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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: 19,452
    10-11-2014, 12:02 PM Go to last post
  1. Does the sequential Bonferroni correction method apply to my data?

    The literature on Bonferroni correction methods is confusing me... I have compared means of multiple variables (some dependent, some independent)...

    Started by bearica5‎, 01-07-2014 03:37 PM
    bonferroni, bonferroni correction
    • Replies: 1
    • Views: 2,652
    01-07-2014, 04:56 PM Go to last post
  2. Sample size | Johnson SB distribution

    I have some statistical notions but from one day to the other i was asked to do an analysis that i hope you guys can help me with, since i have no...

    Started by DBCM‎, 01-07-2014 09:28 AM
    • Replies: 1
    • Views: 2,510
    01-07-2014, 09:55 AM Go to last post
  3. Help with Probabilistic Modeling with many elements in simulation with unknown probs.

    I'm wanting to create a probabilistic model based on several simulations, where I have a binary outcome (go or no-go) and a variable input. The old...

    Started by rocketman‎, 01-06-2014 02:14 PM
    binary data, modelling, probability, probability distribution, simualtion
    • Replies: 1
    • Views: 1,319
    01-06-2014, 04:08 PM Go to last post
  4. use of linear predictions from ordered probit as right-hand side variables

    Hi all, Does anyone know if it is OK to use an ordered probit model to predict a latent variable, e.g. self-perceived health; and then use the...

    Started by Judite‎, 01-06-2014 10:19 AM
    latent variable, ordered probit, predictions
    • Replies: 0
    • Views: 1,422
    01-06-2014, 10:19 AM Go to last post
  5. Question Understanding ARIMA

    Hi, I am trying to decompose time series contains approx. 120 observations. Using ARIMA(p,d,q) model I need to find three parameters: d - this one...

    Started by GIS‎, 01-01-2014 08:41 AM
    • Replies: 0
    • Views: 1,493
    01-01-2014, 08:41 AM Go to last post
  6. 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: 1,409
    12-31-2013, 11:13 AM Go to last post
  7. How To Compare And Interpret Output In Cluster Analysis?

    Good Day! I'm currently making my thesis and I'm already on the chapter of analyzing my research findings. I'm using cluster analysis specifically...

    Started by plethoraldork‎, 12-31-2013 03:37 AM
    • Replies: 0
    • Views: 1,888
    12-31-2013, 03:37 AM Go to last post
  8. Factor analysis question

    Hi, I was hoping somebody might be able to help with a question about factor analysis. Is there a problem with putting three different groups (of...

    Started by GaX‎, 12-30-2013 12:32 PM
    • Replies: 1
    • Views: 1,490
    12-30-2013, 12:42 PM Go to last post
  9. Question What statistical test should I use for this data?

    Two groups (group A; group B) are given two treatments (M) and (B), and a control (Control) in different orders. Then the weight of food they consume...

    Started by gunwind‎, 12-30-2013 10:41 AM
    • Replies: 1
    • Views: 2,022
    12-30-2013, 10:46 AM Go to last post
  10. Statistical justification for Cochrans Q please

    Please may someone tell me the proper way to write a statistical justification for a Cochrans Q .. By any chance is it the same a t-test? ...

    Started by AthenaAnkou‎, 12-29-2013 12:50 PM
    • Replies: 4
    • Views: 1,520
    12-29-2013, 06:57 PM Go to last post
  11. Durbin-Watson upper critical value is higher than 2, what now?

    Hi! I have a home assignment in econometrics. I work with Gretl, on the Ramanathan data9-10 datafile. I have done an OLS model with all the input...

    Started by Máté‎, 12-25-2013 12:18 PM
    • Replies: 0
    • Views: 1,529
    12-25-2013, 12:18 PM Go to last post
  12. Lightbulb A question regarding correlation and regression for a seminar

    Hello, Im doing a seminar in which the dependent variable is work centrality which is an interval one. the independent variable is age (ratio),...

