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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: 18,755
    10-11-2014, 12:02 PM Go to last post
  1. statistical analysis- ANOVA, t test, questionnaire

    Hi all, I am doing a mini research in HCI filed which examine the differences between pen touch and finger touch on specific Smartphone. I have...

    Started by hila‎, 02-02-2013 10:49 AM
    • Replies: 5
    • Views: 3,401
    02-04-2013, 04:44 PM Go to last post
  2. Mann Whitney

    Hi guys, Do you know if it's normal to get a U= 0.000 (z= -2.32, exact Sig = 0.029 with 4 subjects in each group)? Thanks

    Started by hills‎, 09-20-2013 07:45 AM
    • Replies: 0
    • Views: 2,002
    09-20-2013, 07:45 AM Go to last post
  3. website splits - sample sizes

    Id like to do some research into website splits. As visitors arrive to one of our websites (lets call it id=123), the page will randomly deliever...

    Started by hip_au‎, 11-19-2008 08:47 PM
    • Replies: 0
    • Views: 2,107
    11-19-2008, 08:47 PM Go to last post
  4. Bayesian Me

    We had a (prior) hypothesis that these two binary groups were 30% different. So two categorical variables that are binary. We have the data and they...

    Started by hlsmith‎, 06-19-2015 03:54 PM
    • Replies: 0
    • Views: 1,263
    06-19-2015, 03:54 PM Go to last post
  5. Critiques Requested on Resampling as an Approach

    I found an old piece code I wrote. I had a logistic model with a multiplicative interaction term consisting of two binary variables plus model...

    Started by hlsmith‎, 10-22-2015 09:50 AM
    • Replies: 6
    • Views: 1,774
    10-22-2015, 03:23 PM Go to last post
  6. Wilcoxon sign rank test and sample size

    In the Wilcoxon signed rank test, it uses the binomial distribution to calculate p-value for n<20. What would it use if greater/equal to 20?

    Started by hlsmith‎, 03-07-2016 01:50 PM
    • Replies: 2
    • Views: 2,117
    03-07-2016, 04:21 PM Go to last post
  7. Non-Inferiority Test in Multple Logistic Model

    Does any body have any insight or experience running a non-inferiority test based on multiple linear or logistic regression. So perhaps mean and risk...

    Started by hlsmith‎, 03-24-2016 11:59 AM
    • Replies: 1
    • Views: 1,214
    03-28-2016, 01:22 PM Go to last post
  8. Influence of a person in repeat measurement (multilevel) or longitudinal data

    Hey, I have a dataset of 50 people with 4 responses over the year. Responses were a 5-point Likert scale collapsed into a binary variable (0,1)....

    Started by hlsmith‎, 07-07-2016 09:47 AM
    • Replies: 3
    • Views: 1,100
    07-08-2016, 11:23 AM Go to last post
  9. 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: 2,630
    11-14-2016, 03:21 AM Go to last post
  10. 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: 7,172
    12-16-2016, 10:35 AM Go to last post
  11. Sample Size Calc for Right Skewed Data

    I have a request from a person for a sample size calculation. When I requested information about the potential study data they provided two means and...

    Started by hlsmith‎, 06-09-2017 10:44 PM
    power, simulation
    • Replies: 14
    • Views: 1,572
    06-14-2017, 11:30 AM Go to last post
  12. How to model time intervals

    I have a dataset that I am trying to analyze that contains price information for a market index. I suspect that the behavior of the price for this...

    Started by hodag‎, 02-20-2012 10:07 AM
    • Replies: 0
    • Views: 1,476
    02-20-2012, 10:07 AM Go to last post
  13. which test?

    Hi i have some data and i want to analysis them. i have 64 mouses at 8 group, i took 2 drugs to them with different tubes and doses. so i want...

