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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: 6,581
    10-11-2014, 12:02 PM Go to last post
  1. Question Is it right to estimate the mean of scores obtained from Factor Analysis?

    Hi Everyone :) I appreciate any comment about this question: Does it make sense to use the score obtained from a factor analysis to estimate the...

    Started by IsaMolly‎, 07-24-2016 09:48 PM
    • Replies: 5
    • Views: 157
    07-25-2016, 09:42 PM Go to last post
  2. Studies Quality Assesment: interpreted univariate analysis, adjusted for confounding?

    Hello, I am conducting a systematic review on mostly cohort studies. One part of my quality assessment is of course; if the observational study...

    Started by FlorenziH‎, 07-25-2016 08:35 AM
    systematic review
    • Replies: 0
    • Views: 79
    07-25-2016, 08:35 AM Go to last post
  3. Good sources (books, articles, ....) on the history of Monte Carlo methods?

    I am finally entering the final step of my PhD. Chapter 1 of my dissertation has already been published, Chapter 2 has been submitted for publication...

    Started by spunky‎, 07-21-2016 02:54 PM
    monte carlo, multivariate
    • Replies: 4
    • Views: 261
    07-22-2016, 05:38 AM Go to last post
  4. Bivariate Contour Ellipse Area

    I have found a research paper, where there is need to calculate the area of a bivariate contour ellipse. I am familiar with drawing a confidence...

    Started by m1chael‎, 07-21-2016 07:25 AM
    • Replies: 0
    • Views: 127
    07-21-2016, 07:25 AM Go to last post
  5. Correct statistical test to compare multiple rates

    Hi, I am trying to determine whether the risk of dying on any one day is higher than other days for patients in hospital. I have calculated the...

    Started by CE479‎, 07-20-2016 03:38 PM
    compare risk multiple
    • Replies: 0
    • Views: 85
    07-20-2016, 03:38 PM Go to last post
  6. Unbalanced samples

    Hi! I want to compare between two sample, but they have non equivalent means between demographic parameters such as age and more. What do you...

    Started by Hadar‎, 07-18-2016 06:21 AM
    • Replies: 1
    • Views: 140
    07-18-2016, 08:12 AM Go to last post
  7. Estimating the number of cases (sample size)

    Hi there! I've a perhaps simple question: how can I estimate the number of measurements (cases) to obtain a accurate result? Here an example:...

    Started by unknown‎, 07-17-2016 08:10 AM
    • Replies: 6
    • Views: 185
    07-17-2016, 11:00 PM Go to last post
  8. Multiple Measures (Different Variables) from Same Subjects

    Hi all! This is my first post. I hope someone can offer advice! I have a student with a seemingly simple analytical problem but I cannot...

    Started by bashinsk‎, 07-17-2016 10:25 AM
    • Replies: 2
    • Views: 89
    07-17-2016, 10:44 AM Go to last post
  9. Repeated measures - Within/Between explained

    Hey guys, I'm having troubles understanding my analysis. I have patients going through pulmonary functions test every 2 weeks in 5 different time...

    Started by XPeriment‎, 06-24-2016 12:24 AM
    • Replies: 3
    • Views: 280
    07-16-2016, 08:58 AM Go to last post
  10. Dealing with missing values in cluster analysis

    I am currently looking for a cluster algorithm to deal with a large amount of systematically missing values. In particular, I need to cluster...

    Started by fabiangmueller‎, 07-15-2016 05:04 PM
    • Replies: 5
    • Views: 195
    07-16-2016, 06:53 AM Go to last post
  11. Bonferroni correction (significance level and CI)

    Hi there, I need another advice. I'm dealing with the problem of multiple testing and I was planning to use Bonferroni correction. Because I...

    Started by Jeremiah‎, 07-14-2016 05:38 AM
    • Replies: 1
    • Views: 164
    07-14-2016, 07:53 AM Go to last post
  12. Goodness of fit test for categorical data with non-negative real numbersca

    An experiment that I conduct has 5 outcomes: A, B, C and D. I conduct 12 trials for this experiment. I observe, for example: Outcome : Frequency...

