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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: 19,431
    10-11-2014, 12:02 PM Go to last post
  1. Need advice regarding Factor analysis for questionnaire design

    Hi! I would greatly apreciate some advice on selecting an appropriate form of factor analysis. Im writing a paper that introduces a new...

    Started by JonasEinar‎, 05-22-2014 07:20 AM
    • Replies: 0
    • Views: 1,848
    05-22-2014, 07:20 AM Go to last post
  2. Kappa coefficient for repeated measures

    Hi Everyone, I know that a kappa coefficient for repeated measures exists, but I didn't find the article in free access (Kraemer HC. Extensions of...

    Started by AkaKiwi‎, 05-22-2014 04:59 AM
    • Replies: 0
    • Views: 2,587
    05-22-2014, 04:59 AM Go to last post
  3. 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: 1,381
    05-21-2014, 09:01 AM Go to last post
  4. Exclamation Which test to use?!?! PLEASE HELP!

    Hi everyone! I have a quick question to ask and quite frankly im slightly confused (maybe because ive over complicated everything in my...

    Started by Emma201‎, 05-16-2014 07:50 AM
    • Replies: 2
    • Views: 1,658
    05-19-2014, 12:18 PM Go to last post
  5. Planned 3x2 Factorial Design - PROBLEM!

    Hi, I'm looking at crop yield in relation to nitrogen supply and chilling duration. My original experimental design was to have two IVs, the...

    Started by carrie266‎, 05-19-2014 11:49 AM
    • Replies: 1
    • Views: 1,905
    05-19-2014, 11:54 AM Go to last post
  6. Making sense of the data...Data analysis

    Dear Experts, I have data for a 12 months study done on 2 wastewater (Plant A and Plant B—Final Effluent and Discharge Point) treatment plants....

    Started by osu‎, 05-17-2014 09:59 AM
    effluent, statistic, statistical analysis, statistical methods, wastewater
    • Replies: 1
    • Views: 1,219
    05-18-2014, 02:46 PM Go to last post
  7. MS Thesis Topic Recommendations from Journals concentrating on Parametric Tests

    I would like to know if you can recommend sites where journals, particularly statistical researches, can be viewed completely. Alternatively, can you...

    Started by iamflozum‎, 05-17-2014 10:24 PM
    parametric, recommendation, simulation, thesis
    • Replies: 0
    • Views: 1,330
    05-17-2014, 10:24 PM Go to last post
  8. Is MANOVA the correct way?

    Hi all, In my research, I have values for 7 (+ 1 for reference) devices that measured the (walking) steps at the same time (so that I would be...

    Started by Yugi_oh‎, 05-17-2014 05:25 AM
    • Replies: 0
    • Views: 1,327
    05-17-2014, 05:25 AM Go to last post
  9. Statistical Significance - Comparing subpopulations to populations

    I have a bit of an exploratory question that I would like an answer to if possible. I'm taking a sample of a sub-population (say, Colorado) and...

    Started by jmc‎, 05-15-2014 03:14 PM
    • Replies: 1
    • Views: 1,258
    05-15-2014, 04:12 PM Go to last post
  10. ROC curve induced madness

    Calling all fellow egg heads I’m getting obsessed with ROC curves. Why is the horizontal axis of specificity flipped to 1 – specificity (false...

    Started by smiddycent‎, 05-14-2014 03:51 AM
    • Replies: 1
    • Views: 1,482
    05-14-2014, 10:57 AM Go to last post
  11. Fixed/Random Effects model v. OLS Regression with dummies

    Hello everyone! :wave: I have three consecutive waves of panel data with which I will be estimating incomes based on the Mincer equation. I have...

    Started by Kabouterke‎, 05-13-2014 06:01 PM
    • Replies: 2
    • Views: 1,940
    05-13-2014, 10:49 PM Go to last post
  12. Convert SD and confidence intervals

    Hi I want to perform a meta analysis on pain outcomes. Some studies use a 0-10 scale, others 1-10, 0-100 or 1-100. I'd like to convert the...

