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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: 18,756
    10-11-2014, 12:02 PM Go to last post
  1. Adding Random Variables from Logistic Distributions

    Given two logistic distributed random variable: ( mu_1, s_1 ) and ( mu_2, s_2 ) what is the sum of the variable? I tried monte carlo on (...

    Started by JoeyM‎, 05-12-2010 03:31 PM
    • Replies: 2
    • Views: 8,213
    05-13-2010, 04:36 PM Go to last post
  2. Addressing omitted variable bias in count panel model

    Hello dear forum members, My study aims to address the question about physician ratings: Do they have an impact on the business value (as proxied...

    Started by kiton‎, 06-30-2015 01:04 AM
    count data, negative binomial, panel data
    • Replies: 1
    • Views: 1,365
    07-02-2015, 09:18 AM Go to last post
  3. Adequate sample sizes for countries

    Hello everyone: I am conducting a social science comparative study in several nations and I am worried about the sample size I need for each...

    Started by parsec2011‎, 05-28-2013 08:56 AM
    • Replies: 0
    • Views: 974
    05-28-2013, 08:56 AM Go to last post
  4. adj. r-square

    I got a negative adj. r-square. Since the effect size (Adj R-sq=-.016) was low, did it indicate that a time in treatment (the independent variable)...

    Started by eunkum1‎, 05-02-2014 01:20 PM
    • Replies: 8
    • Views: 3,166
    05-02-2014, 05:10 PM Go to last post
  5. Advantages/disadvantages of computing composite score these ways

    Hi, I'd highly appreciate your recommendations for a research I'm doing. More specifically, I'd like to know the advantages, disadvantages, and...

    Started by StatTalker‎, 04-03-2017 08:05 AM
    • Replies: 2
    • Views: 1,082
    04-04-2017, 02:18 AM Go to last post
  6. Advice for a book about Higher Order and Asymptotic Likelihood

    Hi, I'm a bachelor student in statistics. I'm looking for a book about higher order and asymptotic likelihood that is not too complicated and...

    Started by e__‎, 09-14-2015 07:50 AM
    • Replies: 0
    • Views: 805
    09-14-2015, 07:50 AM Go to last post
  7. Advice for analyzing a small sample

    I am currently working on my doctoral thesis in computer science and I have data from an experiment that I want to analyze, but I don't want to run...

    Started by Jefficus‎, 02-15-2010 02:51 PM
    • Replies: 5
    • Views: 5,753
    02-18-2010, 10:39 PM Go to last post
  8. Advice on appropriate statistical test

    I have 4 groups who provided scores and am interested in comparing the scores between groups to determine if they are significantly different. The...

    Started by StatisticsQuestion‎, 05-21-2014 08:27 AM
    • Replies: 2
    • Views: 1,281
    05-21-2014, 09:01 AM Go to last post
  9. advice on how to proceed

    Hello, I recently undertook to analyze a relatively simple data set. It includes estimates of tree species composition for several sites within...

    Started by wdmn‎, 11-07-2015 12:11 AM
    • Replies: 5
    • Views: 1,835
    11-10-2015, 12:37 PM Go to last post
  10. Advice on predictive modelling/forecasting

    Hi - I am looking for some advice on predictive forecasting. I will be taking measurements of power grid frequency data. These will all be within...

    Started by scothoward‎, 01-19-2011 08:28 AM
    • Replies: 1
    • Views: 3,694
    01-24-2011, 07:51 AM Go to last post
  11. Advice on specifying factors in a Permanova model - repeated measures design

    Hello all, I am new to the forum and this is my first post. I would appreacite if somebody could provide advice on the following problem: I am...

    Started by latimeria‎, 08-16-2012 07:09 PM
    • Replies: 0
    • Views: 1,618
    08-16-2012, 07:09 PM Go to last post
  12. Age Adjusted Rates

    So I'm trying to make my data match, in some ways, those used by the CDC (NCHS, specifically). In particular, I need to calculate age-adjusted...