    Started by bakwas‎, 06-30-2016 09:48 AM
    categorical data, chi-square test, fishers exact, goodness-of-fit, model comparison
    • Replies: 2
    • Views: 245
    07-14-2016, 01:13 AM Go to last post
  13. What happens after Content Analysis and Cohen's Kappa?

    Hi I have 2 raters for content analysis and have a satisfactory score for Cohen's Kappa (0.805). Can I use either raters' values for analysis or...

    Started by MazOz‎, 07-13-2016 10:23 PM
    cohen's kappa, content analysis
    • Replies: 1
    • Views: 100
    07-14-2016, 01:09 AM Go to last post
  14. Re: what is the best test

    Dear all, I am analysing the data set with two independent variables (syntax, position), two levels each, affecting children's performance on the...

    Started by Eva Edel‎, 07-09-2016 05:45 PM
    • Replies: 1
    • Views: 123
    07-14-2016, 01:08 AM Go to last post
  15. Discrete or Continuous Data and Effect Size

    Dear All, I have a paper with baseline (expressed as median and IQR) and change scores at 12 months (mean, 95%CI) regarding the number of days per...

    Started by Pedro's PhD‎, 07-12-2016 02:47 PM
    • Replies: 0
    • Views: 119
    07-12-2016, 02:47 PM Go to last post
  16. what is the best test

    Hello! I'm not the best at statistics. I understand the theory but I am still uncertain about choosing the appropriate test. I am doing a study...

    Started by Soso13‎, 07-09-2016 01:28 PM
    • Replies: 1
    • Views: 220
    07-09-2016, 04:38 PM Go to last post
  17. 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: 250
    07-08-2016, 11:23 AM Go to last post
  18. Model vs. test

    Hi, we just had an interesting discussion about the chi-squared test, that could be generalized. I think the core of the discussion was whether one...

    Started by rogojel‎, 07-03-2016 02:23 AM
    regression model, statistical test
    • Replies: 1
    • Views: 233
    07-07-2016, 09:32 AM Go to last post
  19. Identifying the right way to establish correlations between different topics

    I have multiple topics each with hundreds of questions and different students submitting responses to these questions. What is the best way to...

    Started by sasank‎, 07-02-2016 03:56 AM
    • Replies: 0
    • Views: 149
    07-02-2016, 03:56 AM Go to last post
  20. Poisson process

    Dear statisticians, I have a question that is of great importance for my master thesis in insurance science. I have obtained a dataset that...

    Started by kulstudent‎, 07-01-2016 06:51 AM
    poisson
    • Replies: 2
    • Views: 187
    07-01-2016, 02:08 PM Go to last post
  21. Question Which interrater reliability test to chose and how to set up the data matrix?

    I have a question regarding which interrater reliability test I should use. The situation is as follows: 12 judges rated 20 profiles with 14...

    Started by Maartenth‎, 07-01-2016 04:24 AM
    interrater reliability
    • Replies: 0
    • Views: 112
    07-01-2016, 04:24 AM Go to last post
  22. Analyzing Likert Scale Data Using Statistical Tools

    Hi everyone, I'm doing an MBA dissertation on the topic "Impact of Customer Service Satisfaction on Business Performance". The hypothesis set is...

    Started by Sahar04‎, 06-24-2016 05:22 AM
    • Replies: 3
    • Views: 447
    06-29-2016, 01:50 AM Go to last post
  23. Gamma distribution

    Hi, If I have three independent variables that all follow the gamma distribution, what distribution will then sum of these variables follow? ...

    Started by samot79‎, 06-28-2016 02:56 AM
    gamma distribution
    • Replies: 0
    • Views: 153
    06-28-2016, 02:56 AM Go to last post
  24. Unhappy How i can analyse two questionnaires to find the Reliability Coefficient

    I am working on a project in which i am comparing Public and Private schools performance for that I have to compare the data on SPSS to find the...

