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Forum: Statistics

Statistics course and homework discussion. Elementary statistics.

  1. 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: 66,744
    09-30-2005, 09:44 AM Go to last post
  2. 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: 196,737
    07-16-2014, 11:01 AM Go to last post
  1. {ask} how to find beta value for adaptive response rate exponential smothing ( ARRES

    hi im working on forecasting and time series i want to know how to find beta value for response rate exponential smothing ( ARRES ) by using solver...

    Started by harris‎, 10-20-2012 07:56 AM
    • Replies: 1
    • Views: 1,540
    01-18-2013, 10:03 AM Go to last post
  2. Unhappy [Z Scores] I am really confused

    Hey guys, nice to meet you, this is my first post. And I find out this forum because I have a question want to ask. I am reading a book called...

    Started by saxon‎, 07-09-2013 06:42 AM
    • Replies: 4
    • Views: 1,570
    07-09-2013, 10:08 PM Go to last post
  3. Lightbulb [XLSTAT] Get a special 15% discount as a Talkstats member!

    XLSTAT is pleased to offer TalkStats members exclusive rates on all orders placed online. Visit www.xlstat.com/en/order and enjoy a 15% discount on...

    Started by quark‎, 11-07-2012 10:53 PM
    • Replies: 1
    • Views: 6,716
    09-02-2013, 06:20 AM Go to last post
  4. Exclamation [URGENT] Prove Cox Snell residuals ~= exp(1)

    Hello all, While studying a past mid-term for a survival analysis course, I've come across a questions that troubled me so. The questions...

    Started by shary‎, 03-16-2014 04:34 PM
    • Replies: 0
    • Views: 1,244
    03-16-2014, 04:34 PM Go to last post
  5. [Students T Test] - paired or unpaired unequal variance?

    Hi, i have a question as to whether a paired test in this instance is appropriate. Scenario: an experimenter is testing a new treatment to see if...

    Started by bullsfever‎, 03-04-2012 06:54 AM
    paired t-test, students t test
    • Replies: 1
    • Views: 4,913
    03-04-2012, 07:37 PM Go to last post
  6. [Statistical Assumptions] Do elite samples violate assumptions?

    If you have millions of dollars, please respond. Thanks for your attention & feedback.

    Started by jimbrowsky‎, 12-10-2011 09:42 PM
    assumptions, design, independent measures, t test, violation
    • Replies: 1
    • Views: 2,445
    12-10-2011, 10:11 PM Go to last post
  7. [Stata] Selecting duplicate rows based on maximum column value

    Hi all, I'm currently working on my master thesis, and am trying to select data from a company database. However, in this database sometimes a...

    Started by Vugt‎, 11-02-2012 10:46 AM
    • Replies: 0
    • Views: 1,682
    11-02-2012, 10:46 AM Go to last post
  8. [Stata] How to Get the Beta Coefficient as a Variable using Stata

    After regressing by gvkey: lag1 lag2 I get 815 tables with a beta coefficient included. But I am only interested in getting these betas in a list...

    Started by Sicksty‎, 11-03-2013 01:22 PM
    • Replies: 0
    • Views: 2,313
    11-03-2013, 01:22 PM Go to last post
  9. [STATA - gsem] Multilevel Structural Equation Model - Meta Analysis

    Hello, I am quite familiar with mixed effects (multilevel models) in meta analyses. Now, I want to do a mixed effects (multilevel) meta...

    Started by Bavarian‎, 11-12-2016 07:26 AM
    meta-analysis, sem, stata
    • Replies: 1
    • Views: 1,289
    11-13-2016, 05:07 PM Go to last post
  10. Question [SPSS] Mixed Models - How To?

    Hi everybody, I've trying to understand how linear mixed models work within SPSS and how to set up my data to run through one. Ive read the...

    Started by ben504‎, 02-27-2012 05:36 PM
    how to, mixed models, spss
    • Replies: 3
    • Views: 7,425
    03-20-2012, 11:07 AM Go to last post
  11. [SPSS] Comparison to homogeneous distribution.