    Started by bryangoodrich‎, 09-13-2011 12:28 PM
    • Replies: 0
    • Views: 2,004
    09-13-2011, 12:28 PM Go to last post
  13. Age and DNA methylation data: HELP NEEDED

    I have data on patient Age as well as change in % DNA methylation levels for promotor regions. I seek to understand the impact of Age on the % change...

    Started by capocrimini‎, 12-08-2013 07:48 AM
    age, dna, methylation, paired t-test, regression
    • Replies: 1
    • Views: 1,437
    12-08-2013, 11:21 AM Go to last post
  14. Age-Matching Groups Who Differ on Age

    I have two groups of children, A and B. Group A is the treatment group and has an age range of 5-7 years old. Group B is the control group and has an...

    Started by Barnzilla‎, 10-31-2008 01:40 PM
    • Replies: 4
    • Views: 5,835
    11-06-2008, 02:17 PM Go to last post
  15. Agreement between studies- which test is appropriate?

    I'm not using questionnaire. I need to find the agreement between previous studies on the elements of sustainability practice in campus. I'm applying...

    Started by fariha‎, 09-29-2015 02:28 AM
    • Replies: 3
    • Views: 1,341
    10-01-2015, 02:33 AM Go to last post
  16. Algebra of random variables?

    Hi Guys, I'm in the field now, so I'm not online much. However I do have a burning question. Does anyone have any book suggestions for me that...

    Started by TheEcologist‎, 03-12-2012 09:51 AM
    • Replies: 2
    • Views: 2,476
    03-12-2012, 11:33 AM Go to last post
  17. Algebra, two-sample t-statistic, variance

    Could someone help to start with the question. Question: http://s12.postimage.org/kvtyiacuj/question.png Thanks!

    Started by _joey‎, 08-06-2012 02:24 AM
    2 Pages
    1 2
    • Replies: 20
    • Views: 5,838
    08-13-2012, 12:31 AM Go to last post
  18. Alpha reliability

    Theoretically, is it ok to carry out a t-test to see the difference between two Cronbach alpha reliability scores? Thanks

    Started by JB89‎, 02-28-2012 11:58 AM
    • Replies: 0
    • Views: 1,385
    02-28-2012, 11:58 AM Go to last post
  19. Alpha under .7 in experience sampling data for some measurement moments

    I am facing a problem with my experience sampling data: Some of my alpha (Cronbach) are under .70 for 25 out of 240 measurement moments. Sometime...

    Started by mtrott‎, 03-28-2014 08:26 AM
    alpha, diary study, experience sampling
    • Replies: 0
    • Views: 1,225
    03-28-2014, 08:26 AM Go to last post
  20. alternative to anova

    What is an alternative statistical test to anova. I have a large varience between three groups (control and two experimental). How can I determine...

    Started by deardirestraits‎, 12-15-2011 03:37 PM
    • Replies: 10
    • Views: 5,485
    12-16-2011, 09:43 PM Go to last post
  21. Alternative to Pearson's Chi-Square Goodness of fit test, when expected counts < 5

    Hi there, In a part of my research, I am fitting probability distribution models for the count data(and binomial data) using Poisson, Binomial,...

    Started by arun‎, 03-29-2013 01:55 AM
    • Replies: 2
    • Views: 1,554
    04-21-2013, 08:08 AM Go to last post
  22. Cool Alternative to two-sample t-test when proportions are SMALL (<0.001)

    Hi, I'm looking for an alternative to the two-sample (independent) t-test for equality of proportions. The two-sample t-statistic only holds...

    Started by swnicholson‎, 01-14-2009 04:15 PM
    • Replies: 0
    • Views: 4,338
    01-14-2009, 04:15 PM Go to last post
  23. Alternatives for Non-normality and Inequality of Variance?

    I've been working with a rather difficult data set for over a week with no real progress. I am trying to compare the effect of temperature (15, 20,...

    Started by nebulus‎, 03-17-2017 11:04 PM
    2 Pages
    1 2
    • Replies: 16
    • Views: 3,534
    03-22-2017, 07:22 AM Go to last post
  24. Post Am I applying this Chi-squared test correctly?

