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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: 19,375
    10-11-2014, 12:02 PM Go to last post
  1. 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: 2,310
    06-23-2016, 03:08 AM Go to last post
  2. 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 01:47 PM
    • Replies: 9
    • Views: 18,468
    06-22-2016, 03:37 AM Go to last post
  3. 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: 904
    06-21-2016, 04:40 PM Go to last post
  4. 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: 1,725
    06-21-2016, 06:17 AM Go to last post
  5. 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: 1,172
    06-20-2016, 01:46 PM Go to last post
  6. 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: 1,386
    06-19-2016, 03:38 AM Go to last post
  7. 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: 2,506
    06-16-2016, 08:05 AM Go to last post
  8. 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: 2,552
    06-15-2016, 01:34 PM Go to last post
  9. 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: 2,945
    06-14-2016, 11:05 PM Go to last post
  10. 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: 1,049
    06-14-2016, 04:27 AM Go to last post
  11. 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: 1,110
    06-13-2016, 11:37 AM Go to last post
  12. 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: 833
    06-09-2016, 09:38 AM Go to last post
  13. 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: 2,238
    06-09-2016, 02:34 AM Go to last post
  14. 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: 1,628
    06-07-2016, 01:12 PM Go to last post
  15. 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: 1,750
    06-07-2016, 08:22 AM Go to last post
  16. 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: 1,787
    06-05-2016, 12:40 AM Go to last post
  17. 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 04:33 PM
    2 Pages
    1 2
    • Replies: 17
    • Views: 43,730
    06-03-2016, 10:10 PM Go to last post
  18. 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: 1,914
    06-02-2016, 02:38 PM Go to last post
  19. 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: 1,804
    06-01-2016, 11:03 PM Go to last post
  20. 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: 1,198
    05-31-2016, 04:22 AM Go to last post
  21. 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: 999
    05-26-2016, 01:32 PM Go to last post
  22. 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: 2,129
    05-25-2016, 02:48 PM Go to last post
  23. 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: 521
    05-25-2016, 11:27 AM Go to last post
  24. 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: 762
    05-25-2016, 03:49 AM Go to last post
  25. 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: 1,478
    05-22-2016, 07:15 AM Go to last post
  26. 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: 912
    05-21-2016, 11:45 AM Go to last post
  27. 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: 963
    05-17-2016, 09:50 AM Go to last post
  28. 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: 556
    05-17-2016, 08:54 AM Go to last post
  29. 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: 783
    05-13-2016, 11:47 AM Go to last post
  30. 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: 676
    05-12-2016, 03:18 PM Go to last post
  31. 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: 1,987
    05-12-2016, 10:00 AM Go to last post
  32. 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: 1,215
    05-12-2016, 06:13 AM Go to last post
  33. 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: 1,173
    05-11-2016, 02:03 AM Go to last post
  34. 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: 1,157
    05-10-2016, 12:17 AM Go to last post
  35. 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: 2,308
    05-04-2016, 12:02 AM Go to last post
  36. 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: 1,211
    05-03-2016, 01:36 PM Go to last post
  37. 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: 831
    05-02-2016, 07:42 PM Go to last post
  38. 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: 833
    04-28-2016, 08:56 PM Go to last post
  39. 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: 1,614
    04-27-2016, 07:47 PM Go to last post
  40. 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: 1,346
    04-27-2016, 02:26 PM Go to last post
  41. 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: 895
    04-27-2016, 04:50 AM Go to last post
  42. 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: 1,628
    04-22-2016, 11:25 AM Go to last post
  43. 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: 1,284
    04-19-2016, 05:21 PM Go to last post
  44. 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: 952
    04-19-2016, 04:24 PM Go to last post
  45. 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: 1,090
    04-19-2016, 04:44 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: 979
    04-18-2016, 07:01 AM Go to last post
  47. 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: 1,522
    04-18-2016, 01:48 AM Go to last post
  48. 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: 915
    04-17-2016, 04:46 AM Go to last post
  49. 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 10:52 AM
    difference, proportion, significance, time series
    • Replies: 3
    • Views: 2,257
    04-15-2016, 02:15 AM Go to last post
  50. 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 07:19 PM
    • Replies: 4
    • Views: 2,640
    04-13-2016, 04:04 PM Go to last post
  51. 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: 1,707
    04-13-2016, 03:49 PM Go to last post
  52. 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: 626
    04-11-2016, 09:57 AM Go to last post
  53. 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: 1,423
    04-05-2016, 07:40 AM Go to last post
  54. 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: 1,713
    03-31-2016, 11:58 AM Go to last post
  55. 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: 854
    03-29-2016, 08:03 AM Go to last post
  56. 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: 1,314
    03-28-2016, 01:22 PM Go to last post
  57. 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: 2,999
    03-24-2016, 12:35 PM Go to last post
  58. 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: 3,673
    03-24-2016, 07:42 AM Go to last post
  59. 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: 2,056
    03-22-2016, 11:40 AM Go to last post
  60. 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: 1,739
    03-21-2016, 03:18 AM Go to last post

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