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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: 18,649
    10-11-2014, 12:02 PM Go to last post
  1. Making statistical inference considerations

    May I ask what are the considerations in making statistical inference? I have the following ideas in my mind, but I am not sure what are really...

    Started by imjae2‎, 08-26-2012 05:02 AM
    inference, inferential statistics, probability
    • Replies: 0
    • Views: 2,246
    08-26-2012, 05:02 AM Go to last post
  2. Bayesian Statistics

    Hello I need an example, as simple as possible to Bayesian analysis. I was thinking about a simple proportion problem, perhaps with a credibility...

    Started by NN_STAT‎, 07-09-2012 03:59 AM
    • Replies: 3
    • Views: 2,066
    08-25-2012, 07:14 PM Go to last post
  3. Autocorrelation of panel data: need literature!

    I have (so-called) dynamical monte carlo model of a number of identical chains within simulation box And i've measured some data (like radius of...

    Started by icegood‎, 08-21-2012 06:13 AM
    • Replies: 2
    • Views: 1,837
    08-24-2012, 11:38 AM Go to last post
  4. 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: 1,771
    08-24-2012, 08:45 AM Go to last post
  5. MANOVA vs multiple ANOVAs

    Hello, I have 3 variables that have been measured on 4 occasions and a sample size of 16. I was considering a repeated measures MANOVA to...

    Started by Laf‎, 08-22-2012 05:45 PM
    repeated measures anova, repeated measures manova
    • Replies: 3
    • Views: 2,377
    08-24-2012, 01:41 AM Go to last post
  6. Question Pearson's chi-test for more than 2x2

    So, I have one stat book (Discovering Statistics by Andy Field; great book) that discusses Pearson's chi-test and how it's only applicable to a 2x2...

    Started by Trolle‎, 08-22-2012 12:27 PM
    chi square, contingency table, pearson chi square, spss
    • Replies: 2
    • Views: 2,959
    08-23-2012, 04:30 AM Go to last post
  7. repeated measures MANOVA - 3 measurements in time - interpretation

    Hello, I am running a repeated measures MANOVA (in SPSS) to determine whether there are statistically significant differences in a group over time...

    Started by Laf‎, 08-22-2012 05:35 AM
    manova, repeated measures, repeated measures manova
    • Replies: 0
    • Views: 1,099
    08-22-2012, 05:35 AM Go to last post
  8. sum of truncated Normal Variables

    Hello all, I am trying to find if there exists a closed solution for the following: X~N(u,var) {normal dist) Y~N((u,var)|Y>a) {truncated normal...

    Started by alondo‎, 08-21-2012 03:23 AM
    distibution, normal, probability, sum of normal, truncated
    • Replies: 0
    • Views: 3,178
    08-21-2012, 03:23 AM Go to last post
  9. Non-parametric confidence interval.

    Hi there, I am trying to understand how the attached paper estimated the confidence intervals for the data reported in Fig. 2. All the authors had...

    Started by ukhan1‎, 08-20-2012 08:54 PM
    • Replies: 4
    • Views: 2,039
    08-20-2012, 09:16 PM Go to last post
  10. Need a binary data with high intraclass correlation.

    Hi! for my research, in order to compare some new correlated binomial models, I need an empirical data where the binomial binary trials are highly...

    Started by arun‎, 08-20-2012 01:49 PM
    • Replies: 0
    • Views: 1,263
    08-20-2012, 01:49 PM Go to last post
  11. Criterion Validity

    Hi all, I am comparing scores from two tests (new test vs gold standard). The new test is scored as 1=initial; -2=elementary low;...

    Started by jimmypage‎, 08-19-2012 12:02 PM
    • Replies: 1
    • Views: 2,313
    08-19-2012, 05:44 PM Go to last post
  12. Random or fixed slope in hlm?

    Hello, I am doing multilevel analysis and I am not sure whether I should include a random slope or not. The Wald test produces the following...

