgow‎, 09-14-2016 08:17 AM
    generalised least squares, heteroscedasticity, independent observations, nlme
    • Replies: 5
    • Views: 1,750
    09-14-2016, 04:01 PM Go to last post
  56. Item Response Question

    I have received some survey data for 200 respondents. DV: Binary (20=1; 180=0) 20 IVs, Likert 5-point scale and currently treated as...

    Started by hlsmith‎, 11-10-2016 09:12 AM
    • Replies: 5
    • Views: 2,608
    11-14-2016, 03:21 AM Go to last post
  57. Propensity score matching - pre-treatment outcome variable

    Hi all, maybe this rather a silly question but I have not found anything helpful. I have two groups of samples which are basically a treatment and...

    Started by Chickencheese‎, 11-19-2016 08:14 AM
    control, matching, propensity score matching
    • Replies: 5
    • Views: 3,535
    12-05-2016, 03:20 PM Go to last post
  58. What kind of tests i can do to see if two diseases are related

    I am using data from this website (data is at the bottom of the page) for a case-study. For the sake of question lets stick to any of FluWatch sheet...

    Started by x509‎, 11-22-2016 11:04 AM
    • Replies: 5
    • Views: 3,129
    11-22-2016, 02:02 PM Go to last post
  59. Maximum number of groups in Kruskal Wallis one-way analysis of variance

    Is there a maximum number of groups in Kruskal Wallis' one-way ANOVA? I am looking at a data set with 42 separate groups and I am unsure if there...

    Started by feignfeign‎, 01-09-2017 11:02 PM
    • Replies: 5
    • Views: 2,832
    01-12-2017, 07:14 PM Go to last post
  60. Interpreting the interaction effect in a well known paper

    Attached you will find a well known research paper. If you go to page 438 (page 9 of the pdf file) you will find a model where: change in tax rate...

    Started by 12345678‎, 12-30-2016 04:25 PM
    • Replies: 5
    • Views: 3,899
    01-01-2017, 01:40 PM Go to last post

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