    Hi everyone! I am a history grad student and I am trying to use some statistics in one of my papers. I am working with a certain (ancient) text...

    Started by badslacker‎, 06-15-2013 08:26 PM
    • Replies: 4
    • Views: 1,789
    06-16-2013, 08:53 PM Go to last post
  25. an event study? I can't stand. which way should I choose?

    Please a little help. There is an event. You can think a government interference . So, price of firms is decreased and therefore quantity of...

    Started by tiago2‎, 01-01-2011 07:12 AM
    • Replies: 3
    • Views: 6,412
    01-02-2011, 06:15 PM Go to last post
  26. analyse of likert scale confusion please help

    Hello I am conducting research into how behvaviour changes from year 1 to year 2 of study on a college course. I have provided students with a...

    Started by mhowells3‎, 02-23-2011 05:22 PM
    • Replies: 9
    • Views: 5,104
    08-23-2011, 07:58 PM Go to last post
  27. Analyse unemployment rate and public expenditure on active labour market policies?

    Hello everyone, I have a data set of OECD. I would like to analyse the relation between this two indicators: the relation between unemployment rate...

    Started by boale87‎, 01-17-2014 01:12 PM
    benefits, economics, gdp, policy, unemployment
    • Replies: 0
    • Views: 1,191
    01-17-2014, 01:12 PM Go to last post
  28. Analysing an unbalanced factorial design

    Hello, I have data from an unbalanced factorial design, and would like some suggestions to analyse them. It is supposed to be 3 x 2 factorial...

    Started by madegwu‎, 02-28-2012 02:17 AM
    • Replies: 2
    • Views: 4,298
    02-28-2012, 11:43 PM Go to last post
  29. Analysing Limited Data

    Help! For my thesis I involuntary have a small dataset due to a limited population. I was thinking about analysing this data with the statistical...

    Started by IngevanderBorg‎, 03-03-2017 06:52 AM
    anova, bayesian analysis, nonparametric, small data set
    • Replies: 0
    • Views: 1,121
    03-03-2017, 06:52 AM Go to last post
  30. Analysis of Categorical Data

    Hello friends, I'am doing intermediate statistics for second year and I'am having some issues with this chapter. My professor told...

    Started by Bajic‎, 03-06-2011 04:44 PM
    • Replies: 0
    • Views: 3,237
    03-06-2011, 04:44 PM Go to last post
  31. Analysis for different data scales

    Hello everyone. I have a question that how can I perform regression/correlation or hypotheses testing on a data which has different response...

    Started by emmasood‎, 07-19-2017 09:17 AM
    • Replies: 0
    • Views: 312
    07-19-2017, 09:17 AM Go to last post
  32. Analysis for MSc - multiple regression?

    Hi everyone, I hope someone wouldn't mind checking I am on the right track with the stats for my MSc project (recovery times in reptiles...

    Started by Frizzp‎, 08-08-2011 04:10 AM
    • Replies: 1
    • Views: 1,640
    08-08-2011, 11:38 AM Go to last post
  33. Analysis Likert Data and Comparing 2 Groups

    I have 2 groups of people. There are 75 people in each group. Each group was given the same set of 7 Likert items. I want to compare the results...

    Started by nigellscott‎, 05-30-2013 08:27 AM
    likert items
    • Replies: 7
    • Views: 2,555
    06-22-2013, 06:04 AM Go to last post
  34. Analysis of 5 point Likert Scale Data

    I am working on analysis of a survey conducted with a 5 point likert agreement scale. I need to explain why 70&#37; agreement (combined agreed and...

    Started by AAA‎, 12-15-2009 12:12 AM
    • Replies: 1
    • Views: 12,394
    12-15-2009, 08:47 PM Go to last post
  35. Analysis of a matched case-control study

    Please, i need help on my analysis. It is a 1-1 matched case-control studies. I am willing to pay for the guidance. My deadline is friday.

    Started by Madonna‎, 01-27-2014 04:04 AM
    • Replies: 11
    • Views: 2,821
    01-27-2014, 10:17 AM Go to last post
  36. Thumbs up Analysis of counts data from consumer test

    Hi everyone, First of all I'm new to this forum so my apologies in advance for the mistakes I could do by posting here. My issue is the...

