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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: 8,709
    10-11-2014, 01:02 PM Go to last post
  1. 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: 109
    01-20-2017, 03:40 AM Go to last post
  2. 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: 97
    01-18-2017, 05:33 AM Go to last post
  3. 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: 202
    01-14-2017, 11:00 AM Go to last post
  4. 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: 152
    01-13-2017, 02:25 PM Go to last post
  5. 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: 102
    01-13-2017, 01:17 AM Go to last post
  6. 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: 195
    01-12-2017, 10:52 PM Go to last post
  7. 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: 89
    01-12-2017, 07:24 PM Go to last post
  8. 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: 211
    01-12-2017, 07:14 PM Go to last post
  9. 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: 169
    01-11-2017, 06:17 AM Go to last post
  10. 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: 225
    01-07-2017, 10:12 PM Go to last post
  11. 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: 280
    01-05-2017, 09:06 AM Go to last post
  12. 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: 227
    01-01-2017, 05:29 PM Go to last post
  13. 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: 290
    01-01-2017, 01:40 PM Go to last post
  14. 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: 213
    12-29-2016, 03:26 PM Go to last post
  15. 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: 203
    12-29-2016, 08:48 AM Go to last post
  16. 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: 253
    12-29-2016, 08:42 AM Go to last post
  17. 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: 302
    12-26-2016, 09:50 AM Go to last post
  18. 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: 320
    12-21-2016, 01:24 PM Go to last post
  19. 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: 284
    12-21-2016, 10:22 AM Go to last post
  20. 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: 275
    12-21-2016, 01:24 AM Go to last post
  21. 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: 196
    12-20-2016, 09:24 AM Go to last post
  22. 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 04:08 AM
    • Replies: 8
    • Views: 52,707
    12-17-2016, 02:18 AM Go to last post
  23. 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: 656
    12-16-2016, 10:35 AM Go to last post
  24. 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: 256
    12-16-2016, 10:29 AM Go to last post
  25. 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: 292
    12-13-2016, 08:11 AM Go to last post
  26. 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: 3
    • Views: 449
    12-12-2016, 12:15 PM Go to last post
  27. 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: 323
    12-12-2016, 09:48 AM Go to last post
  28. 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: 274
    12-07-2016, 01:44 AM Go to last post
  29. 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: 272
    12-06-2016, 02:24 PM Go to last post
  30. 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: 494
    12-05-2016, 03:20 PM Go to last post
  31. 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: 341
    12-01-2016, 02:37 PM Go to last post
  32. 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: 268
    11-30-2016, 11:35 AM Go to last post
  33. 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: 361
    11-26-2016, 12:56 AM Go to last post
  34. 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: 380
    11-24-2016, 03:31 PM Go to last post
  35. sure independence screening in clustering

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

    Started by Amir91‎, 11-22-2016 02:39 AM
    clustering, screening
    • Replies: 3
    • Views: 341
    11-23-2016, 01:01 AM Go to last post
  36. 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: 323
    11-22-2016, 02:02 PM Go to last post
  37. 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: 261
    11-22-2016, 01:44 PM Go to last post
  38. 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: 325
    11-21-2016, 01:51 PM Go to last post
  39. 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: 310
    11-21-2016, 03:10 AM Go to last post
  40. 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: 263
    11-19-2016, 09:49 AM Go to last post
  41. 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: 263
    11-19-2016, 03:19 AM Go to last post
  42. 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: 313
    11-18-2016, 03:18 PM Go to last post
  43. 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: 290
    11-18-2016, 06:28 AM Go to last post
  44. 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: 282
    11-18-2016, 04:13 AM Go to last post
  45. 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: 396
    11-15-2016, 06:12 AM Go to last post
  46. 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: 308
    11-14-2016, 04:21 PM Go to last post
  47. 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: 424
    11-14-2016, 03:21 AM Go to last post
  48. 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: 386
    11-11-2016, 03:40 PM Go to last post
  49. Question - Is Simpson's Paradox the same as spuriousness

    Hi all, I am currently trying to learn about research methodology by using the book of Dooley called Social Research Methods. I am however a...

