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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: 1,490
    10-11-2014, 01:02 PM Go to last post
  1. What's the correct correction factor? Multiple one-sample and paired tests...

    This question concerns the chance of Type I error in hypothesis testing with multiple statistical tests. The data come from a series of experiments....

    Started by 5tudent‎, 11-21-2014 06:15 PM
    bonferroni, correction, familywise, pairwise, t-test
    • Replies: 6
    • Views: 416
    Yesterday, 08:13 PM Go to last post
  2. Red face Sample Size Calculation

    Hello all, I just recently came across this website and was hoping an intelligent mind could help me calculate the sample size required for a...

    Started by Chimpdaddy‎, 11-25-2014 04:05 AM
    • Replies: 1
    • Views: 168
    11-25-2014, 04:53 PM Go to last post
  3. Post Best factor analysis settings in SPSS ?

    Hello Where i can get the best setting for factor analysis in spss for descriptives, extractions, rotations, scores, and options. I dont mind...

    Started by hanialbarni‎, 11-24-2014 06:31 AM
    • Replies: 1
    • Views: 112
    11-24-2014, 11:17 AM Go to last post
  4. Post Estimation Shrinkage Regression Coefficients

    Hey all, I am reading about shrinkage estimators. I am sure most of you are familiar with the concept. In any case, I start with a brief...

    Started by ledzep‎, 11-22-2014 05:37 AM
    • Replies: 1
    • Views: 123
    11-22-2014, 08:10 AM Go to last post
  5. Small difference but still significant?

    I hae sample size of 67 participants. They took a pre and post knowledge survey. The maximum score was 14 answers correct. I run a pair ttest. These...

    Started by Marvin85‎, 11-10-2014 02:38 PM
    pvalue, significant
    • Replies: 10
    • Views: 419
    11-21-2014, 10:17 PM Go to last post
  6. Question How do I determine best choice based on confidence values?

    I have this problem I don't know how to solve. I have X variables. One of them is a key value. I have different data sets, each containing rows of...

    Started by genesis‎, 11-21-2014 12:08 AM
    • Replies: 0
    • Views: 115
    11-21-2014, 12:08 AM Go to last post
  7. Post What should i do after factor analysis output ?

    Hello, I am having a construct name trust that includes the following constructs: 1 - Benevolence ( 3 Items) 2 - Integrity ( 6 Items ) 3 -...

    Started by hanialbarni‎, 11-19-2014 10:11 AM
    • Replies: 3
    • Views: 168
    11-20-2014, 09:10 PM Go to last post
  8. Factor Analyzing Price Time Series

    Hi I have a question regarding using factor analysis for price time series (specifically, online advertising prices of various versions of ads). ...

    Started by ssbk‎, 11-20-2014 04:25 AM
    factor analysis, price testing, principal component, principal components
    • Replies: 0
    • Views: 122
    11-20-2014, 04:25 AM Go to last post
  9. statistical analysis at the regional level

    Hi I wanted to run multivariate analysis on data from regional level (i.e. regional population size, regional indicator values, regional equity...

    Started by proc1125‎, 11-18-2014 01:31 PM
    • Replies: 3
    • Views: 145
    11-19-2014, 10:43 AM Go to last post
  10. Statistical analysis of longitudinal data using multi-level model?

    Hello! This is my first post, I'm just wondering if I can use this approach? I want to research the opinion of 8 countries(data is a proportion),...

    Started by Talik‎, 11-14-2014 05:48 PM
    • Replies: 4
    • Views: 282
    11-18-2014, 06:03 PM Go to last post
  11. Basic ANOVA question

    We had individuals fill out a survey where they assign importance to five categories. So for example: if given $1000 to distribute among five...

    Started by singerjr‎, 11-18-2014 09:05 AM
    • Replies: 6
    • Views: 184
    11-18-2014, 05:22 PM Go to last post
  12. dealing with unequal sample sizes... can anyone help please?

    Hello, I am comparing men and women on outcomes of their diagnostic assessment (autism). there are approx 600 men and 200 women. I have used...

