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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: 4,977
    10-11-2014, 01:02 PM Go to last post
  1. Confused: Metropolis-Hastings, its variations and the Hastings correction ratio

    Hello everyone, Over the past few weeks I have been studying MCMC and Metropolis-Hastings algorithms. Unfortunately I am stuck and confused with...

    Started by Bekos‎, 07-19-2013 03:34 AM
    mcmc, metropolis-hastings
    • Replies: 2
    • Views: 1,118
    Yesterday, 11:05 PM Go to last post
  2. Stats for emergency care delivery

    Hi all- I am hoping you can help me. I'm trying to write a paper on a new model in my ED, which reduced wait times/LOS, and improved other things...

    Started by neuroticnovice‎, 02-05-2016 10:21 AM
    • Replies: 2
    • Views: 189
    02-06-2016, 02:36 PM Go to last post
  3. Smile Question concerning an "unusual" research design

    Hey everyone, I have a question concerning a between group research-design and I wonder if it is very wise since I never came across a similar...

    Started by mike_88‎, 02-04-2016 03:11 PM
    dependent variables, design
    • Replies: 0
    • Views: 126
    02-04-2016, 03:11 PM Go to last post
  4. Splitting obs. based on DV class for separate random forest runs

    I am working with a relatively large (n=162,000) data set on a land use classification problem using random forest. I have four land use classes...

    Started by jajeuck‎, 02-03-2016 03:25 PM
    ensemble, random forest
    • Replies: 1
    • Views: 148
    02-03-2016, 04:12 PM Go to last post
  5. Leave-one-out cross validation

    Hi, I am trying to understand the Leave-one-out cross validation method but all sources explain it mathematically. Can someone please basically...

    Started by jsmith613‎, 02-01-2016 02:35 PM
    • Replies: 4
    • Views: 212
    02-01-2016, 09:05 PM Go to last post
  6. Hypothesis testing

    There is no statistically signifincant difference ........how to interpret this!

    Started by Monjurul‎, 02-01-2016 06:58 AM
    • Replies: 1
    • Views: 108
    02-01-2016, 09:53 AM Go to last post
  7. Recognition of multiple spacial patterns

    Hello! I am looking for some nifty techniques or methods to help me gather elements of a set which are compatible with a base pattern. The set...

    Started by DrGob‎, 01-31-2016 07:42 AM
    • Replies: 0
    • Views: 122
    01-31-2016, 07:42 AM Go to last post
  8. How to calculate sample size and effect size for comparing means from two groups

    Hi all, hoping i can find some answers here for a bit of a problem i am having regarding a sample size calculation for a study I am soon to conduct. ...

    Started by Damo123‎, 01-25-2016 08:14 PM
    comparing means, effect size, sample size calculation
    • Replies: 3
    • Views: 308
    01-31-2016, 03:09 AM Go to last post
  9. Unhappy Question about type of research

    Hello guys!:) I wonder whether anyone of you who is killing in statistics could give an advice. I am writing my master thesis at the moment. The...

    Started by Lisa92‎, 01-30-2016 11:30 AM
    research, research design, significance testing, significant, statisics
    • Replies: 0
    • Views: 136
    01-30-2016, 11:30 AM Go to last post
  10. General inverse variance method

    Hi I hope I've posted this in the right place. I'm converting standardised mean differences to log OR for a meta-analysis. Just wanting to know...

    Started by glassman365‎, 01-25-2016 07:14 AM
    meta analysis, odds ratio, standard error
    • Replies: 1
    • Views: 221
    01-25-2016, 08:55 AM Go to last post
  11. How do i analyze the following results statistically?

    In an animal experiment study, efficacy/preference of an energy drink was compared against the individual compounds present in it. 3 groups were...

    Started by mrgb‎, 01-24-2016 10:34 PM
    statistical analysis, statistical research
    • Replies: 0
    • Views: 137
    01-24-2016, 10:34 PM Go to last post
  12. How can I best analyze this data

    I have some data I am trying to analyze but was hoping to get some stats help with it. I'm not sure what the best way to analyze it is. I'm...

