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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: 18,712
    10-11-2014, 12:02 PM Go to last post
  1. bridge estimation in linear regression

    So the bridge estimates, \beta (which is a vector of \beta_1,...,\beta_p), minimize \sum_{i=1}^n (y_i - x_i^T\beta)^2 +...

    Started by zzzc‎, 11-25-2010 11:53 PM
    • Replies: 0
    • Views: 2,336
    11-25-2010, 11:53 PM Go to last post
  2. brushing up on my basic stats (ANOVA)

    I'm taking a design course that's making me revisit some elementary stats ideas that aren't as sharp as they were a year ago. I want to make sure...

    Started by trinker‎, 09-13-2012 11:24 PM
    anova, ctitique
    • Replies: 1
    • Views: 1,669
    09-20-2012, 12:25 AM Go to last post
  3. Business location statistics.

    I'm interested in researching business statistics and possible factors involved which will determine a good business location. For example, If I am...

    Started by britishchick‎, 05-23-2015 04:11 AM
    • Replies: 0
    • Views: 1,165
    05-23-2015, 04:11 AM Go to last post
  4. Business Research, Stratified Sampling and Data Analysis - Need Advice

    Dear Forum Members I need some advice on designing a statistical research for my dissertation. I hope I have posted my query in the right section....

    Started by GACL212003‎, 10-03-2012 01:28 AM
    • Replies: 1
    • Views: 1,299
    10-05-2012, 11:30 AM Go to last post
  5. Buy-response survey!

    Hello, I'm about to initiate a price research where I'll examine the optimal price for a product. For the method I'm planning to to a...

    Started by kenniwr‎, 09-13-2012 02:59 AM
    • Replies: 0
    • Views: 3,288
    09-13-2012, 02:59 AM Go to last post
  6. By-item random intercepts--to include or not to include?

    We're hoping someone can shed light on this one... :) In experiments involving human subjects, samples are taken from the population. The same can...

    Started by at474‎, 11-10-2009 10:14 AM
    • Replies: 1
    • Views: 2,909
    01-01-2010, 02:46 PM Go to last post
  7. Calculate chance level in multiple choice

    Hello everyone. In short: I would like to know how to compute the chance-level of an 8-alternative multiple choice questionnaire with 6 questions....

    Started by Pernelle‎, 11-08-2015 07:27 AM
    • Replies: 0
    • Views: 2,414
    11-08-2015, 07:27 AM Go to last post
  8. Calculate CI for Var of sum of normally dist variables?

    Hi guys, I'm trying to figure out how to calculate a confidence interval for a variable that is the sum of normally distributed variables. ...

    Started by CJ Rockball‎, 02-02-2014 10:39 AM
    • Replies: 0
    • Views: 892
    02-02-2014, 10:39 AM Go to last post
  9. Calculate Market Share (Lender Reputation)

    Hi All, I urgently need for help regarding a research I am currently doing. I have a panel data set of syndicated loan transactions...

    Started by Tomas1990‎, 06-19-2015 03:54 AM
    • Replies: 0
    • Views: 1,000
    06-19-2015, 03:54 AM Go to last post
  10. Question Calculate Sample size using calculator ?

    Hello Can some one give me formula to calculate sample size using calculator or manually. This data I have right now: Population size = 500...

    Started by hanialbarni‎, 12-25-2014 07:01 PM
    • Replies: 4
    • Views: 2,091
    01-11-2015, 12:00 PM Go to last post
  11. Smile Calculate sample size?

    You are interested in studying the relationship between sodium consumption and the development of hypertension. 32% of Americans are hypertensive...

    Started by Jadan89‎, 08-29-2016 11:28 PM
    effective size, power alpha sample size, sample size
    • Replies: 0
    • Views: 955
    08-29-2016, 11:28 PM Go to last post
  12. Calculate SD from mean and 95% CI

    Dear Friends I'm reading a paper that has the following table: Year, n, measure (SD) 2008, 536 0.25 (0.13) 2010, 536 0.21...

    Started by SiBorg‎, 10-03-2012 03:58 PM
    • Replies: 7
    • Views: 4,600
    10-03-2012, 06:31 PM Go to last post
  13. Exclamation Calculate the r-squared in models with more than one predictor/variable? TRICKY!!!