    Started by ellie_w‎, 11-17-2014 10:10 AM
    representativeness, unequal sample sizes
    • Replies: 7
    • Views: 251
    11-18-2014, 04:14 AM Go to last post
  13. Post How to test data if it is normal distribution in spss ?

    Hello Good morning guys i will need some help truly i have variables in spss most of them scale type, some of them are nominal, and few are...

    Started by hanialbarni‎, 11-12-2014 11:29 PM
    distribution, graph, normal, problem formulation, spss
    • Replies: 6
    • Views: 303
    11-18-2014, 03:01 AM Go to last post
  14. 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: 294
    11-17-2014, 03:53 PM Go to last post
  15. 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: 294
    11-16-2014, 01:09 PM Go to last post
  16. Looking to hire freelance statistician

    I'm sorry if this isn't the right thread to post this question, but here goes. I'm looking for a statistician to do some freelance work, but I'm...

    Started by jonmrich‎, 11-13-2014 11:05 AM
    freelance
    • Replies: 8
    • Views: 219
    11-13-2014, 01:07 PM Go to last post
  17. HLM or MANOVA/MANCOVA

    Hello, For my study, I will use a data set that includes 22 schools, 2 to 20 teachers in each school, and 4 students from each teachers'...

    Started by HHH‎, 11-11-2014 10:27 AM
    • Replies: 0
    • Views: 163
    11-11-2014, 10:27 AM Go to last post
  18. Likert Analysis

    Hi all, I'm doing some analysis of survey data for a research project. On the broadest level, I have data from art teachers about all sorts of...

    Started by scottwc‎, 11-09-2014 07:20 PM
    • Replies: 1
    • Views: 198
    11-10-2014, 03:16 AM Go to last post
  19. Assumptions of statistic models

    I was watching (https://www.youtube.com/watch?v=8SGif63VW6E) and he said a statement that made me think: 8SGif63VW6E#t=134 I asked for...

    Started by trinker‎, 11-07-2014 05:20 PM
    assumptions
    • Replies: 1
    • Views: 182
    11-07-2014, 06:34 PM Go to last post
  20. Repeated measures data

    Hello I want to test the significance between the treatments on repeated measures. I have the 3 groups A, B and C and response for them was...

    Started by rzs0034‎, 11-04-2014 07:52 PM
    • Replies: 4
    • Views: 255
    11-07-2014, 02:35 AM Go to last post
  21. Steel dwass vs. wilcoxon each pair

    Hello Wilcoxon each pair vs. Steel dwass non parmaetric multiple comparison test in JMP. Which one is more powerful and why? I would really...

    Started by rzs0034‎, 11-06-2014 07:00 PM
    • Replies: 0
    • Views: 112
    11-06-2014, 07:00 PM Go to last post
  22. generate constrained combinations

    I have some vectors like this V1= V2= V3= V4= I would like to get all possible combinations from these vectors that look like this ,V2,V3,v4]...

    Started by kjohn‎, 11-05-2014 05:14 PM
    combinations, constraints
    • Replies: 0
    • Views: 156
    11-05-2014, 05:14 PM Go to last post
  23. Compare type of procedure with an outcome - which analysis is best?

    Good morning, I'm writing a medical meta-analysis, and I need help with a part of the statistical analysis. I gathered articles from various...

    Started by giuly_gt‎, 11-05-2014 08:55 AM
    • Replies: 0
    • Views: 156
    11-05-2014, 08:55 AM Go to last post
  24. Which analyzing technique?

    Im currently working on my thesis and I wonder which analysis technique to use. I have 2 dependent variables: voting choice (1 exwtreme left,...

    Started by Annvdb‎, 11-05-2014 04:13 AM
    logistic regression, multinomial regression
    • Replies: 0
    • Views: 162
    11-05-2014, 04:13 AM Go to last post
  25. Modified bland Altman- plotting difference aganst the criterion measure

    Hi all, I am measuring the agreement between a movement sensor that estimates VO2 in humans during exercise and criterion VO2. My supervisor advised...

