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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: 18,785
    10-11-2014, 12:02 PM Go to last post
  1. Representing a distance measure with math equation

    I'm working on presenting a distance measure at a conference but don't have a publication quality math formula for representing what I'm doing in R. ...

    Started by trinker‎, 11-10-2013 09:56 PM
    2 Pages
    1 2
    • Replies: 26
    • Views: 5,840
    11-11-2013, 04:54 PM Go to last post
  2. Overcoming small dataset anomalies in genetic algorithm

    Hello Talk Stats, this is my first post on this forum, interestingly typing in modeling forum in google took me to a series of websites that was not...

    Started by JIB‎, 11-11-2013 04:32 AM
    chi sq, polynomial regression, r square, significance, t test
    • Replies: 0
    • Views: 1,035
    11-11-2013, 04:32 AM Go to last post
  3. Which version of the Chi-Square test should I use?

    Hello, I am doing an honors project at my university. It is for my stat's class and due to the very short length of our class we did not cover the...

    Started by Aldin Malkoc‎, 11-09-2013 09:53 PM
    • Replies: 0
    • Views: 943
    11-09-2013, 09:53 PM Go to last post
  4. How to predict the uncertain parameter

    Hi, I am trying to predict the value of a parameter(Y) with varying frequency(X2) and X1(stall parameter). Y X1 ...

    Started by gokussj9‎, 11-07-2013 06:45 PM
    • Replies: 1
    • Views: 1,504
    11-07-2013, 09:56 PM Go to last post
  5. What test should I use to analyze my data?

    I'm currently a fourth year university student. As part of my studies, I'm taking a class called Capstone, where students design and carry out a...

    Started by MelissaN‎, 11-05-2013 05:05 PM
    questionnaire, research, test to use, university
    • Replies: 1
    • Views: 2,644
    11-05-2013, 05:27 PM Go to last post
  6. 3 Groups of Participants & Likert data

    Hi, I'm new to the forum - though I have browsed and found the resources helpful for a long time. Thank you to all who contribute here. I have...

    Started by Satele‎, 10-28-2013 07:45 AM
    analysis, data, likert, ordinal, scale
    • Replies: 7
    • Views: 1,953
    11-05-2013, 07:00 AM Go to last post
  7. Tim series Analysis in EViews

    Hello Everyone,I have a question which may be very simple .For Example I have estimated ARIMA(1,1,4) from a data having sample 1961-1999.To produce...

    Started by mtaimoor23‎, 11-04-2013 11:34 PM
    arima, eviews, time series
    • Replies: 0
    • Views: 1,050
    11-04-2013, 11:34 PM Go to last post
  8. Red face How to create a representative sample?

    Hello to all! :) I have recently launched a survey to students of specific universities among European countries and got nearly 3000 replies....

    Started by alexia_spyr‎, 11-03-2013 08:10 PM
    representativeness, sample
    • Replies: 2
    • Views: 2,454
    11-04-2013, 09:39 PM Go to last post
  9. Correlation matrix Not positive definite in PCA

    Hi, I am currently working on a project which returns a not positive matrix while conducting a PCA. As a result I don't get the sphericity test...

    Started by Elina‎, 11-01-2013 08:27 AM
    • Replies: 0
    • Views: 1,423
    11-01-2013, 08:27 AM Go to last post
  10. two questionnaires correlation with a Likert-type scale

    Hello Imagine we want to know how much correlation is there between amount of stuff people buy and amount of that stuff which they consume? (its...

    Started by sevensea‎, 10-31-2013 01:51 PM
    • Replies: 6
    • Views: 9,194
    11-01-2013, 07:43 AM Go to last post
  11. Identifying subset with maximum averages

    Dear all, I am trying to achieve the following task - and I wonder if there are analytical methods in any of the stats packages that can achieve...

    Started by cgrozev‎, 10-31-2013 06:16 AM
    maximizing average, subsets
    • Replies: 0
    • Views: 1,384
    10-31-2013, 06:16 AM Go to last post
  12. Principal Component Analysis in SPSS

    Hi, I have two main issues with SPSS. 1. I am currently trying to run a PCA in SPSS with 120 variables and 60 respondents (likert scale data)....