    Hi there! CAREFUL, my question isharder than it seems! Ok, we all know that r-squared is : one minus (the sum of squares of the residuals...

    Started by kiklefou‎, 12-13-2013 05:32 AM
    • Replies: 0
    • Views: 1,264
    12-13-2013, 05:32 AM Go to last post
  14. Question Calculating a P-value for a two-tailed One-Standard-Deviation chi-square Test

    How does one calculate a P-value for a two-tailed One-Standard-Deviation chi-square Test? Before we begin, I would like to say thank you for...

    Started by damienpf‎, 04-04-2009 12:32 PM
    • Replies: 0
    • Views: 12,182
    04-04-2009, 12:32 PM Go to last post
  15. Calculating a sample size for a study

    Hi, I am trying to do a study on patients with a certain disease. I would like to retrospectively review their charts and check whether there were...

    Started by yr20045‎, 10-23-2010 02:34 PM
    • Replies: 3
    • Views: 2,841
    10-24-2010, 10:24 AM Go to last post
  16. Calculating abnormal returns with the calendar time portfolio approach

    Hey guys, I want to conduct an event study and since there is a lot of overlapping of the observation windows, I want to use the calendar time...

    Started by carlos_eduardo‎, 09-20-2013 03:19 AM
    • Replies: 0
    • Views: 4,632
    09-20-2013, 03:19 AM Go to last post
  17. Calculating and interpreting Spearman's Rank Correlation...

    Hi. I am completing an undergraduate research project and am having a bit of trouble completing the statistical analysis. I'll briefly run through...

    Started by Hedgehog‎, 11-24-2010 01:33 AM
    • Replies: 1
    • Views: 5,812
    12-04-2010, 04:15 AM Go to last post
  18. calculating d'

    I am working on a project using a 3AFC test and am unsure about how to calculate d' in that scenario. Am I still just using Hits/False Alarms as if...

    Started by moonprizim‎, 03-27-2012 08:46 AM
    • Replies: 1
    • Views: 1,455
    03-27-2012, 01:16 PM Go to last post
  19. Calculating Effect Size

    Hi everyone I want to calculate the effect size for the national data with sample size more than ten thousand for the Independent Sample t-test and...

    Started by shafiqurrehman1‎, 05-17-2011 01:01 AM
    • Replies: 7
    • Views: 4,512
    05-24-2011, 11:57 PM Go to last post
  20. Post Calculating Effect Sizes for Meta Analysis

    Hey there! We are conducting a meta analysis (Hunter Schmidt Method) and therefore need to calculate the effect sizes of the different researches...

    Started by socialpsychology‎, 09-18-2014 05:16 AM
    • Replies: 0
    • Views: 1,500
    09-18-2014, 05:16 AM Go to last post
  21. Calculating forecast error for a long-term volatility forecast

    Hi, I am trying to calculate the forecast standard error for a long-term volatility forecast of a time series. I am simply using the unbiased...

    Started by AndrewLong‎, 08-11-2015 05:55 AM
    error, forecast, forecast error, standard error, volatility
    • Replies: 0
    • Views: 993
    08-11-2015, 05:55 AM Go to last post
  22. Calculating likelihood for a particular biological sample. Is is possible?

    Hi you all! I've got a problem when trying to analyze some biological data in my PhD. Let's say that I'm interested in performing an analysis...

    Started by EuGENE‎, 09-29-2015 06:42 AM
    biological statistics, likelihood, likelihood ratio test, non parametric
    • Replies: 0
    • Views: 1,020
    09-29-2015, 06:42 AM Go to last post
  23. Calculating proability

    If the probability of a resulting number being 10 is %80 chance, 5 %50 and -2 %40 what is the most probable outcome(it could be between values) based...

    Started by Noobie‎, 05-26-2011 05:48 AM
    • Replies: 3
    • Views: 2,049
    06-13-2011, 02:37 PM Go to last post
  24. Calculating range

    Dear all This is my first question in this forum. I have 100 over medical data points which was measured in different patients practically....

    Started by kmgraju‎, 04-20-2015 08:52 AM
    • Replies: 2
    • Views: 1,342
    04-21-2015, 09:34 AM Go to last post
  25. calculating sample size

    Hi I am a research project virgin, & I'm having a hard time understanding how you estimate your sample size. My project entails performing a...