    Started by FightingBull‎, 11-01-2014 09:05 AM
    agreement, altman, bland
    • Replies: 0
    • Views: 205
    11-01-2014, 09:05 AM Go to last post
  26. Tukey kramer

    Hello I am applying Tukey Kramer on a data problem. Actually, there are 5 treatments that i want to compare and 1 is control. Out of 5...

    Started by rzs0034‎, 10-30-2014 06:17 PM
    tukey kramer
    • Replies: 0
    • Views: 203
    10-30-2014, 06:17 PM Go to last post
  27. Statistical analysis of variable data

    Hello I have the statistical research data. I have 6 treatments with 3 boxes for each treatment. I am raining on the treatments every week and...

    Started by rzs0034‎, 10-30-2014 04:31 PM
    • Replies: 0
    • Views: 205
    10-30-2014, 04:31 PM Go to last post
  28. Correct measure of central tendency for Skewed distribution

    Dear Talk Stats users, I am trying to solve following problem. I've got a data, which has a skewed distriubution (see attachment ) Now I can...

    Started by Namba‎, 10-30-2014 07:33 AM
    • Replies: 6
    • Views: 230
    10-30-2014, 12:26 PM Go to last post
  29. Generalized estimating equations and multiple imputation

    Hi, I'm running a Generalized estimating equation model with multiple imputed data but I can not get a pooled outcome. Do anyone have a solution to...

    Started by Ulrik‎, 10-29-2014 04:54 AM
    gee multiple imputation
    • Replies: 4
    • Views: 224
    10-29-2014, 04:06 PM Go to last post
  30. How well a few values fit a given distribution?

    Dear all, I have approximated two one-dimensional random variables A and B using Gaussian Mixture Models (3 gaussians). I used...

    Started by eelioss‎, 10-24-2014 10:28 AM
    • Replies: 1
    • Views: 244
    10-28-2014, 05:56 AM Go to last post
  31. Do you like this measure for status inconsistency?

    For my thesis I have a variable named 'status inconsistency', so I want to compare people whose income or profession doesnt allign with their...

    Started by Annvdb‎, 10-28-2014 01:35 AM
    spss, status inconsistency
    • Replies: 0
    • Views: 136
    10-28-2014, 01:35 AM Go to last post
  32. Chi-square influential categories

    I have counts of events in a number of categories and an a priori expected frequency for those events. Clearly, this is a standard chi-squared. ...

    Started by bioniclime‎, 10-27-2014 01:05 PM
    chi-square test, influence
    • Replies: 3
    • Views: 184
    10-27-2014, 04:55 PM Go to last post
  33. Question Are they misunderstanding ANOVAs here?

    Hi, Here's an extract from a paper I'm using in a systematic review: The mean GAD-7 score of the sample prior to the course was 10.98 (SD 5.17,...

    Started by fishfishfish3‎, 10-23-2014 12:56 PM
    anova, post hoc
    • Replies: 8
    • Views: 335
    10-24-2014, 12:22 PM Go to last post
  34. Repeated measures ANOVA vs. Mixed Models

    Hi, I'm trying to analyze the results of my Master Thesis with SPSS. I've 3 experimental conditions (factor: Group) and for variable A every...

    Started by Lullabi_8888‎, 10-24-2014 04:38 AM
    mixed models, repeated measure anova
    • Replies: 0
    • Views: 175
    10-24-2014, 04:38 AM Go to last post
  35. Data analysis : replication and pseudoreplication

    I have several questions concerning analysis of data, especially when there are replications and/or pseudoreplications. First, I read an example...

    Started by statah‎, 10-23-2014 09:41 PM
    • Replies: 0
    • Views: 166
    10-23-2014, 09:41 PM Go to last post
  36. I need to test within and between factors at the same time. Which test should I use?

    Hi everyone, I'm trying to analyze the results of my Master Thesis with SPSS. I've 3 experimental conditions (factor: Group) and every subject in...

    Started by Lullabi_8888‎, 10-23-2014 04:31 PM
    non-parametric anova, repeated measure anova
    • Replies: 0
    • Views: 166
    10-23-2014, 04:31 PM Go to last post
  37. Can anyone help me choose appropriate form(s) of analysis?

