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Threads 1621 to 1680 of 3193

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: 18,695
    10-11-2014, 12:02 PM Go to last post
  1. Markov Chain Prediction with unknown states

    down vote favorite 2 I want to make a prediction of the next state based on a training and test dataset. So I split my data into a train and...

    Started by killver‎, 01-28-2013 10:56 AM
    markov, markov chain, prediction
    • Replies: 0
    • Views: 1,446
    01-28-2013, 10:56 AM Go to last post
  2. Empirical QQ-plots for binomial GAM?

    Hello everybody I've nearly finished my first binomial GAM analysis (presence absence data). I've been looking for ways to validate my models....

    Started by miriamb‎, 01-28-2013 03:45 AM
    • Replies: 0
    • Views: 1,863
    01-28-2013, 03:45 AM Go to last post
  3. 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: 1,505
    01-28-2013, 02:12 AM Go to last post
  4. Interpretation of correlation coefficient

    Hello, I am working on a meta-analysis with the program R. Here I am investigating the relationship between the dependent variable "participation...

    Started by Stat_Prob‎, 01-24-2013 08:58 AM
    correlation coefficient, fisher's z-transformed, meta-analysis, r-program
    • Replies: 7
    • Views: 1,478
    01-24-2013, 01:29 PM Go to last post
  5. Are two distributions different? First dist.'s mean = 0 (none there, or low level)

    For the most part, when there are two distributions with continuous, positive means, it is straightforward to test if they are equal (t-test,...

    Started by massSpec‎, 01-24-2013 11:07 AM
    • Replies: 0
    • Views: 1,811
    01-24-2013, 11:07 AM Go to last post
  6. Correlation vs ANOVA

    Hi, I am trying to figure out which type of statistics to use for my research project. My knowledge of stats is limited so hopefully this makes...

    Started by Bri‎, 01-23-2013 02:11 PM
    correlation analysis
    • Replies: 6
    • Views: 12,652
    01-23-2013, 04:18 PM Go to last post
  7. 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: 1,680
    01-22-2013, 10:53 AM Go to last post
  8. categorical variable as covariate in ANOVA?

    Hi, I have a within-subject factor with 3 levels and find no main effect when I do an ANOVA. I kind of predict that this is due to the...

    Started by OS449‎, 01-19-2013 09:31 AM
    • Replies: 1
    • Views: 3,081
    01-22-2013, 10:47 AM Go to last post
  9. Post Ratios of dependent variables

    Hello, I am conducting some research into tool marks. I have two sets of tool marks (A) and (B). I am trying to ascertain whether the tool...

    Started by bman‎, 01-22-2013 08:53 AM
    • Replies: 3
    • Views: 1,509
    01-22-2013, 10:08 AM Go to last post
  10. ANOVA and quadratic terms?

    Hello everyone! I have what I think is a relatively straight-forward 3-way factorial ANOVA design. One of my factors (which is "number of...

    Started by will22‎, 01-21-2013 06:38 PM
    • Replies: 7
    • Views: 4,771
    01-21-2013, 11:33 PM Go to last post
  11. 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: 2,872
    01-17-2013, 05:15 PM Go to last post
  12. How to predict a model with multiple factors?

    Hi, My question is probably trivial but I cannot figure it out... I'm doing a glm with multiple continuous and categorical predictors. In R, the...

    Started by Oritteropus‎, 01-16-2013 09:59 AM
    glm, predictions
    • Replies: 0
    • Views: 1,400
    01-16-2013, 09:59 AM Go to last post
  13. Assistance with Statistical Methodology to address research problems

    Im looking for some help with a statistical method(s) that can support the research questions i am looking to answer. I am basically doing research...

    Started by blueshark12‎, 01-15-2013 03:24 PM
    methodology, parametric model, statistical research, utaut
    • Replies: 1
    • Views: 1,482
    01-15-2013, 04:08 PM Go to last post
  14. Multiple regression with correlated predictors to check for explained variance

    Hi all, I have two predictive and one response variable and I'm trying to develop a model for predictions. Both predictors fit well (one slightly...