    Started by gidlin1‎, 12-25-2013 02:16 AM
    • Replies: 1
    • Views: 3,291
    12-25-2013, 04:01 AM Go to last post
  13. Market potential evaluation

    Objective- evaluate telecom market potential of 40 locations and accordingly rank them based on highest potential. Parameters used: population, my...

    Started by RituSh‎, 12-23-2013 12:10 PM
    • Replies: 1
    • Views: 1,988
    12-23-2013, 12:11 PM Go to last post
  14. Question Crossover design or Randomised Block Design?

    I have two groups of rats (group A and group B). 'Pretreated' means they were injected beforehand (with either memantine or saline). They were then...

    Started by gunwind‎, 12-20-2013 12:44 PM
    • Replies: 2
    • Views: 1,546
    12-22-2013, 07:15 PM Go to last post
  15. Correlation testing of survey results

    Hi there, hopefully this is posted in the right section. If not, I apologise. I have been helping out a local charity to compile and analyse a...

    Started by TheCageybee‎, 12-22-2013 03:05 PM
    • Replies: 0
    • Views: 1,003
    12-22-2013, 03:05 PM Go to last post
  16. BMA (Bayesian Model Averaging ) or a classic fixed effects macro panel ?

    Hey folks I would like your opinion..So I need to decide between a BMA (Bayesian Model Averaging ) or a classic fixed effects macro panel in order to...

    Started by abc‎, 12-22-2013 01:55 PM
    • Replies: 0
    • Views: 1,082
    12-22-2013, 01:55 PM Go to last post
  17. Smile Is Wilcoxon Sign Rank the appropriate test?

    Hi - could anyone help me with this please? I am trying to choose the best statistical test for a problem I have - I am looking at rainfall...

    Started by dbjones1988‎, 12-20-2013 04:04 PM
    wilcoxon signed-rank test
    • Replies: 1
    • Views: 1,320
    12-20-2013, 04:39 PM Go to last post
  18. Methodology for Sample sizes for surveys to multiple branches of a credit union

    Hi, I am reviewing the methodology for sample sizes for surveys that are mailed out to credit union members on a monthly basis. Please forgive...

    Started by lrifoly‎, 12-19-2013 03:36 PM
    sample sizes, surveys
    • Replies: 0
    • Views: 1,140
    12-19-2013, 03:36 PM Go to last post
  19. Type of Stats

    I am new at this - I have to design - on paper - a test to teach reading. I want to do a Pre-Test and Post-Test - compare the differences. I also...

    Started by Zardoz‎, 12-17-2013 04:46 PM
    • Replies: 1
    • Views: 2,116
    12-17-2013, 05:37 PM Go to last post
  20. contingency table

    I'm trying to perform a sample size calculation for a 2x3 contingency table, comparing the mortality rate (expressed as proportion), between three...

    Started by amtdys‎, 12-17-2013 12:22 AM
    • Replies: 0
    • Views: 1,951
    12-17-2013, 12:22 AM Go to last post
  21. Question What statistical test do i need to run?

    Hi there folks, I'm having a little difficulty choosing what statistical test i need to run, I've conducted a series of behavioural experiments,...

    Started by alflo‎, 12-16-2013 06:56 PM
    biology, help me!, statistical test
    • Replies: 0
    • Views: 1,239
    12-16-2013, 06:56 PM Go to last post
  22. ANOVA: )Genre of Series (IV) +Gender (Moderator) effect on Purchase Intention (DV)

    Hey, In my research I have as IV the Genre of the series (comedy vs drama). The moderator is Gender. And I want to see how this effects purchase...

    Started by RaulS1987‎, 12-10-2013 10:30 AM
    • Replies: 4
    • Views: 1,543
    12-16-2013, 11:21 AM Go to last post
  23. Bonferroni correction in multiple linear regressions: HELP NEEDED

    Hi, I'm running the following regression in R for 16000 promotors and one Phenotype (let's say Systolic Blood Pressure, RR_sys): lm (RR_sys ~...

