1. 10-14-2010
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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 03:56 AM
    • Replies: 14
    • Views: 5,631
    10-11-2014, 12:02 PM Go to last post
  1. Average height of population

    I am trying to figure out how many samples to take from known population to be accurate within 95%. For example to find average height and...

    Started by mike121‎, Yesterday 08:56 PM
    • Replies: 0
    • Views: 77
    Yesterday, 08:56 PM Go to last post
  2. chi square test to test difference for 5x2

    My data has two groups people, VV and NV, and I want to test the difference in their occupation. The occupation were 5 groups: farm/fh, farmer/fh,...

    Started by fengyuwuzu‎, 04-27-2016 07:04 PM
    • Replies: 1
    • Views: 123
    04-27-2016, 07:47 PM Go to last post
  3. Need help for an analysis

    Hi I'm working in a textile company that have stores in many countries.While planning quantities of product,we are considering of product display...

    Started by munire‎, 04-27-2016 02:26 PM
    • Replies: 0
    • Views: 76
    04-27-2016, 02:26 PM Go to last post
  4. Post Need help for my data analysis

    Hi, I need help in analysing the data that I have collected for my final year dissertation. Kindly find the data sheet attached. I need to...

    Started by priyankashree‎, 04-27-2016 04:18 AM
    • Replies: 1
    • Views: 84
    04-27-2016, 04:50 AM Go to last post
  5. Staff performance comparison between staff and overall metric

    "Age Group" "Members in 2015" "Complaints in (2015)" "Staff 1 Members in 2016" "Staff 1 Complaints in 2016" "Staff 2 Members in 2016" "Staff 2...

    Started by venky80‎, 04-22-2016 11:25 AM
    • Replies: 0
    • Views: 207
    04-22-2016, 11:25 AM Go to last post
  6. Standard deviation

    I have a population of 229, the mean is 20.8 and the standard deviation is 24.6. What can be concluded from this? Is this significant?

    Started by Damara‎, 04-19-2016 05:21 PM
    • Replies: 0
    • Views: 219
    04-19-2016, 05:21 PM Go to last post
  7. How to apply Chi Squared test according to this Simulation?

    Hi there, I have been wondering about some points of Chi squared test. I would like to introduce the following scenario to better clarify my...

    Started by pelluzi‎, 04-19-2016 04:24 PM
    anova, chi sq test, chi square test, chi squared
    • Replies: 0
    • Views: 88
    04-19-2016, 04:24 PM Go to last post
  8. Need a methodology to predict car sales from various showrooms in a district

    Data Assumptions: The sales on a particular day is always 60 There are 3 showrooms in the district There are other factors too(I have omitted the...

    Started by simplequestions‎, 04-19-2016 04:44 AM
    • Replies: 0
    • Views: 95
    04-19-2016, 04:44 AM Go to last post
  9. Policy chance analysis - time series count data

    Hi, I need some help to determine my approach. For a school project I would like to examine the effect of a policy change in the Danish...

    Started by flickerbrood‎, 04-18-2016 07:01 AM
    count data, statistical analysis, time series
    • Replies: 0
    • Views: 112
    04-18-2016, 07:01 AM Go to last post
  10. What statistical test should I use to test for statistical significance?

    Hello fellow members, I haven't been using statistics for a long time and I have trouble recalling statistical tests and their use. I hope you can...

    Started by Tanja.M‎, 04-17-2016 10:27 AM
    • Replies: 1
    • Views: 166
    04-18-2016, 01:48 AM Go to last post
  11. How can I analyse this data is the best way possible?

    How can I investigate the theory that a relationship between two variables, X and Y is 'Y in proportion to X^3/4' within a population where I can...

    Started by Amritanar‎, 04-17-2016 04:46 AM
    • Replies: 0
    • Views: 137
    04-17-2016, 04:46 AM Go to last post
  12. Time Series - Difference over time

    Hello, I'm new in the time series, so I need some help. I have a short time series (5 quarters), with the proportion of a parameter (public...

    Started by wisit‎, 03-08-2016 09:52 AM
    difference, proportion, significance, time series
    • Replies: 3
    • Views: 414
    04-15-2016, 02:15 AM Go to last post
  13. 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 06:19 PM
    • Replies: 4
    • Views: 464
    04-13-2016, 04:04 PM Go to last post
  14. Talking Should I use a Weighted Average? HELP!

    Hi All - first post here and advanced warning I'm no stats wiz, but need the kind help of y'all. I have a huge dataset I am working with and trying...

