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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: 1,859
    10-11-2014, 01:02 PM Go to last post
  1. help calculating needed sample size

    hi im conducting a study on a certain ratio in a blood exam (lets call it X) . I aim to say that there is a certain sensitivity (let say>80%) for...

    Started by urilee‎, Today 04:22 AM
    • Replies: 0
    • Views: 41
    Today, 04:22 AM Go to last post
  2. General Term for Models with Dependend and Independend Variables

    Hi! What is the general term for models with dependend and independend variables, like regressions, generalized linear models, decision trees, and...

    Started by consuli‎, Yesterday 09:42 AM
    • Replies: 2
    • Views: 127
    Yesterday, 03:55 PM Go to last post
  3. A question regarding Cronbach's Alpha

    Hi everyone. I have been reading that Cronbach's Alpha is used when you need to test consistency of several Likert questions which all try to...

    Started by graphicsgriffin‎, 09-18-2011 07:25 AM
    • Replies: 2
    • Views: 980
    Yesterday, 03:18 PM Go to last post
  4. Comparing Likert items. What test should I use?

    Hi, We ran a small survey study (n=50) with questions on perceived value of a tool we've developed. (the participants filled in the survey after...

    Started by RDW‎, 01-23-2015 09:09 AM
    • Replies: 3
    • Views: 126
    Yesterday, 07:59 AM Go to last post
  5. Bang and Tsiatis - t-test after?

    I have a treatment group and a control group (as a result of a matched cohort). I am comparing 12 month costs for a program but since not everyone...

    Started by lancearmstrong1313‎, 01-23-2015 01:24 PM
    • Replies: 1
    • Views: 75
    01-23-2015, 02:10 PM Go to last post
  6. Test to compare difference between median value in two discrete samples

    Hi, I have two collection of ordinal samples for a discrete variable related to two administration of an experiment. Using Kolmogorov-Smirnov, I...

    Started by Vito_Mangh‎, 01-22-2015 10:59 AM
    discrete vc comparison, inference, mann-whitney test, test hypothesis, wilcoxon rank sum test
    • Replies: 1
    • Views: 97
    01-22-2015, 11:20 AM Go to last post
  7. Factor Analysis and Cronbach Alpha

    Hi, I would like to ask you about type of data which can be used for factor analysis or for control internal reliability (Cronbach Alpha). I'm...

    Started by langouste‎, 01-18-2015 04:08 PM
    • Replies: 0
    • Views: 125
    01-18-2015, 04:08 PM Go to last post
  8. Multiple choice preference experiments, analysis by Lockwood 1998 Oecoligia 116: 475-

    Anyone familiar with Lockwood's method for multiple choice significance tests using modified Hotelling T2? I'm stuck on trying to understand his...

    Started by jeff k‎, 01-14-2015 08:22 PM
    • Replies: 1
    • Views: 155
    01-16-2015, 03:05 PM Go to last post
  9. Need help with growth model

    Hi, I have a research question that I am not sure how I should answer it. I think I may have to use growth model, but not sure! I appreciate your...

    Started by anna_258‎, 01-16-2015 04:56 AM
    • Replies: 0
    • Views: 120
    01-16-2015, 04:56 AM Go to last post
  10. Propagation of Poisson Errors

    How do I combine the asymmetrical errors when I subtract my samples from the controls? I know my low counts follow a Poisson distribution and...

    Started by nbryan5‎, 01-15-2015 11:13 PM
    error propagation, poisson
    • Replies: 1
    • Views: 121
    01-15-2015, 11:27 PM Go to last post
  11. Structural Equation Modeling: When and why do you use Z-scores instead of Mean.

    Hi. Can anyone help me answer the question why some people who do SEM use z-scores as opposed to using mean scores? (articles and books are...

    Started by dmorga‎, 01-15-2015 03:13 AM
    sem, z-scores
    • Replies: 4
    • Views: 164
    01-15-2015, 11:27 AM Go to last post
  12. 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: 147
    01-15-2015, 09:16 AM Go to last post
  13. Correlation significance critical values

    I've been trying to determine the critical value for a sample size of 168 but all the tables only indicate values up to 100 (most of them). Is there...

