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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: 18,620
    10-11-2014, 12:02 PM Go to last post
  1. Talking Suitable Model

    Hi all, I wonder if anyone could help me, i'm looking for an idea or two :) I work in the financial sector and we are looking into ways of...

    Started by Cope_LA2‎, 06-11-2015 09:46 AM
    finance, logistic, model, problem
    • Replies: 2
    • Views: 1,165
    06-12-2015, 02:44 AM Go to last post
  2. Graphical Method of Testing Cox Regression Model Fit

    Hi all, Since my last post you'll be happy to know i have successfully built a couple of what appear to be reasonable proportional hazard models...

    Started by Cope_LA2‎, 06-17-2015 10:58 AM
    • Replies: 0
    • Views: 950
    06-17-2015, 10:58 AM Go to last post
  3. Insignificant Results

    Just ran a simple regression, but got insignificant results. I know this is vague, but anyone have any idea why? Bad theory? Or something wrong in my...

    Started by Corolla‎, 08-05-2012 10:17 PM
    • Replies: 1
    • Views: 2,116
    08-05-2012, 10:33 PM Go to last post
  4. Cell count-which test to choose when comparing two groups to a control?

    Hello dear members of the Talkstats forum, In my research we counted algae cells with the counting chamber.N=8.We have the means of these three...

    Started by cos85‎, 03-21-2014 01:07 PM
    microbiology groups
    • Replies: 0
    • Views: 1,136
    03-21-2014, 01:07 PM Go to last post
  5. Need help on sampling

    I am very new to statistics so forgive my ignorance...I just need some help to get pointed in the right direction. I need to take some baseline...

    Started by cosmit‎, 05-19-2009 07:34 AM
    • Replies: 0
    • Views: 2,111
    05-19-2009, 07:34 AM Go to last post
  6. Question Perception of non-parametric techniques as inferior?

    Hi guys, I've recently worked on a project supervised by a lecturer in the school of psychology at my university. She's been looking over the...

    Started by CowboyBear‎, 05-07-2009 02:55 AM
    • Replies: 3
    • Views: 9,542
    05-08-2009, 06:17 AM Go to last post
  7. Randomization in an experiment

    Hi, everyone. I know randomization is basically to help guarantee that the experiment at hand doesn't systematically favor any condition over...

    Started by cowmoose‎, 01-19-2009 12:19 AM
    • Replies: 0
    • Views: 3,524
    01-19-2009, 12:19 AM Go to last post
  8. Regression on Binned data

    Hi, Can I carry out linear regression reliably with binned data. IE. data on cases falling into a series of ranges over time. I can imagine...

    Started by Cox‎, 11-30-2009 09:38 AM
    • Replies: 0
    • Views: 3,591
    11-30-2009, 09:38 AM Go to last post
  9. bell curve question

    I have data distributed unevenly on both side of the average.How do I go about normalizing the data so that it makes a perfect curve? I don't have a...

    Started by cpp_coder‎, 05-26-2008 01:49 PM
    • Replies: 10
    • Views: 6,512
    05-30-2008, 10:15 AM Go to last post
  10. Question Which statistic should i use?

    Hello, I don't know which statistic i should use for my situation: I have 30 spaceships with different caracteristics. I need to buy one,...

    Started by CRD‎, 09-28-2017 09:59 AM
    • Replies: 3
    • Views: 150
    09-28-2017, 11:53 AM Go to last post
  11. Looking for a better answer, if there is one (Puzzle)

    I've worked out a solution to a problem, but I was wondering if there might be a better way to do this. I'm using a computer to calculate these...

    Started by Creamsteak‎, 10-03-2008 02:42 PM
    • Replies: 1
    • Views: 2,590
    10-04-2008, 11:24 AM Go to last post
  12. Exclamation Probability Mass Functions

    I am having some trouble on understanding some problems on my practice exam. The prompt is: Let X1 and X2 have (the same) probability mass...

    Started by creative22‎, 10-12-2011 05:50 PM
    mass function, probability, random variable
    • Replies: 1
    • Views: 3,851
    10-12-2011, 10:53 PM Go to last post
  13. 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: 1,696
    01-07-2016, 12:07 PM Go to last post
  14. Stats Analysis Question =]

    Hey Everyone, Question!: In an aged-matched experiment, I want to compare . . . . I want to test the significance of DrugY on performance of...

    Started by Cristíona‎, 08-03-2012 07:38 PM
    experiment analysis, experimental design, stats
    • Replies: 0
    • Views: 1,294
    08-03-2012, 07:38 PM Go to last post
  15. HELP- Cumulative meta-analyses conceptual question!

    Hi, Based on the premise that cumulative meta-analysis is a "chronological combining of the experiments will show if there is a consistency in the...

