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Forum: Statistics

Statistics course and homework discussion. Elementary statistics.

  1. Sticky Thread Sticky: Forum Guidelines: Smart posting behavior pays off

    Welcome to talkstats.com, the place for statistics help. This is a guideline for people who want to ask a question on this forum and value a...

    Started by TheEcologist‎, 11-27-2010 12:13 PM
    • Replies: 1
    • Views: 200,376
    07-16-2014, 11:01 AM Go to last post
  2. Arrow Sticky Thread Sticky: We only provide homework help to those who show effort

    Welcome to Talk Stats Forum. In order to keep homework help effective and efficient, we request all members to abide by these guidelines: 1)...

    Started by quark‎, 09-30-2005 09:44 AM
    • Replies: 0
    • Views: 68,587
    09-30-2005, 09:44 AM Go to last post
  1. Sample Size Determination

    Letís say I have a population of 70000. The goal is to get a ďstatistically significantĒ sample (respondents ) for a survey. The sample size is...

    Started by Curious George‎, 06-15-2016 07:58 PM
    • Replies: 0
    • Views: 858
    06-15-2016, 07:58 PM Go to last post
  2. Multiple testing: Rate of false positives

    Hello all, I hope you're well. I have an elementary question that I hope someone can help me with. I am reading this protocol: Love MI,...

    Started by MexicanBiologist‎, 06-15-2016 02:15 PM
    • Replies: 1
    • Views: 1,145
    06-15-2016, 03:02 PM Go to last post
  3. Paradox? setting up sampe size with alfa and beta error and analyzing it with t-test

    There seems to be some strange things: 1) you want to set-up a Design of experiments: using statistics tools; size = 10 ; alfa = 0.05 ; difference...

    Started by bartallaert‎, 06-14-2016 06:50 AM
    • Replies: 0
    • Views: 979
    06-14-2016, 06:50 AM Go to last post
  4. What test should I use?

    Hi, I am trying to do a statistical analysis on some data I collected at Uni and I am really confused about which test to use. I applied a range...

    Started by Bonnie2016‎, 06-13-2016 07:15 AM
    logistic regression
    • Replies: 1
    • Views: 1,119
    06-13-2016, 09:36 AM Go to last post
  5. Question Working out standard deviation for three random variables with different sized ranges

    X = {1,2,3,4,5,6}, Y = {1,2,3,4}, Z = {2,4,6,8}. The question is: work out standard deviation of A = 2S-1, where S = the sum of the three random...

    Started by aigarsplatinum‎, 06-12-2016 05:45 PM
    probability, randomvariable, standarddeviation, statistics assignment, variance
    • Replies: 0
    • Views: 1,337
    06-12-2016, 05:45 PM Go to last post
  6. Pillaiís Trace

    Of the 4 test statistics commonly used for MANOVA why is Pillaiís Trace used most often?

    Started by pupupanda‎, 06-12-2016 04:20 PM
    statistic, statistical analysis, statistical help
    • Replies: 0
    • Views: 2,539
    06-12-2016, 04:20 PM Go to last post
  7. Parametric or non-parametric test?

    Dear all, Iím not fluent in statistical data analysis and I canít afford the services of a professional. Please I really need your suggestions with...

    Started by Maxilo‎, 06-12-2016 12:34 PM
    • Replies: 2
    • Views: 1,724
    06-12-2016, 02:35 PM Go to last post
  8. Equivalency testing - CI approach and TOST don't match

    Hey everyone, I'm doing some equivalency testing with both the CI approach and TOST to demostrate the equivalency of two scanning methods. For...

    Started by Charlotte123456‎, 06-12-2016 11:15 AM
    confidence intervals, equivalnecy testing, normal distribution, p values
    • Replies: 5
    • Views: 1,579
    06-12-2016, 02:18 PM Go to last post
  9. Smile test of logistic regression constant

    Hello, everyone! I wonder whether anyone knows how can i intepret a coefficient of constant in logistic regression. I have used "logistic" in...

    Started by Lisa92‎, 06-12-2016 05:10 AM
    logisitic regression, odds, odds ratio
    • Replies: 1
    • Views: 1,242
    06-12-2016, 12:14 PM Go to last post
  10. Simspons Diversity Index

    I have calculated the simpsons diveristy index for three different strata: Understorey (1-D= 0.55), Subcanopy (1-D=0.77), canopy (1-D=0.83) How...