    Started by IllegallyUnanalytical‎, 03-29-2016 08:12 PM
    • Replies: 2
    • Views: 288
    04-13-2016, 03:49 PM Go to last post
  15. What model should I use? Mixed-effect model?

    Hello guys, I really hope you can help me with this. Any ideas/suggestions are welcome. My main goal is to create a model that predicts which...

    Started by Marvin85‎, 03-16-2016 02:22 PM
    • Replies: 13
    • Views: 613
    04-12-2016, 04:58 AM Go to last post
  16. standardize by population density

    I have a variable called "number of events" for each state. It is a raw number of event that happened during a specific time frame. I was thinking I...

    Started by grayskillen‎, 04-11-2016 09:57 AM
    population, rates, standardization
    • Replies: 0
    • Views: 112
    04-11-2016, 09:57 AM Go to last post
  17. Question on the merits of mediation analysis Vs another analysis (described within)

    Hello, I have a dataset involving an intervention (placebo versus real) - denoted as X, an outcome (Y), and a physiological variable (M) that I...

    Started by Siobh‎, 04-05-2016 07:40 AM
    correlation, intervention-analysis, mediation analysis, regression
    • Replies: 0
    • Views: 250
    04-05-2016, 07:40 AM Go to last post
  18. Estimating location of lower tail

    Say I have a sample, assumed from a Normal Distribution. I want to find a confidence interval for this parameter: L = \mu - \alpha * \sigma ...

    Started by EdddieB1985‎, 03-31-2016 12:40 AM
    confidence interval, estimation, standard error
    • Replies: 2
    • Views: 319
    03-31-2016, 11:58 AM Go to last post
  19. Talking Clinical Trial - sample size for statistically comparable data?

    Hi Everyone In a nutshell - I am looking to undertake an 8 week clinical trial of an equine veterinary health product. I am wanting to analyse...

    Started by WildlifeStats‎, 03-29-2016 05:25 AM
    clinical trial, placebo, sample size, sample size calculation, sample size determination
    • Replies: 1
    • Views: 154
    03-29-2016, 08:03 AM Go to last post
  20. Non-Inferiority Test in Multple Logistic Model

    Does any body have any insight or experience running a non-inferiority test based on multiple linear or logistic regression. So perhaps mean and risk...

    Started by hlsmith‎, 03-24-2016 11:59 AM
    • Replies: 1
    • Views: 168
    03-28-2016, 01:22 PM Go to last post
  21. Do i use an ANCOVA for a cross over of exams, pre/post study?

    I have a study i am running and would like to know the appropriate test to apply, its complicated but bear with me :) Background: We are looking...

    Started by Damo123‎, 03-24-2016 12:35 PM
    • Replies: 0
    • Views: 312
    03-24-2016, 12:35 PM Go to last post
  22. Confidence Intervals in a research paper

    Hi, all. I'm writing a paper on concussion data from the NFL Surveillance System, and I want to be able to put the data analysis from the journal...

    Started by leafonthewind‎, 03-23-2016 01:13 PM
    confidence intervals, independent events, p value, research article
    • Replies: 3
    • Views: 237
    03-24-2016, 07:42 AM Go to last post
  23. Variance Inflation Factor

    Hej, I am checking for multicollinearity. And I cant find on the web when having the outpur from R commander, on which I have to look to identify...

    Started by MasterStudent‎, 03-10-2016 07:03 AM
    • Replies: 9
    • Views: 406
    03-23-2016, 12:09 PM Go to last post
  24. Question The null hypothesis

    Hi everybody, I would like to hear from you your suggestions, I would be grateful to your help and thank you in advance for your help. I am a...

    Started by Rachi‎, 03-21-2016 05:50 PM
    • Replies: 2
    • Views: 240
    03-22-2016, 11:40 AM Go to last post
  25. Post Principal component analysis (PCA) on clustered data

    Hi Everyone, I am analysing data about physical condition tests on students belonging to different type of schools (general, professional,...

