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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: 18,765
    10-11-2014, 12:02 PM Go to last post
  1. Post What experimental design would be most appropriate?

    In my study I have two study groups: Group A is composed of X subjects which are either males or females, and every subject is characterized by...

    Started by sylnyapi‎, 11-11-2016 03:40 PM
    • Replies: 0
    • Views: 2,568
    11-11-2016, 03:40 PM Go to last post
  2. 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: 2,634
    11-14-2016, 03:21 AM Go to last post
  3. Question research statistics (really stuck)

    -------------------------------------------------------------------------------- This is a question pertaining to a real-life data analysis. It is...

    Started by Jack Florence‎, 11-14-2016 04:21 PM
    • Replies: 0
    • Views: 3,358
    11-14-2016, 04:21 PM Go to last post
  4. multivariate regression problem - correlated residuals

    this question asks for help for a statistical/econometric problem I can't get the clue: I have a classic multivariate regression problem, i.e....

    Started by Valeria Azarova‎, 11-15-2016 06:12 AM
    multivariate-regression, residuals, stata
    • Replies: 0
    • Views: 2,421
    11-15-2016, 06:12 AM Go to last post
  5. ROC Curves

    Good Morning, I have a problem that may perhaps be very simple, but I keep getting very stuck and very frustrated. I'm trying to produce ROC...

    Started by SiobhanRoisin‎, 11-18-2016 04:13 AM
    false positive rate, roc curves, true negative
    • Replies: 0
    • Views: 2,495
    11-18-2016, 04:13 AM Go to last post
  6. Sample size estimation for multinomial autocorrelated data

    I'm trying to work out the minimum sample size needed to accurately characterise land cover data. The idea is to set out the a number of quadrats...

    Started by killbot2000‎, 11-18-2016 06:28 AM
    autocorrelation, multinomial, sample size, spatial
    • Replies: 0
    • Views: 2,388
    11-18-2016, 06:28 AM Go to last post
  7. Testing Historical Data

    Hello Folks, I have 5 years of data on GPA, credit completions etc. and several categorical variables ( ex. gender, ethnicity, age). I have tried...

    Started by Ana_Res‎, 11-18-2016 03:18 PM
    • Replies: 0
    • Views: 2,343
    11-18-2016, 03:18 PM Go to last post
  8. it is must to include include ANOVA results in specified format

    Hi. My thesis has calculations that uses one-way ANOVA.There are 40 dependent variables which are needed to be compared under 14 independent...

    Started by addikted‎, 11-19-2016 03:19 AM
    • Replies: 0
    • Views: 3,464
    11-19-2016, 03:19 AM Go to last post
  9. Choosing bachelor's thesis topic

    Hello everyone. I am going to make research on statistics/data analysis for my bachelor's thesis. What are the popular areas of research in...

    Started by nail-uwec‎, 11-19-2016 09:49 AM
    • Replies: 0
    • Views: 3,069
    11-19-2016, 09:49 AM Go to last post
  10. Stuck on Battle Plan for analysis

    Hello, Currently I am looking for some advice regarding my research. Previous research has shown that Construct 1 and Construct 2 are both...

    Started by Mathis-Dantes‎, 11-20-2016 03:19 PM
    • Replies: 1
    • Views: 2,517
    11-21-2016, 03:10 AM Go to last post
  11. Data analysis

    Hi, please can someone help me out. I would like to know if I have performed the correct analysis for my study. I am comparing direct response...

    Started by Hafsah‎, 11-21-2016 01:51 PM
    • Replies: 0
    • Views: 3,336
    11-21-2016, 01:51 PM Go to last post
  12. GAMs: test of simple effects following a significant interaction

    Hello, I am a novice in Generalized Additive Models (GAMs) and I would need some advice on these models. From capture data, I would like to...

