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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: 18,738
    10-11-2014, 12:02 PM Go to last post
  1. Proper bayesian scaling of data

    I work as a Ph.D. student in structural bioinformatics, and build bayesian models for our data. It's been quite a while since I stumbled upon the...

    Started by Yannick‎, 07-07-2011 01:32 AM
    bayesian inference, likelihood principle, prior, scale parameter
    • Replies: 0
    • Views: 2,409
    07-07-2011, 01:32 AM Go to last post
  2. paired t test and simple linear regression

    Two repeatedly measured samples: 15 subjects were measured by two different machines (old and new) for their weight subject machine 1 machine...

    Started by manoa‎, 07-06-2011 04:48 PM
    • Replies: 3
    • Views: 11,427
    07-06-2011, 05:48 PM Go to last post
  3. What statistical model could possibly be used here?

    Hi guys, Could you please have a look at the chart attached? I'm just wondering what statistical model could possible be used here to create that...

    Started by JennyK‎, 07-06-2011 12:09 AM
    • Replies: 0
    • Views: 1,964
    07-06-2011, 12:09 AM Go to last post
  4. Help needed with Multiple Correspondence Analysis

    Greetings, I am looking for resources (books, websites, articles) that can help me, in the simplest way possible (i.e. step by step), figure out...

    Started by rhazlettknudsen‎, 07-05-2011 04:08 PM
    • Replies: 2
    • Views: 3,908
    07-05-2011, 06:54 PM Go to last post
  5. Difficult forecasting/ density estimation problem in an experimental setting

    Hi everyone, I am researcher conducting a set of economics experiments that are eventually supposed to produce some forecasts for a given playerís...

    Started by whaddup‎, 07-02-2011 04:23 PM
    • Replies: 4
    • Views: 3,210
    07-05-2011, 12:27 PM Go to last post
  6. Pre and Post Likert Scale Survey Help

    Hi, I am needing some help with a survey I am trying to get ready to conduct. The survey will be a pre and post survey given to the same group of...

    Started by rx_student‎, 07-05-2011 11:22 AM
    • Replies: 1
    • Views: 4,371
    07-05-2011, 11:27 AM Go to last post
  7. Inter-observer variability

    Dear all, I hope so much anyone here may help me with my question regarding inter-observer variability: 3 observers measure the diameter of...

    Started by med1234‎, 06-29-2011 06:15 PM
    • Replies: 13
    • Views: 23,628
    07-02-2011, 06:36 PM Go to last post
  8. Challenge: dependent variable observed randomly over time

    Hello everyone, I have been working on this problem and couldn't find a solution so any kind of help is more than welcome! I have data ranging...

    Started by Peter_Hoft2‎, 06-29-2011 08:55 AM
    missing, panel data, time series
    • Replies: 1
    • Views: 2,098
    07-01-2011, 01:41 AM Go to last post
  9. Mancova help

    Hello everyone, I wanted to test the effectiveness of a new teaching method. I asked 5 teachers to use this new method in their classes, and used...

    Started by Ali H‎, 06-30-2011 08:58 AM
    • Replies: 0
    • Views: 1,446
    06-30-2011, 08:58 AM Go to last post
  10. Power curve of distribution with 2 parameters

    Hello. I want to obtain a power curve for goodness of fit test of a distribution with 2 parameters, let say A & B. My test is actually about...

    Started by tsukiko‎, 06-30-2011 06:43 AM
    hypothesis testing, power, simulation study
    • Replies: 1
    • Views: 2,043
    06-30-2011, 08:42 AM Go to last post
  11. Individual level moderator in HLM? Need help, please!

    Hi, I'm working on a paper about the influence of a group-level variable on a individual-level variable and want to add an individual-level...

    Started by stef‎, 05-25-2011 07:15 AM
    • Replies: 2
    • Views: 5,686
    06-29-2011, 07:23 AM Go to last post
  12. Question One-tail test for research

    Hello, I am new to research metholologies and statistical testing. Currently, I am involved in the data analysis section of research. My instructor...

