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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: 18,772
    10-11-2014, 12:02 PM Go to last post
  1. Probability distribution function

    Can somebody explain what is probability distribution function and probability density function in layman terms?? Thanks

    Started by vikash_124124‎, 03-12-2016 03:51 PM
    • Replies: 0
    • Views: 1,517
    03-12-2016, 03:51 PM Go to last post
  2. Effect-size Two-way ANOVA repeated measures

    Dear statistical experts, I am getting confused on how to compute effect size in two-way ANOVA with repeated measures. - Should I use Cohen d...

    Started by tkdn‎, 09-30-2015 06:14 AM
    • Replies: 0
    • Views: 1,934
    09-30-2015, 06:14 AM Go to last post
  3. Statistical analysis on redistricting and women in office; sample size, ideas??

    Okay. I have this huge paper that I've been working on for umpteen thousand years. I really need to graduate from college. The question: how does...

    Started by fireball‎, 10-20-2015 06:24 AM
    • Replies: 0
    • Views: 1,025
    10-20-2015, 06:24 AM Go to last post
  4. Difference between samples in terms of frequency ranks

    I have 3 different texts, and for each one of them, I have the frequencies of 25 letters appearing in those texts (Text A, letter A, freq = 5013;...

    Started by NoelAramis‎, 10-07-2015 01:57 AM
    frequency, kruskal-wallis, ranking, ranks
    • Replies: 0
    • Views: 1,293
    10-07-2015, 01:57 AM Go to last post
  5. Choosing test for dependent anonymous sample comparisons

    I have data collected each year from 2010-2015. In this data I have demographic information and a self-reported score on a 5 pt Likert scale. The...

    Started by LCart‎, 10-08-2015 07:24 AM
    comparing means, dependent samples, statistical analysis
    • Replies: 0
    • Views: 1,042
    10-08-2015, 07:24 AM Go to last post
  6. Testing of correlation coefficients

    Hello, I am wondering if there is any way to test the significance of the correlation coefficients provided in the Eviews 7 cross-correlogram....

    Started by tpk1001‎, 10-11-2015 02:46 PM
    • Replies: 0
    • Views: 1,046
    10-11-2015, 02:46 PM Go to last post
  7. Multiple correspondence analysis with fuzzy coding

    Hello, I have a data set with six continuous variables. I would like to perform a multiple correspondence analysis (MCA) with fuzzy coding. I was...

    Started by Roni7‎, 10-12-2015 08:42 AM
    correspondence analysis, fuzzy coding, mca
    • Replies: 0
    • Views: 1,319
    10-12-2015, 08:42 AM Go to last post
  8. sample size for repeated measures

    Greetings everyone, a friend needs some stats help on her doctoral thesis. She is conducting a longitudinal, follow up, study on the same...

    Started by ivn‎, 10-29-2015 02:41 AM
    • Replies: 0
    • Views: 1,312
    10-29-2015, 02:41 AM Go to last post
  9. Multivariate generalization of Poisson-Gamma model?

    Hello! I actually assumed it would be easy to find a multivariate version of the Poisson distribution, but couldn't find any concrete solution (in...

    Started by abdhk383‎, 10-29-2015 08:01 AM
    • Replies: 0
    • Views: 1,240
    10-29-2015, 08:01 AM Go to last post
  10. Trouble with 3D geometric morphometrics/PCAs

    Hi all, I've been doing some 3D shape analyses using landmarks and analysed the resulting data using PCAs. I'm not very familiar with all this so...

    Started by SRuhl‎, 11-05-2015 05:52 AM
    3dgm, landmark, pca, shape analysis
    • Replies: 0
    • Views: 1,092
    11-05-2015, 05:52 AM Go to last post
  11. Calculate chance level in multiple choice

    Hello everyone. In short: I would like to know how to compute the chance-level of an 8-alternative multiple choice questionnaire with 6 questions....

    Started by Pernelle‎, 11-08-2015 07:27 AM
    • Replies: 0
    • Views: 2,445
    11-08-2015, 07:27 AM Go to last post
  12. Hybrid Network Inference

    I'm trying to figure out how to calculate the result mean and variance for a simple hybrid bayesian network comprised of 2 variables (to keep things...

