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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: 9,381
    10-11-2014, 01:02 PM Go to last post
  1. Dealing with unknown dependencies between variables

    Hi! I have a system where I'm studying 3 different diseases, however they share some pathological similarities. There is no data on them being...

    Started by Szkeptik‎, Yesterday 08:31 AM
    • Replies: 2
    • Views: 100
    Yesterday, 10:51 PM Go to last post
  2. Exclamation Need help selecting appropriate test

    I'm currently trying to select the appropriate significance test and test of association and would really appreciate some help. My independent...

    Started by geosfranklin‎, Yesterday 02:38 PM
    chi sq test, ordinal and categorical
    • Replies: 0
    • Views: 66
    Yesterday, 02:38 PM Go to last post
  3. Experimental design: ANOVA? help!

    Hello, I have to analyze one paramater (lipid content) of seeds from 5 different cultivars. I am planning to do two independent analysis of the...

    Started by Arwen82‎, Yesterday 02:18 PM
    • Replies: 0
    • Views: 50
    Yesterday, 02:18 PM Go to last post
  4. Correcting alpha for multiple anovas

    Hi! I have 7 different properties, all independent, that are being mesured. Each property has a control and three disease groups. All independent....

    Started by Szkeptik‎, 02-25-2017 03:30 PM
    • Replies: 0
    • Views: 89
    02-25-2017, 03:30 PM Go to last post
  5. Stats Help please...

    Hi, I'm not the best at stats so please keep terms and approaches in layman's terms please - I currently use SPSS too :) I'm not too sure which...

    Started by JD823‎, 02-24-2017 11:53 AM
    • Replies: 0
    • Views: 88
    02-24-2017, 11:53 AM Go to last post
  6. ANOVA or t-test?

    I want to test 2 different treatments (diets), repeating each treatment 3 times on 25 individuals independent samples. After each repetition, four...

    Started by marloncalispa‎, 02-20-2017 12:23 PM
    anova, t-test
    • Replies: 1
    • Views: 207
    02-20-2017, 02:05 PM Go to last post
  7. Poisson Distribution

    Hi, I am using the Poission distribution to calculate probabillity for x = X. Poisson distribution is skewed to the right when lambda is small....

    Started by samot79‎, 02-08-2017 08:21 AM
    • Replies: 7
    • Views: 392
    02-20-2017, 05:07 AM Go to last post
  8. obtain inter-aarival from bulk arrival

    I have some data regarding the arrival of customers at a shop. These arrivals are bulk arrivals which have been collected at fixed time intervals...

    Started by mohsenhs82‎, 02-16-2017 05:22 PM
    2 Pages
    1 2
    arrival time, probabilities, queuing theory, random variable, stochastic
    • Replies: 16
    • Views: 489
    02-19-2017, 05:24 PM Go to last post
  9. Help with confirming what I can and cannot conclude from this regression output

    This study tried to determine the factors influencing the probability that voters would be asked to show ID in order to vote in a certain state...

    Started by Harry717‎, 02-18-2017 12:14 PM
    • Replies: 1
    • Views: 68
    02-19-2017, 04:55 PM Go to last post
  10. Help with master thesis method for analysis, first time quantitative research

    Deleted because of serious flaw in question asked. Will edit with an update

    Started by seaturtle‎, 02-17-2017 07:10 PM
    • Replies: 0
    • Views: 193
    02-17-2017, 07:10 PM Go to last post
  11. Smile What model to use?

    Hi, I'm currently doing a piece of research that requires statistical analysis however this is very out of my comfort zone and I am unsure of what...

    Started by jmht‎, 02-17-2017 08:23 AM
    pattern
    • Replies: 2
    • Views: 154
    02-17-2017, 04:14 PM Go to last post
  12. Sample size determination for ANOVA / KRUSKAL WALIS

    Hi! I need help with my dissertation regarding sample size calculation. I will be grateful if anybody can help me out with this... My study...

    Started by janicedsa‎, 02-16-2017 11:04 PM
    sample size
    • Replies: 0
    • Views: 139
    02-16-2017, 11:04 PM Go to last post
  13. RMSEA manually

    Hello, I'm working with the trial version of a software that does not allow me to calculate the RMSEA for my CFA. Could I calculate this manually?...