    Started by pejmartin‎, 06-26-2011 08:05 PM
    hypothesis testing, one-tail test, quantitative, survey research design
    • Replies: 1
    • Views: 2,288
    06-26-2011, 08:45 PM Go to last post
  13. Test of Significance?

    I want to conduct a significance test in finding the significance between either a C+ vs a B- in AP statistics class will affect chances of attending...

    Started by columbia‎, 06-21-2011 09:49 PM
    3 Pages
    1 2 3
    • Replies: 42
    • Views: 7,698
    06-24-2011, 06:30 PM Go to last post
  14. Principal Components and Q-statistic

    In PCA, when we transform the p original variable to PCs, we will have two parts which are called explained (1 to k PCs) and unexplained variables...

    Started by poovich‎, 06-23-2011 05:47 AM
    • Replies: 0
    • Views: 1,813
    06-23-2011, 05:47 AM Go to last post
  15. Forest Plots - Please Help!!!!!

    How can I create forest plots? I want to calculate the odds ratio effectiveness of two treatments.. Can I create forest plots using SPSS (PASW)?...

    Started by Astero‎, 06-22-2011 12:44 PM
    forest plots, statistics, statistics help
    • Replies: 3
    • Views: 8,814
    06-22-2011, 05:55 PM Go to last post
  16. test whether 2 mean scores are significantly different

    I have two groups of participants; 1 group received treatment A and the other group received treatment B. I have the mean scores of the effectiveness...

    Started by Astero‎, 06-22-2011 09:28 AM
    psychology, spss, statistical test, statistics, statistics help
    • Replies: 9
    • Views: 9,930
    06-22-2011, 03:09 PM Go to last post
  17. Thumbs up Significance in a Yes/No question

    Hi, So I'm working on a research project that is looking into whether there's a statistically significant difference between pilots in their...

    Started by airwee‎, 04-30-2011 03:45 PM
    • Replies: 2
    • Views: 5,732
    06-22-2011, 02:01 PM Go to last post
  18. Tensor product

    Hi in the context of a generalized additive model, can someone explain what is meant by a fully nested tensor product? In the R package mgcv,...

    Started by bugman‎, 06-22-2011 01:49 AM
    • Replies: 0
    • Views: 1,645
    06-22-2011, 01:49 AM Go to last post
  19. Sample size

    Dear ALL, I am planning to run a survey that targets a number of foreigners in country A. The population of the foreigners is 50,000 individuals...

    Started by Ojazee‎, 06-19-2011 10:53 AM
    • Replies: 1
    • Views: 1,496
    06-21-2011, 03:59 AM Go to last post
  20. Random sample - how to get one?

    Hi, Iím doing a research on job satisfaction in lawyers and I would like to use a random sample. My question is: how can I do this? In the whole...

    Started by L.A.‎, 06-17-2011 06:12 PM
    random sample
    • Replies: 5
    • Views: 3,233
    06-18-2011, 09:03 AM Go to last post
  21. Normality assumption test statistic for independent sample t-test (SigmaPlot output)

    I'm using SigmaPlot12 to compare the means/medians of two populations. First, I run the Mann-Whitney Rank Sum Test. The software recommends using...

    Started by cassarch‎, 06-14-2011 11:00 AM
    • Replies: 0
    • Views: 4,324
    06-14-2011, 11:00 AM Go to last post
  22. ANOVA vs. T-Test --> completely different results

    If I compare three treatment groups with ANOVA (and Bonferroni posttesting), I get no significant difference results between groups (p>0.05)......

    Started by med1234‎, 06-13-2011 02:16 PM
    • Replies: 7
    • Views: 18,291
    06-14-2011, 12:14 AM Go to last post
  23. Mann-Whitney or independant T-test?

    Hey all, I'm in the middle of a study comparing a group of CONTROL MICE vs EXPERIMENTAL MICE before and after a stroke. I'm looking at comparing:...

    Started by dkhamoo‎, 04-15-2011 10:56 AM
    • Replies: 3
    • Views: 4,338
    06-13-2011, 05:01 PM Go to last post
  24. Statistical question about roulette

    I was wondering if anyone could help me with a statistics question I have? It would be great if anyone could look at this one. It is based on...