    Started by globaljaco‎, 01-15-2015 07:50 AM
    • Replies: 1
    • Views: 122
    01-15-2015, 08:41 AM Go to last post
  14. Appropriate test for two treatment types with zero-inflated data

    Hello all, I am trying to determine if there is a difference in falcon abundance between inside a forest reserve and outside the reserve. I ran...

    Started by mbwaterdog‎, 01-14-2015 05:20 PM
    • Replies: 1
    • Views: 95
    01-14-2015, 06:48 PM Go to last post
  15. Latent indicators for SEM query

    Hello, I've recently had a paper using SEM models reviewed. In the model I had four latent variables each with >2 indicators. For each indicator...

    Started by loops22‎, 01-14-2015 10:54 AM
    • Replies: 0
    • Views: 59
    01-14-2015, 10:54 AM Go to last post
  16. risk-adjustment for patient characteristics for survey

    Hi, Does anyone have any experience conducting surveys. For some surveys in order to ensure sample characteristics is representative of...

    Started by proc1125‎, 01-13-2015 09:54 AM
    • Replies: 0
    • Views: 124
    01-13-2015, 09:54 AM Go to last post
  17. This might be a simple statistics question, or a really odd statistics question.

    I am not a statistics person, so I am not sure if this is a statistics type question or a question that has an answer. I am not sure how best to...

    Started by simpleton‎, 01-11-2015 09:58 AM
    • Replies: 3
    • Views: 242
    01-11-2015, 03:40 PM Go to last post
  18. Question Calculate Sample size using calculator ?

    Hello Can some one give me formula to calculate sample size using calculator or manually. This data I have right now: Population size = 500...

    Started by hanialbarni‎, 12-25-2014 07:01 PM
    • Replies: 4
    • Views: 431
    01-11-2015, 12:00 PM Go to last post
  19. ANOVA with post hoc

    Would this study design be sufficient? I would like to study the efficacy of countermeasure versus a polygraph: Use 30 polygraph operators, 10 of...

    Started by RMann‎, 01-11-2015 07:37 AM
    • Replies: 0
    • Views: 119
    01-11-2015, 07:37 AM Go to last post
  20. noramlization

    I weighted the variables to do structural equation modeling (SEM). I found that some weighted variables were not normally distributed. Do I have to...

    Started by eunkum‎, 01-08-2015 02:06 PM
    normalization
    • Replies: 3
    • Views: 329
    01-10-2015, 01:07 AM Go to last post
  21. Scale Issue - MANOVA vs Kruskall Wallis

    Hello, In my dissertation, I asked people in the general population to complete a battery of team process measures based on an effective team...

    Started by I-O Student‎, 01-07-2015 11:24 AM
    manova, non-parametric test, rank-order data
    • Replies: 1
    • Views: 185
    01-09-2015, 02:47 AM Go to last post
  22. Okay to Sum Numerical Values of Categorical Variables?

    Hi. I have questions regarding categorical variables. Can you create a scaled variable out of several dichotomous variables? For example if I...

    Started by Aryianna‎, 01-08-2015 12:17 AM
    analysis, categorical, dichotomous, statistics
    • Replies: 0
    • Views: 192
    01-08-2015, 12:17 AM Go to last post
  23. Pseudoreplication for my PhD Thesis: any advices?

    Hello to everybody, that's my first post in the forum. :wave: I apologize for i) my bad english and ii) for the lenght of the post :rolleyes: ...

    Started by Muzzé‎, 12-27-2014 04:26 AM
    • Replies: 3
    • Views: 586
    01-04-2015, 09:06 PM Go to last post
  24. Ms

    I am doing a research on Consumer attitude regarding Eco-friendly FMCG. My hypothesis is" There is no relationship between key variables of green...

    Started by SudhaSharma‎, 01-04-2015 11:43 AM
    • Replies: 1
    • Views: 226
    01-04-2015, 11:56 AM Go to last post
  25. Multifactorial analysis with R integrated TIME

    Hi! I'm about to analyze data using a multifactorial analysis with the R (Rcmdr) software and I'm not too sure on how to organize the factor groups....

