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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: 18,766
    10-11-2014, 12:02 PM Go to last post
  1. HMLR and ANOVAs instead of structural equation modelling

    Hi,* I have two studies within my thesis; The first is cross-sectional, and tests a theoretical framework of leadership - it explores the...

    Started by EmmaL‎, 06-06-2017 03:15 PM
    • Replies: 0
    • Views: 603
    06-06-2017, 03:15 PM Go to last post
  2. Holt's Exponential Smoothing Vs Brown Double Exponential Smoothing

    Hello, According to books Brown Double Exponential Smoothing (one parameter=alpha) is a special case of Holt's Linear Exponential Smoothing (two...

    Started by zarasandreas‎, 01-10-2012 05:51 AM
    • Replies: 0
    • Views: 3,281
    01-10-2012, 05:51 AM Go to last post
  3. Homogeneity assumption mixed ANOVA

    For my research I did a mixed ANOVA. The homogeneity assumption was violated. However, I learned that this is only a problem when the group sizes...

    Started by Pluzan‎, 07-20-2013 06:37 AM
    • Replies: 9
    • Views: 3,831
    08-09-2013, 12:37 PM Go to last post
  4. Homogeneity of Variance

    Hi all, I want to test the Homogeneity of Variance (HV) before conducted MANOVA, and I have to groups (different nationality; Arabs and British)...

    Started by ghada8888‎, 11-22-2011 05:15 PM
    • Replies: 1
    • Views: 1,966
    11-26-2011, 06:46 PM Go to last post
  5. Homogenity and Heterogenity

    Hello everyone. I have read that Homogenity and Heterogenity are used for population that have/do not have accordingly the same variance σ^2. Does...

    Started by dervast‎, 05-06-2010 10:29 AM
    • Replies: 1
    • Views: 2,701
    05-08-2010, 01:09 AM Go to last post
  6. homogenity of variance

    I have 4 groups in a study that suffer from homogenity of variance. I use STATA. Should i trasnform the data? and how do i do that? is a log...

    Started by fromsydney‎, 09-21-2011 09:08 PM
    • Replies: 3
    • Views: 4,302
    09-22-2011, 02:58 PM Go to last post
  7. Hosmer_ Lemeshow test

    Dear teachers, In SPSS I ran a uniariate logistic regerssion to use the statistically significant ones in the multivariate logistic regression. I...

    Started by phi‎, 01-17-2013 04:11 PM
    • Replies: 3
    • Views: 2,890
    01-17-2013, 05:15 PM Go to last post
  8. Hot deck imputation issues

    Background: I had a data set containing 212 observations with a lots of missing values. Most of the IVs and DVs are categorical (DVs are ordinal)...

    Started by Blain Waan‎, 01-28-2013 02:12 AM
    imputation, missing data imputation
    • Replies: 0
    • Views: 1,515
    01-28-2013, 02:12 AM Go to last post
  9. Hotelling's T2 test and chi2 distributions

    For the 1-2 weeks I've been trying to decompose the T2 statistic into two independent chi2-distributed statistics, but have had no success. I'm...

    Started by MikeC‎, 04-23-2017 01:34 PM
    • Replies: 0
    • Views: 754
    04-23-2017, 01:34 PM Go to last post
  10. 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
  11. How can I analyse this data?

    Hi guys, I'm currently doing research for my dissertation. Background info: Generally speaking, I am studying perceptions of different factors...

    Started by thetonto‎, 02-24-2012 02:39 PM
    • Replies: 1
    • Views: 1,285
    03-02-2012, 04:44 PM Go to last post
  12. 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: 2,494
    04-13-2016, 04:04 PM Go to last post
  13. Question How can i check from this table if data normally distrubtion or not ?

    Hello How can I check from this output if data normally distribution or not ?