    Hello. This is my first post here, please forgive any mistakes. I am designing the statistics for a project. The aim is to compare samples...

    Started by Kututo‎, 04-11-2014 04:32 AM
    • Replies: 0
    • Views: 1,637
    04-11-2014, 04:32 AM Go to last post
  12. [SPSS] Comparing groups: variances are not equal

    Hi, I have a data set which is normally distributed but the variances are not equal. I did transformation but this not work. which kind of test I...

    Started by Aphid‎, 03-15-2015 04:59 AM
    • Replies: 3
    • Views: 1,667
    03-16-2015, 06:36 AM Go to last post
  13. [SPSS] comparing a value over time: how to analyze the trend?

    Hello everyone, I'm trying to understand how to analyze a trend in the correct way. I've seen a lot of videos/tutorials and read some books but I...

    Started by LittleJonckheere‎, 03-04-2016 12:14 PM
    • Replies: 2
    • Views: 1,706
    03-12-2016, 03:44 AM Go to last post
  14. [SPSS - wilcoxon/paired t test] - not normally distributed data

    Hello! I ran an analysis of my data of research into a repeated measures design and found the difference of both conditions to be not normally...

    Started by LoudWhisper‎, 11-27-2015 07:36 PM
    normal distributed, paired t-test, parametric, spps, wilcoxon
    • Replies: 4
    • Views: 3,154
    11-29-2015, 09:13 PM Go to last post
  15. [SPSS - T-Test] - understanding how to approach a question

    Hello, I have I inputted my data into SPSS. This is the question that I have been given: Compare the QABF attention(interval data)scores...

    Started by emilyrose‎, 03-04-2017 10:57 AM
    descriptive statistics, inferential statistics, spss, t-test, t-test two-sample
    • Replies: 1
    • Views: 1,112
    03-04-2017, 04:09 PM Go to last post
  16. [SPSS - nonparametric test] - which test should I use?

    Hello! I want to compare two groups: green-wearers versus orange-wearers (DV) I have 20 subjects: 10 wore green, the other 10 orange. One...

    Started by DIversity‎, 09-22-2014 05:35 AM
    • Replies: 0
    • Views: 1,660
    09-22-2014, 05:35 AM Go to last post
  17. [SPSS - Kaplan-Meier] show curves for all patients AND subgroups

    In SPSS, is it possible to add the curve for all patients to a Kaplan-Meier plot which displays two subgroups? Another question: is there a...

    Started by cp44‎, 11-18-2015 02:42 PM
    • Replies: 0
    • Views: 1,773
    11-18-2015, 02:42 PM Go to last post
  18. [SPSS - GLM-ANOVA] GLM-ANOVA an appropriate choice of statistics?

    Dear Community! I have two questions regarding the GLM-ANOVA and post hoc tests! 1 ) Is the GLM-ANOVA an appropriate choice of statistical...

    Started by gruvaeus‎, 01-10-2013 06:18 AM
    • Replies: 1
    • Views: 1,152
    01-10-2013, 11:54 AM Go to last post
  19. [SPSS - Correlation] Correlation between binary variables?

    Hi, I have a question about the limitation of a correlation. I'm using SPSS and have a lot of multiple choice questions with multiple answers...

    Started by Kyssi‎, 05-16-2017 02:46 AM
    • Replies: 2
    • Views: 903
    05-16-2017, 06:18 PM Go to last post
  20. Post [Sponsored]Statistical estimations with Finaquant Protos – free .net library with tab

    Hello all, We would like to introduce our non-commercial software for students and academic staff: finaquant® protos - free .net library with...

    Started by quark‎, 02-26-2013 01:38 AM
    • Replies: 0
    • Views: 21,526
    02-26-2013, 01:38 AM Go to last post
  21. [Solved] Use mean or not?

    Hi everbody, Here's probably a quite simple question but I just want to be sure before doing tests on it. I'm not sure if I have to take the...