    Started by cha‎, 12-22-2014 05:28 AM
    multifactorial analysis, time
    • Replies: 0
    • Views: 264
    12-22-2014, 05:28 AM Go to last post
  26. bounded pareto distribution

    please any one can help me about the inversion method that is used to form a bounded pareto I can't understand the inversion method that is used in...

    Started by batooool‎, 12-17-2014 09:49 AM
    • Replies: 1
    • Views: 286
    12-20-2014, 04:25 PM Go to last post
  27. Colculation Geometric Brownian Motion with deposits.

    Hi all. There is a way of colculation a future standart diviation of a portfolio if you know the daily standart diviation and the mean. ...

    Started by borislivs‎, 12-20-2014 03:00 PM
    • Replies: 1
    • Views: 143
    12-20-2014, 04:15 PM Go to last post
  28. How to alculate cross loadings of each item in SPSS ?

    Hello Can someone give me the way to do it in SPSS

    Started by hanialbarni‎, 12-20-2014 12:04 AM
    • Replies: 0
    • Views: 159
    12-20-2014, 12:04 AM Go to last post
  29. Calculating the standard error of an odds ratio from the standard errors of 2 logits

    I've just completed a logistic regression model with a continuous covariate, and calculated the logit and standard errors using SAS for creating a...

    Started by Disvengeance‎, 12-13-2014 09:53 PM
    3 Pages
    1 2 3
    • Replies: 35
    • Views: 1,111
    12-18-2014, 10:02 PM Go to last post
  30. How to do a Validation Study?

    My professor has asked me to do a validation study but I have never done one before and don't know what methodology or statistics to use. Basically...

    Started by amber82‎, 12-16-2014 11:44 PM
    methodology, scales, validate scale, validation
    • Replies: 1
    • Views: 186
    12-17-2014, 01:05 AM Go to last post
  31. Mediation Analysis with Categorical IV with 4 levels

    Hello all, I would like to do a mediation analysis using the following 3 variables: 1. Integration Strategy: This is the independent variable. It...

    Started by tez_s‎, 08-15-2012 08:20 AM
    dummy coding, mediation analysis, regression
    • Replies: 4
    • Views: 2,806
    12-16-2014, 08:27 PM Go to last post
  32. Marble-bag Memory Model in Behaviour Science

    I hope this is an acceptable forum for this. I have searched back to 2010 on the term 'geometric' without an answer. I'm trying to assist a...

    Started by pmcgee‎, 12-16-2014 07:35 PM
    • Replies: 0
    • Views: 146
    12-16-2014, 07:35 PM Go to last post
  33. Nonparametric methods

    If I have a sample with the size of the right and left arms of each of these people.So I have two dependent groups, since these are the same person,...

    Started by askazy‎, 12-12-2014 01:28 PM
    • Replies: 10
    • Views: 409
    12-16-2014, 06:30 AM Go to last post
  34. Question How can i check from this table if data normally distrubtion or not ?

    Hello How can I check from this output if data normally distribution or not ?

    Started by hanialbarni‎, 12-13-2014 02:04 AM
    • Replies: 1
    • Views: 244
    12-15-2014, 07:56 AM Go to last post
  35. Is this method to post-hoc determine the sample size a known one?

    Hi all! In the last weeks I'm facing the issue of determining if my sample is big enough to describe the world population. Apart from the usual...

    Started by ale_tuz‎, 05-05-2014 03:39 AM
    • Replies: 3
    • Views: 389
    12-12-2014, 08:16 AM Go to last post
  36. missing variable

    Items include the scale of 0 (Does not apply or not used) to 3 (Used a great deal). I want to combine several items to make one scale. I assigned a...

    Started by eunkum‎, 12-10-2014 03:14 PM
    missing varible
    • Replies: 0
    • Views: 201
    12-10-2014, 03:14 PM Go to last post
  37. Question randomisation - lack of replicates

    Dear all, I have question concerning statistical tests to compare 2 datasets without replicas. i will explain my problem into more detail: I...