    Started by MarineRegis‎, 11-22-2016 01:44 PM
    gam model, interaction term
    • Replies: 0
    • Views: 2,936
    11-22-2016, 01:44 PM Go to last post
  13. 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: 3,167
    11-22-2016, 02:02 PM Go to last post
  14. sure independence screening in clustering

    ------------

    Started by Amir91‎, 11-22-2016 02:39 AM
    clustering, screening
    • Replies: 3
    • Views: 3,064
    11-23-2016, 01:01 AM Go to last post
  15. How to deal with unknown distribution?

    I have a game with two players. Player 1's type is publicly known, while player 2's type is unknown (privately known to him) and distributed, say,...

    Started by Vova‎, 11-24-2016 03:31 PM
    • Replies: 0
    • Views: 3,336
    11-24-2016, 03:31 PM Go to last post
  16. How can I statistically prove which data is more reliable

    We have a task to statistically identify which data set is more reliable among the two sources. Case background: Design function releases drawings...

    Started by Bhaskar‎, 11-26-2016 12:56 AM
    • Replies: 0
    • Views: 2,546
    11-26-2016, 12:56 AM Go to last post
  17. which statistic analysis-percentage frequency data-protocol analysis

    I have done a research with designers. I collect the data from every one separately through protocol analysis. I want to find the association...

    Started by Elaheh‎, 11-30-2016 11:35 AM
    • Replies: 0
    • Views: 3,163
    11-30-2016, 11:35 AM Go to last post
  18. Estimated Parameter as Dependent Variable

    Hi, Would anybody be able to help me with the following problem? That would be great!! :) In my analysis I follow a two-step approach. In the...

    Started by Maya_L‎, 12-01-2016 02:06 PM
    bootstraping, error term, estimated parameter
    • Replies: 2
    • Views: 3,106
    12-01-2016, 02:37 PM Go to last post
  19. 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: 3,597
    12-05-2016, 03:20 PM Go to last post
  20. Poisson point process

    I came across this in a network model: Distribute N points according to a homogeneous Poisson point process in a two-dimensional space of unit...

    Started by spinningfeather‎, 12-06-2016 02:24 PM
    • Replies: 0
    • Views: 2,696
    12-06-2016, 02:24 PM Go to last post
  21. S-shapec urve goodness of fit

    hi, I'm looking for a statistical test to prove (statistically) that the cumulative curve is S-shape When I try to look for answer I get 2...

    Started by atlasm‎, 12-07-2016 01:44 AM
    data, s-shape, test of significance
    • Replies: 0
    • Views: 2,701
    12-07-2016, 01:44 AM Go to last post
  22. Probability of Events in Equations

    Hello, This may be an easy question, but I would like to know how to incorporate the probability of an event in a linear (or non linear)...

    Started by mjgarrin‎, 12-09-2016 09:20 AM
    • Replies: 3
    • Views: 3,730
    12-12-2016, 09:48 AM Go to last post
  23. Question How to analyze two opposing sides survey results?

    Hi! I am doing a research between two b2b sides that are cooperating. I have already made one survey and about to do the other. The point is to...

    Started by tehnik‎, 11-13-2016 01:31 PM
    • Replies: 2
    • Views: 3,328
    12-12-2016, 12:15 PM Go to last post
  24. Question Likert scale in SPSS

    Hello, Iíve got an research assignment to do by means of questionnaire. Iíve got some basic info (gender, education level, etc) and then Iíve got 9...

    Started by afronef‎, 12-13-2016 06:49 AM
    • Replies: 1
    • Views: 2,637
    12-13-2016, 08:11 AM Go to last post
  25. Sample Size Help for Observation Study

    I wanted to calculate sample size for a single group, observational study. I'll be using a questionnaire to predict outcome (i.e. score on another...

    Started by murphy‎, 12-15-2016 11:36 PM
    • Replies: 4
    • Views: 3,143
    12-16-2016, 10:29 AM Go to last post
  26. Repeated k-fold Cross-Validation

    I saw this: "Any advices on practice? It depends on the data, but it's common to find examples cases 10 fold CV, plus repetition: 10 fold CV,...