    Started by sbsx2‎, 06-13-2011 08:45 AM
    • Replies: 5
    • Views: 4,707
    06-13-2011, 04:37 PM Go to last post
  25. Contradictory Results re. Normality Tests

    Hello, I've got an issue regarding normality, I have tried to figure it out but need some help please. Checking for normality of the variable...

    Started by eoinmc‎, 04-26-2011 10:17 AM
    2 Pages
    1 2
    • Replies: 15
    • Views: 9,973
    06-13-2011, 03:43 PM Go to last post
  26. Red face Estimating a term

    I have observations on t_i, where t_i = a_i + b_i. a_i = \mu + e_i, where \mu is constant and e_i is the usual error term with mean 0. I also know...

    Started by jessica01‎, 06-13-2011 02:52 PM
    • Replies: 5
    • Views: 1,914
    06-13-2011, 03:37 PM Go to last post
  27. Red face How to calculate the Margin of Error for 3 candidates?

    I know how to figure out the Margin of Error for 2 candidates, e.g. @ http://fisher.utstat.toronto.edu/reid/sci199y/oct8/oct8.html But, how to...

    Started by Learning2011‎, 05-14-2011 09:18 PM
    • Replies: 2
    • Views: 2,560
    06-13-2011, 03:03 PM Go to last post
  28. Calculating proability

    If the probability of a resulting number being 10 is %80 chance, 5 %50 and -2 %40 what is the most probable outcome(it could be between values) based...

    Started by Noobie‎, 05-26-2011 05:48 AM
    • Replies: 3
    • Views: 2,052
    06-13-2011, 02:37 PM Go to last post
  29. planned comparisons using the overall error term from the ANOVA

    I have run a repeated measures ANOVA on my data and would like to run planned contrasts using the error term from the interaction. I cannot remember...

    Started by staryeyed‎, 06-11-2011 04:35 PM
    • Replies: 1
    • Views: 2,184
    06-11-2011, 05:09 PM Go to last post
  30. Multiple Comparisons Correction for Post Hocs in 2x2 mixed ANOVA?

    Hi Guys, Doing post hoc analyses on ERP data at present, and am looking at a 2x2 structure, with one between and one within subject factor (2...

    Started by MonsieurCarey‎, 06-10-2011 12:29 PM
    • Replies: 0
    • Views: 2,269
    06-10-2011, 12:29 PM Go to last post
  31. Online Sample Size Calculators

    I'm hoping someone can help me with a question that seems entirely too simple. A colleague and I are working on a study. Our total population is...

    Started by tnick‎, 06-07-2011 08:51 PM
    • Replies: 1
    • Views: 2,599
    06-09-2011, 11:00 AM Go to last post
  32. Audit sample methodology question ... what do you call this?

    Hi there, This may be a method question rather than a stats one, but I'm hoping someone can help. Here's the situation in brief: I work in...

    Started by AndyB‎, 06-08-2011 02:22 AM
    • Replies: 0
    • Views: 2,118
    06-08-2011, 02:22 AM Go to last post
  33. continuous random variable

    why the continuous random variable has to be given a Limit /Range? Cant we solve this random variable without a limit ? What is Continuous...

    Started by edifier‎, 06-03-2011 06:14 PM
    • Replies: 6
    • Views: 2,944
    06-06-2011, 03:43 PM Go to last post
  34. calculating sample size

    Hi I am a research project virgin, & I'm having a hard time understanding how you estimate your sample size. My project entails performing a...

    Started by roblox‎, 05-29-2011 02:38 PM
    • Replies: 1
    • Views: 2,569
    06-04-2011, 05:17 AM Go to last post
  35. Calculating Effect Size

    Hi everyone I want to calculate the effect size for the national data with sample size more than ten thousand for the Independent Sample t-test and...

    Started by shafiqurrehman1‎, 05-17-2011 01:01 AM
    • Replies: 7
    • Views: 4,518
    05-24-2011, 11:57 PM Go to last post
  36. Analyzing with heavy skew, transforms not working?