    Started by mrtwino‎, 12-10-2014 04:02 AM
    • Replies: 0
    • Views: 154
    12-10-2014, 04:02 AM Go to last post
  38. Static simultaneous contingency model to dynamic simultaneous equations model

    Dear forum members, I have a task never attempted before and need some help. Given is a simultaneous contingency model in the following...

    Started by kiton‎, 12-05-2014 07:14 PM
    • Replies: 1
    • Views: 204
    12-09-2014, 03:59 PM Go to last post
  39. 3 way ANOVA with repeated measures... Data entry setup for statistica

    Hello all; I am doing a preliminary analysis on some data using STATISTCA, however being new to the software I am having a real difficult time...

    Started by rms5413‎, 05-22-2014 11:28 PM
    • Replies: 1
    • Views: 369
    12-09-2014, 02:24 PM Go to last post
  40. The appropriate form of analysis / technique and terms?

    My assignment is to do the give the appropriate form of analysis / technique or term for a list of scenarios. I am lost on a few and would...

    Started by I'm-your-0‎, 12-08-2014 01:15 PM
    psych, psychology statistics, stats
    • Replies: 1
    • Views: 301
    12-08-2014, 01:45 PM Go to last post
  41. What Analysis tools should I use in SPSS?

    I am trying to work through some research issues and NOT a stats major. I have all the data and using SPSS. My research question is to determine...

    Started by henni8a5‎, 12-06-2014 07:53 PM
    • Replies: 1
    • Views: 271
    12-08-2014, 03:04 AM Go to last post
  42. Raking ratio estimation - choice of counts?

    I am trying to use a raking ratio estimation in some survey analysis. I have three variables that I'll be using - variable 1 and variable 2 (both...

    Started by numbercrunching2014‎, 12-07-2014 03:07 PM
    • Replies: 0
    • Views: 200
    12-07-2014, 03:07 PM Go to last post
  43. 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: 347
    12-06-2014, 11:01 AM Go to last post
  44. Testing relatedness, correlation test?

    I am looking for relationships in my data. But the more I've been thinking and reading, the more confused I am getting. So I'd kindly ask your POV. ...

    Started by Xbar‎, 12-05-2014 07:38 AM
    • Replies: 0
    • Views: 151
    12-05-2014, 07:38 AM Go to last post
  45. 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: 467
    12-03-2014, 05:38 AM Go to last post
  46. sample size calculation for surveys

    Hi, I am wondering if anyone knows how the sample size for HCAHPS mode study completed in 2007...

    Started by proc1125‎, 12-02-2014 02:07 PM
    • Replies: 0
    • Views: 176
    12-02-2014, 02:07 PM Go to last post
  47. 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: 330
    12-01-2014, 11:49 PM Go to last post
  48. RM ANOVA multivariate significance

    Hello, I recently did a RM ANOVA on some of my data, but I found something strange. The multivariate test was significant, but the univariate was...

    Started by kuraikawa‎, 11-30-2014 01:30 PM
    • Replies: 0
    • Views: 132
    11-30-2014, 01:30 PM Go to last post
  49. T Test

    I am trying to do a weighted mean ttest. The statistics I'm using are the vote shares for republican and democrat women candidates in primary...

    Started by fireball‎, 11-29-2014 09:29 PM
    • Replies: 1
    • Views: 279
    11-30-2014, 07:01 AM Go to last post
  50. 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: 11
    • Views: 620
    11-30-2014, 03:42 AM Go to last post
  51. 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: 763
    11-28-2014, 08:13 PM Go to last post
  52. 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: 310
    11-25-2014, 04:53 PM Go to last post
  53. 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: 210
    11-24-2014, 11:17 AM Go to last post
  54. 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: 227
    11-22-2014, 08:10 AM Go to last post
  55. 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: 188
    11-21-2014, 12:08 AM Go to last post
  56. 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: 294
    11-20-2014, 09:10 PM Go to last post
  57. 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: 212
    11-20-2014, 04:25 AM Go to last post
  58. 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: 210
    11-19-2014, 10:43 AM Go to last post
  59. 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: 438
    11-18-2014, 06:03 PM Go to last post
  60. 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: 479
    11-18-2014, 05:22 PM Go to last post

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