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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 03:56 AM
    • Replies: 14
    • Views: 5,940
    10-11-2014, 12:02 PM Go to last post
  1. Need help with Power Analysis

    Hello, i am performing Welch's Anova as my data lack homegeneity, and post hoc testing with Games Howell. My problem is that i cannot find power for...

    Started by m1chael‎, Today 08:50 AM
    • Replies: 0
    • Views: 44
    Today, 08:50 AM Go to last post
  2. Need help with power analysis GPower Novice

    Hello everyone. I am doing a power test for Fishers Exact Test on GPower, and dont know how to determine the proportions p1 and p2. I have 2...

    Started by ANCOVA'D‎, 05-26-2016 01:32 PM
    power calculation, sample size
    • Replies: 0
    • Views: 116
    05-26-2016, 01:32 PM Go to last post
  3. Necessary condition analysis

    Hi, I have a research problem where I have to identify a necessary condition. I have three data series, X, Y, Z. say, Z is the dependent variable and...

    Started by fellow‎, 05-15-2012 12:09 AM
    necessary condition, sufficient condition
    • Replies: 1
    • Views: 769
    05-25-2016, 02:48 PM Go to last post
  4. Suggest me a test

    im doing a thesis titled 'Impact of banning smartphone on employee engagement on next generation employees' h0: banning smartphone has no such...

    Started by taify‎, 05-25-2016 11:27 AM
    • Replies: 0
    • Views: 85
    05-25-2016, 11:27 AM Go to last post
  5. help needed with Fishers Exact Test (power calculation)

    Hello everyone. Hope someone can help me. I am running a Fisher exact 4 X 2 table analysis in SPSS. I have been informed its the correct test to...

    Started by ANCOVA'D‎, 05-25-2016 03:49 AM
    chi square, fishers exact, power analysis, power calculation
    • Replies: 0
    • Views: 89
    05-25-2016, 03:49 AM Go to last post
  6. Appropriate test for quantitative content analysis of one newspaper

    Hi everyone, I am examining the differences in media coverage of homicide on the basis of the religion of the victim (bias). The sample is one...

    Started by Mikkey‎, 05-19-2016 07:55 PM
    content analysis, dependent, independent, methodology, t-test
    • Replies: 4
    • Views: 227
    05-22-2016, 07:15 AM Go to last post
  7. 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: 105
    05-21-2016, 11:45 AM Go to last post
  8. 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: 137
    05-17-2016, 09:50 AM Go to last post
  9. 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: 90
    05-17-2016, 08:54 AM Go to last post
  10. 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: 116
    05-13-2016, 11:47 AM Go to last post
  11. 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: 105
    05-12-2016, 03:18 PM Go to last post
  12. Pre and Post with Treatment group - ANOVA , ANCOVA, Regress differences???

    Hello friends, My main task is to "test" if staff member who participated in the counseling sessions had fewer "Use of Force (UOF)" incidents in...

    Started by Marvin85‎, 05-11-2016 11:19 AM
    ancova, anova, pre post
    • Replies: 4
    • Views: 221
    05-12-2016, 10:00 AM Go to last post
  13. How to perform reverse score transformations? (non-normal data)

    Hello, Sadly, my data are significantly non-normal, negatively and not positively skewed, so that leaves me, according to some statisticians, with...

    Started by biancaelenai‎, 05-12-2016 03:54 AM
    data transformation, non-normality, skewness
    • Replies: 1
    • Views: 91
    05-12-2016, 06:13 AM Go to last post
  14. Evaluation of Bayesian Model

    How can I evaluate if a created bayesian model is reliable model that makes good predication? To conclude if the created bayesian model produces a...

    Started by ozkan‎, 05-09-2016 05:41 AM
    bayesian, reliability
    • Replies: 1
    • Views: 155
    05-11-2016, 02:03 AM Go to last post
  15. 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: 122
    05-10-2016, 12:17 AM Go to last post
  16. 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: 285
    05-04-2016, 12:02 AM Go to last post
  17. 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: 162
    05-03-2016, 01:36 PM Go to last post
  18. 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: 118
    05-02-2016, 07:42 PM Go to last post
  19. 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: 228
    04-28-2016, 08:56 PM Go to last post
  20. chi square test to test difference for 5x2

    My data has two groups people, VV and NV, and I want to test the difference in their occupation. The occupation were 5 groups: farm/fh, farmer/fh,...