    Hi, I was wondering if anyone could possibly help advise me on choosing an appropriate form of analysis I have 2 groups of participants....

    Started by Kenny‎, 10-19-2014 01:05 PM
    • Replies: 6
    • Views: 404
    10-23-2014, 04:35 AM Go to last post
  38. item-scale correlation

    Hi, When running an item-scale correlation, what does it mean when research have corrected for overlap? Is there a way to do this in SAS?

    Started by proc1125‎, 10-02-2014 05:49 PM
    • Replies: 13
    • Views: 633
    10-21-2014, 01:19 PM Go to last post
  39. Which regression model should I apply?

    Dear all, I want to do an empirical analysis on the risk-return characteristics of venture capital investments across industries applying a...

    Started by rüdiwörns‎, 10-18-2014 03:21 AM
    cox regression, model, regression, venture capital
    • Replies: 0
    • Views: 230
    10-18-2014, 03:21 AM Go to last post
  40. paired sample t-test vs. repeated measures ANOVA

    I think that the Psychology Research forum is more appropriate so I moved my question there--I could not figure out how to delete this thread. Thank...

    Started by jmmu‎, 10-17-2014 09:03 PM
    anova, repeated measures anova, t-test
    • Replies: 0
    • Views: 218
    10-17-2014, 09:03 PM Go to last post
  41. error propagation

    I have a point estimate of quantity 'A' and an associated standard error. If I calculate a new quantity (= ln-transformed 'A' multiplied by a...

    Started by JFS‎, 10-15-2014 02:09 PM
    log transformation, standard error
    • Replies: 0
    • Views: 298
    10-15-2014, 02:09 PM Go to last post
  42. Which stats test should I use?

    Hi, I have a question regarding which stats test to use. I want to look at the relationship between attitudes and satisfaction controlling for...

    Started by pero93af‎, 10-15-2014 09:13 AM
    • Replies: 1
    • Views: 197
    10-15-2014, 10:36 AM Go to last post
  43. Possible stats tests to use?

    Hi, After racking my brain not knowing what to do with my data I thought I'd give it a shot and post here, as I'm still unsure what I can do to...

    Started by Seethelios‎, 10-12-2014 06:50 PM
    biology, lifespan, movement, non-parameteric, survival
    • Replies: 1
    • Views: 501
    10-13-2014, 06:19 AM Go to last post
  44. Unhappy MBE, RMSE of two series of data, correlation.

    I have a series of Data generated as output of a mathematical model which I already know the MBE and RMSE (real measured values and simulated ones by...

    Started by bpivotto‎, 10-10-2014 08:10 AM
    correlation analysis, mbe, rmse
    • Replies: 1
    • Views: 337
    10-10-2014, 08:10 AM Go to last post
  45. Question Control Range - Specify appropriate terminology

    The measurement of a parameter have been assigned to fall within a certain range, say 40 to 80. We call this the control range. If a measurement is...

    Started by scantor1451‎, 10-08-2014 07:30 AM
    • Replies: 0
    • Views: 171
    10-08-2014, 07:30 AM Go to last post
  46. cronbach alpha for missing data

    Hi, I have an indicator which consists of questions 24, 25, 27, 29, 30, 31, and 32. I am in the middle of determining internal consistency and...

    Started by proc1125‎, 10-07-2014 07:25 PM
    • Replies: 0
    • Views: 210
    10-07-2014, 07:25 PM Go to last post
  47. p-value and estimation of parameters with non linear least squares

    Hi I am performing an estimation of some parameters . I Have the next data: age force_of Mortality(x) 49 0.00549 51 0.00509 52 0.00630...

    Started by sanmath‎, 10-07-2014 10:33 AM
    • Replies: 0
    • Views: 248
    10-07-2014, 10:33 AM Go to last post
  48. Standard Errors of Random Error

    Asking for help regarding Random errors Given that my model entails Ui which follows Normal (0, u^2), I ran SAS to estimate the random error (u^2)...