    Started by Mark Balmer‎, 11-12-2015 09:30 AM
    bayesian network, continuous
    • Replies: 0
    • Views: 1,117
    11-12-2015, 09:30 AM Go to last post
  13. How to Identify Change from Initial Values in Time Course Data

    Hello, I am currently working on my Masters Thesis and am trying to figure out a way to determine when my data is different or not from the...

    Started by csmith125‎, 11-14-2015 11:09 PM
    • Replies: 0
    • Views: 920
    11-14-2015, 11:09 PM Go to last post
  14. How to differentiate between a global and a local method?

    Hello, I am trying to write a report based on prediction models and my topic requires me to cover one global method(regression for example) and a...

    Started by Nickie‎, 11-16-2015 07:01 PM
    global, help needed, local, prediction, question
    • Replies: 0
    • Views: 1,450
    11-16-2015, 07:01 PM Go to last post
  15. Justification for running an ANOVA after receiving non significant results on MANOVA

    Hi I ran a MANOVA model, with 2 DV's (2 groups of adolescents) and 1 IV with 3 categories ("strategies"). I got a non significant result, with P....

    Started by MichHoch‎, 11-15-2015 06:17 AM
    anova observations, manova bonferroni, publication, results
    • Replies: 0
    • Views: 1,274
    11-15-2015, 06:17 AM Go to last post
  16. Testing Model Fit between Subsets of Data When Using Multilevel Models

    When using multilevel models based on maximum likelihoods, one can use either deviance statistics (e.g., -2LLs) for nested models or information...

    Started by 3.14159‎, 11-18-2015 03:49 PM
    maximum likehood, model fit, mulitilevel model
    • Replies: 0
    • Views: 1,100
    11-18-2015, 03:49 PM Go to last post
  17. Question Identifying relevant predictors and interactions

    I have a data set comprising of 12,000 observations and 1,100 potential predictors (continuous and nominal) for a binary outcome/target variable. ...

    Started by Edwin_C‎, 11-23-2015 05:57 AM
    feature selection, statistical analysis, statistical research
    • Replies: 0
    • Views: 868
    11-23-2015, 05:57 AM Go to last post
  18. APA report format

    I have performed the Welch ANOVA due to the violation of homogeneity of variance. The df shown in spss is (2,164,078) Should I report this value,...

    Started by Nivv‎, 12-12-2015 08:21 AM
    • Replies: 0
    • Views: 1,061
    12-12-2015, 08:21 AM Go to last post
  19. Enrichment / over-representation of pairs, triplets, quadruples, etc.

    Due to a lack of interest from users for over a month I would like to delete this thread.

    Started by Adam Przedniczek‎, 12-19-2015 04:01 PM
    enrichment, over-representation
    • Replies: 0
    • Views: 887
    12-19-2015, 04:01 PM Go to last post
  20. what does rejecting the hypothesis mean

    Hi, so I'm new to statistics and am not very comfortable with it yet. It may be a very simple question, but I'm finding this very difficult to...

    Started by madhu‎, 12-28-2015 06:34 AM
    hypotheses, hypotheses testing, hypothesis
    • Replies: 0
    • Views: 753
    12-28-2015, 06:34 AM Go to last post
  21. Should I use Bonferroni (or other similar corrections)?

    Hello! I am new in this forum, I have a question and I hope you could help me! :p Suppose that I have to measure 10 independent variables on 60...

    Started by Fischer‎, 01-08-2016 03:57 AM
    • Replies: 0
    • Views: 1,116
    01-08-2016, 03:57 AM Go to last post
  22. What tests should I use when my moderator is discrete?

    Hello everybody, I am currently in the final phase of my master thesis. I have collected my data and I am trying to do my statistical tests, but I...

    Started by willemvw‎, 01-14-2016 10:38 AM
    • Replies: 0
    • Views: 1,006
    01-14-2016, 10:38 AM Go to last post
  23. Lightbulb Using standard deviation on two mean values of two different instruments

    Hi all, I'm making a research and doing a final data analysis. The research was undertaken using a questionnaire and then structured interviews....

    Started by oraclepilot‎, 01-14-2016 01:49 PM
    • Replies: 0
    • Views: 625
    01-14-2016, 01:49 PM Go to last post
  24. How do i analyze the following results statistically?

    In an animal experiment study, efficacy/preference of an energy drink was compared against the individual compounds present in it. 3 groups were...