    Started by Julie30‎, 08-17-2012 09:15 PM
    • Replies: 12
    • Views: 12,094
    08-19-2012, 03:27 PM Go to last post
  13. Statistical Theories, Methods, and Fields applying to Educational Assessment

    I'm interested in doing research in education and statistic. Particulary with student assessment and students. However, I know this is very broad and...

    Started by zaylia‎, 08-17-2012 12:52 PM
    • Replies: 4
    • Views: 1,913
    08-17-2012, 04:04 PM Go to last post
  14. Question Which tests? Clarification plz!

    Hi all! I’m currently doing some research and I’m a bit of a novice so wanted to check if I was on the right lines with the statistical tests I’m...

    Started by Pippy‎, 08-14-2012 07:58 AM
    • Replies: 2
    • Views: 1,902
    08-17-2012, 01:18 PM Go to last post
  15. Help with test interpretation

    Hi all I'm doing some research and have run a few kolmogorov- smirnov tests on my data. My question is whether the magnitude of the values have...

    Started by Shakste‎, 08-11-2012 03:46 PM
    • Replies: 2
    • Views: 1,674
    08-17-2012, 01:00 PM Go to last post
  16. Mutlivariate Analysis/Using Controls

    Disclaimer: I'm a student in the social sciences with *very* elementary training in quantitative methods. If I am testing the relationship...

    Started by SG5‎, 08-07-2012 10:49 PM
    • Replies: 7
    • Views: 1,942
    08-17-2012, 10:22 AM Go to last post
  17. Advice on specifying factors in a Permanova model - repeated measures design

    Hello all, I am new to the forum and this is my first post. I would appreacite if somebody could provide advice on the following problem: I am...

    Started by latimeria‎, 08-16-2012 07:09 PM
    • Replies: 0
    • Views: 1,609
    08-16-2012, 07:09 PM Go to last post
  18. Estimating parameters using a different method?

    Hi, I have a probability distribution which has two parameters \alpha and \beta I re-parametrized the distribution such that the new...

    Started by arun‎, 08-16-2012 02:01 AM
    • Replies: 2
    • Views: 1,114
    08-16-2012, 08:43 AM Go to last post
  19. Why does n and N values change when weighing by percent?

    I am weighting my survey during data analysis to equalize two groups within one variable. In order to get these two groups equal I weight one value...

    Started by asmith77559‎, 08-15-2012 02:43 PM
    • Replies: 0
    • Views: 1,288
    08-15-2012, 02:43 PM Go to last post
  20. Why use Chi-square?

    Hi, I am putting together a statistics course about inference techniques to use when the predictor variable(s) are categorical (by which I mean,...

    Started by Eugenie‎, 08-13-2012 09:33 AM
    chi squared, fisher exact test
    • Replies: 9
    • Views: 4,668
    08-15-2012, 01:58 PM Go to last post
  21. Parametric / Non-parametric...

    Hi Everyone, I have a dataset that looks something like this: gene1, occurence in tissue 1 / condition A, 1 / B, 1 / C, 2 / A, 2 / B, 2 C....

    Started by ohara‎, 08-15-2012 11:21 AM
    • Replies: 6
    • Views: 2,339
    08-15-2012, 01:06 PM Go to last post
  22. Which test to use / Spearman's Rank Order correlation

    I am trying to find a relationship between two firm performance scores - how board diversity score (independent variable) affects companies' social...

    Started by jamai‎, 08-14-2012 05:56 AM
    • Replies: 2
    • Views: 3,587
    08-14-2012, 09:31 AM Go to last post
  23. What is the best way to treat Autocorrelation and Heteroscedasticity problems in TS

    Hi, I am doing time-series regression. I face the problems of Heteroscedasticity and Autocorrelation as following. ...

    Started by dreamer3930‎, 08-14-2012 05:15 AM
    • Replies: 0
    • Views: 1,783
    08-14-2012, 05:15 AM Go to last post
  24. Smile Selecting the RIGHT method this analysis --->

    Any help with the following would be greatly appreciated. I have a model of the form: Y = \mu +C +X+S+e where Y is continuous and C,X and S...

    Started by loglikely‎, 07-17-2012 02:35 PM
    • Replies: 14
    • Views: 3,239
    08-13-2012, 05:17 PM Go to last post
  25. Why use Kruskal-Wallis?