    Started by Oritteropus‎, 01-14-2013 12:15 PM
    multiple regression
    • Replies: 3
    • Views: 1,595
    01-15-2013, 03:30 AM Go to last post
  15. Log-likelihood MLE Markov chain

    Hey! I am currently working with Markov chains and calculated the Maximum Likelihood Estimate using transition probabilities as suggested by...

    Started by killver‎, 01-14-2013 09:39 AM
    chain, likelihood, markov, mle
    • Replies: 0
    • Views: 1,760
    01-14-2013, 09:39 AM Go to last post
  16. Assumption of variables for Factor Analysis

    Hi, In wikipedia page of Factor Analysis it states:Suppose we have a set of p observable random variables. Does it mean that we can use this method...

    Started by Fred_a‎, 01-13-2013 01:05 PM
    factor analysis, random variables
    • Replies: 2
    • Views: 1,389
    01-13-2013, 03:04 PM Go to last post
  17. What are all the research areas with a core focus on time series applications?

    I want to do an applied time series research paper outside of finance/economics. My question to you guys is what are all the areas where applied time...

    Started by derksheng‎, 01-12-2013 12:30 PM
    • Replies: 0
    • Views: 1,139
    01-12-2013, 12:30 PM Go to last post
  18. Analyzing Gentrification with Data

    Hello, I am developing a masters thesis which will attempt to utilize census tract data to assess the occurrence of gentrification in Washington,...

    Started by mryan13‎, 01-11-2013 07:32 PM
    data, gentrification, statistics
    • Replies: 0
    • Views: 1,289
    01-11-2013, 07:32 PM Go to last post
  19. Factor Analysis vs. Principal Component Analysis

    I've asked this question on here a while back but didn't quite get an answer that helped me understand what is truly different about these two...

    Started by lancearmstrong1313‎, 01-02-2013 01:50 PM
    • Replies: 8
    • Views: 4,136
    01-09-2013, 07:31 PM Go to last post
  20. Suggestions for market research books

    Dear All, Can anybody suggest me useful market research books? Thank you.

    Started by masarimk‎, 12-25-2012 01:34 PM
    • Replies: 1
    • Views: 2,259
    01-09-2013, 01:26 PM Go to last post
  21. How to reduce number of variables using PCA analysis ?

    I would like to reduce the number of variables to add to the regression model. I have too many variables in relation to my samples. I have done PCA...

    Started by dada‎, 01-08-2013 02:59 PM
    • Replies: 3
    • Views: 6,555
    01-08-2013, 06:19 PM Go to last post
  22. Unhappy mixed model nested ANOVA

    I have been trying to run a three factor ANOVA in Statistica 8.0. My experimental design leads to nested, random and non-random factors: Site ...

    Started by sam2334‎, 01-07-2013 09:36 AM
    anova, mixed model, nested design, statistica
    • Replies: 0
    • Views: 1,843
    01-07-2013, 09:36 AM Go to last post
  23. about random walk Metropolis algorithm

    Our model is: Y is distributed from a Negative binomial(r,p) where log(p/1-p)=xb. The prior of b is a multivariate normal(mu0,...

    Started by zzeta35‎, 01-06-2013 04:45 PM
    r code, rwm
    • Replies: 3
    • Views: 2,191
    01-06-2013, 07:50 PM Go to last post
  24. How to deal with a categorical response and continuous and categorical predictors?

    Hi all, I have a large dataset of categorical and continuous variables, the observations are animal species. I want to test which variables are more...

    Started by Oritteropus‎, 12-29-2012 12:35 PM
    categorical variables, classification-tree, discriminant analisys, phylogenetic signal, random forest
    • Replies: 2
    • Views: 2,166
    01-02-2013, 02:23 AM Go to last post
  25. 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: 4,744
    12-31-2012, 05:39 PM Go to last post
  26. Transforming a whole dataset

    Dear all, I would like to transform my dataset, and can not do it manually since I have to many cases. I have a dataset with the following...