    Started by mrgb‎, 01-24-2016 10:34 PM
    statistical analysis, statistical research
    • Replies: 0
    • Views: 947
    01-24-2016, 10:34 PM Go to last post
  25. Unhappy Question about type of research

    Hello guys!:) I wonder whether anyone of you who is killing in statistics could give an advice. I am writing my master thesis at the moment. The...

    Started by Lisa92‎, 01-30-2016 11:30 AM
    research, research design, significance testing, significant, statisics
    • Replies: 0
    • Views: 1,115
    01-30-2016, 11:30 AM Go to last post
  26. Recognition of multiple spacial patterns

    Hello! I am looking for some nifty techniques or methods to help me gather elements of a set which are compatible with a base pattern. The set...

    Started by DrGob‎, 01-31-2016 07:42 AM
    • Replies: 0
    • Views: 1,011
    01-31-2016, 07:42 AM Go to last post
  27. Smile Question concerning an "unusual" research design

    Hey everyone, I have a question concerning a between group research-design and I wonder if it is very wise since I never came across a similar...

    Started by mike_88‎, 02-04-2016 03:11 PM
    dependent variables, design
    • Replies: 0
    • Views: 1,191
    02-04-2016, 03:11 PM Go to last post
  28. Questions on data complexity beyond my stats knowledge: what stats tests to use?

    Hi everyone, sorry for this long post. I tried to be detailed, but if anything is unclear, please let me know. I consulted two stats friends for help...

    Started by Rosslady‎, 02-09-2016 11:02 PM
    • Replies: 0
    • Views: 1,016
    02-09-2016, 11:02 PM Go to last post
  29. SPSS-Uneven Sample Size and choice of analysis for two fixed factors with 4 variables

    Hi All, I have a dilemma that I have been trying to find the answers myself but cant seem to find anything to solve my problem. I have...

    Started by playdium‎, 02-10-2016 02:19 AM
    biology, scientific analysis, spss, uneven samples
    • Replies: 0
    • Views: 986
    02-10-2016, 02:19 AM Go to last post
  30. Structural Model & Fit Indices

    I am new to the statistical area. I have a test that uses a Structural Model that is used to test the causal hypothesis between independent variables...

    Started by newstats09‎, 02-11-2016 12:56 AM
    • Replies: 0
    • Views: 955
    02-11-2016, 12:56 AM Go to last post
  31. Cool question about change in period

    Hello guys:) I wonder whether you can help me. I do not know which analysis i can use. My aim is to prove or not the following hypothesis: ...

    Started by Lisa92‎, 02-12-2016 07:10 PM
    research, statisitcs
    • Replies: 0
    • Views: 843
    02-12-2016, 07:10 PM Go to last post
  32. Need a methodology to predict car sales from various showrooms in a district

    Data Assumptions: The sales on a particular day is always 60 There are 3 showrooms in the district There are other factors too(I have omitted the...

    Started by simplequestions‎, 04-19-2016 04:44 AM
    methodology
    • Replies: 0
    • Views: 1,043
    04-19-2016, 04:44 AM Go to last post
  33. Significance test for 13 dichotomous DVs?

    I am studying unprofessional conduct. I have every case of misconduct over a 5-year period. I am curious if misconduct varies by education level. ...

    Started by ddb01‎, 02-18-2016 12:34 PM
    binary dependent variable, chi sq, cochran's q test, non parametric, significance test
    • Replies: 0
    • Views: 1,265
    02-18-2016, 12:34 PM Go to last post
  34. Lightbulb Data Analysis visualization

    Hi Everyone, Lately I have been searching a data analyzer tool/software, which would also present my data in a better way. I came across DataPlay...

    Started by john-rose‎, 02-26-2016 03:07 AM
    analyze, data, presentation, research, visual
    • Replies: 0
    • Views: 1,050
    02-26-2016, 03:07 AM Go to last post
  35. Which test to use for these variables and their associations

    Hey, I have some questions about which test I can or have to use. Which test do I use to only identify if there is a relationship between those...

    Started by MasterStudent‎, 03-01-2016 08:29 AM
    anova, association, chi square, kruskal-wallis anova
    • Replies: 0
    • Views: 806
    03-01-2016, 08:29 AM Go to last post
  36. Power and sample size calculation for neuroscience

    Dear TalkStats, I have searched the forum but cannot find the answer I am looking for, if you could help that would be great! I am recording...