    Started by hol‎, 07-13-2013 03:18 AM
    • Replies: 1
    • Views: 1,376
    07-13-2013, 06:49 AM Go to last post
  14. Need help on the suitable design selection

    hi guys... i have been given a set of data with 5 input factors and 1 output. among the inputs, 3 are in numerical form and another 2 are in...

    Started by holeow‎, 03-11-2012 10:48 AM
    • Replies: 0
    • Views: 2,421
    03-11-2012, 10:48 AM Go to last post
  15. breaking data into training and testing (hold-out) sets

    Dear Stats Forum, I am a grad student with an introductory stats background. For my research, I'm conducting an experiment to compare the predictive...

    Started by hollywas‎, 07-21-2012 01:30 PM
    • Replies: 3
    • Views: 2,737
    07-21-2012, 04:47 PM Go to last post
  16. Basic question on Spearman's correlation coefficient

    Hey guys, If I understand correctly, when calculating Spearman's correlation coefficient you just rank your variables, and then calculate...

    Started by Hombre‎, 02-24-2014 11:05 AM
    • Replies: 5
    • Views: 1,296
    02-24-2014, 01:37 PM Go to last post
  17. correcting for early user bias

    Okay, forgive me if this is in the wrong place. Feel free to move it if it isn't. And please forgive me as I know VERY little about statistics and my...

    Started by hoodleehoo‎, 07-20-2015 01:38 PM
    • Replies: 7
    • Views: 2,276
    07-20-2015, 08:24 PM Go to last post
  18. Correct terminology? Expected FPR vs Observed FPR

    Hi. My first post here, great forum! I have a "terminology problem". I'm devising a statistical test, and it works fine but has a flaw; it is...

    Started by Hoogard‎, 10-10-2011 03:09 AM
    • Replies: 0
    • Views: 2,106
    10-10-2011, 03:09 AM Go to last post
  19. Which Tests to applicate for Trends?

    Hi everyone, it's christmas time again, which for me means, some free time :) During my free time I looked to acquire a bit more knowledge in some...

    Started by horror‎, 12-23-2015 08:42 AM
    • Replies: 2
    • Views: 1,454
    12-23-2015, 12:49 PM Go to last post
  20. What is the purpose of multigroup invariance test?

    Hi, I am confused about the purpose of multigroup test. According to Byrne (2008), many studies focus on multigroup comparisons, and assume two...

    Started by Hosam‎, 03-10-2013 10:48 AM
    • Replies: 2
    • Views: 1,951
    03-10-2013, 08:52 PM Go to last post
  21. Help Me ........

    I am looking for a topic for my Mphil research. I am fed up with searching for a topic. i am interested in computational statistics, multivariate...

    Started by hpanoo‎, 10-26-2011 09:26 AM
    • Replies: 6
    • Views: 2,008
    10-27-2011, 03:57 PM Go to last post
  22. Cumulative Periodogram

    Hello, As part of my master's research, I am exploring a cyclic pattern in daily climate data (latent heat flux). To explore this pattern, I...

    Started by hpants24‎, 12-07-2010 10:40 PM
    • Replies: 1
    • Views: 5,205
    10-20-2013, 11:17 PM Go to last post
  23. Joint Normal CDF

    Hello I am new to this forum as well as to actuary field. I have this question: There are two random variables X_1 and X_2 following standard...

    Started by hpriye‎, 06-19-2008 05:10 AM
    • Replies: 7
    • Views: 7,549
    06-20-2008, 08:13 AM Go to last post
  24. Methods help: How to find significant differences between groups with ordinal data?

    In examining how students performed at the detail level of an assignment, I have received data that is essentially in the form of a checklist....

    Started by hrh2101‎, 10-20-2012 10:39 PM
    • Replies: 3
    • Views: 2,650
    10-26-2012, 11:32 AM Go to last post
  25. Analysis with multiple unordered factors?

    Hi everyone, I hope some expert out there can point me in the right direction on this. I have a binomial outcome (A/B) and a number of...