    Hi, I am putting together a course on inference techniques to use when the predictor variable(s) are categorical (ie. have no meaningful order). ...

    Started by Eugenie‎, 08-13-2012 09:44 AM
    anova, bootstrapping, kruskal-wallis
    • Replies: 9
    • Views: 7,214
    08-13-2012, 03:14 PM Go to last post
  26. Mentioning that data was not randomly sampled in discussion?

    Hi there, I was just wondering whether the following is a good idea to mention in my discussion: Im investigating depression and maladaptive...

    Started by veggie‎, 08-12-2012 09:04 AM
    • Replies: 8
    • Views: 1,935
    08-13-2012, 12:58 PM Go to last post
  27. Algebra, two-sample t-statistic, variance

    Could someone help to start with the question. Question: http://s12.postimage.org/kvtyiacuj/question.png Thanks!

    Started by _joey‎, 08-06-2012 02:24 AM
    2 Pages
    1 2
    • Replies: 20
    • Views: 5,728
    08-13-2012, 12:31 AM Go to last post
  28. Statistical approach to 0 bounded skewed data?

    I'm working on a data set (neuronal spike density) that contained a lot 0 values and I am having a hard time trying to come up with a valid...

    Started by cshen28‎, 08-12-2012 11:21 PM
    • Replies: 1
    • Views: 2,335
    08-12-2012, 11:22 PM Go to last post
  29. Several nested categorical ecological variables, appropriate test?

    Hi all, this is my first post. I've looked through the FAQ and links to selecting a test, but haven't found an example of a test similar to my own. ...

    Started by grant13951‎, 08-12-2012 09:54 AM
    • Replies: 0
    • Views: 1,529
    08-12-2012, 09:54 AM Go to last post
  30. Testing affects of non-normal explanatory variables on response variable

    Hi all, I'm having real problems with analysing some data (I am using R), and wondered if anyone would please be able to offer me any advice. I...

    Started by th0506‎, 08-11-2012 05:14 PM
    independent variables, multicollinearity, non-normal distribution, non-parametric tests, transformations
    • Replies: 0
    • Views: 1,613
    08-11-2012, 05:14 PM Go to last post
  31. Help with interpreting simple chi-square!

    Hi everyone, I ran a simple experiment on whether blame for failures in relationships was seen to be internal or external, and these were the...

    Started by cassandra‎, 08-11-2012 05:54 AM
    • Replies: 2
    • Views: 2,499
    08-11-2012, 12:48 PM Go to last post
  32. Autocorrelated measurements with autocorrelated errors, covariance term

    Dear all interested stats people, I encountered the following situation for error propagation of a time series. 1.) Given a time series...

    Started by FrostR‎, 08-11-2012 07:43 AM
    • Replies: 0
    • Views: 1,490
    08-11-2012, 07:43 AM Go to last post
  33. Sampling sizes and significance

    Hi all, I got a question hoping someone can help me out. I use this site to calculate my sample sizes http://www.raosoft.com/samplesize.html ...

    Started by skip‎, 08-09-2012 11:00 PM
    • Replies: 3
    • Views: 1,976
    08-10-2012, 08:59 AM Go to last post
  34. Reliability

    How do I calculate reliability for something that I do not have an "exact" answer for? For example, in an observational setting with 2 observers...

    Started by roy‎, 08-09-2012 08:28 AM
    coefficient, correlation, reliability
    • Replies: 1
    • Views: 1,535
    08-10-2012, 08:53 AM Go to last post
  35. Post Multivariate analysis with dependent variables and replicates

    Dear All, I have been stuck in this issue for 2nd day now. I have a dataset of 13 depended variables (consequitive (not repeated!) measurment...

    Started by Bioequivalencefreak‎, 08-10-2012 05:49 AM
    dependent variables, manova, simulation
    • Replies: 0
    • Views: 1,398
    08-10-2012, 05:49 AM Go to last post
  36. Post Hoc

    If you have two groups for the I.V. (i.e. Men and Women) and one D.V. is it possible to run just a Post Hoc test? Isn't that the same as a T-test? ...