    Started by hlsmith‎, 12-09-2016 02:49 PM
    • Replies: 12
    • Views: 7,175
    12-16-2016, 10:35 AM Go to last post
  27. One Sample T-Test with Likert Scale Questionnaire

    Hi all, I am doing a research and will study the how user think about shopping online. In my questionnaire, I have 3 questions - using Likert...

    Started by kenzq‎, 04-17-2009 03:08 AM
    • Replies: 8
    • Views: 66,585
    12-17-2016, 02:18 AM Go to last post
  28. Structured Modeling or Multiple Models?

    We conducted a study in order to determine the factors that influenced turtle nest site selection. We collected various environmental variables from...

    Started by Ruthere‎, 12-20-2016 09:24 AM
    generalized linear model, scientific design, structured modeling
    • Replies: 0
    • Views: 4,538
    12-20-2016, 09:24 AM Go to last post
  29. What non-parametric test should I use?

    Hi all, I am looking for some help on finding an appropriate test to analyse the variance between groups. The data I am assessing is: -...

    Started by Nath‎, 12-20-2016 10:48 AM
    • Replies: 1
    • Views: 3,027
    12-21-2016, 01:24 AM Go to last post
  30. Parametric t-tests for individual / portfolio stock returns

    Hello everyone, I am relatively rookie with statistical tests and I am trying to perform a parametric t-test for stock returns as follows. I have...

    Started by hensor89‎, 12-20-2016 05:48 PM
    • Replies: 2
    • Views: 3,429
    12-21-2016, 10:22 AM Go to last post
  31. Centering level-1 interaction terms in HLM

    Dear all, I’m running multilevel analyses with HLM and wish to examine an interaction between two level 1 predictor variables. Following...

    Started by Linda Mueller‎, 12-21-2016 09:18 AM
    centering variables, hlm7, moderation, multi level
    • Replies: 1
    • Views: 2,767
    12-21-2016, 01:24 PM Go to last post
  32. Median or Mean vs Data distribution

    Hi, I am stuck at this point in my thesis in selected between Median and Mean. My data and work: I have a set of data X, and for each data y...

    Started by alwaqfi‎, 12-25-2016 09:04 AM
    • Replies: 3
    • Views: 3,245
    12-26-2016, 09:50 AM Go to last post
  33. Which statistical test shall I use please? Thanks a lot

    Hi I am trying to compare 2 groups- one that has had surgery on the same leg (37) vs opposite leg (48) and to compare whether there is any...

    Started by saral123123‎, 12-28-2016 04:08 PM
    • Replies: 3
    • Views: 3,664
    12-29-2016, 08:42 AM Go to last post
  34. SOS action research project question

    Firstly, I am grateful for any assistance. I am a novice who tries hard :yup: I am trying to write up the results section for a report and have...

    Started by zcl‎, 12-28-2016 11:47 PM
    • Replies: 1
    • Views: 3,222
    12-29-2016, 08:48 AM Go to last post
  35. how to obtain p-value from test statistic

    I am familiar with how to obtain the p-value from the t-statistic - the t-statistic is calculated by looking at the difference in means in two...

    Started by dliner‎, 12-29-2016 03:26 PM
    mathematica, normality, statistics
    • Replies: 0
    • Views: 2,788
    12-29-2016, 03:26 PM Go to last post
  36. 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: 3,981
    01-01-2017, 01:40 PM Go to last post
  37. Post MANOVA and MANCOVA - Help needed

    I have collected data with one Independent Variable (two levels - nominal) and 4 dependent variables (all scale - continuous). I decided to do a...