    Started by smir‎, 01-05-2011 11:58 AM
    • Replies: 2
    • Views: 3,785
    01-06-2011, 03:38 AM Go to last post
  22. [Solved] Problem with regards to Poisson! Need some help.

    Provided information; No. of particles in sample / No. of samples 0 / 32 1 / 47 2 / 37 3 / 18 4 / 4 5 / 2

    Started by bkk‎, 01-08-2011 09:56 AM
    • Replies: 8
    • Views: 6,209
    01-09-2011, 08:55 PM Go to last post
  23. [Solved] How to graph a partial correlation?

    Hi everyone, I would like to be able to make a graph for a partial correlation. Of course, to do so, I'll need the new X and Y values. I used SPSS...

    Started by yonder24‎, 08-08-2010 08:50 PM
    • Replies: 5
    • Views: 23,667
    01-09-2011, 03:48 PM Go to last post
  24. Question [Solved] f(x) > 1 ???

    I'm using kernal desnity estimation for the first time. I plotted the density that I got using R's density() function and noticed that portions of...

    Started by advla‎, 10-15-2011 09:55 PM
    • Replies: 3
    • Views: 2,807
    10-21-2011, 10:11 PM Go to last post
  25. [Sincere] Likert Scale Problem

    Hi, I am not a statistics student nor do i understand what can i derive from SPSS. But.. i seriously require help and am sincerely requesting...

    Started by tobytoh‎, 06-22-2010 12:23 PM
    • Replies: 1
    • Views: 4,267
    06-22-2010, 01:11 PM Go to last post
  26. [Sampling] Which type of sampling to use in this case

    I would appreciate any help in this case took from a book (without answers and tips): Consider that a court wishes to evaluate the proportion of...

    Started by Ardêncio‎, 04-11-2017 09:01 AM
    • Replies: 4
    • Views: 1,162
    04-11-2017, 11:42 AM Go to last post
  27. [Sample Test Question] Generalized and Total Variance

    Here is a sample midterm question that the instructor provided: A colleague says that the "generalized variance", defined as the determinant of a...

    Started by LackingArtistry‎, 10-27-2010 11:05 PM
    • Replies: 0
    • Views: 5,564
    10-27-2010, 11:05 PM Go to last post
  28. [R] Prevalence by site. Stuck after fisher.test and pairwise.t.test

    Hi, I run into a problem I can't solve and I got stuck doing the pairwise.t.test. I'll try to give you as many details I could so maybe you can...

    Started by Saccharo‎, 06-01-2015 08:46 AM
    pairwise.t.test, percentage, prevalence, t-test
    • Replies: 0
    • Views: 1,011
    06-01-2015, 08:46 AM Go to last post
  29. [R] Nonparametric residuals for multiple regression. Timming, Bootstrapping, ranking?

    Hi, I’ve been looking through the forum and Google, but I can’t find the answer. I’ll post my problem here. I got a dependent variable...

    Started by Saccharo‎, 05-21-2015 03:24 PM
    • Replies: 6
    • Views: 1,354
    05-22-2015, 10:34 PM Go to last post
  30. [R] Methods to determine reliability of measurements using median and median absolute

    I have been looking for a solution to this problem for days, so I hope you can help me. I have several datasets containing hundreds of variables,...

    Started by erfem‎, 07-01-2014 03:12 AM
    dispersion, median absolute deviation, significance, test method, variability
    • Replies: 0
    • Views: 820
    07-01-2014, 03:12 AM Go to last post
  31. [response set analysis] respondents unaware of negative formulated items

    Hi I’m wondering what to do when negative items does not break response set. In other words, it remain unclear if respondent was where of the...

    Started by Patrick@RU‎, 06-23-2013 10:58 AM
    response set analysis
    • Replies: 0
    • Views: 1,828
    06-23-2013, 10:58 AM Go to last post
  32. [Reliability analysis\PCA] Calculate alpha for whole itemset or separate components?

    Hi. I'm writing a report for class and need some help at the moment. I am studying the halo effect, I created a survey for three groups, number of...