    I have a set with around 200 individuals dealing with cognitive task scores. Most of it is skewed heavily and I'm trying to analyze ideally with a...

    Started by excellrec‎, 05-19-2011 02:25 PM
    • Replies: 7
    • Views: 2,768
    05-24-2011, 06:08 PM Go to last post
  37. regression when the dependent variable is a proportion or percent?

    If my outcome was dichotomous, I would use logistic regression. It my outcome was continuous, I would use linear regression. If my outcome was a...

    Started by proctice‎, 05-23-2011 03:04 PM
    • Replies: 1
    • Views: 4,305
    05-23-2011, 03:46 PM Go to last post
  38. Modeling the Intervention

    I have data at event A to predict a later event B. Fit using a multiple logistic regression model. In order to improve the positive outcome rate...

    Started by JAH‎, 05-23-2011 11:10 AM
    • Replies: 0
    • Views: 1,679
    05-23-2011, 11:10 AM Go to last post
  39. Time series: Research paper - VAR modeling

    Hi everyone, I am conducting a statistical research using VAR modeling. So my plan is to conduct a 4-variable VAR(2) on the following: 1)...

    Started by E574‎, 05-21-2011 10:09 AM
    • Replies: 0
    • Views: 3,865
    05-21-2011, 10:09 AM Go to last post
  40. Need help in finding historic data on real interest rate and CPI

    Hi everyone, In my research I use several financial instruments including real interest rate and real CPI. So far, I have been unable to find any...

    Started by E574‎, 05-18-2011 11:28 AM
    • Replies: 3
    • Views: 4,235
    05-21-2011, 10:01 AM Go to last post
  41. chi-square with small sample size

    I want to test whether fish prefer rocky habitat over flat habitat. The study site is 5% rocky and 95% flat. I found 6 fish in rocky habitat and 2...

    Started by fishystats‎, 05-19-2011 10:39 PM
    • Replies: 6
    • Views: 8,974
    05-20-2011, 12:24 PM Go to last post
  42. Question Can someone edumacate me about this? About comparing two samples


    Started by TheMonk‎, 05-18-2011 02:05 PM
    • Replies: 0
    • Views: 2,220
    05-18-2011, 02:05 PM Go to last post
  43. Calculating significativity on a preference question.

    E.g.: 200 consumers test 2 different products, 1 after the other. After they tested and evaluated both products, they have to give their preference....

    Started by SteveBaker‎, 05-18-2011 04:20 AM
    • Replies: 0
    • Views: 1,937
    05-18-2011, 04:20 AM Go to last post
  44. Impulse Response Functions

    I have obtained point estimates for impulse response functions. How can I tell if it's values are significant?

    Started by llagalo‎, 05-18-2011 02:11 AM
    confidence interval, impulse response, standard deviation, time series analysis
    • Replies: 0
    • Views: 1,266
    05-18-2011, 02:11 AM Go to last post
  45. i Need help plz

    hello! i'm a new member between u and i have really a big problem with my prof! if 1 of u have an idea about how and from where can i download...

    Started by M!ss Moon‎, 05-17-2011 06:24 PM
    • Replies: 0
    • Views: 1,235
    05-17-2011, 06:24 PM Go to last post
  46. Simple Random Sampling - Variance Of An Estimator

    I am having problems with the following problem (from Cochran's "Sampling Techniques", 3rd edition, p.49, question 2.19): Suppose in a population...

    Started by TheFirstOrder‎, 05-15-2011 02:23 AM
    variance estimator
    • Replies: 5
    • Views: 5,610
    05-16-2011, 09:56 AM Go to last post
  47. How do I compare different demographic groups that did the same survey?

    Hi, this is my first post so apologies in advanced if I'm asking things incorrectly! I'm doing a market research course and we've conducted a...

    Started by jamieaa64‎, 05-16-2011 06:11 AM
    • Replies: 0
    • Views: 2,865
    05-16-2011, 06:11 AM Go to last post
  48. HLM and SEM

    I'm not sure if this is the right forum for this question, but I'll keep my fingers crossed... I'm in a Ph.D. program and am definitely more of a...