    Started by lb5962‎, 03-09-2016 04:45 AM
    power alpha sample size, research design, research methods, sample size
    • Replies: 0
    • Views: 1,574
    03-09-2016, 04:45 AM Go to last post
  37. Kendall's tau-c testing significance

    Hi! I'm very new with statistical research and I need a simple explanation how to test is my correlation what I have with my Kendall's tau-c test...

    Started by Ultimate‎, 03-11-2016 01:39 PM
    • Replies: 0
    • Views: 1,562
    03-11-2016, 01:39 PM Go to last post
  38. estimate a range of measures

    Hello everyone, I am a statistics student, I'm studying for a project in my University. I have to analyze the data, I have available the measures in...

    Started by andrew_fg‎, 03-12-2016 05:41 AM
    biostatistics, estimate, measurement
    • Replies: 0
    • Views: 1,006
    03-12-2016, 05:41 AM Go to last post
  39. Do i use an ANCOVA for a cross over of exams, pre/post study?

    I have a study i am running and would like to know the appropriate test to apply, its complicated but bear with me :) Background: We are looking...

    Started by Damo123‎, 03-24-2016 12:35 PM
    ancova
    • Replies: 0
    • Views: 2,896
    03-24-2016, 12:35 PM Go to last post
  40. Reliability in observational research

    Hi, everybody I am currently writing my master's degree. In relation to this I have come across a problem regarding reliability in two of my...

    Started by Karl90‎, 03-15-2016 02:24 PM
    • Replies: 0
    • Views: 1,835
    03-15-2016, 02:24 PM Go to last post
  41. Problem with the reliability analysis and factor analysis.

    Hi, As I am working on the statistical research for my graduation, I encountered two problems; 1) I am measuring two multi-dimensional...

    Started by K.Groen‎, 03-17-2016 08:45 AM
    cronbach's alpha, factoranalysis, reliability analysis
    • Replies: 0
    • Views: 1,019
    03-17-2016, 08:45 AM Go to last post
  42. Anova or t-test on squared errors

    I have two forecasting models, moving average and single exponential smoothing. The values of Mean Absolute Percentage Error (MAPE) is 5.2%, 5.8%....

    Started by Mukund‎, 03-16-2016 05:13 AM
    anova, t-test
    • Replies: 0
    • Views: 1,396
    03-16-2016, 05:13 AM Go to last post
  43. Question on the merits of mediation analysis Vs another analysis (described within)

    Hello, I have a dataset involving an intervention (placebo versus real) - denoted as X, an outcome (Y), and a physiological variable (M) that I...

    Started by Siobh‎, 04-05-2016 07:40 AM
    correlation, intervention-analysis, mediation analysis, regression
    • Replies: 0
    • Views: 1,361
    04-05-2016, 07:40 AM Go to last post
  44. standardize by population density

    I have a variable called "number of events" for each state. It is a raw number of event that happened during a specific time frame. I was thinking I...

    Started by grayskillen‎, 04-11-2016 09:57 AM
    population, rates, standardization
    • Replies: 0
    • Views: 597
    04-11-2016, 09:57 AM Go to last post
  45. How can I analyse this data is the best way possible?

    How can I investigate the theory that a relationship between two variables, X and Y is 'Y in proportion to X^3/4' within a population where I can...

    Started by Amritanar‎, 04-17-2016 04:46 AM
    • Replies: 0
    • Views: 865
    04-17-2016, 04:46 AM Go to last post
  46. Policy chance analysis - time series count data

    Hi, I need some help to determine my approach. For a school project I would like to examine the effect of a policy change in the Danish...

    Started by flickerbrood‎, 04-18-2016 07:01 AM
    count data, statistical analysis, time series
    • Replies: 0
    • Views: 921
    04-18-2016, 07:01 AM Go to last post
  47. How to apply Chi Squared test according to this Simulation?

    Hi there, I have been wondering about some points of Chi squared test. I would like to introduce the following scenario to better clarify my...

    Started by pelluzi‎, 04-19-2016 04:24 PM
    anova, chi sq test, chi square test, chi squared
    • Replies: 0
    • Views: 905
    04-19-2016, 04:24 PM Go to last post
  48. Standard deviation

    I have a population of 229, the mean is 20.8 and the standard deviation is 24.6. What can be concluded from this? Is this significant?