    Started by fengyuwuzu‎, 04-27-2016 07:04 PM
    • Replies: 1
    • Views: 206
    04-27-2016, 07:47 PM Go to last post
  21. 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: 124
    04-27-2016, 02:26 PM Go to last post
  22. Post Need help for my data analysis

    Hi, I need help in analysing the data that I have collected for my final year dissertation. Kindly find the data sheet attached. I need to...

    Started by priyankashree‎, 04-27-2016 04:18 AM
    • Replies: 1
    • Views: 141
    04-27-2016, 04:50 AM Go to last post
  23. 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: 275
    04-22-2016, 11:25 AM Go to last post
  24. 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: 259
    04-19-2016, 05:21 PM Go to last post
  25. 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: 114
    04-19-2016, 04:24 PM Go to last post
  26. 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: 118
    04-19-2016, 04:44 AM Go to last post
  27. 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: 145
    04-18-2016, 07:01 AM Go to last post
  28. What statistical test should I use to test for statistical significance?

    Hello fellow members, I haven't been using statistics for a long time and I have trouble recalling statistical tests and their use. I hope you can...

    Started by Tanja.M‎, 04-17-2016 10:27 AM
    • Replies: 1
    • Views: 205
    04-18-2016, 01:48 AM Go to last post
  29. 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: 177
    04-17-2016, 04:46 AM Go to last post
  30. Time Series - Difference over time

    Hello, I'm new in the time series, so I need some help. I have a short time series (5 quarters), with the proportion of a parameter (public...

    Started by wisit‎, 03-08-2016 09:52 AM
    difference, proportion, significance, time series
    • Replies: 3
    • Views: 460
    04-15-2016, 02:15 AM Go to last post
  31. How can I best analyze this data

    I have some data I am trying to analyze but was hoping to get some stats help with it. I'm not sure what the best way to analyze it is. I'm...

    Started by YellowM3‎, 01-24-2016 06:19 PM
    • Replies: 4
    • Views: 522
    04-13-2016, 04:04 PM Go to last post
  32. Talking Should I use a Weighted Average? HELP!

    Hi All - first post here and advanced warning I'm no stats wiz, but need the kind help of y'all. I have a huge dataset I am working with and trying...

    Started by IllegallyUnanalytical‎, 03-29-2016 08:12 PM
    • Replies: 2
    • Views: 327
    04-13-2016, 03:49 PM Go to last post
  33. What model should I use? Mixed-effect model?

    Hello guys, I really hope you can help me with this. Any ideas/suggestions are welcome. My main goal is to create a model that predicts which...

    Started by Marvin85‎, 03-16-2016 02:22 PM
    • Replies: 13
    • Views: 741
    04-12-2016, 04:58 AM Go to last post
  34. 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: 140
    04-11-2016, 09:57 AM Go to last post
  35. 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: 296
    04-05-2016, 07:40 AM Go to last post
  36. Estimating location of lower tail

    Say I have a sample, assumed from a Normal Distribution. I want to find a confidence interval for this parameter: L = \mu - \alpha * \sigma ...

    Started by EdddieB1985‎, 03-31-2016 12:40 AM
    confidence interval, estimation, standard error
    • Replies: 2
    • Views: 377
    03-31-2016, 11:58 AM Go to last post
  37. Talking Clinical Trial - sample size for statistically comparable data?

    Hi Everyone In a nutshell - I am looking to undertake an 8 week clinical trial of an equine veterinary health product. I am wanting to analyse...

    Started by WildlifeStats‎, 03-29-2016 05:25 AM
    clinical trial, placebo, sample size, sample size calculation, sample size determination
    • Replies: 1
    • Views: 186
    03-29-2016, 08:03 AM Go to last post
  38. 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: 207
    03-28-2016, 01:22 PM 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: 434
    03-24-2016, 12:35 PM Go to last post
  40. Confidence Intervals in a research paper

    Hi, all. I'm writing a paper on concussion data from the NFL Surveillance System, and I want to be able to put the data analysis from the journal...

    Started by leafonthewind‎, 03-23-2016 01:13 PM
    confidence intervals, independent events, p value, research article
    • Replies: 3
    • Views: 267
    03-24-2016, 07:42 AM Go to last post
  41. Variance Inflation Factor

    Hej, I am checking for multicollinearity. And I cant find on the web when having the outpur from R commander, on which I have to look to identify...

    Started by MasterStudent‎, 03-10-2016 07:03 AM
    vif
    • Replies: 9
    • Views: 487
    03-23-2016, 12:09 PM Go to last post
  42. Question The null hypothesis

    Hi everybody, I would like to hear from you your suggestions, I would be grateful to your help and thank you in advance for your help. I am a...