    Started by roblox‎, 05-29-2011 02:38 PM
    • Replies: 1
    • Views: 2,556
    06-04-2011, 05:17 AM Go to last post
  26. Calculating Sample Size for a prospective/longitudinal study

    I am an undergraduate conducting a literature review. I am wanting to discuss sample size among the papers I am critiquing. The papers I am...

    Started by Tiffiny‎, 02-05-2012 06:02 AM
    dissertation, power calculation, sample size
    • Replies: 0
    • Views: 3,355
    02-05-2012, 06:02 AM Go to last post
  27. calculating sample size for multi-stage or multiphase experiment

    Hi everyone, I am running into a problem that I'm not sure how to solve. Due to budget constraints, we have 5 companies that are willing to...

    Started by proc1125‎, 09-29-2014 02:02 PM
    • Replies: 0
    • Views: 1,731
    09-29-2014, 02:02 PM Go to last post
  28. Calculating significativity on a preference question.

    E.g.: 200 consumers test 2 different products, 1 after the other. After they tested and evaluated both products, they have to give their preference....

    Started by SteveBaker‎, 05-18-2011 04:20 AM
    preference
    • Replies: 0
    • Views: 1,926
    05-18-2011, 04:20 AM Go to last post
  29. Calculating Smallest Detectable Difference when mean is around 1 and MSE < 1

    Apologies if this is in the wrong forum, and please move if this is the case. Just a query that might be intractable. When calculating Standard...

    Started by rodwhiteley‎, 08-26-2013 03:02 AM
    mse, sdc, sem
    • Replies: 0
    • Views: 2,279
    08-26-2013, 03:02 AM Go to last post
  30. Calculating the bias of variance estimator

    Dear all, I have been given two variance (S^2) estimators, S1 and S2. I am not including the square (^2) as it may cause confusion. And I am to...

    Started by UniApply‎, 03-03-2016 02:29 PM
    • Replies: 9
    • Views: 1,755
    03-03-2016, 10:30 PM Go to last post
  31. Calculating the standard error of an odds ratio from the standard errors of 2 logits

    I've just completed a logistic regression model with a continuous covariate, and calculated the logit and standard errors using SAS for creating a...

    Started by Disvengeance‎, 12-13-2014 09:53 PM
    3 Pages
    1 2 3
    • Replies: 35
    • Views: 8,523
    12-18-2014, 10:02 PM Go to last post
  32. Calculating variance for variable derived from two correlated variables

    Hello, I am analyzing a dataset based on a survey of organic farmers. Among other things, I have data about the farmer's organic seed usage and...

    Started by JaredZystro‎, 08-05-2015 03:41 PM
    • Replies: 4
    • Views: 1,755
    08-07-2015, 04:22 PM Go to last post
  33. Calculating weighted mean & SD from multiple group data

    I have a query regarding the calculation of a weighted mean +/- standard deviation based on a set of group data containing means and standard...

    Started by asf‎, 11-19-2012 08:50 PM
    • Replies: 2
    • Views: 4,763
    11-21-2012, 07:47 PM Go to last post
  34. Calculation of Autocorrelation

    Hello, I have a data set of which i calcualte the autocorrelation at lag 1 in SAS ETS (Proc Arima) and SPSS. Then i try to calculate the...

    Started by zarasandreas‎, 11-18-2011 03:09 AM
    • Replies: 2
    • Views: 5,175
    11-18-2011, 09:36 AM Go to last post
  35. Calibration for COX model

    Hi everyone, I'm looking for the methodology to compute the calibration of the COX model with time-dependent, I found few articles on the net...

    Started by nedjarh‎, 02-09-2011 09:47 AM
    • Replies: 0
    • Views: 3,332
    02-09-2011, 09:47 AM Go to last post
  36. Angry Call response time distribution [Help needed]

    Hello everyone! I'm new to this forum but I want to start off by making a request. The thing is I'm working on a project regarding call-back...

    Started by The_Chosen_One‎, 02-04-2015 07:22 PM
    • Replies: 4
    • Views: 1,389
    02-05-2015, 01:46 PM Go to last post
  37. Can a convenience sample ever be considered truly cross-sectional?

    I'm having a debate over terminology with a colleague. We've done a small census survey (n<50) of residents and staff at a local out-patient clinic....