    Started by hanialbarni‎, 12-13-2014 02:04 AM
    • Replies: 1
    • Views: 1,754
    12-15-2014, 07:56 AM Go to last post
  14. How can I statistically prove which data is more reliable

    We have a task to statistically identify which data set is more reliable among the two sources. Case background: Design function releases drawings...

    Started by Bhaskar‎, 11-26-2016 12:56 AM
    • Replies: 0
    • Views: 2,546
    11-26-2016, 12:56 AM Go to last post
  15. How do i add 5 spss freq count tables together?

    Please can anyone help? I use spss (DOS version) and need to add five variables together. THey are all the same and contain the same values. When...

    Started by lisa131067‎, 03-01-2009 02:08 PM
    • Replies: 1
    • Views: 4,229
    03-01-2009, 07:22 PM Go to last post
  16. 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: 946
    01-24-2016, 10:34 PM Go to last post
  17. How do I calculate the Sample Size for this type of Survey?

    Hi all, I need to calculate the sample size for a survey I will be undertaking soon. The target population will be the clients of 8 hotels,...

    Started by zicitron‎, 03-15-2013 11:53 PM
    sample size, sample size calculation, surveys, target population
    • Replies: 0
    • Views: 1,028
    03-15-2013, 11:53 PM Go to last post
  18. How do I compare different demographic groups that did the same survey?

    Hi, this is my first post so apologies in advanced if I'm asking things incorrectly! I'm doing a market research course and we've conducted a...

    Started by jamieaa64‎, 05-16-2011 06:11 AM
    • Replies: 0
    • Views: 2,870
    05-16-2011, 06:11 AM Go to last post
  19. How do I define this research design?

    This is a fairly straightforward question but I can't seem to find a good definition to categorize some review board paperwork I need to do. ...

    Started by Whitcoatsyndrom247‎, 04-22-2014 03:49 PM
    • Replies: 1
    • Views: 1,022
    04-22-2014, 08:52 PM Go to last post
  20. Question How do I determine best choice based on confidence values?

    I have this problem I don't know how to solve. I have X variables. One of them is a key value. I have different data sets, each containing rows of...

    Started by genesis‎, 11-21-2014 12:08 AM
    • Replies: 0
    • Views: 1,391
    11-21-2014, 12:08 AM Go to last post
  21. How do I determine the Correlation Coefficient from a best fitting equation.

    I'm confused about how to determine the correlation coefficient after you find a linear regression line formula. I'm porting some linear...

    Started by Daniel Savage‎, 08-11-2011 11:32 AM
    • Replies: 0
    • Views: 1,839
    08-11-2011, 11:32 AM Go to last post
  22. How do I report marginal means of a two-way unrelated ANOVA correctly? APA-style

    Hello, after doing a two-way unrelated ANOVA (General Linear Model > Univariate) on SPSS, I am confused how to report the output correctly. My...

    Started by ein8horn‎, 08-21-2011 05:46 PM
    anova, apa, marginal, means, report
    • Replies: 0
    • Views: 6,533
    08-21-2011, 05:46 PM Go to last post
  23. How do I use PERMANOVA/interpret the results

    I am doing this research project comparing the snail community across two species of sea grass. Ten sample quadrats were collected from each sea...

    Started by Nithya‎, 10-24-2015 05:18 AM
    • Replies: 1
    • Views: 3,192
    10-24-2015, 07:52 AM Go to last post
  24. How do t-test when I normalize one of the data sets?

    Hi everyone! I have three proteins, let's call them A B & C. B and C are mutated forms of A. I test the activity of A B & C three times....

    Started by joppe‎, 10-30-2012 06:03 PM
    • Replies: 0
    • Views: 4,583
    10-30-2012, 06:03 PM Go to last post
  25. Unhappy How do we compare medians?

    Hi, I have a project whereI have to compare short term and long term medians of a given data over four not consecetive years, like 1999, 2007,...

    Started by SadieKhan‎, 11-26-2010 07:14 AM
    • Replies: 2
    • Views: 7,151
    12-04-2010, 04:43 AM Go to last post
  26. How do we do statistics on repeated phenomenon?