    Started by hafsa‎, 06-26-2016 04:35 PM
    spss
    • Replies: 0
    • Views: 190
    06-26-2016, 04:35 PM Go to last post
  25. What model - combining data

    Hi, I have attached a data file which shows 4 ways of describing the same thing. Each way is a small table of 5 numbers. If I explain whats...

    Started by models‎, 06-20-2016 05:32 AM
    • Replies: 2
    • Views: 236
    06-23-2016, 03:08 AM Go to last post
  26. Model Fit is Too Perfect: RMSEA & CFI are perfect; SRMR varies in invariance analyses

    I am running models looking at the fit of new self-report scale I have developed (CFA and measurement invariance by a number of different categories...

    Started by mem162000‎, 01-15-2014 12:47 PM
    • Replies: 9
    • Views: 6,034
    06-22-2016, 03:37 AM Go to last post
  27. Using Factor Scores in Discriminant Analysis

    I am doing research on whether corporations that engage in earnings fraud can be identified up to three years before the fraud occurs. My end result...

    Started by ceilylou‎, 06-21-2016 01:05 PM
    discriminant analisys, factor analyses
    • Replies: 3
    • Views: 178
    06-21-2016, 04:40 PM Go to last post
  28. Which method? Categorical data (IV) and continuous numerical data (DV)

    Thanks in advance for taking a look at my query I have been trying to get some statistical support from my local research department but I am...

    Started by dwilding‎, 06-21-2016 06:17 AM
    categorical data, kruskal-wallis, logistical regresion, one way anova, regression
    • Replies: 0
    • Views: 165
    06-21-2016, 06:17 AM Go to last post
  29. Percent From The Critical Value

    Afternoon, Here is one I haven't experienced before and haven't seen discussed: I have a series of goodness-of-fit tests using chi-square a few...

    Started by c4sadler‎, 06-20-2016 01:46 PM
    • Replies: 0
    • Views: 215
    06-20-2016, 01:46 PM Go to last post
  30. Genes comparison in SPSS

    Hey guys, I have an excel sheet I imported to SPSS all the rows are genes (over 3200), and for each gene I have its expression level in 6...

    Started by XPeriment‎, 06-18-2016 11:30 PM
    • Replies: 1
    • Views: 210
    06-19-2016, 03:38 AM Go to last post
  31. Population Estimation

    Hello, new member here and I've been looking for a way to make a number cruncher for a (imaginary) colony of creatures for an RP I'm making. I'm...

    Started by ravni‎, 06-15-2016 07:59 AM
    population modeling, population statistics
    • Replies: 6
    • Views: 978
    06-16-2016, 08:05 AM Go to last post
  32. Welch ANOVA and covariates

    I had planned, because of lack of homogeneity of variance for some of my variables (homoscedasticity) to run a Welch's ANOVA and to use...

    Started by lsrms3‎, 06-15-2016 01:34 PM
    ancova, anova, covariate, covariates, welch
    • Replies: 0
    • Views: 195
    06-15-2016, 01:34 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: 964
    06-14-2016, 11:05 PM Go to last post
  34. large cell counts - Fisher's Exact vs. chi2

    Hi everyone, I read a while back that chi2 was most accurate for observed cell counts of only between 5-70, but now I can't find that reference. I'm...

    Started by DrStatman‎, 06-09-2016 10:54 PM
    chi-squared, exact test
    • Replies: 2
    • Views: 366
    06-14-2016, 04:27 AM Go to last post
  35. Estimation of suitable significance level for high numbers of experiments

    I am a scientist and work with high numbers of experiments. For example: I have tested 1000 different parameters between 2 groups. I found 10...

    Started by AntonS1988‎, 06-13-2016 11:37 AM
    binomial, experiment, false positive, high numbers, significance level
    • Replies: 0
    • Views: 169
    06-13-2016, 11:37 AM Go to last post
  36. ttest for comparison of group means from pooled samples

    Hello, I have results from an experiment where a number (n=50) of biological samples were pooled together with a single measurement of chemical...