    Started by croberto‎, 08-14-2016 05:27 PM
    • Replies: 1
    • Views: 1,270
    08-14-2016, 08:52 PM Go to last post
  16. One Way ANOVA - Dummy Variable and Post-Hoc Questions

    Hi Everyone! I am conducting a retrospective research study to determine if a new specific sign of an injury is correlated with more related injuries...

    Started by Crunch‎, 02-21-2014 12:02 PM
    anova, post hoc
    • Replies: 2
    • Views: 1,334
    02-22-2014, 08:22 PM Go to last post
  17. Likert Scale - Issue with Pivot point

    Dear all, I conducted a research in the field of construction management measuring the importance of some variables.I submitted the result in a...

    Started by cruxifixo‎, 08-26-2012 02:34 PM
    • Replies: 0
    • Views: 1,659
    08-26-2012, 02:34 PM Go to last post
  18. Statistical approach to 0 bounded skewed data?

    I'm working on a data set (neuronal spike density) that contained a lot 0 values and I am having a hard time trying to come up with a valid...

    Started by cshen28‎, 08-12-2012 11:21 PM
    • Replies: 1
    • Views: 2,331
    08-12-2012, 11:22 PM Go to last post
  19. How to Identify Change from Initial Values in Time Course Data

    Hello, I am currently working on my Masters Thesis and am trying to figure out a way to determine when my data is different or not from the...

    Started by csmith125‎, 11-14-2015 11:09 PM
    • Replies: 0
    • Views: 902
    11-14-2015, 11:09 PM Go to last post
  20. Target Value for Chi-Square Test

    I am working on a project that essentially involves "reversing" the chi-square test. A client wants to know what the expected value should be to see...

    Started by cswrye‎, 01-26-2011 05:55 PM
    chi-square
    • Replies: 1
    • Views: 2,152
    01-26-2011, 06:22 PM Go to last post
  21. Question - Is Simpson's Paradox the same as spuriousness

    Hi all, I am currently trying to learn about research methodology by using the book of Dooley called Social Research Methods. I am however a...

    Started by cs_ut‎, 11-07-2016 05:34 PM
    • Replies: 3
    • Views: 3,322
    11-08-2016, 08:35 AM Go to last post
  22. Factor analysis with multiple constructs

    Hi all, Have a question related to factor analysis and how to execute it. For instance, in a survey you measure 3 seperate constructs, and use 5...

    Started by cs_ut‎, 03-23-2017 09:28 AM
    • Replies: 2
    • Views: 1,193
    03-24-2017, 08:36 AM Go to last post
  23. model selection - keeping binned and continous version of variables in same model

    Hello, I have a dataset of about 160,000 observations and I'm trying to build a binary classifier. Lets call my variable to be classified Y and my...

    Started by Ctiger06‎, 04-22-2014 09:37 AM
    • Replies: 1
    • Views: 987
    04-22-2014, 09:49 AM Go to last post
  24. Missing Data

    I used an original survey form to collect data and afterwards realized that the final copy of that survey included a question that was not on the...

    Started by ctphd2b‎, 03-20-2012 08:02 PM
    • Replies: 6
    • Views: 1,990
    03-21-2012, 09:22 PM Go to last post
  25. combining weighted p-values across multiple studies

    Hello, I am not someone who is extremely familiar with statistical theory so I have had to do a lot of reading to arrive at these ideas. I am...

    Started by cukymonster‎, 05-05-2013 10:24 PM
    p-values
    • Replies: 0
    • Views: 1,395
    05-05-2013, 10:24 PM Go to last post
  26. combining results obtained from 3 different methods

    Hello, I have received data tables where 3 methods have been used on 54 different variables. Method 1 (M1): multivariate model of logistic...

    Started by cukymonster‎, 08-12-2013 06:23 PM
    cutoff, method comparison, ranking, results integration
    • Replies: 0
    • Views: 1,263
    08-12-2013, 06:23 PM Go to last post
  27. Testing for a difference in standard deviation

    Hello Everyone I've encountered the following problem - I have this test that was administrated to a sample of participants, in a 2X2 design (both...

    Started by Curious guy‎, 02-26-2015 07:44 AM
    • Replies: 0
    • Views: 1,117
    02-26-2015, 07:44 AM Go to last post
  28. Question How to report t-test, CIs, cohen's d etc of log-transformed data

    I am wondering what is best/normal practice for reporting the results of an independent t-test of log-transformed data? For context, I am...

    Started by cxds‎, 07-08-2017 07:57 AM
    back transformation, cohen's d, log transformation, reporting, t-test two-sample
    • Replies: 0
    • Views: 289
    07-08-2017, 07:57 AM Go to last post
  29. A Quick Question Concerning Repeated Measures of ANOVA.

    Hello Everyone! I am working on the capstone thesis project for my Master's degree and hoping for some professional assistance to determine if I...