    Started by ernesthor‎, 02-13-2017 04:50 AM
    • Replies: 0
    • Views: 183
    02-13-2017, 04:50 AM Go to last post
  14. is my concept of averaging averages under this scenario wrong?

    hi all, I'm confused on the concept of whether or not to average the averages under this scenario, when the data collected are from different...

    Started by stat newbie L‎, 02-11-2017 04:48 AM
    averaging averages
    • Replies: 0
    • Views: 188
    02-11-2017, 04:48 AM Go to last post
  15. 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: 450
    02-08-2017, 10:34 AM Go to last post
  16. 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: 281
    02-07-2017, 09:52 AM Go to last post
  17. 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: 184
    02-04-2017, 12:07 PM Go to last post
  18. 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: 1,546
    02-03-2017, 03:02 PM Go to last post
  19. 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: 247
    02-03-2017, 10:43 AM Go to last post
  20. 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: 142
    02-03-2017, 03:06 AM Go to last post
  21. 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: 178
    01-30-2017, 05:52 PM Go to last post
  22. 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: 226
    01-30-2017, 04:24 PM Go to last post
  23. 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: 283
    01-29-2017, 12:56 AM Go to last post
  24. 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: 271
    01-27-2017, 03:31 PM Go to last post
  25. 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: 243
    01-25-2017, 07:50 PM Go to last post
  26. 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: 205
    01-25-2017, 12:39 PM Go to last post
  27. 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: 348
    01-20-2017, 03:40 AM Go to last post
  28. 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: 261
    01-18-2017, 05:33 AM Go to last post
  29. 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: 385
    01-14-2017, 11:00 AM Go to last post
  30. 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: 316
    01-13-2017, 02:25 PM Go to last post
  31. 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: 254
    01-13-2017, 01:17 AM Go to last post
  32. 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: 394
    01-12-2017, 10:52 PM Go to last post
  33. 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: 243
    01-12-2017, 07:24 PM Go to last post
  34. 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: 398
    01-12-2017, 07:14 PM Go to last post
  35. 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: 328
    01-11-2017, 06:17 AM Go to last post
  36. 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: 415
    01-07-2017, 10:12 PM Go to last post
  37. 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: 466
    01-05-2017, 09:06 AM Go to last post
  38. 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: 390
    01-01-2017, 05:29 PM Go to last post
  39. 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: 488
    01-01-2017, 01:40 PM Go to last post
  40. 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: 414
    12-29-2016, 03:26 PM Go to last post
  41. 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: 382
    12-29-2016, 08:48 AM Go to last post
  42. 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: 450
    12-29-2016, 08:42 AM Go to last post
  43. 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: 545
    12-26-2016, 09:50 AM Go to last post
  44. 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: 524
    12-21-2016, 01:24 PM Go to last post
  45. 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: 505
    12-21-2016, 10:22 AM Go to last post
  46. 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: 489
    12-21-2016, 01:24 AM Go to last post
  47. 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: 385
    12-20-2016, 09:24 AM Go to last post
  48. 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: 53,712
    12-17-2016, 02:18 AM Go to last post
  49. 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: 966
    12-16-2016, 10:35 AM Go to last post
  50. 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: 458
    12-16-2016, 10:29 AM Go to last post
  51. 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: 510
    12-13-2016, 08:11 AM Go to last post
  52. 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: 646
    12-12-2016, 12:15 PM Go to last post
  53. 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: 526
    12-12-2016, 09:48 AM Go to last post
  54. 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: 480
    12-07-2016, 01:44 AM Go to last post
  55. 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: 466
    12-06-2016, 02:24 PM Go to last post
  56. 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: 722
    12-05-2016, 03:20 PM Go to last post
  57. 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: 570
    12-01-2016, 02:37 PM Go to last post
  58. 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: 467
    11-30-2016, 11:35 AM Go to last post
  59. 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: 541
    11-26-2016, 12:56 AM Go to last post
  60. 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: 621
    11-24-2016, 03:31 PM Go to last post

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