    Started by Em19133‎, 01-01-2017 05:29 PM
    • Replies: 0
    • Views: 2,403
    01-01-2017, 05:29 PM Go to last post
  38. 1 way Anova vs Two Way Anova -HELP needed

    I suck at stats and am always confused >.< I have 24 animals. Let's say I have 3 groups of animals (A,B,C) and 8 in each group. Each group...

    Started by BryRai‎, 01-03-2017 04:22 PM
    • Replies: 2
    • Views: 3,146
    01-05-2017, 09:06 AM Go to last post
  39. What statistical test do I use?

    Hi there, I'm doing a study on the influence of sexuality on a camouflaging questionnaire which has a score rating (0-40), so is an interval...

    Started by Mohil‎, 01-06-2017 11:16 AM
    • Replies: 1
    • Views: 2,896
    01-07-2017, 10:12 PM Go to last post
  40. What would be the appropriate statistical tool?

    Dear all, I am a graduate researcher in the analysis phase of my research work. My research is an intervention research (n=14) trying to analyze the...

    Started by Jerrome‎, 01-10-2017 04:35 PM
    binary varibles, likert sacle, normality, t-test
    • Replies: 3
    • Views: 2,568
    01-11-2017, 06:17 AM Go to last post
  41. 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: 2,879
    01-12-2017, 07:14 PM Go to last post
  42. Why does the following assumptions matter?

    When running an ANOVA we are told that certain assumptions of the test must be present for it to be applicable to the data. I never understood the...

    Started by feignfeign‎, 01-12-2017 07:24 PM
    • Replies: 0
    • Views: 1,802
    01-12-2017, 07:24 PM Go to last post
  43. Dealing with regression to the mean

    If I have two time points T1 and T2 and separate the groups based on their performance at T1 (High v Low), then after treatment assess their...

    Started by Palermo‎, 01-11-2017 08:10 AM
    • Replies: 4
    • Views: 3,036
    01-12-2017, 10:52 PM Go to last post
  44. Constant such that correlation is zero

    Suppose that we four random variables, A, B, C, D that have the same standard deviation. Here, A, B, C, and D are chosen randomly and independently...

    Started by penguin770727‎, 01-13-2017 01:17 AM
    • Replies: 0
    • Views: 1,875
    01-13-2017, 01:17 AM Go to last post
  45. Comparing two variable datasets

    Hello, I would like to see if two 2-dimentional datasets are the same, my data consists of two groups of xy data - the data is not linearly...

    Started by bjj‎, 01-13-2017 02:25 PM
    • Replies: 0
    • Views: 2,391
    01-13-2017, 02:25 PM Go to last post
  46. Question Comparing Intervention Groups for Students

    I am assigning interventions to student groups based on pre-test data (reading ability). I am using several different reading interventions. Our...

    Started by Educator7‎, 01-14-2017 11:00 AM
    • Replies: 0
    • Views: 2,386
    01-14-2017, 11:00 AM Go to last post
  47. Statistical analysis - Work Delay - Some tests relations

    Suppouse that we have a dataframe called dataWork with data from a database. There are several variables and 2 of them are: - Delay: time...

    Started by nhansolo‎, 01-18-2017 05:33 AM
    analysis method, contrast analysis, hypothesis testing, statistical analysis, tests
    • Replies: 0
    • Views: 2,180
    01-18-2017, 05:33 AM Go to last post
  48. How to obtain standard deviation of replicate experiments?

    I have been searching in books, fora and articles but I can't seem to find a clear cut answer to the following question: I ran two experiments...

    Started by FrenzyFire‎, 01-20-2017 03:40 AM
    • Replies: 0
    • Views: 2,593
    01-20-2017, 03:40 AM Go to last post
  49. Weighing male/female responses (30/70 distribution)

    Hi all! I've got a question. I received 617 responses to a questionnaire however, 445 of them are female (72%). There are two ways to fix this: ...

