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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: 19,403
    10-11-2014, 12:02 PM Go to last post
  1. Factorial experiment in CRD with unequal replications

    Hi guys, i am a graduate student in statistics. i want to test for the main and interaction effect of 3 treatments on a group of patients. let say...

    Started by skyakash‎, 03-17-2016 12:03 PM
    anova, crd, design of experiments, factorial analysis, unequal replications
    • Replies: 3
    • Views: 1,653
    03-18-2016, 06:59 AM Go to last post
  2. Problem with the reliability analysis and factor analysis.

    Hi, As I am working on the statistical research for my graduation, I encountered two problems; 1) I am measuring two multi-dimensional...

    Started by K.Groen‎, 03-17-2016 08:45 AM
    cronbach's alpha, factoranalysis, reliability analysis
    • Replies: 0
    • Views: 1,087
    03-17-2016, 08:45 AM Go to last post
  3. Anova or t-test on squared errors

    I have two forecasting models, moving average and single exponential smoothing. The values of Mean Absolute Percentage Error (MAPE) is 5.2%, 5.8%....

    Started by Mukund‎, 03-16-2016 05:13 AM
    anova, t-test
    • Replies: 0
    • Views: 1,489
    03-16-2016, 05:13 AM Go to last post
  4. Reliability in observational research

    Hi, everybody I am currently writing my master's degree. In relation to this I have come across a problem regarding reliability in two of my...

    Started by Karl90‎, 03-15-2016 02:24 PM
    • Replies: 0
    • Views: 1,910
    03-15-2016, 02:24 PM Go to last post
  5. Models comparison

    I have a time series data of 1000 points for each of the different machines. I tried different forecasting techniques to make a one step prediction....

    Started by Mukund‎, 03-14-2016 12:40 PM
    models comparison
    • Replies: 5
    • Views: 2,017
    03-15-2016, 06:44 AM Go to last post
  6. Nonparametric for paired, but unequal sample size

    Hi, I'm in the midst of writing my master thesis, but I'm having issues with the statistics. I've measured muscle cells. In short, I've 4...

    Started by Conxile‎, 03-14-2016 04:47 AM
    • Replies: 4
    • Views: 1,414
    03-14-2016, 10:29 AM Go to last post
  7. Probability distribution function

    Can somebody explain what is probability distribution function and probability density function in layman terms?? Thanks

    Started by vikash_124124‎, 03-12-2016 03:51 PM
    • Replies: 0
    • Views: 1,583
    03-12-2016, 03:51 PM Go to last post
  8. estimate a range of measures

    Hello everyone, I am a statistics student, I'm studying for a project in my University. I have to analyze the data, I have available the measures in...

    Started by andrew_fg‎, 03-12-2016 05:41 AM
    biostatistics, estimate, measurement
    • Replies: 0
    • Views: 1,081
    03-12-2016, 05:41 AM Go to last post
  9. Kendall's tau-c testing significance

    Hi! I'm very new with statistical research and I need a simple explanation how to test is my correlation what I have with my Kendall's tau-c test...

    Started by Ultimate‎, 03-11-2016 01:39 PM
    • Replies: 0
    • Views: 1,639
    03-11-2016, 01:39 PM Go to last post
  10. Power and sample size calculation for neuroscience

    Dear TalkStats, I have searched the forum but cannot find the answer I am looking for, if you could help that would be great! I am recording...

    Started by lb5962‎, 03-09-2016 04:45 AM
    power alpha sample size, research design, research methods, sample size
    • Replies: 0
    • Views: 1,689
    03-09-2016, 04:45 AM Go to last post
  11. Wilcoxon sign rank test and sample size

    In the Wilcoxon signed rank test, it uses the binomial distribution to calculate p-value for n<20. What would it use if greater/equal to 20?

    Started by hlsmith‎, 03-07-2016 01:50 PM
    • Replies: 2
    • Views: 2,232
    03-07-2016, 04:21 PM Go to last post
  12. Question Confidence intervals and effect size for non-parametric tests help

    Hi I am currently carrying out data analysis on SPSS for pre post treatment measures using non-parametric tests, the Wilcoxon signed rank test...

    Started by sineaddw‎, 03-05-2016 10:34 AM
    • Replies: 1
    • Views: 1,506
    03-05-2016, 10:13 PM Go to last post
  13. 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: 1,949
    03-03-2016, 10:30 PM Go to last post
  14. test of normality help

    Dear Friends i need help in statistical research paper kindly assist some help thank you.