    Started by sk6398‎, 10-07-2014 04:31 AM
    random error, standard error
    • Replies: 0
    • Views: 188
    10-07-2014, 04:31 AM Go to last post
  49. 3x3 factorial design, repeated outcome measure

    I have a 3x3 factorial design (3 levels of treatment and 3 different environments) - the outcome is a repeated measurement taken at every week - the...

    Started by oncearunner‎, 10-06-2014 06:29 PM
    • Replies: 1
    • Views: 232
    10-07-2014, 03:53 AM Go to last post
  50. Relative Risk calculation

    Hi bit of help would be much appreciated for what is probably a bit of a silly question. I am trying to calculate relative risks of an adverse...

    Started by asaleh‎, 09-29-2014 07:27 AM
    • Replies: 6
    • Views: 402
    10-06-2014, 05:41 PM Go to last post
  51. Seek help to test my hypotheses (SEM)

    Hello. Hope im in the right place. i have a project that i shall submit soon. and this is the first time that i make such a research. in the...

    Started by rawanassaf‎, 10-06-2014 10:12 AM
    • Replies: 0
    • Views: 204
    10-06-2014, 10:12 AM Go to last post
  52. Interpreting continuous-dummy variable interactions

    Hi everyone, I just want to understand definitively how to interpret coefficients on continuous variable-dummyvariable interaction terms. Say my...

    Started by jfclogston‎, 10-05-2014 01:04 PM
    • Replies: 0
    • Views: 188
    10-05-2014, 01:04 PM Go to last post
  53. is validation really required

    I have time series data of about 150 sample and 8 variables. It is used to generate a interaction network, whose exact structure is not known yet. ...

    Started by ice‎, 09-29-2014 03:39 PM
    • Replies: 0
    • Views: 192
    09-29-2014, 03:39 PM Go to last post
  54. calculating sample size for multi-stage or multiphase experiment

    Hi everyone, I am running into a problem that I'm not sure how to solve. Due to budget constraints, we have 5 companies that are willing to...

    Started by proc1125‎, 09-29-2014 03:02 PM
    • Replies: 0
    • Views: 200
    09-29-2014, 03:02 PM Go to last post
  55. Multivariate nonparametric comparison

    I want to test whether two objects are similar or not. I have multivariate samples like this: Object1: X1, Y1, Z1, etc. Object2: X2, Y2, Z2,...

    Started by pkt‎, 09-29-2014 04:22 AM
    multivariate, nonparametric
    • Replies: 0
    • Views: 160
    09-29-2014, 04:22 AM Go to last post
  56. Random survey for crowd-sourcing similarities

    Hi all I have a data set of around 5,000 items that I need to test how similar or dissimilar people see each item as being from each other. In...

    Started by pwiseman001‎, 09-27-2014 12:38 AM
    crowd-sourcing, random, survey design
    • Replies: 0
    • Views: 215
    09-27-2014, 12:38 AM Go to last post
  57. panel data correlation

    I am working on paneldata (xtset firm date). Before starting my regression analyses, I want to construct a Pearson Correlation Matrix between the...

    Started by Dokla‎, 09-25-2014 05:48 AM
    • Replies: 0
    • Views: 242
    09-25-2014, 05:48 AM Go to last post
  58. Correlation between non-independent variables

    Hi, I want to conduct correlation between two variables, that have common term (difference scores). Originally there are three variables X, Y,...

    Started by random_guest‎, 09-17-2014 07:14 PM
    • Replies: 6
    • Views: 444
    09-24-2014, 12:15 PM Go to last post
  59. non parametric multiple comparison

    Hello I am doing statistical analysis on my research data and the data is not normal. So I used Kruskal Wallis test for finding whether treatments...

    Started by rzs0034‎, 09-22-2014 12:08 PM
    • Replies: 3
    • Views: 289
    09-23-2014, 02:27 AM Go to last post
  60. Question Longitudinal weighting

    Hi all. Wish you all well. I have to do weighting for an alcohol longitudinal study(2011-2013). How do I go about getting the final weights? ...

    Started by kcwong5‎, 09-23-2014 01:30 AM
    longitudinal, weighting
    • Replies: 0
    • Views: 139
    09-23-2014, 01:30 AM Go to last post

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