    Started by benedsmith@hotmail.com‎, 05-12-2014 11:32 AM
    • Replies: 0
    • Views: 1,510
    05-12-2014, 11:32 AM Go to last post
  13. Correlation of two dependent variables

    Hi all! I have a small data set which contains two tissue samples from ~20 patients. Each patient has contributed a tissue sample from left and...

    Started by arkiaamu‎, 05-09-2014 01:26 AM
    • Replies: 0
    • Views: 2,338
    05-09-2014, 01:26 AM Go to last post
  14. Exclamation How to interpret Spearman's correlation between Likert-scale questions?

    Hi there! I have a question regarding the correlation of different statements. I would appreciate any help! How can I interpret this correlation?...

    Started by Isis66‎, 05-08-2014 05:07 PM
    correlation, likert, spearman
    • Replies: 0
    • Views: 2,713
    05-08-2014, 05:07 PM Go to last post
  15. ANOVA or MANOVA

    Hi, I have a question on which statistical test to use for 2 separate problems: 1) I have 4 different groups, 1A, 1B, 2A and 2C and have 3...

    Started by Anna12‎, 04-21-2014 12:13 PM
    anova, manova
    • Replies: 1
    • Views: 2,019
    05-07-2014, 05:41 AM Go to last post
  16. Lightbulb Which analysis fits this research?

    Hi everyone! Apparently, evertbody in the forum seems to have quite some knowledge already, while I am only posting a rather easy questoin. I...

    Started by Wiebke.90‎, 05-07-2014 03:05 AM
    • Replies: 0
    • Views: 1,244
    05-07-2014, 03:05 AM Go to last post
  17. New to the group-Need suggestion to analyse the data

    I have a database: Interstate ADT(avg daily traffic) IRL 1yrRL 2ndyrRL...5thyrRL I-95 15000-25000 (800) (750) (650) (340) ...

    Started by yasharif‎, 05-05-2014 07:52 AM
    • Replies: 1
    • Views: 1,519
    05-05-2014, 12:23 PM Go to last post
  18. Rsearch Design

    Hi, I am currently writing my dissertation. My lecturer told me my research design is repeated measure with multiple groups, however she is...

    Started by Sharpshooter‎, 05-03-2014 04:42 PM
    repeated measure anova, research design, t-test
    • Replies: 1
    • Views: 1,405
    05-04-2014, 04:10 PM Go to last post
  19. composite variables

    Dear users, I have a question regarding the calculation of a composite variable out of 5 individual variables which I want to use in a MANOVA...

    Started by DonJ‎, 05-03-2014 12:02 PM
    • Replies: 1
    • Views: 1,278
    05-03-2014, 03:55 PM Go to last post
  20. 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: 3,287
    05-02-2014, 05:10 PM Go to last post
  21. Balancing data

    A couple of classification (lets stick to only two groups for simplicity) models are performing better if we balance the data when there are few...

    Started by Englund‎, 05-01-2014 02:32 PM
    • Replies: 3
    • Views: 1,142
    05-02-2014, 01:18 PM Go to last post
  22. Matched Cohort (using 2 different matching methods)

    I have a question about whether something could be considered acceptable or not (I have feeling I really shouldn't do this but I do not have tons of...

    Started by lancearmstrong1313‎, 05-02-2014 06:38 AM
    • Replies: 0
    • Views: 1,825
    05-02-2014, 06:38 AM Go to last post
  23. meta-analysis combined p-value from different tests

    I want to examine whether the students of School A have done significantly better than the students of School B in science subjects. In Math, School...

    Started by subhode‎, 05-01-2014 12:38 PM
    fisher's z-transformed, meta analysis, meta-analysis, p-values
    • Replies: 0
    • Views: 1,858
    05-01-2014, 12:38 PM Go to last post
  24. Using CAPM as an underlying model to find anomalies in data

    I have data on returns for a certain type of stock (we shall call it class A) for several markets, market return data and the risk free rates over...