    Started by capocrimini‎, 12-14-2013 08:01 AM
    • Replies: 0
    • Views: 2,761
    12-14-2013, 08:01 AM Go to last post
  24. R packeg of gamm4 mgcv

    kindly guide me about this packeg using

    Started by maqsood.aslam‎, 12-12-2013 10:39 AM
    • Replies: 3
    • Views: 2,061
    12-13-2013, 07:25 AM Go to last post
  25. 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: 1,403
    12-13-2013, 05:32 AM Go to last post
  26. multiple categorical DVs (binary) for repeated measures?

    Dear all I have been looking for ages but I just cant seem to find the appropriate test (in SPSS) for my data... There are two parts to my...

    Started by LisaLondon‎, 12-09-2013 04:20 PM
    • Replies: 0
    • Views: 1,517
    12-09-2013, 04:20 PM Go to last post
  27. Beta error

    Hey guys I really need help from you to calculate the beta error of two different samples. The values are: Average rate of the first sample:...

    Started by Heisenberg‎, 12-09-2013 09:08 AM
    • Replies: 0
    • Views: 714
    12-09-2013, 09:08 AM Go to last post
  28. Paramedic Research - Need help!

    Hello all, I have come across your forum after trying to source some statistic knowledge. I am currently planning a research project which I am...

    Started by davies2201‎, 12-07-2013 10:32 AM
    • Replies: 6
    • Views: 1,349
    12-08-2013, 11:26 AM Go to last post
  29. 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: 1,597
    12-08-2013, 11:21 AM Go to last post
  30. Interpreting (negative) LDA classifier scores

    Hi, I performed an LDA in R using the lda() function. To my knowledge, this implements the LDA by Rao, 1948. From the results I derived the...

    Started by Fiete‎, 12-06-2013 05:40 PM
    • Replies: 0
    • Views: 3,667
    12-06-2013, 05:40 PM Go to last post
  31. Help Please - Multi-Dimensional Interpolation Analysis

    Hi all, I am currently working on a problem that involves a lot of statistics and probability. Unfortunately I have limit expertise in both these...

    Started by kevinbowe2000‎, 12-06-2013 12:47 PM
    • Replies: 0
    • Views: 883
    12-06-2013, 12:47 PM Go to last post
  32. Question about sample size and margin of error

    I am trying to determine if my dataset sample size is large enough to be statistically significant. I'm using a 95% confidence interval. However,...

    Started by zizekkeynes‎, 12-05-2013 01:37 PM
    power, sample size
    • Replies: 3
    • Views: 1,584
    12-06-2013, 02:46 AM Go to last post
  33. Need help determining sample size

    Hi, I've been asked to analyze a tool that gives out quotes to our customers. There was feedback that some of the quotes are wrong and the team...

    Started by nicknguy‎, 11-19-2013 06:44 AM
    power, sample size
    • Replies: 1
    • Views: 1,188
    12-06-2013, 02:31 AM Go to last post
  34. Poll Poll: Poll: ANOVA and Missing Data... what to do?

    basic set up. student shows up at your office with the all-too-common problem of having an unbalanced factorial ANOVA design and asks you what to do....

    Started by spunky‎, 12-05-2013 01:59 PM
    • Replies: 1
    • Views: 1,343
    12-05-2013, 03:01 PM Go to last post
  35. Kaplan Meier and Log Rank

    Hi all, I am doing cognitive testing and the subjects have 20 possible trials to reach criterion (90% accuracy). In my spreadsheet, I have it laid...

    Started by dbh21486‎, 12-05-2013 09:41 AM
    • Replies: 0
    • Views: 1,034
    12-05-2013, 09:41 AM Go to last post
  36. Two sample inference.

    Hi guys, Please help me with this problem. Two types of plastic is suitable for the use by an electronic component manufacturer, The braking...

    Started by Stats_newby‎, 12-04-2013 05:59 AM
    • Replies: 2
    • Views: 1,264
    12-05-2013, 02:49 AM Go to last post
  37. Help with problem for exam, Inference, two sample.

    Hi guys please help me. In an effort to enhance the future reaearch performance, the university decided to classify the academic staff based on a...