    Started by cyanide‎, 10-18-2011 07:53 PM
    • Replies: 1
    • Views: 2,241
    10-19-2011, 12:58 PM Go to last post
  30. Volume of confidence intervals for Multinomial distributions

    Hi, I'd like to know the formula for calculating the volume of the confidence (rectangular) region for the multinomial distribution. I've already...

    Started by cyb3r.dani‎, 11-09-2010 09:50 AM
    • Replies: 0
    • Views: 3,359
    11-09-2010, 09:50 AM Go to last post
  31. Exploratory Factor Analysis problems

    Independent Variable: 49 state survey of state court administration: how much power does the state court administrator have over 31 separate...

    Started by cynicalflyer‎, 08-11-2015 03:22 PM
    • Replies: 2
    • Views: 1,317
    08-12-2015, 07:44 AM Go to last post
  32. p value for pooled data

    Hi all, In my research analysis, I've used the multiple imputation technique in SPSS to handle missing data. So far, so good. Now I'm running...

    Started by c_alderweireld‎, 07-14-2014 08:48 AM
    • Replies: 2
    • Views: 1,477
    07-14-2014, 10:16 AM Go to last post
  33. Thumbs down Internal consistency reliability

    Hi there, I have a question about the internal consistency reliability. In a within-subject design, I created a 13-item of self-repeated 9-point...

    Started by C_SH_Yeh‎, 10-11-2010 07:52 AM
    • Replies: 0
    • Views: 2,942
    10-11-2010, 07:52 AM Go to last post
  34. No Standard Deviation

    Hello statistical geniuses, I have 450 items and I want to test a sample and be sure with 95% confidence that if all of my tested items are...

    Started by DAD‎, 01-13-2014 12:04 PM
    • Replies: 5
    • Views: 1,796
    01-13-2014, 04:00 PM Go to last post
  35. 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: 6,482
    01-08-2013, 06:19 PM Go to last post
  36. Best design for this experiment?

    Hello all. I am having some trouble with my experiment and would be the best way to analyze the data. I have 4 different chemicals each at one...

    Started by daelve‎, 08-25-2011 07:08 PM
    2 Pages
    1 2
    • Replies: 16
    • Views: 4,870
    08-26-2011, 04:55 PM Go to last post
  37. ANOVA, Mann-Whitney or both?

    I want to calculate the statistics of a clinical study with SPSS. 4 groups with 16 variables and I want to compare the mean values of every...

    Started by DaH‎, 10-02-2013 07:57 AM
    • Replies: 0
    • Views: 1,498
    10-02-2013, 07:57 AM Go to last post
  38. Relative importance of predictors in logistic regression

    I would like to assess the relative importance of independent variables in a logistic regression model. Previously I have used the 'R' statistic the...

    Started by daisystat‎, 11-26-2013 10:04 AM
    • Replies: 0
    • Views: 1,096
    11-26-2013, 10:04 AM Go to last post
  39. When is standardisation of data necessary?

    I am running regression analysis and cluster analysis on a data set. The variables differ in their scale of measurement – some variables are ratings...

    Started by daisystat‎, 11-20-2013 03:32 PM
    • Replies: 0
    • Views: 1,097
    11-20-2013, 03:32 PM Go to last post
  40. Standard error of a weighted composite score

    I would like to calculate the standard error of a weighted composite score. The composite score is based on the sum of a respondent's rating to a...

    Started by daisystat‎, 11-19-2013 03:44 PM
    • Replies: 2
    • Views: 2,732
    11-20-2013, 03:10 PM Go to last post
  41. ANOVA of factor analysis results

    Hello, new to the forum, and I'm in a bit of a bind with some data analysis for my thesis. I have conducted Principle Axis Factoring (using SPSS,...

    Started by dalsauks‎, 02-01-2011 12:39 AM
    • Replies: 0
    • Views: 3,695
    02-01-2011, 12:39 AM Go to last post
  42. 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: 1,226
    04-19-2016, 05:21 PM Go to last post
  43. Question Calculating a P-value for a two-tailed One-Standard-Deviation chi-square Test

    How does one calculate a P-value for a two-tailed One-Standard-Deviation chi-square Test? Before we begin, I would like to say thank you for...

    Started by damienpf‎, 04-04-2009 12:32 PM
    • Replies: 0
    • Views: 12,140
    04-04-2009, 12:32 PM Go to last post
  44. 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: 1,508
    01-31-2016, 03:09 AM Go to last post
  45. 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
    ancova
    • Replies: 0
    • Views: 2,884
    03-24-2016, 12:35 PM Go to last post
  46. Quality Control with statistics

    I'm working with a dataset consisting of just over 2 years of 5 minute data. For roughly 7 months of this time my instrument was not functioning...