    Started by Elina‎, 10-30-2013 11:13 AM
    • Replies: 0
    • Views: 3,405
    10-30-2013, 11:13 AM Go to last post
  13. Interpreting Ranking Data

    I need help with the interpretation of ranking data. I should start by saying that Iím a writer/editor and have very little knowledge of statistical...

    Started by EricSchoeniger‎, 10-30-2013 08:44 AM
    • Replies: 0
    • Views: 2,948
    10-30-2013, 08:44 AM Go to last post
  14. violating assumptions mixed effect models

    Dear all, What happens if I use linear mixed effect models and the assumptions are violated (i.e. residuals are not normally distributed and/or...

    Started by Wilbert‎, 10-28-2013 10:21 AM
    • Replies: 0
    • Views: 1,214
    10-28-2013, 10:21 AM Go to last post
  15. Reversing a linear model?

    Hi, I have a system of equations that I wish to estimate and I wonder if problems arise if I reverse X and Y in a linear model. Here is the...

    Started by littlehippo‎, 10-27-2013 06:05 PM
    • Replies: 1
    • Views: 2,072
    10-27-2013, 06:16 PM Go to last post
  16. What should i do next?

    Hi all, I want to see the effect of gender changes depending on the race of student when they have drunk driving behaviors. There is an...

    Started by zjww58‎, 10-26-2013 10:13 PM
    • Replies: 0
    • Views: 1,072
    10-26-2013, 10:13 PM Go to last post
  17. What test to compare class data?

    I have given a pre and post test to two classes. One class did a particular activity (experimental group) and one class did not (control group). ...

    Started by justjess‎, 10-26-2013 02:30 PM
    • Replies: 0
    • Views: 1,372
    10-26-2013, 02:30 PM Go to last post
  18. Spatial Statistics and SAS Books

    Hi all, I am looking for a book that explains applied Spatial Statistics methodology using SAS. I am interested in Spatial, Spatiotemporal data...

    Started by szm‎, 10-26-2013 09:45 AM
    kriging, sas, spatial correlation, spatial statistics, variogram
    • Replies: 0
    • Views: 1,421
    10-26-2013, 09:45 AM Go to last post
  19. CFA using AMOS: Poor model fit for an instrument

    Hi everyone, I'm conducting CFA using AMOS to evaluate the structure of an instrument. The following models are specified and evaluated: Model...

    Started by Star7‎, 10-25-2013 07:27 AM
    • Replies: 3
    • Views: 3,480
    10-25-2013, 06:10 PM Go to last post
  20. Binning Question

    Hi everyone! For logistic regressions, is it ever ok to bin a continuous independent variable and then put both the continuous version and bins...

    Started by Oberon‎, 10-24-2013 04:17 PM
    • Replies: 0
    • Views: 1,078
    10-24-2013, 04:17 PM Go to last post
  21. what test should i use for analysis of data from rct

    Hi I am writing a research proposal It is a rct that hopes to refute the null hypothesis the use of clary sage will have no effect on...

    Started by nasherbasher‎, 10-23-2013 03:07 PM
    • Replies: 2
    • Views: 2,254
    10-24-2013, 04:29 AM Go to last post
  22. Cronbach's Alpha if items are not exposed equally..

    Can Cronbach's Alpha be calculated for a survey in which number of questions are not equally exposed to users? Say, I have 40 questions in a test,...

    Started by nidzie_07‎, 10-21-2013 04:59 AM
    • Replies: 1
    • Views: 1,296
    10-21-2013, 08:06 AM Go to last post
  23. Cumulative Periodogram

    Hello, As part of my master's research, I am exploring a cyclic pattern in daily climate data (latent heat flux). To explore this pattern, I...

    Started by hpants24‎, 12-07-2010 10:40 PM
    • Replies: 1
    • Views: 5,214
    10-20-2013, 11:17 PM Go to last post
  24. Unable to determine the right test?

    hello, I'm doing a paper on measuring authors productivity and unable to decide what should I use as my statistical test to come up with solid...