    Started by victormoulinier‎, 04-22-2015 09:43 AM
    best choosing, consumer test, count analysis
    • Replies: 2
    • Views: 1,298
    04-22-2015, 10:33 AM Go to last post
  37. Analysis of Covariance

    Hi everyone, I would like to ask a question about the type of scale (e.g. categorical , continues variable) that should be use as a covariate. I...

    Started by ghada8888‎, 04-10-2012 10:08 AM
    • Replies: 0
    • Views: 1,030
    04-10-2012, 10:08 AM Go to last post
  38. Analysis of elections data?

    Dear All, I am currently writing an article on two parliamentary elections taking place in one country during 2009. Data consists of two exit-poll...

    Started by SAJ‎, 12-12-2009 12:45 PM
    2 Pages
    1 2
    • Replies: 29
    • Views: 11,659
    12-31-2009, 06:29 AM Go to last post
  39. Analysis of electricity consumsion

    Hello @all I want to analyze on how several factors have an effect on electricity consumtion (measured in mw). Before I start to gather the data,...

    Started by chesterluck‎, 03-19-2013 03:01 AM
    electricity consumtion, methodology, mlr, right model
    • Replies: 0
    • Views: 1,057
    03-19-2013, 03:01 AM Go to last post
  40. Analysis of spread of data for numerical modelling

    Hi all, I want to firstly admit that I am not the best statistician, hence why I am here, but I will try and explain my problem as clearly as...

    Started by Nskelly‎, 08-10-2017 11:08 AM
    • Replies: 0
    • Views: 1,576
    08-10-2017, 11:08 AM Go to last post
  41. Analysis of Variance.

    Hi all, I have a one question about the analysis of variance. If I have to variables (e.g. A &B) and I want to deal with them as covariate to...

    Started by ghada8888‎, 01-15-2012 04:10 PM
    • Replies: 1
    • Views: 1,859
    02-04-2012, 04:42 PM Go to last post
  42. analysis over all items OR by-subject OR by-items analysis?

    Hi, Let's say you have a data set of for instance 20 subjects who all answered 15 questions. Every question is one items that is either correct...

    Started by fruppel‎, 02-20-2015 08:05 AM
    by-subject by-item
    • Replies: 1
    • Views: 1,590
    02-20-2015, 10:22 AM Go to last post
  43. 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
  44. Analysis Workflow: Best practices

    Hello all, I hope this finds everyone doing well. I have a couple of questions about workflow for analyses. Hopefully, this will be of broad...

    Started by jpkelley‎, 07-23-2011 04:03 PM
    workflow
    • Replies: 4
    • Views: 2,363
    07-23-2011, 11:55 PM Go to last post
  45. Analytic options with multi-level data?

    Hello, I've been struggling with choosing an analytical approach to some multi-level data (3 level) I'm working with and wanted to get some fresh...

    Started by schunajm‎, 08-05-2012 02:52 PM
    • Replies: 12
    • Views: 2,901
    01-31-2013, 01:15 PM Go to last post
  46. Analyzing 311 Calls trend

    For an assignment, I am analyzing 311 call trends. I have downloaded the total number of 311 calls made in my city per month for the last five years...

    Started by Statz‎, 04-28-2014 03:21 PM
    • Replies: 3
    • Views: 1,446
    04-28-2014, 03:55 PM Go to last post
  47. Analyzing a repeated experiment with only one subject

    My experimental setup is explained using a simplified analogy of what I am doing: We are dropping 40 balls into a body of water. All the balls are...

    Started by k_scheduler‎, 07-25-2013 09:43 AM
    • Replies: 0
    • Views: 1,483
    07-25-2013, 09:43 AM Go to last post
  48. Question Analyzing Customer Satisfaction Indexes

    Hello, I work for a company and we recently started to measure our customer satisfaction index. We chose the sample size based on a well-known...