    Started by malko‎, 03-01-2016 11:12 AM
    • Replies: 4
    • Views: 1,484
    03-03-2016, 08:02 PM Go to last post
  15. False Coverage Rate - adjusting confidence intervals for multiple comparisons

    Hello, I could do with some help regarding correcting confidence intervals for multiple comparisons. I have carried out a number of multiple...

    Started by Pepper_Plant‎, 03-02-2016 02:38 PM
    confidence intervals, multiple comparisons
    • Replies: 2
    • Views: 1,296
    03-03-2016, 09:09 AM Go to last post
  16. Interpretation of an AR model

    hi, looking at process times of a rather complex machine I found that an AR(2) model describes it quite well. Does it make sense to interpret this...

    Started by rogojel‎, 03-02-2016 02:56 AM
    ar model, interpretation, time series
    • Replies: 2
    • Views: 1,086
    03-02-2016, 11:50 AM Go to last post
  17. Which test to use for these variables and their associations

    Hey, I have some questions about which test I can or have to use. Which test do I use to only identify if there is a relationship between those...

    Started by MasterStudent‎, 03-01-2016 08:29 AM
    anova, association, chi square, kruskal-wallis anova
    • Replies: 0
    • Views: 851
    03-01-2016, 08:29 AM Go to last post
  18. Anova

    I am trying to find the effects of feed rate, cutting speed and depth of cut on surface roughness. I have five sets of feed rate ( 0.09, 0.10, 0.125,...

    Started by saad2733‎, 02-28-2016 01:42 PM
    anova, minitab
    • Replies: 5
    • Views: 2,760
    02-29-2016, 06:07 AM Go to last post
  19. Lightbulb Data Analysis visualization

    Hi Everyone, Lately I have been searching a data analyzer tool/software, which would also present my data in a better way. I came across DataPlay...

    Started by john-rose‎, 02-26-2016 03:07 AM
    analyze, data, presentation, research, visual
    • Replies: 0
    • Views: 1,104
    02-26-2016, 03:07 AM Go to last post
  20. Question [SOLVED] Option for post-hoc test after permanova for community data?

    Hi there, Thank you for reading my post and hopefully someone can provide me with some help! For my master's thesis, I have used microbial...

    Started by Bob3‎, 02-15-2016 07:21 AM
    community, permanova, post-hoc
    • Replies: 3
    • Views: 4,260
    02-24-2016, 08:58 PM Go to last post
  21. Rasch Analysis

    Hello all, someone asked me to look into Rasch Analysis. I have found a few articles that I am going to read but I was just curious if anybody is...

    Started by lancearmstrong1313‎, 11-20-2012 07:05 AM
    • Replies: 4
    • Views: 3,762
    02-23-2016, 12:09 PM Go to last post
  22. Which Statistical test to use?

    Can someone tell me the statistical tests I could use with the following variables. Independent variable categorical (high, medium, low)...

    Started by Student3400‎, 02-22-2016 08:15 PM
    categorical variable, dependent, dependent variable, independent, variables
    • Replies: 1
    • Views: 1,326
    02-23-2016, 02:54 AM Go to last post
  23. Reliability and Validity

    Hi every body am conducting an educational research, and I've been asked to use statistics in my research!! I used a test in a pre and post...

    Started by rukia‎, 02-20-2016 02:43 PM
    • Replies: 3
    • Views: 2,047
    02-21-2016, 01:42 PM Go to last post
  24. binary forcasting

    Hello My data in a binary form a one-hour period for 90 days. 0=Not happened 1= happended I wanna to forcasting these data ,and i dont know what...

    Started by aminabdolahnejad‎, 02-16-2016 01:52 PM
    • Replies: 3
    • Views: 1,555
    02-20-2016, 03:08 PM Go to last post
  25. Significance test for 13 dichotomous DVs?

    I am studying unprofessional conduct. I have every case of misconduct over a 5-year period. I am curious if misconduct varies by education level. ...

    Started by ddb01‎, 02-18-2016 12:34 PM
    binary dependent variable, chi sq, cochran's q test, non parametric, significance test
    • Replies: 0
    • Views: 1,342
    02-18-2016, 12:34 PM Go to last post
  26. Cool Definition of deflated

    Hello guys Do you know what do they mean by "deflated" in the following sentence? "firms reported goodwill impairment loss ( expressed as...