    Started by Stats_newby‎, 12-04-2013 05:51 AM
    • Replies: 0
    • Views: 1,076
    12-04-2013, 05:51 AM Go to last post
  38. Regression Assumption

    Why do you need to meet the homogeneity of regression assumption in ANCOVA? If this assumption violates so what happens?

    Started by fayyazcivil‎, 12-04-2013 04:42 AM
    • Replies: 0
    • Views: 1,661
    12-04-2013, 04:42 AM Go to last post
  39. Statistically significant variable in MANOVA calculation -- how do I find the effect?

    I ran a MANOVA analysis followed by a univariate analysis on the individual variables in the MANOVA -- predictor variables were Condition and...

    Started by JoynerCN‎, 12-02-2013 10:32 PM
    • Replies: 0
    • Views: 1,905
    12-02-2013, 10:32 PM Go to last post
  40. Question Problems with some financial time-series

    Hello, For my thesis I was given the assignment to research the effect of macroeconomic news on stocks. I chose to investigate the effect of US...

    Started by HETISFRANK‎, 12-02-2013 06:47 PM
    • Replies: 0
    • Views: 1,252
    12-02-2013, 06:47 PM Go to last post
  41. comparing means

    Hi All, I need a bit of help. I have attached a spreadsheet containing data that I need to analyze. There are two groups - 1 and 2. Each group has...

    Started by jarod347‎, 11-20-2013 12:39 PM
    • Replies: 2
    • Views: 1,842
    12-02-2013, 02:34 PM Go to last post
  42. A simple case that doesn't seem that simple

    I've been trying to find the best solution for my experiment. I don't like that much what my colleagues are using for the statistic test here. So I...

    Started by srd‎, 11-25-2013 06:43 AM
    • Replies: 5
    • Views: 2,292
    12-02-2013, 10:34 AM Go to last post
  43. Question What statistical analysis or methods to use?

    I'm trying to learn a bit here and I'm experimenting on some data I have available. The data is user records with data appended to each record that...

    Started by jonmrich‎, 12-02-2013 10:11 AM
    • Replies: 0
    • Views: 1,280
    12-02-2013, 10:11 AM Go to last post
  44. Question Test-retest duration

    Hi Hi everyone. I'm new here. I have a problem here. I just finished my 1st pilot study on my instrument(questionnaire) and I would like to run...

    Started by razzmatazz5637‎, 11-29-2013 11:33 AM
    • Replies: 2
    • Views: 1,631
    12-01-2013, 02:19 AM Go to last post
  45. Confidence intervals vs. Standard error bars

    I came across this article discussing the topic of confidence intervals and error bars ib plots and thought I'd share: ...

    Started by trinker‎, 11-30-2013 08:22 PM
    confidence interval, standard error bar
    • Replies: 2
    • Views: 2,239
    11-30-2013, 11:46 PM Go to last post
  46. Comparing the mean of two non-random groups

    Students are assigned to group A or B based on two aspects: a grade from an exam and an evaluation of their teacher. Students with both a high grade...

    Started by f3000‎, 11-10-2013 07:46 AM
    • Replies: 1
    • Views: 2,022
    11-30-2013, 10:59 AM Go to last post
  47. question on Monte Carlo simulation

    I have a mean (mu) and its standard error (se) of variable X from the literature. I have a dataset of size n which doesn't have variable X. Now I...

    Started by sunny3333‎, 11-25-2013 03:35 PM
    • Replies: 5
    • Views: 2,024
    11-27-2013, 08:17 AM Go to last post
  48. Question Identify the causes for a phenomenon

    Hi everyone. I would like to investigate the relationship of different factors to a phenomenon. Saying I have traffic accidents (1 or 0) with...

    Started by garybooz‎, 11-26-2013 08:39 PM
    factors, significance
    • Replies: 0
    • Views: 3,986
    11-26-2013, 08:39 PM Go to last post
  49. Picking Statistical Analysis - Does Funding Mitigate Impact of Poverty

    Hi everyone, Thank you in advance for any help you can provide. I am new to the forum and hope to stick around for a while. I am working on...