    Started by rafael_josem‎, 01-31-2011 01:06 PM
    • Replies: 1
    • Views: 1,890
    01-31-2011, 01:09 PM Go to last post
  49. Analyzing data - what tools should I use?

    Hello, I am analyzing data of seat distribution among different types of rail wagons. I have m types of wagons and n seats. What I want to achieve...

    Started by pockoc‎, 12-01-2015 03:13 AM
    • Replies: 1
    • Views: 1,323
    12-01-2015, 08:47 AM Go to last post
  50. Red face Analyzing factor scores from principal components analysis

    Hoping someone can help - I performed a PCA (using SPSS 18 Gradpack) on 10 variables (all measured on a scale of 0-10). Cases are individual...

    Started by careerstudent‎, 04-14-2010 06:34 PM
    • Replies: 6
    • Views: 5,640
    04-17-2010, 02:45 PM Go to last post
  51. Analyzing Gentrification with Data

    Hello, I am developing a masters thesis which will attempt to utilize census tract data to assess the occurrence of gentrification in Washington,...

    Started by mryan13‎, 01-11-2013 07:32 PM
    data, gentrification, statistics
    • Replies: 0
    • Views: 1,296
    01-11-2013, 07:32 PM Go to last post
  52. Analyzing Likert scale

    Hi, I am doing my research on QWL prevailing in Industry. I have collected data through questionnaire on 5 point likert scale, 1=strongly disagree...

    Started by JSahni‎, 04-29-2011 03:10 PM
    • Replies: 4
    • Views: 11,065
    05-01-2011, 07:56 AM Go to last post
  53. 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: 1,646
    06-29-2016, 01:50 AM Go to last post
  54. Analyzing Multiple Regression - Comparing to Simple Regression

    I am working on a paper where the methodology was already approved. I know it isn't the "best" way to analyze my question but I am moving forward...

    Started by JerLon‎, 12-31-2013 11:13 AM
    • Replies: 0
    • Views: 1,299
    12-31-2013, 11:13 AM Go to last post
  55. Analyzing Pooled Likert Data

    Hi Everyone, I'm analyzing Likert Survey Responses for a question "How satisfied are you with your Item?" (1 = Very Dissatisfied / 5 = Very...

    Started by ac2013‎, 09-13-2013 06:21 AM
    • Replies: 3
    • Views: 1,047
    10-01-2013, 08:40 AM Go to last post
  56. Thumbs down Analyzing statistics reports

    I am working on analyzing a report regarding ginger use in alleviating nausea/vomiting in pregnancy. I had my professor look over my report because...

    Started by jenclark242‎, 10-01-2010 03:01 PM
    • Replies: 0
    • Views: 2,012
    10-01-2010, 03:01 PM Go to last post
  57. Analyzing with heavy skew, transforms not working?

    I have a set with around 200 individuals dealing with cognitive task scores. Most of it is skewed heavily and I'm trying to analyze ideally with a...

    Started by excellrec‎, 05-19-2011 02:25 PM
    • Replies: 7
    • Views: 2,771
    05-24-2011, 06:08 PM Go to last post
  58. Ancova

    Hello, For an ANCOVA the scores for each group (defined by the levels of the factors) should be normally distributed. Does this apply for the...

    Started by Wilbert‎, 08-31-2013 01:02 PM
    • Replies: 3
    • Views: 1,327
    09-03-2013, 05:08 AM Go to last post
  59. another MLE please

    f(x)=e^-(x-\theta) -(x-\theta) is the exponent x>\theta I need to find MLE for \theta I tried doing it with a graph, but I got strange...

    Started by WeeG‎, 06-09-2010 09:33 AM
    • Replies: 4
    • Views: 5,340
    06-09-2010, 02:09 PM Go to last post
  60. Anova

    I am trying to find the effects of feed rate, cutting speed and depth of cut on surface roughness. I have five sets of feed rate ( 0.09, 0.10, 0.125,...

    Started by saad2733‎, 02-28-2016 01:42 PM
    anova, minitab
    • Replies: 5
    • Views: 2,589
    02-29-2016, 06:07 AM Go to last post

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