    Started by strumpeace‎, 05-12-2011 10:33 PM
    • Replies: 4
    • Views: 7,729
    05-14-2011, 02:31 PM Go to last post
  49. Paired t- test experiment

    Hello, I have a sample 20 super market stores of a specific chain (who has in total 100 super market stores). In 1st of July there was an increase...

    Started by zarasandreas‎, 05-14-2011 05:34 AM
    • Replies: 0
    • Views: 2,933
    05-14-2011, 05:34 AM Go to last post
  50. Need help with data analysis

    Ok so here is the situation. I have a data set that I'm not really sure how to analyze. I have a list of 500,000 scores and each score has a value....

    Started by yoman2‎, 05-12-2011 12:54 PM
    • Replies: 4
    • Views: 1,690
    05-13-2011, 03:16 PM Go to last post
  51. random assignment

    does anyone know what is a random assignment in a true experiment. Thanks

    Started by dnice06‎, 05-12-2011 01:21 AM
    • Replies: 1
    • Views: 1,676
    05-13-2011, 01:06 AM Go to last post
  52. Can anyone help please?

    Hi there, for my dissertation I wanted to know the important factors that managers consider in selecting a supplier. I used a likert scale 1-5 from...

    Started by gizmo00‎, 05-08-2011 02:45 PM
    • Replies: 3
    • Views: 1,719
    05-12-2011, 10:59 AM Go to last post
  53. Question 2 independent var, 1 dependent var. What test should I use? Help wanted please!

    I desperately need some help with my research please. I am researching the effect of instruction in primary school and secondary school. My aim is...

    Started by Dutchie‎, 05-10-2011 07:17 AM
    • Replies: 0
    • Views: 1,688
    05-10-2011, 07:17 AM Go to last post
  54. Assistance with Comparing Two Months of Survey Data

    I'm probably making this harder than it is but I'll ask for opinions anyways. I'm trying to analyze two months of Yes/No survey data. Each month...

    Started by evo8cutie‎, 05-09-2011 08:46 PM
    • Replies: 1
    • Views: 1,958
    05-09-2011, 09:59 PM Go to last post
  55. Negative Cronbach !

    Can anyone help me, I am having a negative cronbach value.. Does it mean my data is unreliable? I have a set of 10 questions with likert scale...

    Started by gizmo00‎, 05-09-2011 01:17 PM
    • Replies: 2
    • Views: 2,227
    05-09-2011, 05:03 PM Go to last post
  56. MANOVA Help

    Help me please! I do not know how to interpret these stats...can someone help me answer these and explain how you got the answers... Box's Test of...

    Started by lostintranslation14‎, 05-08-2011 10:47 PM
    • Replies: 0
    • Views: 2,996
    05-08-2011, 10:47 PM Go to last post
  57. Optimum solution: Matching Investment & Highest interest

    We have multiple securities. Each one has Maturity amount and Interest. Maturity Amount range between USD 100 to USD 1M. Each has corresponding...

    Started by pks_2010‎, 05-06-2011 08:30 PM
    • Replies: 5
    • Views: 1,871
    05-07-2011, 07:58 AM Go to last post
  58. Test in binomial distribution

    Hi all. I have been staring at Table 3 in the attached paper for some time now. I can't figure out how they came up with their p-values. I does...

    Started by mads_st‎, 05-06-2011 06:37 AM
    • Replies: 4
    • Views: 2,376
    05-06-2011, 12:27 PM Go to last post
  59. Manual

    Hi guys, I'm a geologist and I'm looking for a good manual to learn about with power law distribution and maximum likehood (beginner-medium...

    Started by nicolaslecorvec‎, 05-05-2011 06:14 PM
    fractal, maximum likehood, power law
    • Replies: 0
    • Views: 1,989
    05-05-2011, 06:14 PM Go to last post
  60. Pilot Test Return Rate

    I am working on developing a survey with 300 participants. The new survey instrument must be pilot tested. I am planning on running a pilot of 30...

    Started by celesteo‎, 05-05-2011 05:16 PM
    • Replies: 0
    • Views: 1,729
    05-05-2011, 05:16 PM Go to last post

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