    Started by deano6‎, 06-10-2016 09:07 AM
    biology, significance, simpson's diversity index, spss
    • Replies: 1
    • Views: 1,207
    06-10-2016, 10:49 AM Go to last post
  11. Question Can we model the experiments as a stochastic process and estimate the sample size?

    I have an image with the size `5575x9440` and I'm implementing a modified version of the algorithm used in this paper on it, but because the code...

    Started by sepinaz‎, 06-10-2016 10:01 AM
    applied statistics, probability distributions, random variables, sampling, stochastic processes
    • Replies: 0
    • Views: 820
    06-10-2016, 10:01 AM Go to last post
  12. Paired T Test ???

    Hi I am trying to work out which statistical test to use to determine whether there is a relationship between visual acuity (how small letters on...

    Started by confused?‎, 06-07-2016 11:20 AM
    paired t, paired t-test
    • Replies: 5
    • Views: 1,361
    06-09-2016, 01:43 PM Go to last post
  13. Question Back transformation of p-values

    Hi everybody, I am currently working with some raw data which are not normally distributed (ND). I have now transformed the data with squareroot...

    Started by kimmieb‎, 06-07-2016 07:33 AM
    • Replies: 2
    • Views: 2,032
    06-08-2016, 04:18 PM Go to last post
  14. Reasons and advantages of using an ANCOVA instead of a Regression

    Hello everyone, Just wondering if any of you could help me. Just wondering when the variables Iím using can be used for both ANCOVA and...

    Started by ANCOVA'D‎, 06-08-2016 08:59 AM
    ancova, regression
    • Replies: 1
    • Views: 2,029
    06-08-2016, 02:46 PM Go to last post
  15. Mean/St.dev analysis

    Hello everyone, a pleasure for me to write in the community I'm currently looking to understand whether it sounds statistically correct the...

    Started by Talalapunzicher‎, 05-17-2016 04:25 PM
    • Replies: 1
    • Views: 1,789
    06-07-2016, 10:58 AM Go to last post
  16. I'm getting an asterik for p-value in minitab when I try to do a two-way ANOVA. Help

    I am trying to do a Two-Way ANOVA. I did what i think I need to do to have the p-value show up on the screen (after i click the button that starts...

    Started by ybekele‎, 06-06-2016 06:16 PM
    • Replies: 1
    • Views: 1,980
    06-07-2016, 06:30 AM Go to last post
  17. Thumbs up Newbie ...stats analysis of research survey using excel

    I am doing my Masters having not done any stats for 34 years , so I would like your help I have undertaken by survey , I have codified by data...

    Started by Epy‎, 06-07-2016 02:52 AM
    • Replies: 1
    • Views: 1,507
    06-07-2016, 04:34 AM Go to last post
  18. Correlation scenario

    Hi all I have a situation where I attempted to correlate the difference between mean pre and post exam scores to study time in a sample of around...

    Started by Darkest Horse‎, 06-06-2016 03:59 PM
    • Replies: 0
    • Views: 2,255
    06-06-2016, 03:59 PM Go to last post
  19. Is it possible to complete repeated measures Anova?

    I'm measuring 6 different factors 7 times. So in total I have 42 items - 6 times 1- factor; 6 times 2nd factor; 6 times 3rd factor; 6 times 4th...

    Started by Zhanna‎, 06-06-2016 02:26 PM
    • Replies: 0
    • Views: 1,060
    06-06-2016, 02:26 PM Go to last post
  20. are these samples independent?

    Sample 1 was selected to represent a population in 1 year. Sample 2 was selected to represent the same population in another year. Different...

    Started by stat_analyst‎, 06-06-2016 12:24 PM
    • Replies: 0
    • Views: 675
    06-06-2016, 12:24 PM Go to last post
  21. Discuss the implications of equal variance

    Part d) asks me to discuss the implications of part c). I conducted an f test of equal variances and I did not reject the null hypothesis.I stated...

    Started by k.dot‎, 06-05-2016 11:35 PM
    • Replies: 0
    • Views: 935
    06-05-2016, 11:35 PM Go to last post
  22. Logistic regression - how do I interpret Odds ratio & how do I explain a very high OR

    Hello, As part of my doctoral thesis I have completed a logistic regression to assess the impact of some parenting variables on recovery from a...

    Started by sallyr‎, 06-04-2016 04:32 AM
    • Replies: 5
    • Views: 1,324
    06-05-2016, 11:39 AM Go to last post
  23. Simple "controlling for population size difference" question

    Hello, I just had a ludicrous argument with a friend that we would like your help on settling. Let's assume the following: California...