    Started by ineedhelpineedhelp‎, 05-01-2014 12:36 PM
    • Replies: 0
    • Views: 973
    05-01-2014, 12:36 PM Go to last post
  25. 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: 1,947
    05-01-2014, 07:28 AM Go to last post
  26. SEM: How to Label path diagram and translate it into Equations

    Hei hou I'm new here. So hello everybody. I have a problem. It's about SEM (structural equation model). I have to lable a path diagram...

    Started by mejorixx‎, 04-30-2014 02:51 AM
    • Replies: 4
    • Views: 1,324
    04-30-2014, 07:03 PM Go to last post
  27. ROC plotting

    I am a true novice of statistics, so would be grateful of easy explanations, as I am trying to create an ROC curve, and understand how to do it...

    Started by statsconfused‎, 04-30-2014 04:04 PM
    • Replies: 2
    • Views: 1,418
    04-30-2014, 06:58 PM Go to last post
  28. observed number & expected number

    I did a chi-square analysis. Could you kindly answer the following question? My observed number is the same as my expected number. How can I...

    Started by eunkum1‎, 04-30-2014 03:25 PM
    • Replies: 0
    • Views: 1,341
    04-30-2014, 03:25 PM Go to last post
  29. GLM on bimodal Data possible?

    Hello, I've got data, in which the target variable is bimodally distributed. The target variable is also bimodally distributed conditional on the...

    Started by consuli1‎, 04-29-2014 03:57 PM
    • Replies: 0
    • Views: 2,591
    04-29-2014, 03:57 PM Go to last post
  30. Mathematical formulation of algorithms

    Hello, I am working with ecological time series data (15 minutes interval = 96 measurements / day), i.e. measurements of tree stem dimension...

    Started by ManensFavn‎, 04-29-2014 04:17 AM
    • Replies: 1
    • Views: 1,767
    04-29-2014, 11:22 AM Go to last post
  31. What does component signifies in Principal component analysis?

    Structure Matrix ......................................Component ...................................1 ..... 2 .....3 ......4 ...

    Started by rahul_panthri‎, 04-29-2014 06:35 AM
    • Replies: 5
    • Views: 1,570
    04-29-2014, 08:43 AM Go to last post
  32. 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: 1,545
    04-28-2014, 03:55 PM Go to last post
  33. Research about stock comovements due to similar ticker symbols

    Dear all, I have a small question about a small research that I wanted to do regarding stock symbol similarities and their abnormal returns. I...

    Started by bsc.j.j.w‎, 04-24-2014 06:51 PM
    • Replies: 7
    • Views: 1,895
    04-26-2014, 07:31 PM Go to last post
  34. obtaining an unbiased estimator for the min: x_(1)

    How would I go about finding an unbiased estimator for the minimum order statistic for a given PDF and distribution. Example: ...

    Started by revans.evans‎, 04-24-2014 10:25 PM
    biased estimator, estimation
    • Replies: 4
    • Views: 1,367
    04-25-2014, 10:30 AM Go to last post
  35. Statistical Hypothesis - (help needed)

    hi Pro :) can someone help me out with below questions? Question 1: A report prepared by the Economic Research Department of a bank has...

    Started by y1m43‎, 04-25-2014 02:15 AM
    • Replies: 0
    • Views: 1,230
    04-25-2014, 02:15 AM Go to last post
  36. Multivariate Normality

    I have a data set I am going to use SEM on. Each of the variables seems to have acceptable skewness and kurtosis (using cutoffs of 3 and 10 on...

    Started by xralphyx‎, 10-03-2012 09:59 AM
    • Replies: 2
    • Views: 5,455
    04-25-2014, 01:03 AM Go to last post
  37. Choosing right ANOVA & how to input data

    Hi, Need help with an issue. I'm not quite sure how to input the data I've collected and I'm guessing I should use ANOVA RM, but not 100% sure...