    Started by Lisa92‎, 02-13-2016 04:58 PM
    • Replies: 3
    • Views: 2,185
    02-13-2016, 08:13 PM Go to last post
  27. Cool question about change in period

    Hello guys:) I wonder whether you can help me. I do not know which analysis i can use. My aim is to prove or not the following hypothesis: ...

    Started by Lisa92‎, 02-12-2016 07:10 PM
    research, statisitcs
    • Replies: 0
    • Views: 903
    02-12-2016, 07:10 PM Go to last post
  28. Structural Model & Fit Indices

    I am new to the statistical area. I have a test that uses a Structural Model that is used to test the causal hypothesis between independent variables...

    Started by newstats09‎, 02-11-2016 12:56 AM
    • Replies: 0
    • Views: 1,009
    02-11-2016, 12:56 AM Go to last post
  29. SPSS-Uneven Sample Size and choice of analysis for two fixed factors with 4 variables

    Hi All, I have a dilemma that I have been trying to find the answers myself but cant seem to find anything to solve my problem. I have...

    Started by playdium‎, 02-10-2016 02:19 AM
    biology, scientific analysis, spss, uneven samples
    • Replies: 0
    • Views: 1,078
    02-10-2016, 02:19 AM Go to last post
  30. Questions on data complexity beyond my stats knowledge: what stats tests to use?

    Hi everyone, sorry for this long post. I tried to be detailed, but if anything is unclear, please let me know. I consulted two stats friends for help...

    Started by Rosslady‎, 02-09-2016 11:02 PM
    • Replies: 0
    • Views: 1,078
    02-09-2016, 11:02 PM Go to last post
  31. 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 02:34 AM
    mcmc, metropolis-hastings
    • Replies: 2
    • Views: 3,540
    02-08-2016, 11:05 PM Go to last post
  32. 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: 1,211
    02-06-2016, 02:36 PM Go to last post
  33. 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: 1,286
    02-04-2016, 03:11 PM Go to last post
  34. 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: 1,659
    02-03-2016, 04:12 PM Go to last post
  35. 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: 894
    02-01-2016, 09:05 PM Go to last post
  36. Hypothesis testing

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

    Started by Monjurul‎, 02-01-2016 06:58 AM
    • Replies: 1
    • Views: 1,341
    02-01-2016, 09:53 AM Go to last post
  37. 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: 1,088
    01-31-2016, 07:42 AM Go to last post
  38. 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: 1,573
    01-31-2016, 03:09 AM Go to last post
  39. 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: 1,198
    01-30-2016, 11:30 AM Go to last post
  40. 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: 1,376
    01-25-2016, 08:55 AM Go to last post
  41. 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: 1,025
    01-24-2016, 10:34 PM Go to last post
  42. 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: 1,196
    01-21-2016, 04:36 AM Go to last post
  43. 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: 1,453
    01-20-2016, 06:31 PM Go to last post
  44. 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: 5,598
    01-16-2016, 05:47 PM Go to last post
  45. 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: 1,475
    01-16-2016, 02:47 PM Go to last post
  46. 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: 655
    01-14-2016, 01:49 PM Go to last post
  47. 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: 1,072
    01-14-2016, 10:38 AM Go to last post
  48. 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: 1,249
    01-12-2016, 01:52 PM Go to last post
  49. 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: 1,145
    01-08-2016, 03:57 AM Go to last post
  50. 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: 1,932
    01-07-2016, 12:07 PM Go to last post
  51. 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: 1,548
    01-04-2016, 05:43 PM Go to last post
  52. 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: 2,392
    01-03-2016, 12:15 PM Go to last post
  53. 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: 2,153
    01-02-2016, 09:22 AM Go to last post
  54. 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: 2,686
    01-01-2016, 01:36 PM Go to last post
  55. 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: 1,735
    01-01-2016, 12:39 PM Go to last post
  56. 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: 1,151
    12-31-2015, 11:26 AM Go to last post
  57. 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: 1,478
    12-30-2015, 11:51 AM Go to last post
  58. 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: 1,230
    12-29-2015, 11:15 AM Go to last post
  59. 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: 1,261
    12-29-2015, 06:40 AM Go to last post
  60. 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: 2,321
    12-29-2015, 05:16 AM Go to last post

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