    Started by JerLon‎, 11-26-2013 09:20 AM
    • Replies: 3
    • Views: 2,053
    11-26-2013, 01:12 PM Go to last post
  50. Relative importance of predictors in logistic regression

    I would like to assess the relative importance of independent variables in a logistic regression model. Previously I have used the 'R' statistic the...

    Started by daisystat‎, 11-26-2013 10:04 AM
    • Replies: 0
    • Views: 1,152
    11-26-2013, 10:04 AM Go to last post
  51. non-mutually exclusive outcomes

    Hi, I have 4 outcomes (A B C D) that one of them is calculated as a weighted average of the first 2 (D=0.6*B + 0.4*C). Then I ran ANOVA to...

    Started by szm‎, 11-22-2013 02:13 PM
    confound, dependence, mutually-exclussive
    • Replies: 1
    • Views: 1,512
    11-25-2013, 11:37 AM Go to last post
  52. Lightbulb measuring correlation over time between two variables

    Hi, For my study, I will administer the same questionnaire 3 different times: the beginning, middle, and the end of the semester. I am interested...

    Started by sivaslieko‎, 11-25-2013 07:26 AM
    correlation, correlational study help, repeated measures, repeated tests, repeated-measures
    • Replies: 0
    • Views: 2,430
    11-25-2013, 07:26 AM Go to last post
  53. p-value for nearest neighbor classification

    Hi all, For the past few days, I have been trying to compute a p-value for some experiment I ran recently, and I simply cannot figure it out. ...

    Started by popolon‎, 11-23-2013 11:57 AM
    • Replies: 4
    • Views: 3,190
    11-24-2013, 03:58 AM Go to last post
  54. help needed (PLEASE) on which statistical analysis to use

    I am looking at the relationship between attachment in childhood and attachment in adult relationships. Attachment in childhood has been measured...

    Started by dgullis‎, 11-22-2013 03:17 PM
    • Replies: 0
    • Views: 1,433
    11-22-2013, 03:17 PM Go to last post
  55. Searching for data reduc

    Hello, I am so confused and so depressed, I hope someone can help. In my Database I have a plenty of datas about 1000 machines. It is to hard to...

    Started by Shari‎, 11-18-2013 12:43 PM
    • Replies: 4
    • Views: 1,294
    11-22-2013, 02:48 PM Go to last post
  56. Hierarchial or mixed models, Dirichlet priors, modelling and inference help...

    Hi, I'm new to Bayesian inference but I have read what I have found about the subject and believe I have an understanding about the basic...

    Started by mastero‎, 11-22-2013 07:11 AM
    • Replies: 0
    • Views: 1,043
    11-22-2013, 07:11 AM Go to last post
  57. Comparison of the cohen's ds of 2 independent studies

    Hello, Is it possible to statistically compare the cohen's d of two studies in order to determine of one of the two Cohen's d is statistically...

    Started by will74lsn‎, 11-21-2013 12:48 PM
    cohen's d
    • Replies: 2
    • Views: 1,763
    11-22-2013, 05:41 AM Go to last post
  58. When is standardisation of data necessary?

    I am running regression analysis and cluster analysis on a data set. The variables differ in their scale of measurement – some variables are ratings...

    Started by daisystat‎, 11-20-2013 03:32 PM
    • Replies: 0
    • Views: 1,217
    11-20-2013, 03:32 PM Go to last post
  59. Standard error of a weighted composite score

    I would like to calculate the standard error of a weighted composite score. The composite score is based on the sum of a respondent's rating to a...

    Started by daisystat‎, 11-19-2013 03:44 PM
    • Replies: 2
    • Views: 3,316
    11-20-2013, 03:10 PM Go to last post
  60. standard error of group means (help please)

    Hi All, I have the following summarized data: month sample size mean variance weight 1 10 ...

    Started by sunny3333‎, 11-19-2013 10:44 PM
    • Replies: 2
    • Views: 1,275
    11-20-2013, 08:17 AM Go to last post

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