    Started by feignfeign‎, 06-03-2016 12:03 PM
    • Replies: 2
    • Views: 1,268
    06-04-2016, 12:19 AM Go to last post
  24. Interpretation of a 2-way-interaction in the presence of a 3-way-interaction?

    Dear all, I have a question my Prof also has problems with and I canít find any answer in the web. Maybe I find somebody here who can help: I run...

    Started by Fred.‎, 06-03-2016 06:35 AM
    • Replies: 0
    • Views: 1,306
    06-03-2016, 06:35 AM Go to last post
  25. Is this moderation?

    I have been given an assignment to explore condom use (DV). The other variables are gender and fear of acquiring an STD. The literature review...

    Started by ChrisStudent‎, 06-01-2016 03:43 AM
    • Replies: 3
    • Views: 2,008
    06-03-2016, 04:58 AM Go to last post
  26. A question about data scales

    Hey everyone, So for a project I am supposed to decide on the most appropriate statistical analysis to investigate the relationship between the...

    Started by Fatkid53‎, 06-02-2016 11:56 AM
    • Replies: 0
    • Views: 1,047
    06-02-2016, 11:56 AM Go to last post
  27. Question How to show the MLE is weak consistent?

    Consider the model: Yt=at/T+et, t=0,...,T-1 e0,...,eT-1 be iid N(o,σ2) θ=' both...

    Started by moonscorpio‎, 06-02-2016 01:25 AM
    • Replies: 0
    • Views: 1,568
    06-02-2016, 01:25 AM Go to last post
  28. P value from SD

    Hello, I am a beginner at statistics. May you explain me following?I am doing a small lab report assignment. I have two groups ( number of 13, the...

    Started by weithet‎, 06-01-2016 11:18 PM
    • Replies: 0
    • Views: 1,424
    06-01-2016, 11:18 PM Go to last post
  29. SAS University Edition - Feedback request

    Has anyone used the SAS University Edition? I've used the full SAS 9.3 on Windows before but I'm switching to a Mac and have been told that the full...

    Started by StatsClue‎, 05-30-2016 12:21 PM
    • Replies: 3
    • Views: 1,415
    06-01-2016, 09:11 PM Go to last post
  30. Exclamation Chi-Square vs t-test

    Help! I am trying to compare observed education levels of a visiting group to the expected (known) education levels of the nation. These are...

    Started by mcverbeke‎, 06-01-2016 04:02 PM
    chi-square, cramer's v, t-test
    • Replies: 0
    • Views: 715
    06-01-2016, 04:02 PM Go to last post
  31. What formula do I use?

    During the past year, on the average 289 books were checked out daily from the public library. This year, the library has attempted to increase...

    Started by Natebomb321‎, 06-01-2016 02:44 PM
    • Replies: 1
    • Views: 1,414
    06-01-2016, 03:50 PM Go to last post
  32. Reduce Common Method Bias

    Hi Folks, I have a question regarding my research. I am looking into the behavior/personality of CEO on the firms general Behavior. My theory in...

    Started by Erasmus‎, 06-01-2016 05:38 AM
    bias, common method bias, multiple source, single source
    • Replies: 0
    • Views: 1,457
    06-01-2016, 05:38 AM Go to last post
  33. Does all variabler in a VAR/VEC need to be normally distributed?

    Well? Does all variables in a VAR/VEC need to be normally distributed, or only the target variable? It is very hard to get all of them to meet...

    Started by Lars001‎, 05-30-2016 04:00 PM
    cointegration, var, vecm
    • Replies: 0
    • Views: 1,229
    05-30-2016, 04:00 PM Go to last post
  34. Can a cointegrated variable be exogenous in first difference in a VEC model?

    If I have a variable C that is cointegrated with both variables A and B separately, can I use it in first-differenced form as an exogenous variable...

    Started by Lars001‎, 05-30-2016 03:57 PM
    cointegration, var, vecm
    • Replies: 0
    • Views: 974
    05-30-2016, 03:57 PM Go to last post
  35. predicting a rv based on past time series results

    Hi all, I have 3 previous years data (ie 3 time series) going from 05/05 may 05 - august 25 , the curve for the current year has data plotted...

    Started by merrittr‎, 05-30-2016 10:09 AM
    projection, regression, time series
    • Replies: 0
    • Views: 2,010
    05-30-2016, 10:09 AM Go to last post
  36. Multivariate logistic regression - weighted or unweighted data

    Hello everyone, I want to calculate a multivariate logistic regression. All the independent variables are also dummy-coded. There is also a...