    Hi everyone, I've got a question on statistics on repeated phenomenons. For example, If I have a time series data which I used exploratory data...

    Started by hslinhc‎, 12-04-2010 05:28 PM
    • Replies: 0
    • Views: 3,371
    12-04-2010, 05:28 PM Go to last post
  27. how do we estimate regression parameters in survival analysis

    Dear All, I would like to ask how to estimate regression parameters(Beta) in Accelerated Failure Time Model? Does anybody knows any resources?...

    Started by masarimk‎, 03-25-2017 11:58 PM
    • Replies: 3
    • Views: 1,386
    04-02-2017, 10:43 AM Go to last post
  28. Cool How do you account for under representation in your survey sample

    Overall, i have 10 groups in my sample. 2 groups are under represented. What is the best way to account for this under representation. Would...

    Started by hsaharmo‎, 08-06-2011 04:50 PM
    • Replies: 1
    • Views: 2,227
    08-08-2011, 03:18 AM Go to last post
  29. How do you convert yearly and period CPI to that of a rolling basis?

    Hi Guys, I am doing research and currently I am trying to utilize Consumer Price Index data. I have two sets of consumer price data, one that...

    Started by dannylimstata‎, 04-23-2012 04:35 AM
    • Replies: 0
    • Views: 1,028
    04-23-2012, 04:35 AM Go to last post
  30. How does observation error effect a minimal sample size for a t test?

    Hello, I calculate minimal sample size to compare means of two groups (different treatment) of datapoints by a t test. For continuously...

    Started by bondsergey‎, 10-26-2012 12:11 PM
    • Replies: 7
    • Views: 2,005
    10-30-2012, 05:54 PM Go to last post
  31. How does one develop statistical models to compensate for weakness in public data?

    Hi everyone. I have an interview coming up and the role is data centric. I have a strong knowledge of data and management, however I have never...

    Started by Jaysin‎, 08-23-2016 05:28 PM
    • Replies: 7
    • Views: 1,114
    08-24-2016, 11:08 AM Go to last post
  32. How does sampling reduce selection bias?

    Hi everyone, I'm struggling to understand theoretically how sampling reduces selection bias. Take the following example: Supposing there is a...

    Started by phil7686‎, 06-01-2012 03:37 PM
    sampling, selection bias
    • Replies: 1
    • Views: 5,140
    06-04-2012, 08:32 PM Go to last post
  33. How have you dealt with missing values?

    I'm currently conducting a large content analysis on company disclosures and have a lot of missing values. I've been looking at different ways to try...

    Started by Freaked_out‎, 06-21-2010 11:54 PM
    • Replies: 0
    • Views: 3,025
    06-21-2010, 11:54 PM Go to last post
  34. 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: 1,731
    06-26-2016, 04:35 PM Go to last post
  35. how it comes Exact sig = 1

    hello, please help me to intrepret the Mann whitney output figuring in the picture bellow.And especially if the (exact sig = 1) is coorect ? ...

    Started by ilyes‎, 04-22-2017 06:02 AM
    • Replies: 0
    • Views: 844
    04-22-2017, 06:02 AM Go to last post
  36. How many people are needed for a valid sample?

    Question I have to answer: In order to collect a survey of opinions, I would like to take a sample of a city with a population of 600,000 people....

    Started by frieswiththat‎, 10-07-2011 06:07 PM
    • Replies: 0
    • Views: 2,735
    10-07-2011, 06:07 PM Go to last post
  37. How many random events to cover everything with 95% confidence?

    Ok so I have what I believe to be a rather easy question, which I even feel I should be able to solve myself, but I can't... I hope someone can help...

    Started by I_do‎, 09-15-2010 02:28 PM
    • Replies: 4
    • Views: 3,002
    09-22-2010, 03:14 AM Go to last post
  38. How many subsamples from large sample should I draw?