    Started by Shadow21‎, 08-08-2012 10:38 AM
    • Replies: 2
    • Views: 1,342
    08-09-2012, 10:17 PM Go to last post
  37. Using a proportion as an effect size in meta-analysis

    Hey TS, I have a question about using a proportion as an effect size in a meta-analysis. Let's say, for example, that I am interested in a...

    Started by Rhodo‎, 08-08-2012 08:43 PM
    • Replies: 1
    • Views: 2,901
    08-08-2012, 08:51 PM Go to last post
  38. Question Paired t-test using averages

    Hi, I would really appreciate if you could help me with my research design for my thesis. I am investigating a group of companies in terms of %...

    Started by l_rett01‎, 08-07-2012 05:31 PM
    design, survey weights, t-test
    • Replies: 0
    • Views: 1,489
    08-07-2012, 05:31 PM Go to last post
  39. survey weighting and calculation of confidence intervals for proportions

    Hi all I'm working with data from a one-off cross-sectional random sample survey that has weighting that can be applied to make it representative...

    Started by zingbar‎, 08-07-2012 04:20 PM
    • Replies: 0
    • Views: 3,726
    08-07-2012, 04:20 PM Go to last post
  40. Insignificant Results

    Just ran a simple regression, but got insignificant results. I know this is vague, but anyone have any idea why? Bad theory? Or something wrong in my...

    Started by Corolla‎, 08-05-2012 10:17 PM
    • Replies: 1
    • Views: 2,128
    08-05-2012, 10:33 PM Go to last post
  41. What model for small sample?

    Hi! I have 59 observations of farmers' annual net income (which is representative) and I want to see the effect of 15 independent variables, such...

    Started by Yives‎, 08-04-2012 12:32 PM
    • Replies: 2
    • Views: 1,913
    08-05-2012, 08:40 AM Go to last post
  42. Stats Analysis Question =]

    Hey Everyone, Question!: In an aged-matched experiment, I want to compare . . . . I want to test the significance of DrugY on performance of...

    Started by Cristíona‎, 08-03-2012 07:38 PM
    experiment analysis, experimental design, stats
    • Replies: 0
    • Views: 1,295
    08-03-2012, 07:38 PM Go to last post
  43. SEM - Using Subscales as Observed Variables vs. Items

    I have some data that I am want to make an SEM model out of. It isn't a very sophisticated model, basically four variables (the BIS and 3 BAS...

    Started by xralphyx‎, 08-03-2012 11:11 AM
    • Replies: 0
    • Views: 2,261
    08-03-2012, 11:11 AM Go to last post
  44. Linear mixed model analysis with unbalanced measurement time points

    I am interested in performing a linear mixed model analysis in SPSS 20.0. Specifically, I will be analyzing repeated measures data with several...

    Started by smsdegree‎, 08-03-2012 12:41 AM
    mixed model, unbalanced variables
    • Replies: 0
    • Views: 1,187
    08-03-2012, 12:41 AM Go to last post
  45. BH, why this threshold ?

    Hello, I have a theoretic question. When using the BH procedure for controlling the false discovery rate, we compare the p values in this way: ...

    Started by NN_STAT‎, 07-29-2012 09:43 AM
    • Replies: 1
    • Views: 1,433
    08-02-2012, 06:01 PM Go to last post
  46. 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: 2,037
    08-02-2012, 05:22 PM Go to last post
  47. Distribution of p values

    Hello, I need some help understanding the last stage of a proof. I am trying to understand the proof that say that the distribution of the P...

    Started by NN_STAT‎, 07-30-2012 07:46 AM
    • Replies: 4
    • Views: 5,560
    08-01-2012, 09:11 AM Go to last post
  48. Principal Component Analysis

    hi guys, sorry to bother you. would like to seek help on principal component analysis regarding the interpretation of data or on how its going...

    Started by abdul.karim‎, 03-26-2011 02:12 AM
    • Replies: 1
    • Views: 4,191
    08-01-2012, 03:32 AM Go to last post
  49. Sample Size Calculater based on a Known Population Size

    Hello all, Part of the research objectives is to achieve generalisation of the findings and extend it to the rest of organisation. To do so, I...