    Started by AkaKiwi‎, 03-18-2016 10:40 AM
    • Replies: 3
    • Views: 282
    03-21-2016, 03:18 AM Go to last post
  26. 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: 219
    03-18-2016, 06:59 AM Go to last post
  27. 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: 126
    03-17-2016, 08:45 AM Go to last post
  28. 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: 146
    03-16-2016, 05:13 AM Go to last post
  29. 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: 181
    03-15-2016, 02:24 PM Go to last post
  30. 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: 246
    03-15-2016, 06:44 AM Go to last post
  31. 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: 170
    03-14-2016, 10:29 AM Go to last post
  32. 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 02:51 PM
    • Replies: 0
    • Views: 178
    03-12-2016, 02:51 PM Go to last post
  33. 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 04:41 AM
    biostatistics, estimate, measurement
    • Replies: 0
    • Views: 130
    03-12-2016, 04:41 AM Go to last post
  34. 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 12:39 PM
    • Replies: 0
    • Views: 161
    03-11-2016, 12:39 PM Go to last post
  35. 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 03:45 AM
    power alpha sample size, research design, research methods, sample size
    • Replies: 0
    • Views: 217
    03-09-2016, 03:45 AM Go to last post
  36. 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 12:50 PM
    • Replies: 2
    • Views: 268
    03-07-2016, 03:21 PM Go to last post
  37. 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 09:34 AM
    • Replies: 1
    • Views: 267
    03-05-2016, 09:13 PM Go to last post
  38. 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 01:29 PM
    • Replies: 9
    • Views: 350
    03-03-2016, 09:30 PM Go to last post
  39. 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 10:12 AM
    • Replies: 4
    • Views: 308
    03-03-2016, 07:02 PM Go to last post
  40. 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 01:38 PM
    confidence intervals, multiple comparisons
    • Replies: 2
    • Views: 234
    03-03-2016, 08:09 AM Go to last post
  41. 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 01:56 AM
    ar model, interpretation, time series
    • Replies: 2
    • Views: 183
    03-02-2016, 10:50 AM Go to last post
  42. 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 07:29 AM
    anova, association, chi square, kruskal-wallis anova
    • Replies: 0
    • Views: 170
    03-01-2016, 07:29 AM Go to last post
  43. 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 12:42 PM
    anova, minitab
    • Replies: 5
    • Views: 344
    02-29-2016, 05:07 AM Go to last post
  44. 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 02:07 AM
    analyze, data, presentation, research, visual
    • Replies: 0
    • Views: 205
    02-26-2016, 02:07 AM Go to last post
  45. 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 06:21 AM
    community, permanova, post-hoc
    • Replies: 3
    • Views: 413
    02-24-2016, 07:58 PM Go to last post
  46. 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 06:05 AM
    • Replies: 4
    • Views: 1,176
    02-23-2016, 11:09 AM Go to last post
  47. 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 07:15 PM
    categorical variable, dependent, dependent variable, independent, variables
    • Replies: 1
    • Views: 265
    02-23-2016, 01:54 AM Go to last post
  48. 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 01:43 PM
    • Replies: 3
    • Views: 329
    02-21-2016, 12:42 PM Go to last post
  49. 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 12:52 PM
    • Replies: 3
    • Views: 364
    02-20-2016, 02:08 PM Go to last post
  50. 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 11:34 AM
    binary dependent variable, chi sq, cochran's q test, non parametric, significance test
    • Replies: 0
    • Views: 202
    02-18-2016, 11:34 AM Go to last post
  51. 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 03:58 PM
    • Replies: 3
    • Views: 294
    02-13-2016, 07:13 PM Go to last post
  52. 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 06:10 PM
    research, statisitcs
    • Replies: 0
    • Views: 230
    02-12-2016, 06:10 PM Go to last post
  53. 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, 02-10-2016 11:56 PM
    • Replies: 0
    • Views: 244
    02-10-2016, 11:56 PM Go to last post
  54. 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 01:19 AM
    biology, scientific analysis, spss, uneven samples
    • Replies: 0
    • Views: 230
    02-10-2016, 01:19 AM Go to last post
  55. 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 10:02 PM
    • Replies: 0
    • Views: 194
    02-09-2016, 10:02 PM Go to last post
  56. 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: 1,310
    02-08-2016, 10:05 PM Go to last post
  57. 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 09:21 AM
    • Replies: 2
    • Views: 382
    02-06-2016, 01:36 PM Go to last post
  58. 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 02:11 PM
    dependent variables, design
    • Replies: 0
    • Views: 230
    02-04-2016, 02:11 PM Go to last post
  59. 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 02:25 PM
    ensemble, random forest
    • Replies: 1
    • Views: 296
    02-03-2016, 03:12 PM Go to last post
  60. 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 01:35 PM
    • Replies: 4
    • Views: 343
    02-01-2016, 08:05 PM Go to last post

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