    Started by YellowM3‎, 01-24-2016 07:19 PM
    • Replies: 0
    • Views: 104
    01-24-2016, 07:19 PM Go to last post
  13. How should I run an interaction test to find out the main effect of ad type?

    Hello everyone, I designed an experiment. There are two types of advertisement, type 1 and type 2. 50% of my participants looked at the type 1 and...

    Started by yue86231‎, 01-20-2016 11:05 AM
    • Replies: 1
    • Views: 237
    01-21-2016, 04:36 AM Go to last post
  14. Smile Fisher's Exact test and subjects with multiple observations?

    Hi Everyone, I was wondering if I could please have some advice on how to deal with data that have multiple observations for some of the subjects...

    Started by NenaB‎, 01-19-2016 02:45 PM
    difference in proportions, fisher's exact, proportions, related observations
    • Replies: 4
    • Views: 265
    01-20-2016, 06:31 PM Go to last post
  15. Is it meaningful to calculate a p-value based on a convenience sample?

    Ignore the bootstrap as a possibility. If the answer is no, then what is the point of stating the p-value (especially if it is, say, 0.10)?

    Started by woodbomb‎, 01-12-2016 09:18 AM
    2 Pages
    1 2
    convenience, p-value, significance
    • Replies: 20
    • Views: 935
    01-16-2016, 05:47 PM Go to last post
  16. probability formula

    Hello, I would like to know the formula that would allow me to do the following; Assume; 1. 200 total events occur in 100 days (ie; 2 events per...

    Started by FrankStats‎, 01-15-2016 03:11 PM
    formula, probaility
    • Replies: 5
    • Views: 220
    01-16-2016, 02:47 PM Go to last post
  17. Lightbulb Using standard deviation on two mean values of two different instruments

    Hi all, I'm making a research and doing a final data analysis. The research was undertaken using a questionnaire and then structured interviews....

    Started by oraclepilot‎, 01-14-2016 01:49 PM
    • Replies: 0
    • Views: 171
    01-14-2016, 01:49 PM Go to last post
  18. What tests should I use when my moderator is discrete?

    Hello everybody, I am currently in the final phase of my master thesis. I have collected my data and I am trying to do my statistical tests, but I...

    Started by willemvw‎, 01-14-2016 10:38 AM
    • Replies: 0
    • Views: 103
    01-14-2016, 10:38 AM Go to last post
  19. Multi Modal Example trying to assess correct Statiscal approach

    I am trying to figure out the best statistical approach to address a problem. I am looking at 100 retail stores and looking at their hourly traffic....

    Started by AlexC200‎, 01-12-2016 01:10 PM
    multi-variable, statiscal approach
    • Replies: 1
    • Views: 183
    01-12-2016, 01:52 PM Go to last post
  20. Should I use Bonferroni (or other similar corrections)?

    Hello! I am new in this forum, I have a question and I hope you could help me! :p Suppose that I have to measure 10 independent variables on 60...

    Started by Fischer‎, 01-08-2016 03:57 AM
    • Replies: 0
    • Views: 234
    01-08-2016, 03:57 AM Go to last post
  21. Statistical Design of Experiments: Impact of missing and/or changing experiments

    Hello, I am new to both this forum and the concept of statistical design so please, treat me like the novice I am! OK, so I am hoping to carry...

    Started by creddick‎, 01-07-2016 11:34 AM
    incomplete, reliability, significance, statistical design
    • Replies: 1
    • Views: 242
    01-07-2016, 12:07 PM Go to last post
  22. Variance across different sample sizes

    Hello, I want to know how I can interpret variance when the sample sizes are not exact. Here is my problem: I am analyzing daily playing data...

    Started by theyjamin‎, 12-29-2015 05:39 PM
    • Replies: 4
    • Views: 431
    01-04-2016, 05:43 PM Go to last post
  23. Factor analysis

    Dear members, I have 20 questions (Likert 5-point), ultimately I want one variable: "affect". So I ran a factoranalysis, which gives me 4...

    Started by SPSSBurnd‎, 01-03-2016 09:08 AM
    factor analysis, output, spss, thesis
    • Replies: 1
    • Views: 599
    01-03-2016, 12:15 PM Go to last post
  24. Independent T-test or ANCOVA?