    Started by wickedChecky‎, 07-31-2012 03:43 PM
    • Replies: 0
    • Views: 2,844
    07-31-2012, 03:43 PM Go to last post
  50. 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: 2,287
    07-31-2012, 11:31 AM Go to last post
  51. KL Divergence - What does the double bar notation mean?

    Hi, Kullback-Leibler divergence tends to be written as D_KL(P||Q), where P is a true probability distribution of random variable x and Q is a...

    Started by davuk‎, 07-31-2012 09:41 AM
    • Replies: 0
    • Views: 1,539
    07-31-2012, 09:41 AM Go to last post
  52. Citation needed for removing 3 Stdev outliers

    Hi, In a research paper, I had remove values that were 3 standard deviations away from the mean. The values simply didn't make any sense. I have...

    Started by civiloscar‎, 07-30-2012 02:21 PM
    citation, outliers, standard deviation
    • Replies: 3
    • Views: 2,689
    07-30-2012, 04:51 PM Go to last post
  53. [SPSS] Different sig. level with Two-way ANOVA vs. Independent T-test, Help!

    Hi, I am confused right now. I am a newbie for SPSS. The sig. level in independent t-test is different from in two-way ANOVA. Why is that? My...

    Started by mentalgoatmilk‎, 07-29-2012 05:56 PM
    • Replies: 0
    • Views: 1,362
    07-29-2012, 05:56 PM Go to last post
  54. Technical name - Is this a 'multi-level model'?

    Hello. I am hoping that someone can tell me the technical name for the following type of analysis. I have a sense that it may be a 'multi-level'...

    Started by jesse‎, 07-27-2012 10:11 PM
    • Replies: 2
    • Views: 2,496
    07-28-2012, 01:15 AM Go to last post
  55. Low cronbach's alpha - any remedy?

    Hi there, I want to construct a scale of 'contacting government' based on the question 'Please indicate if in the past year you contacted govt...

    Started by jesse‎, 07-22-2012 09:43 PM
    • Replies: 8
    • Views: 33,887
    07-27-2012, 08:52 AM Go to last post
  56. Can I use a chi-square test for this 2x3 contingency table?

    Imagine I want to find out whether there are any differences between male and female participants in their pet choices, and this is my 2x3...

    Started by cidyla‎, 07-26-2012 05:17 PM
    chi-square, proportions
    • Replies: 1
    • Views: 18,935
    07-26-2012, 09:30 PM Go to last post
  57. Employee survey: how to make it more representative?

    Gentlemen, I am creating a survey to monitor employee satisfaction with their employers. I am designing a survey which contains questions...

    Started by Biersma‎, 07-26-2012 08:20 AM
    • Replies: 1
    • Views: 2,001
    07-26-2012, 10:12 AM Go to last post
  58. breaking data into training and testing (hold-out) sets

    Dear Stats Forum, I am a grad student with an introductory stats background. For my research, I'm conducting an experiment to compare the predictive...

    Started by hollywas‎, 07-21-2012 01:30 PM
    • Replies: 3
    • Views: 2,716
    07-21-2012, 04:47 PM Go to last post
  59. Looking for guidance on an experimental design

    Hey folks: I've got a question that requires a somewhat complex experimental design (nested + repeated measures) and wanted to get a few...

    Started by jbc165‎, 07-18-2012 07:46 AM
    experimental design, nested design, repeated measures
    • Replies: 5
    • Views: 1,847
    07-20-2012, 06:31 AM Go to last post
  60. Cool Statistical Analysis Plan - help!

    I'm doing a summer research project on trends of anxiety and depression. Unfortunately, my preceptor has disappeared in the meantime and I'm left to...

    Started by eaglesunrise518‎, 07-17-2012 10:13 AM
    biostatistics, chi square, linear regression, model comparison, statistical analysis
    • Replies: 0
    • Views: 1,507
    07-17-2012, 10:13 AM Go to last post

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