    Started by oschl‎, 05-30-2016 03:58 AM
    • Replies: 2
    • Views: 1,512
    05-30-2016, 09:02 AM Go to last post
  37. Post ANOCOVA or Gain score?

    Hi everyone, I'm a newbie Ph.D. student and encountering an issue regarding which analysis to use for my study. Please help me out if you have...

    Started by mrsi‎, 05-27-2016 02:04 PM
    • Replies: 5
    • Views: 2,811
    05-29-2016, 06:08 AM Go to last post
  38. Post One Sample T-Test Issue

    Dear members, I have an issue regarding the analysis of one sample n = 100 consisting of two groups (50 customers and 50 people who are not...

    Started by RSV2‎, 05-28-2016 03:10 PM
    • Replies: 0
    • Views: 1,122
    05-28-2016, 03:10 PM Go to last post
  39. Randomness testing using frequency within a block method, chi-square statistic doubt.

    The chi-squared statistic under the frequency within a block method is defined as 4M summation of (proportion of 1s in block - 0.5 ) ^2 where M is...

    Started by sshresth12‎, 05-27-2016 09:53 AM
    chi square test, cryptology, randomness, testing, testing of hypothesis
    • Replies: 0
    • Views: 934
    05-27-2016, 09:53 AM Go to last post
  40. Regression? or Time series analysis?

    Hi, this is my first time posting. I am trying to prove a point- but it's been a while since I've dabled in statistics. My null hipotesis is...

    Started by Oliva‎, 05-25-2016 05:58 AM
    • Replies: 2
    • Views: 1,105
    05-27-2016, 08:51 AM Go to last post
  41. Iterated variance problem

    I've never posted here before, so I apologize in advance for anything I might do that is not according to forum standards or just plain wrong. ...

    Started by jossan‎, 05-26-2016 04:50 PM
    • Replies: 2
    • Views: 1,566
    05-27-2016, 02:19 AM Go to last post
  42. Justification of standard error for correlation coefficient with small sample size

    Explaining Psychological Statistics, 4th Edition gives the standard error of the correlation coefficient for sample sizes that are "not large"...

    Started by Menz Agitat‎, 05-26-2016 05:18 PM
    • Replies: 0
    • Views: 991
    05-26-2016, 05:18 PM Go to last post
  43. inter and intra rater reliability

    I am doing a reliability study during which we had 2 individuals take 6 different measurements using a custom tool. Each of the 6 measurements was...

    Started by mac101‎, 05-26-2016 04:50 PM
    reliability analysis
    • Replies: 0
    • Views: 998
    05-26-2016, 04:50 PM Go to last post
  44. Thumbs up Which test to use in SPSS? Would be great if you could help! :wave:

    Hi guys, I am writing my thesis at the moment but I'm kinda stuck. I have two main questions: - My independent variable is nominal (dummy...

    Started by Thijsnld‎, 05-26-2016 06:20 AM
    bless you, spss, thesis
    • Replies: 0
    • Views: 893
    05-26-2016, 06:20 AM Go to last post
  45. Reliability in health and disease (ICC,CoV) - Separtely or combined

    I am currently writing an article. However, I have a concern regarding my statistics part. I calculated the ICC (Intraclass correlation) and CoV...

    Started by martijnvanhooff‎, 05-26-2016 06:13 AM
    coefficient of variation, intraclass correlation, reliability analysis
    • Replies: 0
    • Views: 1,419
    05-26-2016, 06:13 AM Go to last post
  46. Restricted Maximum Likelihood (REML) Estimate of Variance Component.

    Let, \mathbf y_i = \mathbf X_i\mathbf\beta + \mathbf Z_i\mathbf b_i+ \mathbf\epsilon_i, where \mathbf y_i\sim N(\mathbf X_i\mathbf\beta,...

    Started by Cynderella‎, 05-25-2016 06:10 AM
    calculus, derivatives, longitudinal study, multivariate analysis, reml
    • Replies: 1
    • Views: 1,351
    05-25-2016, 10:59 PM Go to last post
  47. Post Starting to think my plan of analysis is not possible, please help!

    Thanks in advance for bearing with me: I have 120 participants, all randomly assigned to one of three conditions leaving 40 particpants in each...

    Started by marlot‎, 05-24-2016 03:58 PM
    • Replies: 0
    • Views: 1,207
    05-24-2016, 03:58 PM Go to last post
  48. Differentiation Involving Determinant.