    Started by Mathis‎, 12-27-2012 12:43 PM
    • Replies: 7
    • Views: 2,269
    12-29-2012, 10:11 AM Go to last post
  27. Do you need to satisfy assumptions in regression if you do 10-fold cross-validation?

    I wanted to get your opinion on this. When building models we want to make sure that the variables we have selected can be used in a model to predict...

    Started by micdhack‎, 12-23-2012 05:26 AM
    • Replies: 10
    • Views: 2,434
    12-29-2012, 06:48 AM Go to last post
  28. Two way Anova+post hoc tests plz help

    I have three treatment groups I II &III, i tested rate of wound healing in the three gps vs several variables using the two way anova ,gender...

    Started by Dina‎, 12-29-2012 03:44 AM
    • Replies: 0
    • Views: 2,192
    12-29-2012, 03:44 AM Go to last post
  29. Multinomial Logistic Regressions in SPSS

    Hello everybody! First of all, this is a repost, I don't know what happened with the original (maybe a mod deleted it without noticing me). ...

    Started by lapive‎, 12-22-2012 05:58 AM
    multinomial regression
    • Replies: 1
    • Views: 2,498
    12-25-2012, 11:25 AM Go to last post
  30. The joint normality of the two estimates for linear regression model

    I have a different opinion with my colleagues on this question. Could someone help us to clarify this issue? Y = X_1\beta_1 + X_2\beta_2 +...

    Started by waynetang‎, 12-21-2012 12:46 PM
    • Replies: 13
    • Views: 3,106
    12-22-2012, 12:27 PM Go to last post
  31. Sample Size - Mathematical proof

    Hi, I am currently trying to find out the mathematical proof for my chosen sample size. I have referred to the table below and found out that my...

    Started by jpv90‎, 12-06-2012 09:16 AM
    • Replies: 2
    • Views: 3,104
    12-21-2012, 11:53 AM Go to last post
  32. need help with research paper

    Hello! I apologize in advance for being "statistically" dumb. I am writing a research paper, very brief one for 3000 words. Basically, it's...

    Started by angiar87‎, 12-20-2012 02:33 PM
    • Replies: 0
    • Views: 1,222
    12-20-2012, 02:33 PM Go to last post
  33. Comparison of Revenue Variances

    I'm a non statistical type who needs help to determine the right model to test the following scenario: I have ten stores that are all alike, in...

    Started by amg123‎, 12-20-2012 01:16 PM
    • Replies: 0
    • Views: 1,774
    12-20-2012, 01:16 PM Go to last post
  34. Zero Inflated LOGISTIC Regression?

    Hello all, I recently gave a presentation describing my use of logistic regression (YES/NO response variable) and someone suggested that because...

    Started by lancearmstrong1313‎, 12-19-2012 07:34 AM
    • Replies: 2
    • Views: 10,042
    12-19-2012, 09:09 AM Go to last post
  35. which type of ANOVA?

    N mineralisation is dependent variable. Management type (4 types) and position in valley (3 positions; nested in valley (with valley nested in...

    Started by Lolali‎, 12-18-2012 08:21 PM
    anova, factorial anova, nested anova, program r, repeated measures anova
    • Replies: 2
    • Views: 1,820
    12-19-2012, 07:35 AM Go to last post
  36. Levene's test of equality of error variances Repeated measures

    Hello all, RE: Levene's test of equality of error variances Repeated measures...What do I do if one of my time points is significant (not equal...

    Started by cherries‎, 12-18-2012 04:18 PM
    • Replies: 0
    • Views: 3,314
    12-18-2012, 04:18 PM Go to last post
  37. Which statistical data analysis test(s) should I be using?

    Please Help! I want to see if there is an effect of treatment (independent, fixed, continuous, 4 different types) on soil properties (dependent,...

    Started by Lolali‎, 12-18-2012 02:20 PM
    • Replies: 0
    • Views: 1,293
    12-18-2012, 02:20 PM Go to last post
  38. Minimum # of ____ in SPORTS

    Hello all, I am working on something that does not actually involve sports but my situation is exactly like something often used in sports...