    Started by BSimon‎, 09-17-2013 07:41 AM
    cross-sectional, definition, design, survey
    • Replies: 4
    • Views: 7,487
    09-18-2013, 07:50 AM Go to last post
  38. Can a Power Analysis be done on a time series?

    I've been doing a lot of reading on the "New Statistics" and I'd be very interested in determining the statistical power of my models based on...

    Started by ouadad‎, 01-22-2013 10:53 AM
    • Replies: 0
    • Views: 1,688
    01-22-2013, 10:53 AM Go to last post
  39. Can anyone explain Poisson regression for doing time trend?

    It would be a big help if someone could give a practical example (by hand) how Poisson regression is used to calculate a time trend line, and...

    Started by daniel_goldman‎, 02-18-2014 04:40 AM
    poisson regression, time trend
    • Replies: 12
    • Views: 6,727
    02-19-2014, 06:52 PM Go to last post
  40. Can anyone help me choose appropriate form(s) of analysis?

    Hi, I was wondering if anyone could possibly help advise me on choosing an appropriate form of analysis I have 2 groups of participants....

    Started by Kenny‎, 10-19-2014 12:05 PM
    • Replies: 6
    • Views: 2,780
    10-23-2014, 03:35 AM Go to last post
  41. Can anyone help please?

    Hi there, for my dissertation I wanted to know the important factors that managers consider in selecting a supplier. I used a likert scale 1-5 from...

    Started by gizmo00‎, 05-08-2011 02:45 PM
    • Replies: 3
    • Views: 1,715
    05-12-2011, 10:59 AM Go to last post
  42. Can Factor Analysis be used for non normal distribution ?

    Hi My questionnaire is based on 300 respondents opinion on the benefits of implementing of policy changes for which I had used5 point Likert's...

    Started by CAShobana‎, 03-31-2015 11:28 PM
    • Replies: 3
    • Views: 1,626
    04-01-2015, 12:43 PM Go to last post
  43. Can fixed effects models deal with nested data?

    I'm reading a paper now: English teacher candidates developing dialogically organized instructional practices (2013) The authors state (LINK...

    Started by trinker‎, 03-08-2013 01:39 PM
    multilevel model
    • Replies: 4
    • Views: 4,467
    03-10-2013, 03:41 PM Go to last post
  44. Can I compare regression results with principal component analysis(PCA)

    I'm trying to analyze survey data ( 31 response data, and 5 variables, dependent variable is non-parametric (distribution free)). I tried to use...

    Started by rosaie‎, 04-29-2014 05:40 PM
    • Replies: 2
    • Views: 1,822
    05-01-2014, 07:28 AM Go to last post
  45. Can I ignore the third independent variable?

    Hi all! Here's some background: I have measured 103 patients' postural steadiness. The independent variables (or within-subject factors) in my...

    Started by Tikkuhirvio‎, 01-16-2012 09:01 AM
    • Replies: 0
    • Views: 2,301
    01-16-2012, 09:01 AM Go to last post
  46. Can I impute an independent variable with a dependent varible?

    I'm building a regression model Y = X1 + X2 + ... + Xn There're about 10% subjects who have missing value on two of the predictors. If I use...

    Started by sunny3333‎, 07-30-2014 06:18 PM
    • Replies: 0
    • Views: 1,225
    07-30-2014, 06:18 PM Go to last post
  47. Can I perform logistical regression on a sample of 28

    Hi there, Would be really grateful of some advice. I have a sample size of 28; 7 of which have a disease of interest. Is it possible to perform...

    Started by EmilyC‎, 02-07-2012 11:17 AM
    • Replies: 1
    • Views: 1,483
    02-07-2012, 11:48 AM Go to last post
  48. Can I test linear trend in a set of point estimates along with their standard errors?

    Hi, I have the following data as an example: time mean s.e. 1 .2 .001 2 .3 .001 3 ...

    Started by sunny3333‎, 03-24-2014 04:58 PM
    • Replies: 2
    • Views: 1,417
    03-26-2014, 07:12 AM Go to last post
  49. Can I use a chi-square test for this 2x3 contingency table?

    Imagine I want to find out whether there are any differences between male and female participants in their pet choices, and this is my 2x3...