    Started by Dan1234‎, 11-02-2012 11:14 AM
    • Replies: 0
    • Views: 884
    11-02-2012, 11:14 AM Go to last post
  47. 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: 1,547
    12-15-2012, 07:44 AM Go to last post
  48. Cumulative heat units - what is a valid way of determining difference between sites

    Background: I work for a blueberry grower. The accumulation of heat units is important in understanding and predicting the development of the plant...

    Started by Dan@nzg‎, 07-20-2014 09:23 PM
    • Replies: 0
    • Views: 2,216
    07-20-2014, 09:23 PM Go to last post
  49. Contingency tables with an expected value of 0

    Hi all. I would like to compare two contingency tables (expected and observed). Unfortunately, one of my expectancy cells is 0, which rules out a...

    Started by DanaSchneiderDJS‎, 03-18-2011 09:29 PM
    • Replies: 6
    • Views: 6,980
    03-21-2011, 01:34 AM Go to last post
  50. Question When homogeniety of regression slopes (for ANCOVA) is significant.

    HI, I have conducted an ANCOVA and have a significant interaction when testing the homogeniety of regression slopes assumption. My IV is Group...

    Started by DancingSpirit‎, 03-19-2012 11:45 PM
    • Replies: 0
    • Views: 1,300
    03-19-2012, 11:45 PM Go to last post
  51. P value significance after FDR correction

    Dear stats experts, I have a question I'm hoping someone out there might be able to answer for me. When running FDR corrections on behavioural...

    Started by DanDJDLC‎, 08-23-2013 01:17 PM
    • Replies: 2
    • Views: 1,766
    08-23-2013, 02:52 PM Go to last post
  52. Proposed Research Topic and Design

    I am a proposing a research topic and want to see if what I propose is possible given the data I have. If not, I would like to hear your ideas on...

    Started by DaNegotiator‎, 05-05-2013 11:06 AM
    • Replies: 1
    • Views: 1,129
    05-05-2013, 05:07 PM Go to last post
  53. Is there a test...

    Hi there! I have a new work project and I'm finding it challenging to select the approriate test. I'm not even sure if the right test exists so...

    Started by danib‎, 07-23-2014 03:04 PM
    • Replies: 5
    • Views: 1,809
    07-23-2014, 10:54 PM Go to last post
  54. MLE for correlation (not covariance) matrix?

    Is there an efficient way to estimate the correlation matrix for the D-dimensional r.v. \mathcal X = (\mathcal X_1, \ldots, \mathcal X_D) under the...

    Started by Daniel Dvorkin‎, 02-08-2013 10:06 AM
    • Replies: 4
    • Views: 3,651
    02-08-2013, 11:33 AM Go to last post
  55. t-test with class labels as probabilities

    I'm trying to find a generalization of the t-test that I'm sure someone has done before; I just can't seem to find a reference, probably because I've...

    Started by Daniel Dvorkin‎, 10-14-2013 12:31 PM
    • Replies: 2
    • Views: 1,596
    10-14-2013, 02:09 PM Go to last post
  56. How do I determine the Correlation Coefficient from a best fitting equation.

    I'm confused about how to determine the correlation coefficient after you find a linear regression line formula. I'm porting some linear...

    Started by Daniel Savage‎, 08-11-2011 11:32 AM
    • Replies: 0
    • Views: 1,821
    08-11-2011, 11:32 AM Go to last post
  57. Centering for interactions in multiple regression ??

    This is an e-mail about our discussion. Can someone please help us. I cannot understand any reason to center the variables other than "well it just...

    Started by danielkeeton‎, 11-11-2008 09:37 AM
    • Replies: 5
    • Views: 25,797
    12-01-2008, 06:50 PM Go to last post
  58. Can anyone explain Poisson regression for doing time trend?

    It would be a big help if someone could give a practical example (by hand) how Poisson regression is used to calculate a time trend line, and...

    Started by daniel_goldman‎, 02-18-2014 04:40 AM
    poisson regression, time trend
    • Replies: 12
    • Views: 6,650
    02-19-2014, 06:52 PM Go to last post
  59. Giving statistical significance to the max value of a vector

    Hi, I have many samples, each sample is a vector with n elements. Each element represents a state, and the value in a cell is how likely this...

    Started by danny‎, 10-23-2012 03:11 AM
    • Replies: 4
    • Views: 1,860
    10-29-2012, 11:32 AM Go to last post
  60. Time Series Dummy Variable and Time Trend

    Hi, I currently have some research going on that requires me to put in a time trend variable t = {1,2,3,4,.....,N} where N is the total number of...

    Started by dannylimstata‎, 05-01-2012 11:55 PM
    • Replies: 1
    • Views: 5,178
    05-02-2012, 12:04 AM Go to last post

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