    Started by Damara‎, 04-19-2016 05:21 PM
    • Replies: 0
    • Views: 1,237
    04-19-2016, 05:21 PM Go to last post
  49. Staff performance comparison between staff and overall metric

    "Age Group" "Members in 2015" "Complaints in (2015)" "Staff 1 Members in 2016" "Staff 1 Complaints in 2016" "Staff 2 Members in 2016" "Staff 2...

    Started by venky80‎, 04-22-2016 11:25 AM
    • Replies: 0
    • Views: 1,516
    04-22-2016, 11:25 AM Go to last post
  50. Need help for an analysis

    Hi I'm working in a textile company that have stores in many countries.While planning quantities of product,we are considering of product display...

    Started by munire‎, 04-27-2016 02:26 PM
    • Replies: 0
    • Views: 1,307
    04-27-2016, 02:26 PM Go to last post
  51. Average height of population

    I am trying to figure out how many samples to take from known population to be accurate within 95%. For example to find average height and...

    Started by mike121‎, 04-28-2016 08:56 PM
    • Replies: 0
    • Views: 791
    04-28-2016, 08:56 PM Go to last post
  52. Threshold Autoregressive (TAR) Model with exogenous variables (TARX)

    Anyone have experience with these models? From what I remember about VAR is that adding exogenous variables to model a VARX is straightforward....

    Started by ELMST‎, 05-02-2016 07:42 PM
    tar, tarx, var, varx
    • Replies: 0
    • Views: 794
    05-02-2016, 07:42 PM Go to last post
  53. Randomised Complete Block Design (RCBD)

    During the cotton-spinning process, a strand of cotton thicker than the final thread is produced, and then twisted before it is wound onto a bobbin....

    Started by eunkum‎, 05-03-2016 01:36 PM
    • Replies: 0
    • Views: 1,098
    05-03-2016, 01:36 PM Go to last post
  54. Difference between expected spending and observed spending. What kind of statistical

    I would like some advice from you about what kind of statistical analysis I could do about that data. My case is as follows: According to a...

    Started by pelluzi‎, 05-04-2016 12:02 AM
    anova, chi sq, chi square, f-test, hyposteses testing
    • Replies: 0
    • Views: 2,178
    05-04-2016, 12:02 AM Go to last post
  55. Problem in Structural Breaks

    Suppose, if I draw samples of different sizes at time t=1,2,..,T,T+1,..,2T where the sample sizes could be different and the observed variable is a...

    Started by abhic_1983‎, 05-10-2016 12:17 AM
    bai-perron test, shapiro wilk, structural breaks
    • Replies: 0
    • Views: 1,107
    05-10-2016, 12:17 AM Go to last post
  56. Smile [SPSS - Hypothesis testing] Controlling for a variable. ANCOVA?

    Hi! I am using open data from New York City's yellow cabs and the in 2013 introduced citibikes (bikesharing service) to see if the introduction of...

    Started by dippedinice‎, 05-12-2016 03:18 PM
    hypothesis testing, spss
    • Replies: 0
    • Views: 652
    05-12-2016, 03:18 PM Go to last post
  57. Standard error of measurement (SEM) consistency - what's the formula?

    Hello, everyone How to calculate the standard error of measurement (SEM) but for consistency? I would like to find the formula and the paper which...

    Started by Rod_py‎, 05-13-2016 11:47 AM
    reliability analysis
    • Replies: 0
    • Views: 755
    05-13-2016, 11:47 AM Go to last post
  58. Suggest a research design.

    I am currently doing research assignment which is to design a program evaluation and need to seek advise on some research questions. As a person...

    Started by jackfood‎, 05-17-2016 08:54 AM
    • Replies: 0
    • Views: 527
    05-17-2016, 08:54 AM Go to last post
  59. How to apply syntax to specific data?

    Hi there - I need to convert some raw data into categories via a calculation which turns the raw data into angles (to establish specific groups). I...

    Started by littleone‎, 05-17-2016 09:50 AM
    • Replies: 0
    • Views: 938
    05-17-2016, 09:50 AM Go to last post
  60. Chi-square instead of Multiple Regression Analysis

    Can someone help me? How can I explain that I used Chi-square test of association instead of Multiple Linear Regression Analysis because I had...

    Started by choco21lit‎, 05-21-2016 11:45 AM
    • Replies: 0
    • Views: 871
    05-21-2016, 11:45 AM Go to last post

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