    Started by hrj‎, 09-18-2010 03:50 PM
    • Replies: 0
    • Views: 2,071
    09-18-2010, 03:50 PM Go to last post
  26. Consistency in statistical tests

    Hiya, this is quite a basic question. I'm testing whether administration of a drug causes an increase in 7 different dependent variables. So my...

    Started by hrj21‎, 06-13-2012 08:53 AM
    • Replies: 1
    • Views: 4,065
    06-22-2012, 02:47 PM Go to last post
  27. Red face Appropriate form of ANOVA when blocking

    Hi, I'm new to this forum (and relatively new to statistics) and have a question :) I have a text book that outlines the following experiment: ...

    Started by hrj21‎, 06-06-2012 07:08 AM
    • Replies: 3
    • Views: 1,648
    06-21-2012, 03:51 AM Go to last post
  28. Multiple comparison tests with no ANOVA

    Hiya, I've tried to find an answer to my question by searching the net but I can't find any clear solution. I want to compare the effect of...

    Started by hrj21‎, 06-26-2012 11:56 AM
    • Replies: 0
    • Views: 1,512
    06-26-2012, 11:56 AM Go to last post
  29. MANOVA: IV with only two levels

    Hi, I'm a biological science university student with an interest in teaching myself some basic inferential statistic and have been learning about...

    Started by hrj21‎, 03-13-2013 04:41 AM
    • Replies: 2
    • Views: 1,638
    03-14-2013, 06:48 AM Go to last post
  30. Repeated measures where different cells from the same subject are used?

    Hi, I work in a lab where we routinely use people's cells in studies, comparing the effect of different treatments on those cells. We use the cells...

    Started by hrj21‎, 02-24-2014 10:47 AM
    • Replies: 0
    • Views: 727
    02-24-2014, 10:47 AM Go to last post
  31. Help needed urgently - dichotomous question

    Hi everyone, I have the following answers to the survey question "are you a new client" (Yes/No). My sample is 1200 clients with 520 respondents....

    Started by hsaharmo‎, 07-27-2011 07:32 AM
    • Replies: 5
    • Views: 3,194
    07-28-2011, 07:54 AM Go to last post
  32. Cool How do you account for under representation in your survey sample

    Overall, i have 10 groups in my sample. 2 groups are under represented. What is the best way to account for this under representation. Would...

    Started by hsaharmo‎, 08-06-2011 04:50 PM
    • Replies: 1
    • Views: 2,226
    08-08-2011, 03:18 AM Go to last post
  33. Op notation

    Hey Guys. It is my first time here. Glad to meet you all. I've got a question on Op notation. In my research, I've got an assumption associated...

    Started by hslinhc‎, 11-13-2010 03:59 AM
    • Replies: 2
    • Views: 2,900
    12-04-2010, 05:18 PM Go to last post
  34. How do we do statistics on repeated phenomenon?

    Hi everyone, I've got a question on statistics on repeated phenomenons. For example, If I have a time series data which I used exploratory data...

    Started by hslinhc‎, 12-04-2010 05:28 PM
    • Replies: 0
    • Views: 3,369
    12-04-2010, 05:28 PM Go to last post
  35. How to estimate two series covariance with unlined observed data?

    Sorry if I use the wrong terminology. My problem is, suppose I have two time series, they change every day. However, I can only observe them...

    Started by hslinhc‎, 08-17-2011 09:28 PM
    • Replies: 1
    • Views: 1,912
    08-17-2011, 10:22 PM Go to last post
  36. multinomial distribution and degrees of freedom

    Hi I have some data from a housing survey (sample size 13,500) and have found that the proportion of privately rented housing is slightly higher...

    Started by hughm‎, 03-25-2014 03:53 AM
    degreees of freedom, multinomial, significance test, t-distribution
    • Replies: 2
    • Views: 1,020
    03-26-2014, 05:17 AM Go to last post
  37. (Using R) Whatís the right test to compare for significance?