    Started by iha2005‎, 10-10-2013 04:23 PM
    • Replies: 8
    • Views: 2,399
    10-20-2013, 01:09 PM Go to last post
  25. Conditional Accuracy Functions

    Based on a previous study about reaction time as a proxy for attentional constraint, we are analyzing our data using conditional accuracy functions....

    Started by EnviroEve‎, 10-18-2013 12:46 PM
    • Replies: 0
    • Views: 1,233
    10-18-2013, 12:46 PM Go to last post
  26. post-hoc test after principal coordinate analysis

    Hello, I'm going to explore my dataset, composed by 100 subjects and 14 binary (1,0) variables. I was wondering if my protocol makes sense: 1)...

    Started by Marco777‎, 10-18-2013 05:40 AM
    • Replies: 0
    • Views: 1,249
    10-18-2013, 05:40 AM Go to last post
  27. How to forecast (time series trend) with simple exponential smoothing?

    Let's say I have my actual time series data for periods: Year Actual Forecast 2003 738 2004 937 2005 619 2006 862 2007 800 2008 950 ...

    Started by MaggieN‎, 10-16-2013 10:06 AM
    • Replies: 0
    • Views: 1,412
    10-16-2013, 10:06 AM Go to last post
  28. What test should have been used...

    Done with the assignment ... No replies :(

    Started by cloud‎, 10-15-2013 08:35 PM
    • Replies: 0
    • Views: 1,398
    10-15-2013, 08:35 PM Go to last post
  29. t-test with class labels as probabilities

    I'm trying to find a generalization of the t-test that I'm sure someone has done before; I just can't seem to find a reference, probably because I've...

    Started by Daniel Dvorkin‎, 10-14-2013 12:31 PM
    • Replies: 2
    • Views: 1,630
    10-14-2013, 02:09 PM Go to last post
  30. Statistical significance of the accuracy of two distinct methods

    My task to achieve is the following: I have one given dataset at hand. Furthermore, I have given a gold standard I want to compare my results to....

    Started by killver‎, 10-11-2013 07:58 AM
    • Replies: 9
    • Views: 2,317
    10-14-2013, 08:49 AM Go to last post
  31. Proper Sampling - Can i sample like this without destroying reliability?

    The population that i need to extract a sample from is all firms from country A with activities in country B. The firms are classified into two...

    Started by Suppai‎, 10-13-2013 01:49 PM
    methodology, population, sample, sample groups, sampling
    • Replies: 1
    • Views: 1,279
    10-13-2013, 03:52 PM Go to last post
  32. Research topic for Stats Phd, working as Business Analytics Manager

    Dear all, I was a Phd student in Math/ISyE department. At the same time I am a Business Analytics Manager at a corporation. I've finished all...

    Started by StatPhd‎, 10-08-2013 10:04 PM
    corporation, phd topic, research for thesis
    • Replies: 1
    • Views: 2,614
    10-12-2013, 03:40 AM Go to last post
  33. PCA and symmetric distribution.

    Hello, I hope you can clarify my doubts. I'm an Italian student of business administration. For my thesis I study the application of PCA method for...

    Started by g.arcuri88‎, 10-11-2013 04:30 AM
    pca, pca analysis, symmetry
    • Replies: 1
    • Views: 1,728
    10-11-2013, 04:34 PM Go to last post
  34. Thumbs up Unweighted population vs weighted population

    Hi everyone, I have a dilemma of trying to find how to best read a data. Here is a sample of my data, the question is how frequent do you buy a...

    Started by grue‎, 09-25-2013 10:23 PM
    • Replies: 2
    • Views: 3,407
    10-10-2013, 09:56 PM Go to last post
  35. Is non-parametric test necessary for independent Likert-type items?

    Hi everyone I am having a difficulty in extending my survey analysis containing Likert-type item/questionnaires. I'll try my best to give a detailed...

    Started by mendygrace‎, 10-08-2013 11:04 PM
    descriptive analysis, non-parametric test, statisics
    • Replies: 7
    • Views: 2,343
    10-10-2013, 08:04 AM Go to last post
  36. How to report Correspondence Analysis

    Hi. I'm busy with a scientific research honours thesis, and for my results the statistician at my university conducted a correspondence analysis...