    Started by lancearmstrong1313‎, 12-17-2012 11:55 AM
    • Replies: 3
    • Views: 2,080
    12-18-2012, 07:59 AM Go to last post
  39. LGC with Experimental Manipulations

    Hey gang, first time posting. So, I have 9 time points of continuous learning data for 200ish people. I also have two manipulations (thus the 200...

    Started by John.kostek‎, 12-13-2012 03:44 PM
    lgc modeling, lisrel, manipulations, sem
    • Replies: 6
    • Views: 1,790
    12-17-2012, 11:49 AM Go to last post
  40. What's the name of this distribution? (pdf ~ gaussian times x)

    Hi My apologies if this a simple question but, despite extensive searching, I seem unable to find an answer and I don't know the correct terms to...

    Started by kuoris‎, 12-14-2012 07:54 AM
    • Replies: 4
    • Views: 1,230
    12-17-2012, 03:14 AM Go to last post
  41. Need clarification on ANCOVA's assumption of linearity - how strict is it?

    Dear forum members, I need help understanding whether or not a data set in which there is no relationship between the dependent variable (DV) and...

    Started by Neophyte‎, 12-15-2012 02:16 PM
    • Replies: 0
    • Views: 1,574
    12-15-2012, 02:16 PM Go to last post
  42. Interval independent variable in binary logistic regression

    Hi everyone: I am a bit new to logistic regression and I could use some advice. I am trying to discover the influence of various variables on...

    Started by Dan23‎, 12-15-2012 07:44 AM
    logistic regression, regression, regression equation, regression model
    • Replies: 0
    • Views: 1,555
    12-15-2012, 07:44 AM Go to last post
  43. Probability question for an archaeological case

    Hi Guys, I would appreciate to have help on the following. I have no extensive math background, so I can anticipate that I can only limit myself to...

    Started by gianmarco‎, 12-13-2012 11:49 AM
    • Replies: 6
    • Views: 1,484
    12-15-2012, 02:19 AM Go to last post
  44. 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: 1,634
    12-14-2012, 05:24 AM Go to last post
  45. HLM-Longitudinal Analysis: Moderation in level 2 variables?

    Hi, I am creating a growth model using HLM 7 where Level 1 is Occasion and Level 2 is Person. I am trying to see if I can test the moderation...

    Started by Blair‎, 12-11-2012 07:11 PM
    growth model, hlm, longitudinal, moderation
    • Replies: 0
    • Views: 2,983
    12-11-2012, 07:11 PM Go to last post
  46. Hierarchical Linear Modeling

    I have a question about independent variables in HLM. Does it matter if they are dichotomous or continuous? Are there any advantages to dichotomizing...

    Started by ecotrone23‎, 09-04-2009 11:28 PM
    • Replies: 1
    • Views: 2,315
    12-11-2012, 07:02 PM Go to last post
  47. Help Calculating Significance Between 5 Elementary School Data

    Hello, I am a school administrator in Oklahoma. I have five small elementary schools in my district. I often here from each of them that their...

    Started by rdarr‎, 12-08-2012 09:54 AM
    • Replies: 2
    • Views: 1,420
    12-11-2012, 08:46 AM Go to last post
  48. Question Survey Question with 4 Point Likert Scale and Yes/No Question

    Thank you for taking the time out to view my problem. My survey is based on observations and interviews. The observation questions are yes/no type...

    Started by newbie4‎, 12-07-2012 01:24 PM
    calculation, likert scale, yes/no scaling
    • Replies: 4
    • Views: 14,912
    12-10-2012, 01:39 PM Go to last post
  49. Error Analysis with Binned Data

    Our income data comes in increments of $5,000 from $15,000 onward. The [$0 to $15,000) is one way too big of a bin. In any case, we also have...