    First of all, many thanks for looking at this post. My problem is partly technical knowledge (or lack of), but mainly one of perception! Iíve been...

    Started by Hugster‎, 05-24-2013 05:47 AM
    significance test
    • Replies: 0
    • Views: 13,695
    05-24-2013, 05:47 AM Go to last post
  38. how to calculate SD or SEM of ratios?

    I have 2 groups of data. Group1: x1,x2,x3,x4. Group2:y1,y2,y3,y4. I want to get the ratio of y over x (Y/X) and also needs to know the SD or SEM of...

    Started by huimeizheng‎, 07-09-2014 01:33 AM
    • Replies: 3
    • Views: 2,951
    07-10-2014, 08:34 AM Go to last post
  39. About Sampling

    My manager wants me to do a research about advance purchase day vs. fare. however it involves too many categories, and we have billions of tickets...

    Started by humanmaycry‎, 11-19-2009 12:05 AM
    • Replies: 0
    • Views: 2,231
    11-19-2009, 12:05 AM Go to last post
  40. Comparing means from SAME sample

    I've done an experiment with human participants, n=40, so it's a large sample n>=30 from a large population. Now I'm trying to understand the...

    Started by HumanParticipantResearch‎, 09-01-2010 01:35 PM
    • Replies: 0
    • Views: 3,671
    09-01-2010, 01:35 PM Go to last post
  41. Do I need separate margins of error?

    I have a question regarding margins of error. I'm looking for correlations between political knowledge and favorability of presidential candidates...

    Started by Husker‎, 10-13-2011 11:01 AM
    • Replies: 0
    • Views: 1,631
    10-13-2011, 11:01 AM Go to last post
  42. Quantifi the homogeneity

    Hello i am hydrologe and i search to find a solution for the following problem: Suppose that i have k samples of observations (region) of the...

    Started by Hussein‎, 05-28-2013 01:24 PM
    homogeneity
    • Replies: 2
    • Views: 1,420
    05-30-2013, 09:33 AM Go to last post
  43. Lightbulb test for compariing pre- post test on same anonymized participants

    I am conducting a research to study the change in business skills, and attitude towards self employment after a compulsory intervention program for...

    Started by Husssy‎, 10-03-2016 07:20 PM
    • Replies: 0
    • Views: 2,132
    10-03-2016, 07:20 PM Go to last post
  44. Hypothesis testing for comparing single channels of states in multivariate HMM

    In brief: I have a multivariate observational output with low covariances, each dimension of which can be considered the result of a distinct hidden...

    Started by hythlodaeus‎, 02-14-2011 02:21 PM
    hidden markov models, hypothesis testing
    • Replies: 1
    • Views: 2,496
    02-23-2011, 03:34 AM Go to last post
  45. 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: 1,783
    12-08-2014, 01:45 PM Go to last post
  46. 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: 2
    • Views: 2,090
    01-28-2015, 03:50 PM Go to last post
  47. Compute an optimization stress from size distribution density and abundance

    Hi everyone, Here's the shortest version of this optimization problem: - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -...

    Started by Iago-lito‎, 06-23-2014 04:56 AM
    abundance, distribution density, optimization, simulation, stress
    • Replies: 0
    • Views: 1,288
    06-23-2014, 04:56 AM Go to last post
  48. MS Thesis Topic Recommendations from Journals concentrating on Parametric Tests

    I would like to know if you can recommend sites where journals, particularly statistical researches, can be viewed completely. Alternatively, can you...

    Started by iamflozum‎, 05-17-2014 10:24 PM
    parametric, recommendation, simulation, thesis
    • Replies: 0
    • Views: 1,272
    05-17-2014, 10:24 PM Go to last post
  49. 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 02:39 PM
    • Replies: 0
    • Views: 1,603
    09-29-2014, 02:39 PM Go to last post
  50. Autocorrelation of panel data: need literature!