    Started by Nataschez‎, 01-25-2017 10:37 AM
    representativeness, weight
    • Replies: 1
    • Views: 2,281
    01-25-2017, 12:39 PM Go to last post
  50. Problem with unequal variance

    Greetings, Iíve collected some data on an office wellness program and have found mixed results between the treatment (wellness activities) and...

    Started by Luxor‎, 01-25-2017 06:57 PM
    • Replies: 1
    • Views: 2,282
    01-25-2017, 07:50 PM Go to last post
  51. utizing slightly different variables as 1 variable

    I am running a path model, and one of my DV's that I wish to utilize is course performance. The problem is that across my classes that are in my...

    Started by schue20‎, 01-26-2017 11:47 PM
    • Replies: 1
    • Views: 2,382
    01-27-2017, 03:31 PM Go to last post
  52. Looking for appropriate non-parametric test for 5 dependent group & small sample size

    What is the most appropriate parametric test for repeated observations for multiple dependent groups.

    Started by Zwsean‎, 01-28-2017 01:08 PM
    dependent groups, nonparametric, small sample, test
    • Replies: 1
    • Views: 2,257
    01-29-2017, 12:56 AM Go to last post
  53. Unsure of which statistical method to use- Please help!

    Hello, I'm writing a research proposal but I don't have a strong background in statistics. It would be great if someone can let me know which...

    Started by macjkk‎, 01-30-2017 12:01 AM
    • Replies: 2
    • Views: 2,423
    01-30-2017, 04:24 PM Go to last post
  54. How to rank factors of a confirmatory factor analysis?

    Hey there, within my current study I would like to determine the importance of different behavioral intentions. Since behavioral intentions are...

    Started by Fk2803‎, 01-30-2017 05:52 PM
    • Replies: 0
    • Views: 1,681
    01-30-2017, 05:52 PM Go to last post
  55. HELP: Using Data on Different Spatial Scales for Econometric Regressions

    *Background: Using a Production Function in form of Autoregressive Regression Model for Regional Perfomance* Hi, This question is more of a...

    Started by dave_123‎, 02-03-2017 03:06 AM
    dataset, econometric, regression, scale, spatial
    • Replies: 0
    • Views: 1,488
    02-03-2017, 03:06 AM Go to last post
  56. Help understanding separate- and joint- factor analyses in CFA and ESEM

    Folks, I am reading an article that tested 2 models--one with an hypothesized separate-factor relationship between five pairs of personality...

    Started by barrygrant‎, 02-02-2017 01:24 PM
    cfa, esem, factor analysis
    • Replies: 2
    • Views: 2,127
    02-03-2017, 10:43 AM Go to last post
  57. Wink Stuck with my darn P value

    Hey guys So I've been doing some medical research and I have a great result by no idea how to approach working out the P value. Basically with...

    Started by PKrazda‎, 01-26-2017 12:24 PM
    4 Pages
    1 2 3 ... 4
    • Replies: 45
    • Views: 13,004
    02-03-2017, 03:02 PM Go to last post
  58. Medical Device Testing (CV%)

    Hi all, looking for a bit of help. I have a number of medical devices to test, 150 to be precise. Two levels of sample to test on each device. I...

    Started by mattjdenmead‎, 02-04-2017 12:07 PM
    • Replies: 0
    • Views: 1,898
    02-04-2017, 12:07 PM Go to last post
  59. Theoretical Regression Problems

    What is the term for when your outcome variable is truncated and that may be dampening your results? For example, you use a dichotomous outcome for...

    Started by kmed‎, 02-06-2017 03:52 PM
    • Replies: 11
    • Views: 2,335
    02-07-2017, 09:52 AM Go to last post
  60. Correlation length

    Hi all, I'm working on a hydrological model. I supposed to build a mesh with correlation length in the permeability field. I know what is the...

    Started by Evyatar‎, 02-02-2017 04:14 AM
    correlation, correlation length
    • Replies: 7
    • Views: 2,992
    02-08-2017, 10:34 AM Go to last post

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