    Hi, I am working on an analysis where I compare 2 different samples, one Dutch and one US sample. The US sample is bigger than the Dutch sample...

    Started by Delforterie‎, 12-11-2012 09:17 AM
    • Replies: 3
    • Views: 1,650
    12-14-2012, 05:24 AM Go to last post
  39. How many tests?

    Hi, I am trying to bridge a new reagent with an existing one so when the existing one runs out I can use the new one. I want to test the old and...

    Started by Emuk81‎, 08-06-2014 09:05 AM
    • Replies: 1
    • Views: 1,125
    08-06-2014, 09:10 AM Go to last post
  40. How robust is ANOVA's F-statistic?

    Hello there! I have theoretical question about the robustness of the F-statistic used in ANOVA when used on data that is negatively skewed. Many...

    Started by bimodal‎, 06-29-2012 12:28 PM
    • Replies: 3
    • Views: 3,223
    06-29-2012, 01:48 PM Go to last post
  41. How should I explain this results?

    The hypothesis is: the willing-to-pay is higher when people see print ad with testimonial. So there are four print ads 1. 1 cola ad with...

    Started by yue86231‎, 11-13-2015 07:57 AM
    • Replies: 4
    • Views: 1,594
    11-14-2015, 01:34 PM Go to last post
  42. How should I further analyse this result?

    I have following variables: -"adtype" (1 is print ad with testimonials, 2 is print ad without testimonials.) -"AT1" which is "ad attitude...

    Started by yue86231‎, 11-24-2015 09:45 AM
    • Replies: 4
    • Views: 2,067
    12-04-2015, 04:05 AM Go to last post
  43. How should I run an interaction test to find out the main effect of ad type?

    Hello everyone, I designed an experiment. There are two types of advertisement, type 1 and type 2. 50% of my participants looked at the type 1 and...

    Started by yue86231‎, 01-20-2016 11:05 AM
    • Replies: 1
    • Views: 1,124
    01-21-2016, 04:36 AM Go to last post
  44. Unhappy How they obtained the following results

    I need a little help, I just starting with statistics and I'm trying to figure out how the calculated result is 11.8532? Hypothesis H1 was: "There...

    Started by markecb‎, 07-30-2013 12:19 PM
    • Replies: 2
    • Views: 1,494
    07-30-2013, 02:31 PM Go to last post
  45. How to prove the UMVUE under these conditions

    Hi everyone, the question is Let \mathbb{U} be the set of all unbiased estimators of 0. Namely, \mathbb{U}={U(X):...

    Started by egpivo‎, 04-05-2010 07:54 AM
    • Replies: 3
    • Views: 3,252
    04-06-2010, 12:00 PM Go to last post
  46. How to address the problem of "censorship" in star ratings?

    Hello dear forum members, I am conducting a study exploring the relationship between online review-based ratings (min 1, max 5) and doctors'...

    Started by kiton‎, 06-11-2015 10:30 AM
    • Replies: 2
    • Views: 1,510
    06-11-2015, 03:07 PM Go to last post
  47. How to Adjust Frequency Table Range

    I have a set of data and am trying to find the best ranges to create a frequency table/chart. As I change the first interval, the frequency table...

    Started by therichard‎, 04-14-2011 10:15 AM
    • Replies: 0
    • Views: 3,664
    04-14-2011, 10:15 AM Go to last post
  48. How to alculate cross loadings of each item in SPSS ?

    Hello Can someone give me the way to do it in SPSS

    Started by hanialbarni‎, 12-20-2014 12:04 AM
    • Replies: 0
    • Views: 1,520
    12-20-2014, 12:04 AM Go to last post
  49. How to alter the standard deviation of an empirical distribution?

    For the purpose of a simulation I need to increase the standard deviation of an empirical distribution. I want to simulate what will happen if the...

    Started by consuli‎, 02-21-2015 09:46 AM
    • Replies: 4
    • Views: 2,117
    02-21-2015, 05:46 PM Go to last post
  50. How to analyse 5-point likert data with different questions under 1 subset?