    Started by Rachi‎, 03-21-2016 05:50 PM
    • Replies: 2
    • Views: 283
    03-22-2016, 11:40 AM Go to last post
  43. Post Principal component analysis (PCA) on clustered data

    Hi Everyone, I am analysing data about physical condition tests on students belonging to different type of schools (general, professional,...

    Started by AkaKiwi‎, 03-18-2016 10:40 AM
    • Replies: 3
    • Views: 331
    03-21-2016, 03:18 AM Go to last post
  44. Factorial experiment in CRD with unequal replications

    Hi guys, i am a graduate student in statistics. i want to test for the main and interaction effect of 3 treatments on a group of patients. let say...

    Started by skyakash‎, 03-17-2016 12:03 PM
    anova, crd, design of experiments, factorial analysis, unequal replications
    • Replies: 3
    • Views: 272
    03-18-2016, 06:59 AM Go to last post
  45. 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: 160
    03-17-2016, 08:45 AM Go to last post
  46. 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: 183
    03-16-2016, 05:13 AM Go to last post
  47. 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: 226
    03-15-2016, 02:24 PM Go to last post
  48. Models comparison

    I have a time series data of 1000 points for each of the different machines. I tried different forecasting techniques to make a one step prediction....

    Started by Mukund‎, 03-14-2016 12:40 PM
    models comparison
    • Replies: 5
    • Views: 303
    03-15-2016, 06:44 AM Go to last post
  49. Nonparametric for paired, but unequal sample size

    Hi, I'm in the midst of writing my master thesis, but I'm having issues with the statistics. I've measured muscle cells. In short, I've 4...

    Started by Conxile‎, 03-14-2016 04:47 AM
    • Replies: 4
    • Views: 235
    03-14-2016, 10:29 AM Go to last post
  50. 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 02:51 PM
    • Replies: 0
    • Views: 218
    03-12-2016, 02:51 PM Go to last post
  51. 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 04:41 AM
    biostatistics, estimate, measurement
    • Replies: 0
    • Views: 160
    03-12-2016, 04:41 AM Go to last post
  52. 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 12:39 PM
    • Replies: 0
    • Views: 196
    03-11-2016, 12:39 PM Go to last post
  53. 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 03:45 AM
    power alpha sample size, research design, research methods, sample size
    • Replies: 0
    • Views: 248
    03-09-2016, 03:45 AM Go to last post
  54. 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 12:50 PM
    • Replies: 2
    • Views: 319
    03-07-2016, 03:21 PM Go to last post
  55. Question Confidence intervals and effect size for non-parametric tests help

    Hi I am currently carrying out data analysis on SPSS for pre post treatment measures using non-parametric tests, the Wilcoxon signed rank test...

    Started by sineaddw‎, 03-05-2016 09:34 AM
    • Replies: 1
    • Views: 313
    03-05-2016, 09:13 PM Go to last post
  56. Calculating the bias of variance estimator

    Dear all, I have been given two variance (S^2) estimators, S1 and S2. I am not including the square (^2) as it may cause confusion. And I am to...

    Started by UniApply‎, 03-03-2016 01:29 PM
    • Replies: 9
    • Views: 431
    03-03-2016, 09:30 PM Go to last post
  57. test of normality help

    Dear Friends i need help in statistical research paper kindly assist some help thank you.

    Started by malko‎, 03-01-2016 10:12 AM
    • Replies: 4
    • Views: 353
    03-03-2016, 07:02 PM Go to last post
  58. False Coverage Rate - adjusting confidence intervals for multiple comparisons

    Hello, I could do with some help regarding correcting confidence intervals for multiple comparisons. I have carried out a number of multiple...

    Started by Pepper_Plant‎, 03-02-2016 01:38 PM
    confidence intervals, multiple comparisons
    • Replies: 2
    • Views: 278
    03-03-2016, 08:09 AM Go to last post
  59. Interpretation of an AR model

    hi, looking at process times of a rather complex machine I found that an AR(2) model describes it quite well. Does it make sense to interpret this...

    Started by rogojel‎, 03-02-2016 01:56 AM
    ar model, interpretation, time series
    • Replies: 2
    • Views: 219
    03-02-2016, 10:50 AM Go to last post
  60. 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 07:29 AM
    anova, association, chi square, kruskal-wallis anova
    • Replies: 0
    • Views: 200
    03-01-2016, 07:29 AM Go to last post

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