    I have (so-called) dynamical monte carlo model of a number of identical chains within simulation box And i've measured some data (like radius of...

    Started by icegood‎, 08-21-2012 06:13 AM
    • Replies: 2
    • Views: 1,858
    08-24-2012, 11:38 AM Go to last post
  51. Normal Extreme Values

    Mostly I have been answering questions, but today I am asking one: what is the distribution of the maximum of n draws from a normal distribution? ...

    Started by ichbin‎, 10-15-2010 05:49 PM
    • Replies: 2
    • Views: 2,849
    10-17-2010, 11:19 PM Go to last post
  52. Kolmogorov-Smirnov to Lattice Path mapping

    I often see the claim that the null distribution of Kolmogorov's D+ statistic maps onto a lattice path problem that requires computing the number of...

    Started by ichbin‎, 02-17-2011 05:11 PM
    • Replies: 0
    • Views: 2,406
    02-17-2011, 05:11 PM Go to last post
  53. Smile Appropriate method for research model

    Hi guys! Please i need your advice! I have developed a model about some factors that influence the desire of members to share information is...

    Started by icsd04‎, 07-22-2011 09:33 AM
    2 Pages
    1 2
    • Replies: 16
    • Views: 6,166
    07-26-2011, 10:11 PM Go to last post
  54. Bayesian analysis of logistic dependent variable, with between and within subjects in

    I have a dataset consisting of two groups of participants (25 participants in one group and 26 in the other), with each participating in two...

    Started by idif‎, 09-01-2016 02:19 AM
    bayesian analysis, hierarchical bayesian, jags
    • Replies: 0
    • Views: 719
    09-01-2016, 02:19 AM Go to last post
  55. Comparing the output of JAGS to conjugate analysis - normal with unknown mean and var

    Dear Bayesians. I'm starting my way in the Bayesian world, and I'm trying to build a simple model for estimating the mean and variance of a normal...

    Started by idif‎, 09-20-2016 09:02 AM
    bayesian, conjugate, jags, mcmc
    • Replies: 0
    • Views: 1,059
    09-20-2016, 09:02 AM Go to last post
  56. Question What tests should I use to analyze my data? Immediate input appreciated

    Hello TalkStats members :wave: I have some data I need to analyze. I first would like to say I hope I am posting this in the correct sub-forum,...

    Started by IDmedicine‎, 04-10-2011 03:48 PM
    unequal sample size, wilcoxon
    • Replies: 2
    • Views: 4,275
    04-10-2011, 07:13 PM Go to last post
  57. How to compare the convergence over time between two groups?

    Hello, My goal is to check if the convergence of the Interquartile Range (IQR) over time is significantly different between two groups. I have...

    Started by ido‎, 07-31-2013 03:10 AM
    • Replies: 0
    • Views: 1,367
    07-31-2013, 03:10 AM Go to last post
  58. Unable to determine the right test?

    hello, I'm doing a paper on measuring authors productivity and unable to decide what should I use as my statistical test to come up with solid...

    Started by iha2005‎, 10-10-2013 04:23 PM
    • Replies: 8
    • Views: 2,396
    10-20-2013, 01:09 PM Go to last post
  59. Exclamation Urgent Help Needed!!!

    Hi. I am getting really confused... Conducted a research with 6 people. they had 2 different conditions (medicine and placebo), and they were all...

    Started by ihatestats‎, 10-30-2011 11:22 AM
    • Replies: 1
    • Views: 1,909
    10-31-2011, 11:50 AM Go to last post
  60. Promo analysis

    Hi everyone, Can you please give a hint on what method I should use to find price anomalies on one market if I have POS data for the entire...

    Started by Ikonanyk‎, 09-30-2013 05:39 AM
    • Replies: 0
    • Views: 2,032
    09-30-2013, 05:39 AM Go to last post

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