    Started by Adri‎, 10-10-2013 02:36 AM
    correspondence analysis, eigenvalue, reporting results, scatterplot
    • Replies: 3
    • Views: 1,767
    10-10-2013, 04:48 AM Go to last post
  37. Stat used in Med Articles - HELP

    Hi Folks, Just to let you know I didn't even know where to post the thread, so apologize if I am in the wrong section :) I am reviewing articles...

    Started by cloud‎, 10-08-2013 08:55 PM
    • Replies: 9
    • Views: 1,780
    10-09-2013, 04:55 AM Go to last post
  38. Lightbulb Kendall's W for testing similarity of proportions for non-ranked count data?

    Hello forum, I can't find the answer to this anywhere, and I'd really appreciate a helping hand. :confused: I'm doing an MSc project and my...

    Started by kaia‎, 06-13-2013 03:34 PM
    concordance, kendall, proportion, rank
    • Replies: 1
    • Views: 1,574
    10-08-2013, 08:04 PM Go to last post
  39. Estimating a confidence interval for a pooled sample using only descriptive stats

    Hi there Sorry for the vague title; I suspect my query is a simple one but I'm not quite sure how to phrase it. I have data on a number of...

    Started by sirbuttzalot‎, 10-08-2013 07:03 PM
    • Replies: 0
    • Views: 1,605
    10-08-2013, 07:03 PM Go to last post
  40. Sampling distribution for dissimilarity index

    The dissimilarity index is a well known metric used to measure spatial unevenness between two groups. Does anyone know of a sampling distribution...

    Started by tyroc7‎, 10-07-2013 09:41 PM
    dissimilarity index, sampling distribution
    • Replies: 1
    • Views: 1,270
    10-08-2013, 04:50 PM Go to last post
  41. Unhappy help with analysis

    I conducted a study in which I examined the same subjects in two different modes - day and night. The tests were given in the two situations are the...

    Started by shirlyka‎, 10-08-2013 09:27 AM
    spss, spss test
    • Replies: 0
    • Views: 1,161
    10-08-2013, 09:27 AM Go to last post
  42. Using neares neighbour algorithm to retrofit a control group

    In my line of work, we are often tasked with measuring the effects of an intervention a bit too late to be involved in the selection of who gets an...

    Started by Ullsokk‎, 10-08-2013 03:13 AM
    • Replies: 0
    • Views: 1,029
    10-08-2013, 03:13 AM Go to last post
  43. Unsure of which analysis I should use. Hoping for some help!

    You will have to forgive me, Iím moderately inexperienced in this, and have been having one of those weeks where I keep questioning myself. Iím...

    Started by Eon‎, 10-07-2013 10:18 PM
    • Replies: 0
    • Views: 907
    10-07-2013, 10:18 PM Go to last post
  44. Principle Components, Canonical Variate Analysis and Win-DAS

    I'm trying to follow some analysis procedures as presented in an applied microbilogy paper. The authors did a principle components analysis (PCA)...

    Started by bwwhite‎, 10-07-2013 03:17 PM
    • Replies: 0
    • Views: 1,342
    10-07-2013, 03:17 PM Go to last post
  45. Help with comparing variability of 3 variables on different scales

    Hi, I have 3 socioeconomic variables on different scales (yearly income, job category, and years of education) and I'm interested in determining...

    Started by Karissa‎, 10-05-2013 04:02 PM
    • Replies: 0
    • Views: 2,847
    10-05-2013, 04:02 PM Go to last post
  46. Regression diagnostics on panel data regression

    Hey guys. I've not worked much in panel data regression but what I've been thinking about (and not been able to find much information about) is...

    Started by starpen‎, 10-05-2013 03:30 AM
    diagnostic, longitudinal data, regression analysis
    • Replies: 0
    • Views: 2,796
    10-05-2013, 03:30 AM Go to last post
  47. Book for Applied Panel Data Analysis

    Hello, I am looking for a book with the topic applied panel data analysis. I already had a look on these ones: ANALYZING PANEL DATA (P) This...