    Started by Conxile‎, 04-24-2014 02:56 PM
    • Replies: 0
    • Views: 884
    04-24-2014, 02:56 PM Go to last post
  38. multiple paired t-test or repeated measures ANOVA

    Hello, I have the following problem: I want to compare different things for people with a foot problem and I measured comparable things for...

    Started by pinkbear‎, 04-24-2014 04:55 AM
    • Replies: 0
    • Views: 1,081
    04-24-2014, 04:55 AM Go to last post
  39. Meta Analysis Question: Is this even possible?

    Here's the situation: a colleague has a stats consultant who is saying the following type of meta-analysis is possible. He has replicated a study...

    Started by metageek‎, 04-23-2014 07:18 PM
    • Replies: 4
    • Views: 1,329
    04-23-2014, 08:56 PM Go to last post
  40. 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: 1,085
    04-22-2014, 08:52 PM Go to last post
  41. Scetterplot of ZPRED vs. ZRESID in Multiple Regression

    Hi, I was wondering if any could help interpret my scatterplot in terms of homoscedasticity and independence of errors. I can't quite tell whether...

    Started by Gemma12‎, 04-22-2014 12:26 PM
    • Replies: 0
    • Views: 3,107
    04-22-2014, 12:26 PM Go to last post
  42. model selection - keeping binned and continous version of variables in same model

    Hello, I have a dataset of about 160,000 observations and I'm trying to build a binary classifier. Lets call my variable to be classified Y and my...

    Started by Ctiger06‎, 04-22-2014 09:37 AM
    • Replies: 1
    • Views: 1,112
    04-22-2014, 09:49 AM Go to last post
  43. Question Choosing the best combination

    I am conducting a research where I am trying to separate heart and lung sounds using wavelet analysis. In this research I have to use different...

    Started by xerox01‎, 04-22-2014 12:56 AM
    • Replies: 0
    • Views: 850
    04-22-2014, 12:56 AM Go to last post
  44. Measurement error and correlation coefficients: a social-sciency approach...

    hello everyone! yesterday's chat on measurement error and regression made me think that it would be nice to demonstrate (from a social-science-like...

    Started by spunky‎, 04-19-2014 06:44 PM
    • Replies: 0
    • Views: 1,972
    04-19-2014, 06:44 PM Go to last post
  45. 3x2 design - data analysis ANOVA/MANOVA? How to add interaction in the model?

    Hello, Discription of experiment I am researching "The effect of review valence and brand commitment on consumer's purchase intention" for my...

    Started by Stefan Stefanov‎, 04-19-2014 07:25 AM
    anova, interaction effect, manova, model fit, spss
    • Replies: 0
    • Views: 4,223
    04-19-2014, 07:25 AM Go to last post
  46. Question VAR model definition

    Edit: Question Answered. Instead, could you please tell me how can I delete a topic once I post it, if that's possible. Cheers Greetings, I have...

    Started by Athinagoras‎, 04-18-2014 09:56 AM
    autoregressive, var, vector
    • Replies: 0
    • Views: 1,292
    04-18-2014, 09:56 AM Go to last post
  47. within-subject factor

    RQ: Is there an effect of the number of PEmax maneuvers on EMG amplitude? PEmax(within-subject factor: base, fatigue, rest), EMG amplitude...

    Started by eunkum1‎, 04-17-2014 10:23 AM
    • Replies: 0
    • Views: 920
    04-17-2014, 10:23 AM Go to last post
  48. Question Statistical test advice, currently thinking a MANOVA test.

    Hi, I'm sorry to bother everyone. I am collecting samples (continuous data) from 5 defined sites which can be split into 5 categories (A-E) (1...

    Started by Kututo‎, 04-16-2014 09:48 AM
    • Replies: 1
    • Views: 1,367
    04-17-2014, 08:07 AM Go to last post
  49. if weighted average is too small

    I have a metric in % and another column with the Number of accounts for each row. I created a weighted average using rhe 5 metric and the number of...