    Hi everyone; Hope you're doing well!! I'm conducting a PhD dissertatind in educational research, I made a test to compare some students performance...

    Started by rukia‎, 12-25-2015 11:04 AM
    • Replies: 10
    • Views: 622
    01-02-2016, 09:22 AM Go to last post
  25. Assumptions for mix design anova with covariates

    Hello I Would like to nake a mix design (I HAVE TWO GROUPS -SICK AND HEALTHY), AND I made a cognitive measure of long / short exposure stimulus. ...

    Started by talgef‎, 12-26-2015 07:03 AM
    • Replies: 11
    • Views: 562
    01-01-2016, 01:36 PM Go to last post
  26. Help with multidimensional scaling for multiple DVs

    Hello statistics experts! I couldn't find an answer to my question so I thought that one of you might know: I have 14 risk sources, like nuclear...

    Started by Gabriel N.‎, 01-01-2016 12:26 PM
    clustering, multidimensional scaling, multivariate analysis, vector
    • Replies: 1
    • Views: 197
    01-01-2016, 12:39 PM Go to last post
  27. Best Methodology for Solving for a Dummy Variable

    Hi everyone. This is my first post on the forum and unfortunately is an act of frustration after reading many articles and textbook sections without...

    Started by tuneman1980‎, 12-31-2015 10:44 AM
    • Replies: 1
    • Views: 259
    12-31-2015, 11:26 AM Go to last post
  28. which reference category for factor variables

    Hello, I was wondering if there is any systematic rational of how to decide which category of a factor variable (e.g. level of education -primary,...

    Started by andik‎, 12-29-2015 09:35 PM
    • Replies: 3
    • Views: 241
    12-30-2015, 11:51 AM Go to last post
  29. What is the purpose of inferential statistical tests when you already have parameters

    Hello, I'm an undergraduate political science student, and I am working on my senior thesis. I've collected data on a small population (N = 129)....

    Started by cjc110244‎, 12-28-2015 05:55 PM
    • Replies: 2
    • Views: 283
    12-29-2015, 11:15 AM Go to last post
  30. Should I be using a MANOVA?

    Hi all, I apologise in advance if I explain this poorly - this is all somewhat new to me. I'm currently doing a small piece of classroom research...

    Started by dbang‎, 12-28-2015 01:40 AM
    • Replies: 7
    • Views: 275
    12-29-2015, 06:40 AM Go to last post
  31. normal distribution

    Hello I have two separate population (sick/ not sick), that I wanted to check if a specific variable (cognitive variable- general mind wandering...

    Started by talgef‎, 12-22-2015 05:07 AM
    • Replies: 4
    • Views: 375
    12-29-2015, 05:16 AM Go to last post
  32. Angry Simple or Factorial Experiment Could I Chose?

    Dear, friends, scientests, and researchers I conducted an experiment to study two factors, first was irrigation method (I) which consisted 2...

    Started by hazemalashwal‎, 12-28-2015 08:55 AM
    • Replies: 1
    • Views: 158
    12-28-2015, 09:00 AM Go to last post
  33. what does rejecting the hypothesis mean

    Hi, so I'm new to statistics and am not very comfortable with it yet. It may be a very simple question, but I'm finding this very difficult to...

    Started by madhu‎, 12-28-2015 06:34 AM
    hypotheses, hypotheses testing, hypothesis
    • Replies: 0
    • Views: 27
    12-28-2015, 06:34 AM Go to last post
  34. Question Bayesian parameter estimation via MCMC?

    Hi folks. I have the following question. I have a model M containing 20 adjustable parameters k = {k_j}. I also have 40-50 measured...

    Started by witziger_Fuchs‎, 12-15-2015 08:49 AM
    • Replies: 2
    • Views: 307
    12-26-2015, 02:34 AM Go to last post
  35. Which Tests to applicate for Trends?

    Hi everyone, it's christmas time again, which for me means, some free time :) During my free time I looked to acquire a bit more knowledge in some...

    Started by horror‎, 12-23-2015 08:42 AM
    • Replies: 2
    • Views: 352
    12-23-2015, 12:49 PM Go to last post
  36. paired samples

    Hello! I have two separate group. On each group, I could have done paired samples t-test, but I want to compare between the two of them- is there...