    I am working on a research assignment, and has received enough data for analysis In the project, I used health belief model (HBM) to investigate...

    Started by Hack‎, 10-22-2013 01:59 PM
    • Replies: 1
    • Views: 2,267
    10-01-2015, 08:23 AM Go to last post
  51. How to analyse a set of data without normality and homoscedasticity?

    Hello, I'm a postgraduate student in Biology. From some time on, I wanted to publish a paper regarding the affectance of temperature to the shell...

    Started by Alaris‎, 08-28-2015 02:08 AM
    • Replies: 0
    • Views: 1,043
    08-28-2015, 02:08 AM Go to last post
  52. how to analyse samples with different distribution?

    I have sample 1 with normal distribution and sample 2 with not normal distribution. I want to compare the means of both the samples.Can I compare...

    Started by jaisysamuel‎, 06-15-2014 04:31 AM
    • Replies: 3
    • Views: 1,767
    06-20-2014, 07:33 PM Go to last post
  53. How to analyse scale data?

    Hi all, For my dissertation I have done a likret scale questionnaire, 1-5 (1=strongly disagree, 2=mostly disagree....) about body image (10...

    Started by Sarah-dee‎, 03-19-2013 09:16 AM
    likert scale analysis, spss
    • Replies: 0
    • Views: 1,419
    03-19-2013, 09:16 AM Go to last post
  54. How to analyse this ranking survey ?

    Hi all, I got a project from a newspaper company to find out the consumer preference of different middle income and high income group people that...

    Started by ravirocks2789‎, 05-19-2013 12:16 PM
    • Replies: 4
    • Views: 2,574
    05-22-2013, 10:53 AM Go to last post
  55. How to analyze a variable measured on a Likert scale and its interaction with another

    0 down vote favorite I have to analyze this variable which consists of scores given to 3 items (1-9 scale). This "likert scale" measures "brand...

    Started by Stefan Stefanov‎, 06-17-2014 07:30 AM
    interaction, interaction effect, method, spss
    • Replies: 0
    • Views: 1,032
    06-17-2014, 07:30 AM Go to last post
  56. How to analyze change in performance

    Greetings, I have a task that two groups of participants completed at Time 1 and Time 2. I was planning to conduct a repeated measures ANOVA,...

    Started by Luxor‎, 04-28-2017 09:17 AM
    • Replies: 2
    • Views: 897
    04-28-2017, 12:11 PM Go to last post
  57. How to analyze different, complex data sets?

    I'm looking for a good way to compare data sets. For 20 months, we collected larval fish using standard sampling gear (produces larval fish/cubic...

    Started by The_Hand_Hunter‎, 01-20-2011 01:23 PM
    ecological statistics, study design
    • Replies: 3
    • Views: 9,215
    01-25-2011, 04:13 AM Go to last post
  58. Lightbulb How to analyze my bat data...number of bats vs. distance categories..

    Hello. I have some bat data that looks a bit like this: Distance from Unit Number of bats recorder 0-10metres ...

    Started by biggerdunk‎, 07-07-2013 01:15 PM
    • Replies: 1
    • Views: 1,919
    07-07-2013, 02:54 PM Go to last post
  59. How to Analyze this data?

    OK…so I am having difficulty trying to decide exactly how best to analyze the following data. Specifically, I am trying to determine the possible...

    Started by DFoley‎, 10-03-2011 06:02 PM
    • Replies: 7
    • Views: 3,164
    10-05-2011, 11:38 AM Go to last post
  60. Question How to analyze two opposing sides survey results?

    Hi! I am doing a research between two b2b sides that are cooperating. I have already made one survey and about to do the other. The point is to...

    Started by tehnik‎, 11-13-2016 01:31 PM
    • Replies: 2
    • Views: 3,328
    12-12-2016, 12:15 PM Go to last post

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