    Started by podarum‎, 04-15-2014 12:40 PM
    • Replies: 0
    • Views: 1,030
    04-15-2014, 12:40 PM Go to last post
  50. posthoc test for a within-subject factor

    I am doing MANOVA. I have a within-subject factor "fatigue". One variable is fatigue (baseline, fatigue, rest). One of the dependent variables is the...

    Started by eunkum1‎, 04-15-2014 09:51 AM
    • Replies: 0
    • Views: 988
    04-15-2014, 09:51 AM Go to last post
  51. chi-square

    I need to know if severely (all 52) depressed women more/less likely to commit violent /other crimes. How can I do Chi-Square with Fisher Exact Stat...

    Started by eunkum1‎, 04-10-2014 01:43 PM
    • Replies: 2
    • Views: 1,067
    04-10-2014, 05:09 PM Go to last post
  52. one sample t-test alternative

    Hello, I hope someone can help me, because I am getting crazy with this. Imagine the following scenario: I have several participants. Each...

    Started by ajestudillo‎, 04-09-2014 11:41 AM
    • Replies: 13
    • Views: 2,363
    04-10-2014, 07:08 AM Go to last post
  53. Which one should I trust : shapiro test or qq plot?

    Good evening everyone, Sorry if this question already exist, I searched but didn't find an asnwer. I am using 7-points likert scale for my...

    Started by typhoss‎, 04-08-2014 08:39 PM
    • Replies: 3
    • Views: 2,014
    04-09-2014, 05:02 PM Go to last post
  54. Post Model Verification: Verification of Environmental Dispersion Model

    I am working with an environmental dispersion model, that I am trying to verify with measured data. We have a six receptors (measurement stations) in...

    Started by Skyence‎, 04-09-2014 03:24 PM
    distributions, model validation, probability
    • Replies: 0
    • Views: 1,622
    04-09-2014, 03:24 PM Go to last post
  55. Exclamation Picking the correct test, need help urgently!

    Hello, I feel like the answer for this is probably really obvious but I am being missing it altogether. This is my data: Habitat Associating Not...

    Started by Annielk‎, 04-09-2014 09:16 AM
    assumptions, chi sq, independance, statistics
    • Replies: 3
    • Views: 1,232
    04-09-2014, 12:35 PM Go to last post
  56. Appropriate statistics where dataset contains only positive cases?

    Sorry if this sounds confusing or uses the wrong terminology, I'll do my best to explain. I have a data set of approximately 100 records, where...

    Started by spss_n00b‎, 04-07-2014 10:05 AM
    • Replies: 4
    • Views: 1,925
    04-08-2014, 02:51 PM Go to last post
  57. structuring a proof

    I am working on a problem to show that the non central f distribution is a generalization of the f distribution. I understand this conceptually but...

    Started by the42up‎, 04-08-2014 09:44 AM
    • Replies: 5
    • Views: 1,835
    04-08-2014, 10:12 AM Go to last post
  58. Research process

    Question 1: A researcher assumes that there is a correlation between the happiness of people and the welfare of the state they live in. How would...

    Started by Tadele‎, 04-08-2014 07:41 AM
    • Replies: 1
    • Views: 1,426
    04-08-2014, 08:28 AM Go to last post
  59. Student's T-test versus one-way ANOVA

    I need help on deciding which statistical test to report. This is not really a statistics problem per say, I've done the calculations already. My...

    Started by GrungyGoose‎, 04-05-2014 10:17 PM
    anova, students t test
    • Replies: 1
    • Views: 3,340
    04-06-2014, 09:45 AM Go to last post
  60. Trend index

    Hi I am looking for an index to understand if the trend of the distribution of a single variable is positive or negative and how quick is...

    Started by luca‎, 04-05-2014 05:32 AM
    • Replies: 2
    • Views: 1,727
    04-06-2014, 05:29 AM Go to last post

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