    Started by talgef‎, 12-21-2015 06:56 AM
    • Replies: 5
    • Views: 415
    12-21-2015, 01:06 PM Go to last post
  37. Enrichment / over-representation of pairs, triplets, quadruples, etc.

    Due to a lack of interest from users for over a month I would like to delete this thread.

    Started by Adam Przedniczek‎, 12-19-2015 04:01 PM
    enrichment, over-representation
    • Replies: 0
    • Views: 376
    12-19-2015, 04:01 PM Go to last post
  38. How to compare whether younger patients have better therapeutic results ?

    Hi, I've just finished a research on 30 patients. Age range was 26 to 80. I've tested everyone of them before and after the treatment. Results are...

    Started by nicck‎, 12-19-2015 09:16 AM
    • Replies: 1
    • Views: 266
    12-19-2015, 10:07 AM Go to last post
  39. Which Test for Comparing a Group Pre and Post

    A group of people have participated in a program That group of people have completed a questionnaire pre and post program Because it is a...

    Started by Joelymac‎, 11-08-2015 12:35 PM
    • Replies: 3
    • Views: 435
    12-18-2015, 07:30 PM Go to last post
  40. Multiple testing?

    Hi all, I have a question about some analyses that I did. I examined a large hospital admissions data set and the data were grouped by areas 1, 2,...

    Started by wernie07‎, 12-17-2015 03:07 PM
    • Replies: 7
    • Views: 352
    12-18-2015, 10:54 AM Go to last post
  41. Exclamation Sample Size Selection

    Hi All I am having trouble with a sample size selection. I would like to run a study on the following applications to a program and record how many...

    Started by Bird1990‎, 12-12-2015 12:33 PM
    • Replies: 3
    • Views: 417
    12-12-2015, 09:28 PM Go to last post
  42. APA report format

    I have performed the Welch ANOVA due to the violation of homogeneity of variance. The df shown in spss is (2,164,078) Should I report this value,...

    Started by Nivv‎, 12-12-2015 08:21 AM
    • Replies: 0
    • Views: 303
    12-12-2015, 08:21 AM Go to last post
  43. [SAS] Compare predicted vs actual continuous [0,1] data

    Hello, I have predicted values for year and quarter that were calculated from a linear regression, and I also have actual values. I would like to...

    Started by kdk‎, 12-08-2015 05:13 PM
    actual values, comparison, predicted values, regression
    • Replies: 1
    • Views: 418
    12-08-2015, 08:01 PM Go to last post
  44. Violating the assumption of normality and homogeneity of variances. How to report?

    I am trying to run One way ANOVA but after trying to test these two assumptions, I found that the data violated the assumptions. I am now trying...

    Started by Nivv‎, 12-06-2015 06:43 AM
    • Replies: 2
    • Views: 327
    12-06-2015, 08:41 AM Go to last post
  45. structural zeros and chi square

    Hello, I have been reading a little bit about structural zeros and chi-square goodness of fit tests. I've not been able to find a clear answer...

    Started by wdmn‎, 12-05-2015 02:08 PM
    • Replies: 2
    • Views: 306
    12-05-2015, 03:48 PM Go to last post
  46. comparing models

    This might be a "101" question but hey, The Ecologist" encouraged me to ask questions , lots and lots of stupid questions. So when I have two...

    Started by bugman‎, 08-21-2015 01:14 AM
    • Replies: 7
    • Views: 761
    12-04-2015, 10:26 PM Go to last post
  47. How should I further analyse this result?

    I have following variables: -"adtype" (1 is print ad with testimonials, 2 is print ad without testimonials.) -"AT1" which is "ad attitude...

    Started by yue86231‎, 11-24-2015 09:45 AM
    • Replies: 4
    • Views: 469
    12-04-2015, 04:05 AM Go to last post
  48. Need help determining proper test, im confused

    Describe relationship between mother and father's education. I recoded each into three levels. I think it is spearman rho, but second part of...