    Started by bryangoodrich‎, 12-07-2012 01:26 AM
    • Replies: 0
    • Views: 1,525
    12-07-2012, 01:26 AM Go to last post
  50. Making graph of formula

    My question is the following: I have the following formula Y=ax^2+ bx; I have the a and b value for 20 subjects in 3 conditions. I want to make...

    Started by inge1804‎, 12-06-2012 04:04 AM
    • Replies: 1
    • Views: 1,236
    12-06-2012, 10:51 AM Go to last post
  51. T-test or one-way ANOVA? Please help!

    My research study proposal title is: "Acute effects of aerobic exercise compared with standard medicinal treatments on the dysregulation of the HPA...

    Started by kaj33‎, 12-05-2012 09:30 PM
    anova, dependent variables, independent variables, research, t test
    • Replies: 1
    • Views: 1,916
    12-06-2012, 01:33 AM Go to last post
  52. Identifying the better "performers" in groups of uneven population

    Hello. If the answer to this question is out there, the internet has hidden it pretty well... I've got 5 groups, each with a different...

    Started by AlexP‎, 12-04-2012 11:00 AM
    • Replies: 1
    • Views: 889
    12-04-2012, 04:29 PM Go to last post
  53. Smile How to outperform a data set after doing Wilcoxon Sign-rank test??

    help!!!! I am doing a research in nonparametric statistics. I have 2 set of pair-wise data (A & B). I want to show that A outperform than B. I...

    Started by kelvin0602‎, 12-04-2012 11:39 AM
    • Replies: 0
    • Views: 1,103
    12-04-2012, 11:39 AM Go to last post
  54. Negative Pearson r ? Absolute value?

    Help! I'm computing a Pearson Product-Moment Correlation and I get a negative r-value of -0.75. When I test for significance using a t-test, my...

    Started by Jennifer Nyman‎, 12-01-2012 06:48 PM
    • Replies: 7
    • Views: 2,604
    12-01-2012, 07:46 PM Go to last post
  55. too large p-value

    Hi, I have a problem of interpretation of some results. The problem is the following: I have a model with 4 parameters I have N=55 data...

    Started by Arkonis‎, 11-29-2012 06:18 PM
    • Replies: 1
    • Views: 2,544
    12-01-2012, 07:57 AM Go to last post
  56. Gamma Poisson Mixture with finite Gamma

    Dear all I am working with a Gamma-Poisson mixture distribution where (and this is not usual) the support of the Gamma distribution (in fact, I am...

    Started by ARDE‎, 11-30-2012 06:49 AM
    gamma, mixture, poisson
    • Replies: 0
    • Views: 1,663
    11-30-2012, 06:49 AM Go to last post
  57. Trouble with Wilcoxon signed rank test - please help

    Firstly...I'm an absolute stats novice. I am assessing the urinary toxicity of a procedure by comparing baseline and 6 week International Prostate...

    Started by SusanKW‎, 11-29-2012 07:39 PM
    non-parametric tests, statistical analysis, wilcoxon signed-rank test
    • Replies: 0
    • Views: 905
    11-29-2012, 07:39 PM Go to last post
  58. Gibbs Point Process

    Does anyone knows what is the aim of using Gibbs marked point process?! I read a paper that used this method to find the best configuration of...

    Started by Faranakf‎, 11-29-2012 05:41 PM
    • Replies: 0
    • Views: 1,017
    11-29-2012, 05:41 PM Go to last post
  59. Please help, what analysis to choose?

    Hi, We are doing a customer satisfaction analysis of our school canteen. We have made a factor analysis and made the factor scores. Now we...

    Started by lassekk‎, 11-29-2012 03:06 PM
    • Replies: 3
    • Views: 1,397
    11-29-2012, 03:39 PM Go to last post
  60. How to test a hypothesis comparing two sets of likert item data

    Hi, I want to test a hypothesis but my two variables use likert item data and I don't know if they can be tested together. For example, Q1....

    Started by Sinead‎, 11-08-2012 02:15 AM
    • Replies: 6
    • Views: 2,839
    11-29-2012, 03:38 AM Go to last post

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