    I have to compute the following differentiation : \frac{\partial}{\partial\sigma^2}\det, where \sigma^2 is a scalar, \det denotes determinant,...

    Started by Cynderella‎, 05-23-2016 12:41 AM
    calculus, derivatives, matrix multiplication, multivariate gaussian mle, reml
    • Replies: 0
    • Views: 1,137
    05-23-2016, 12:41 AM Go to last post
  49. Help on my masters thesis please!

    So i'm a dentistry student working on my masters thesis and i find myself needing some help on some statistical analysis. I'm (trying) to use SPSS...

    Started by xDafonso‎, 05-21-2016 06:31 PM
    • Replies: 5
    • Views: 2,102
    05-22-2016, 03:13 PM Go to last post
  50. Bayesian test with exponential density function.

    I need to do a bayesian test for a simple random sample with exponential distribution and N(2,3) as a prior distribution conditioned by: Null...

    Started by GeorgeFC‎, 05-22-2016 10:27 AM
    • Replies: 0
    • Views: 1,358
    05-22-2016, 10:27 AM Go to last post
  51. Using pooled data formula or not?

    The question is: Broken arms can be treated with surgery or splints. In a study with 200 patients, half had surgery and half used splints. In the...

    Started by polkadotti101‎, 05-22-2016 09:38 AM
    alpha, hypothesis, p value, pooled
    • Replies: 0
    • Views: 938
    05-22-2016, 09:38 AM Go to last post
  52. glm repeated measures

    Hello all, I am running a repeated measures analyses, with a continuous set of variables, but I want to compare between 4 groups (ordinal...

    Started by Hani Tamim‎, 05-21-2016 05:55 PM
    • Replies: 0
    • Views: 1,034
    05-21-2016, 05:55 PM Go to last post
  53. Comparison of two groups question

    Hi all. I think this is quite an elementary question, but I need a little bit of advice. I have some data on a workforce. For each member of the...

    Started by tonytheviking‎, 05-21-2016 06:29 AM
    • Replies: 3
    • Views: 1,676
    05-21-2016, 10:16 AM Go to last post
  54. one sample t test between percents

    if I have two percentages say 50% and 10% from a survey conducted with 20 people and there are 3 possible answers yes, no and don't know ...

    Started by freddywills‎, 05-21-2016 03:12 AM
    • Replies: 2
    • Views: 2,967
    05-21-2016, 05:33 AM Go to last post
  55. Showing Left Side to Right Side.

    Let \mathbf x is a (p\times 1) vector, \mathbf\mu_1 is a (p\times 1) vector, \mathbf\mu_2 is a (p\times 1) vector, and \Sigma is a (p\times p)...

    Started by Cynderella‎, 05-21-2016 12:48 AM
    bivariate gaussian, matrix algebra, multivariate analysis
    • Replies: 0
    • Views: 1,197
    05-21-2016, 12:48 AM Go to last post
  56. Analyse test for heteroskedasticity

    Hello I am working on a little statistic research and I am not sure how to interpret these datas. I have a multiple regression with 3 exogene...

    Started by Lord_Stark‎, 05-20-2016 01:47 AM
    • Replies: 0
    • Views: 1,074
    05-20-2016, 01:47 AM Go to last post
  57. Help on choosing what method!

    An experiment was done to look at the positive arousing effects

    Started by Paulducci‎, 05-18-2016 06:33 PM
    • Replies: 4
    • Views: 2,464
    05-20-2016, 12:54 AM Go to last post
  58. help with ACF and PACF

    Hi Guys, Can some one help with interpreting the ACF and PACF graph, I have run a multiple regression and suspect the errors are autoregressive. I...

    Started by mayccc‎, 05-18-2016 10:11 AM
    • Replies: 1
    • Views: 1,537
    05-18-2016, 12:05 PM Go to last post
  59. Find out significant variables

    Hi I have a data table consisting of normalized frequencies (out of 100) of certain linguistic features. Please see the sample below. There are...

    Started by true_friend‎, 05-16-2016 07:57 AM
    significant difference
    • Replies: 4
    • Views: 2,035
    05-18-2016, 03:52 AM Go to last post
  60. help on chi-square test

    Hi, can somone help me with doing a Chi-square test or Yates corrected chi-square test of the data file I have attached. I dont get it, or is the...

    Started by Anne3‎, 05-18-2016 03:06 AM
    • Replies: 0
    • Views: 1,154
    05-18-2016, 03:06 AM Go to last post

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