    Started by Jay Kenyon‎, 11-08-2015 02:57 AM
    • Replies: 2
    • Views: 417
    12-04-2015, 04:00 AM Go to last post
  49. disregard post, need 5 posts to pm someone

    Random stuff to get 5 posts

    Started by Jay Kenyon‎, 12-04-2015 02:22 AM
    • Replies: 2
    • Views: 274
    12-04-2015, 02:23 AM Go to last post
  50. correlation matrix: Bonferroni or not Bonferroni is my question

    Hello all, When constructing correlation matrices, a number of people claim that one should apply the Bonferroni adjustment if the number of...

    Started by andik‎, 12-02-2015 07:47 PM
    • Replies: 4
    • Views: 378
    12-03-2015, 08:50 PM Go to last post
  51. How to fix mistake of changing psychometric seven point scale to a five point scale?

    :shakeheadHi my first research project uses 3 psychometric scales which have all been peered reviewed as valid & reliable. I mistakenly thought it...

    Started by longpaddock‎, 07-15-2015 05:42 AM
    • Replies: 2
    • Views: 527
    12-03-2015, 11:35 AM Go to last post
  52. Trying to find MS Excel Wilcoxon Rank Sum test example

    I am a pharmacy student doing a 4th year (final year) Capstone Research Project. I am attempting to run my data utilizing a Wilcoxon Rank Sum Test...

    Started by alkamas‎, 11-29-2015 05:32 PM
    help please, wilcoxon rank sum test
    • Replies: 1
    • Views: 383
    12-01-2015, 08:55 PM Go to last post
  53. Analyzing data - what tools should I use?

    Hello, I am analyzing data of seat distribution among different types of rail wagons. I have m types of wagons and n seats. What I want to achieve...

    Started by pockoc‎, 12-01-2015 03:13 AM
    • Replies: 1
    • Views: 399
    12-01-2015, 08:47 AM Go to last post
  54. [wilcoxon/paired t test] when to exclude data? Not normally distributed data.

    Hello! I ran an analysis of my data of research into a repeated measures design and found the difference of both conditions to be not normally...

    Started by LoudWhisper‎, 11-28-2015 05:01 AM
    • Replies: 1
    • Views: 303
    11-28-2015, 08:10 AM Go to last post
  55. Costant coefficient in logit model

    Hello, I would like to make sure of my argument. Am I right when I say that a constant coefficient in logit model MUST BE close to zero ?? ...

    Started by russel2000‎, 11-21-2015 09:33 AM
    • Replies: 8
    • Views: 496
    11-23-2015, 11:51 AM Go to last post
  56. Question Identifying relevant predictors and interactions

    I have a data set comprising of 12,000 observations and 1,100 potential predictors (continuous and nominal) for a binary outcome/target variable. ...

    Started by Edwin_C‎, 11-23-2015 05:57 AM
    feature selection, statistical analysis, statistical research
    • Replies: 0
    • Views: 209
    11-23-2015, 05:57 AM Go to last post
  57. Help understanding results of this radomized controlled trial.

    In the following published paper linked to below, could someone explain the meaning of this quote: Link to publication that the quote is from:...

    Started by 7055‎, 11-21-2015 05:44 PM
    • Replies: 2
    • Views: 317
    11-22-2015, 10:20 AM Go to last post
  58. Post One response variable and multiple explanatory variables (numeric and factor values)

    Hello everyone, I am a master student in Biology. I am now trying to analyse my thesis data, but I am facing a problem: I do not understand which...

    Started by Cass123‎, 11-15-2015 11:48 AM
    • Replies: 7
    • Views: 453
    11-21-2015, 01:30 PM Go to last post
  59. binary choice with fisheries data over time

    Hi all, I am new to the forum so please bear with me if I am not following protocol in my post. I have fisheries data which is vessel specific....

    Started by senegale‎, 11-17-2015 03:31 PM
    • Replies: 4
    • Views: 374
    11-19-2015, 02:19 PM Go to last post
  60. Testing Model Fit between Subsets of Data When Using Multilevel Models

    When using multilevel models based on maximum likelihoods, one can use either deviance statistics (e.g., -2LLs) for nested models or information...

    Started by 3.14159‎, 11-18-2015 03:49 PM
    maximum likehood, model fit, mulitilevel model
    • Replies: 0
    • Views: 268
    11-18-2015, 03:49 PM Go to last post

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