    Started by cs_ut‎, 11-07-2016 05:34 PM
    • Replies: 3
    • Views: 442
    11-08-2016, 08:35 AM Go to last post
  50. Survey on how frequently a group use a particular device: Which analysis methods?

    I surveyed a group of photographers and asked them how frequently they used a particular type of lens for a specific type of photograph. I now want...

    Started by clivegibbs‎, 11-08-2016 06:51 AM
    friedman test, survey, wilcoxon
    • Replies: 0
    • Views: 298
    11-08-2016, 06:51 AM Go to last post
  51. Difference between two independent proportions

    Hello, I am not a statistician, however, for my latest small research, I would like to test whether there is a difference between two independent...

    Started by Zuzanah‎, 11-07-2016 07:10 AM
    chi-square, proportion test, z-test
    • Replies: 3
    • Views: 366
    11-07-2016, 10:15 AM Go to last post
  52. which statistical test to use - Observed difference in outcome is due to chance?

    Hi, I have results from two very sensitive but different lab test trying to find pathogen in a patient sample. For some patients, results from two...

    Started by deepbiomed‎, 11-03-2016 09:49 PM
    • Replies: 12
    • Views: 623
    11-06-2016, 08:07 PM Go to last post
  53. What can the standard errors tell me?

    Hello dear forum members! I wanted to share with you a couple graphs and seek your wisdom on the insights that I may be omitting. According to...

    Started by kiton‎, 11-06-2016 12:22 PM
    • Replies: 0
    • Views: 343
    11-06-2016, 12:22 PM Go to last post
  54. Balance in covariates in randomized trials

    Hi, I am new to this forum and have a question regarding randomized controlled trials (RCT). How can you mathematically/statistically derive that...

    Started by tompa‎, 11-05-2016 10:51 AM
    • Replies: 0
    • Views: 325
    11-05-2016, 10:51 AM Go to last post
  55. Question about parametric and nonparametric tests and non-probability sampling

    I think I am pretty clear on the differences between parametric and nonparametric tests and which is more appropriate to use given the data you have...

    Started by momanger‎, 11-03-2016 04:07 PM
    non probability, nonparametric, parametric
    • Replies: 3
    • Views: 403
    11-03-2016, 05:56 PM Go to last post
  56. measure of effect size for categorical association

    Hello, I am having difficulties in wrapping my head around an issue regarding chi-squared statistic, Cramer's V, and Cohen's measure of effect...

    Started by gianmarco‎, 11-03-2016 04:37 AM
    • Replies: 1
    • Views: 350
    11-03-2016, 09:20 AM Go to last post
  57. Power calculation with measurement error on Y

    I'm trying to do a power calculation for a study I'm involved in, and I'm a bit stuck. The study is about textual cues of trust. We want to...

    Started by Junes‎, 11-01-2016 08:22 AM
    measurement error, multicolinearity, power
    • Replies: 12
    • Views: 591
    11-01-2016, 08:02 PM Go to last post
  58. Anova without intercept?

    Is it possible to perform Anova without an intercept? In the software, there is an option to check the box that says ďno interceptĒ. Once I do...

    Started by elad83‎, 10-31-2016 02:55 PM
    anova, anova intercept
    • Replies: 3
    • Views: 432
    10-31-2016, 04:02 PM Go to last post
  59. Two mediators (serial mediation)

    Dear all, I am writing my master thesis and really need help with one issue. I am investigating the following serial mediation (so 2 mediators...

    Started by StatHanna‎, 10-27-2016 12:53 PM
    • Replies: 0
    • Views: 408
    10-27-2016, 12:53 PM Go to last post
  60. Repeated measures with different cohorts

    Dear all, I have data from 3 different art groups (orchestra, dance, musical theatre) collected in 3 different times of measure. Data is...

    Started by Subcora‎, 10-27-2016 07:36 AM
    cohort, repeated measures
    • Replies: 0
    • Views: 313
    10-27-2016, 07:36 AM Go to last post

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