    Started by cidyla‎, 07-26-2012 05:17 PM
    chi-square, proportions
    • Replies: 1
    • Views: 19,002
    07-26-2012, 09:30 PM Go to last post
  50. Can I use a Negative Binomial Regression for a Continuous Outcome?

    Hello, My outcome is Sugar intake with a highly skewed continuous outcome variable. The histogram and variable details are Attached. Since the...

    Started by lexareef‎, 03-31-2015 12:40 PM
    • Replies: 0
    • Views: 1,048
    03-31-2015, 12:40 PM Go to last post
  51. Can I use an independent t-test to test for significant differences over time?

    I have a 50 year time series (2012-2062), and I would like to test to see whether sig. differences exist between two groups of data subjected to...

    Started by Miz123‎, 04-15-2017 08:20 AM
    t-test
    • Replies: 0
    • Views: 703
    04-15-2017, 08:20 AM Go to last post
  52. Can I use fishers exact test in this situation?

    You can see in the below table that I have multiple cells that have expected counts <5 and cells with counts equal to zero + zero expected counts. As...

    Started by slamer2000‎, 05-15-2017 01:20 AM
    dichotomous, fishers exact, ordinal and categorical
    • Replies: 9
    • Views: 1,810
    05-22-2017, 08:47 PM Go to last post
  53. Can I use gls if I don't need to use mixed models and var is not structured?

    I have a continuous variable that is related to a covariable linearly. I need to compare this relationship between months (24 months), but the...

    Started by mgow‎, 09-14-2016 08:17 AM
    generalised least squares, heteroscedasticity, independent observations, nlme
    • Replies: 5
    • Views: 1,771
    09-14-2016, 04:01 PM Go to last post
  54. Can I use Partial Eta Squared for t-tests?

    Hi, I am currently trying to decide which effect size is the most appropriate for my results. I have conducted a repeated measures ANOVA, there...

    Started by heather88‎, 05-22-2015 05:47 AM
    effect size., partial eta squared, t-tests
    • Replies: 0
    • Views: 1,148
    05-22-2015, 05:47 AM Go to last post
  55. Can I use regression to increase sample size of survey responders?

    I have a question about how I can extrapolate responses from a survey to apply to the entire population with a decent level of confidence and...

    Started by alebertoni‎, 07-24-2013 08:09 AM
    extrapolation, regression, sample size
    • Replies: 1
    • Views: 1,195
    07-24-2013, 05:26 PM Go to last post
  56. Can I use standard deviation in Likert scale (1-7) data with non normal distribution?

    I have 20 questions, each divided in 6 Likert scale items (1-7), representing 6 different values like Success, Oportunity, etc. The sample is rather...

    Started by nikospss‎, 12-27-2012 04:23 AM
    likert nonparametric
    • Replies: 3
    • Views: 4,757
    12-31-2012, 05:39 PM Go to last post
  57. Can i use the results from a PCA if the matrix is 'not positive definite'

    Hi, I have a 'not positive definite' correlation matrix having done a principal component analysis (PCA) on SPSS. The data i have used is from a...

    Started by shaunx‎, 04-27-2017 03:11 AM
    correlation matrix, factor analysis, pca, pca analysis, spss
    • Replies: 1
    • Views: 735
    04-27-2017, 10:47 AM Go to last post
  58. Can I used a mixed anova for this case?

    I have a study with 1 between-subjects IV (2 levels) and 1 repeated measures IV (3 levels). I am only interested in the between subject main effect...

    Started by rsm‎, 06-26-2014 07:24 AM
    • Replies: 0
    • Views: 1,142
    06-26-2014, 07:24 AM Go to last post
  59. Can Mac process 10GB data?

    I have got a very large dataset and need a computer that has the capacity of processing 10GB data. Is an Mac a good option? Also, what kind of...

    Started by t.wang21@yahoo.com.au‎, 03-05-2013 10:45 PM
    • Replies: 0
    • Views: 1,162
    03-05-2013, 10:45 PM Go to last post
  60. can non parametric tests be modified for one tailed tests?

    Hello all, super newbie here. just a quick question: I have been doing one tailed independent two sample t tests but now on other data I no...

    Started by jesshodgson‎, 03-04-2014 11:54 PM
    • Replies: 3
    • Views: 1,345
    03-05-2014, 04:29 AM Go to last post

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