    Started by consuli1‎, 10-03-2013 10:43 AM
    • Replies: 0
    • Views: 1,232
    10-03-2013, 10:43 AM Go to last post
  48. Statistics of Rating

    In a website, albums are ranked based on users' input. Each user selects some albums to rate, giving each album a whole number between 1 and 10. I...

    Started by azsantosk‎, 10-02-2013 08:59 AM
    rankings, ratings
    • Replies: 0
    • Views: 1,408
    10-02-2013, 08:59 AM Go to last post
  49. ANOVA, Mann-Whitney or both?

    I want to calculate the statistics of a clinical study with SPSS. 4 groups with 16 variables and I want to compare the mean values of every...

    Started by DaH‎, 10-02-2013 07:57 AM
    • Replies: 0
    • Views: 1,525
    10-02-2013, 07:57 AM Go to last post
  50. sample and gander

    Hi all, I have a newbie question I'm doing a small research about the prevalence of smoking in diabetic patient. My sample size is 300. However,...

    Started by zendar‎, 10-02-2013 12:54 AM
    • Replies: 0
    • Views: 1,709
    10-02-2013, 12:54 AM Go to last post
  51. 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
  52. Risk Averse

    A store has enough employees to attend to customers that are flowing into it at an average rate of 25 per hour. Should the store manager be employing...

    Started by 17.abhi‎, 09-30-2013 12:13 PM
    probability distribution
    • Replies: 1
    • Views: 1,567
    09-30-2013, 01:38 PM Go to last post
  53. Hypothsis Testing

    In a training center, a new strategy was implemented. After the implementation of this new strategy the training center claimed that on an average...

    Started by 17.abhi‎, 09-30-2013 12:07 PM
    • Replies: 2
    • Views: 1,431
    09-30-2013, 01:30 PM Go to last post
  54. Promo analysis

    Hi everyone, Can you please give a hint on what method I should use to find price anomalies on one market if I have POS data for the entire...

    Started by Ikonanyk‎, 09-30-2013 05:39 AM
    • Replies: 0
    • Views: 2,045
    09-30-2013, 05:39 AM Go to last post
  55. Question Sturges' Formula

    How can I prove Sturges' formula for determining number of classes in frequency distribution? k=Log2n+1 (n=number of data, k=number of classes)

    Started by masumeh‎, 09-27-2013 09:31 AM
    • Replies: 5
    • Views: 30,985
    09-27-2013, 12:01 PM Go to last post
  56. unidimensionality

    I have six constructs. Each construct has several items. Before we do structural equation modeling, I want to check unidimensionality and convergent...

    Started by eunkum‎, 09-27-2013 10:13 AM
    • Replies: 0
    • Views: 2,063
    09-27-2013, 10:13 AM Go to last post
  57. Question Frequency Distribution

    Hi all :wave:. I have a question, that is very important for me! :( It is written in book "basic statistics for business and economics" for...

    Started by masumeh‎, 09-27-2013 07:01 AM
    • Replies: 2
    • Views: 1,501
    09-27-2013, 07:32 AM Go to last post
  58. Unequal sample sizes - one-way ANOVA and MANOVA

    Hello everyone:wave:, I know that unequal sample sizes would confound IVs in factorial design. But how about in one way analysis? How and...

    Started by acchan‎, 09-27-2013 03:51 AM
    • Replies: 0
    • Views: 1,713
    09-27-2013, 03:51 AM Go to last post
  59. Permanova significant four fold interaction. How about 2 and 3 fold interactions?

    Dear, I have a problem considering the analysis of a design with 4 factors. I have a fully crossed design with 4 factors (Su,Sp,Sa,Te). When...

    Started by mrtwino‎, 09-26-2013 06:07 AM
    • Replies: 5
    • Views: 1,733
    09-26-2013, 06:09 PM Go to last post
  60. Which statistical tests should I use?

    Overview of Study: Independent variable: Time Dependent variable: Number of alcohol references in music Three hypotheses: H1: There will be a...

    Started by sprices‎, 09-26-2013 04:02 PM
    • Replies: 0
    • Views: 1,176
    09-26-2013, 04:02 PM Go to last post

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