    Started by edfromdetroit‎, 06-09-2016 09:38 AM
    aggregate data, pooled samples, ttest
    • Replies: 0
    • Views: 179
    06-09-2016, 09:38 AM Go to last post
  37. Which Non-parametric Significance Test Should I Use?

    Hi, I've been working on a little project. Last year I delivered pizzas. I recorded data for 300 of my deliveries like tip amounts, order totals,...

    Started by 13gentj‎, 06-07-2016 08:36 PM
    exact test, fail assumptions, non-normal, permutation test, randomization test
    • Replies: 5
    • Views: 320
    06-09-2016, 02:34 AM Go to last post
  38. Compound poisson gamma model and biomass data

    I have some biomass data (total count -discrete- of individuals and total dry weight -continuous-) that I would like to model with environmental...

    Started by Nono75‎, 06-07-2016 09:26 AM
    data analysis, modeling techniques
    • Replies: 1
    • Views: 174
    06-07-2016, 01:12 PM Go to last post
  39. Census data: Should I worry about sample size and pvalues?

    Hi all, I have a questions regarding statistical power and sample size. (1) Do I have to worry about sample size in a multiple logistic regression...

    Started by Marvin85‎, 06-03-2016 03:51 PM
    census data, logistic, sample size, statistical power
    • Replies: 6
    • Views: 400
    06-07-2016, 08:22 AM Go to last post
  40. Considering Skewness and Kurtosis

    Hello All, With test data the parameters were created for mean, standard deviation and the two other moments. I then take look at samples one at...

    Started by mike121‎, 06-05-2016 12:40 AM
    • Replies: 0
    • Views: 214
    06-05-2016, 12:40 AM Go to last post
  41. Generating Skewed Normal Distributions

    I want to generate Random Normal Distributions with specific degrees of Skewness and Kurtosis. So far I have looked at the following two approaches:...

    Started by kanny_g‎, 02-04-2009 03:33 PM
    2 Pages
    1 2
    • Replies: 17
    • Views: 27,530
    06-03-2016, 10:10 PM Go to last post
  42. a completely randomized experimental design and regression

    A company studied the effects of three different methods of promotions on sales of its crackers (labeled as Treatment 1 to 3). Fifteen stores were...

    Started by eunkum‎, 06-02-2016 10:54 AM
    regression
    • Replies: 1
    • Views: 229
    06-02-2016, 02:38 PM Go to last post
  43. Need Help on Method Analysis

    Hi, i am currently doing a research for my project and it requires me to use statistical analysis to validate the data. I am not sure on which method...

    Started by arezeem‎, 06-01-2016 11:03 PM
    • Replies: 0
    • Views: 218
    06-01-2016, 11:03 PM Go to last post
  44. 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, 05-30-2016 08:50 AM
    • Replies: 1
    • Views: 257
    05-31-2016, 04:22 AM Go to last post
  45. 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: 289
    05-26-2016, 01:32 PM Go to last post
  46. 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: 939
    05-25-2016, 02:48 PM Go to last post
  47. 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: 166
    05-25-2016, 11:27 AM Go to last post
  48. 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: 180
    05-25-2016, 03:49 AM Go to last post
  49. 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: 350
    05-22-2016, 07:15 AM Go to last post
  50. 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: 209
    05-21-2016, 11:45 AM Go to last post
  51. 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: 214
    05-17-2016, 09:50 AM Go to last post
  52. 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: 170
    05-17-2016, 08:54 AM Go to last post
  53. 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: 198
    05-13-2016, 11:47 AM Go to last post
  54. 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: 192
    05-12-2016, 03:18 PM Go to last post
  55. 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: 317
    05-12-2016, 10:00 AM Go to last post
  56. 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: 168
    05-12-2016, 06:13 AM Go to last post
  57. 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: 226
    05-11-2016, 02:03 AM Go to last post
  58. 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: 199
    05-10-2016, 12:17 AM Go to last post
  59. 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: 584
    05-04-2016, 12:02 AM Go to last post
  60. 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: 230
    05-03-2016, 01:36 PM Go to last post

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