    Started by hugstari‎, 11-15-2013 09:10 AM
    • Replies: 0
    • Views: 962
    11-15-2013, 09:10 AM Go to last post
  33. [Relation of daily sales] Chi-Square, T-Test or Correlation?

    Hello, Which to use to test whether Monday sales and sales on the other days of the week are independent from each other. Case: A promotion...

    Started by kggunes‎, 09-13-2012 05:22 AM
    • Replies: 8
    • Views: 1,464
    09-25-2012, 08:26 PM Go to last post
  34. [R – lme function] Comparing curves in longitudinal data (growth curves)

    I think my problem is best solved by the use of multi-level models. However, I’d like to confirm if what I’m doing is right, and the use of the...

    Started by RodGob‎, 04-13-2014 04:56 AM
    • Replies: 0
    • Views: 5,090
    04-13-2014, 04:56 AM Go to last post
  35. Question [R statistics] Multiple combinations (in this case: drug-adverse reaction) with the s

    The title should have been: Multiple combinations (ex drug-ADR) with the same unique ID I am quite new to R statistics, and I one you can help me....

    Started by KatrineKrogh‎, 10-01-2014 06:35 AM
    • Replies: 0
    • Views: 1,655
    10-01-2014, 06:35 AM Go to last post
  36. [R - Wilcoxon] Appropriateness of Wilcoxon test for tox data?

    I have toxicity data (percent mortality) for a pesticide on a given organism. I want to compare the mortality at the end of 24 hr observation vs the...

    Started by selmagirl‎, 05-16-2013 09:42 AM
    • Replies: 0
    • Views: 1,316
    05-16-2013, 09:42 AM Go to last post
  37. [Q] Confidence interval

    If the question asks how to reduce the confidence interval to 0.2, does that mean zs/sqrt N = 0.1?

    Started by Chaste‎, 11-14-2010 10:31 AM
    • Replies: 4
    • Views: 2,982
    11-14-2010, 09:02 PM Go to last post
  38. Question [question] wich program to make basic analysis?

    Hi, my sister sell's cloths in internet, and she ask me if i can make a basic analysis of wich type of cloth she is selling better. some basic...

    Started by bazan‎, 09-22-2007 01:59 PM
    • Replies: 0
    • Views: 2,050
    09-22-2007, 01:59 PM Go to last post
  39. [Prism 5] Gather or Individual Analysis? ANOVA or Kruskal?

    To whom it may help: My research is on cellular/molecular responses after hormones farmacological administration and I'm not quite sure how to...

    Started by luiscls‎, 08-24-2015 08:35 AM
    3 samples, anova, kruskal-wallis, normality issue
    • Replies: 13
    • Views: 2,197
    08-28-2015, 08:49 AM Go to last post
  40. [Post Hoc Tukey Repeated-Measures T-Test] Interpreting results & Confidence intervals

    This has been solved using SPSS

    Started by jimbrowsky‎, 12-07-2011 02:06 AM
    apa, confidence intervals, post hoc test, t-test, tukey
    • Replies: 0
    • Views: 1,503
    12-07-2011, 02:06 AM Go to last post
  41. [Please help] Checking independence for normal variable by checking the covariance

    Hi everyone, I got a big problem with proving the lemma of checking independence for normal variable sample by merely checking the covariance, anyone...

    Started by bobbymistery‎, 11-22-2014 09:43 PM
    • Replies: 0
    • Views: 1,345
    11-22-2014, 09:43 PM Go to last post
  42. [Paired T-Test] Assumptions & Violations

    poor design methods

    Started by jimbrowsky‎, 12-06-2011 01:11 AM
    assumptions, confidence interval, correlation, paired t-test, t-test
    • Replies: 5
    • Views: 4,846
    12-07-2011, 02:50 AM Go to last post
  43. [P Value - SPSS] From PRE/POST groups with different sample sizes

    Hello, I'm trying to determine the impact of an NGO environmental education program in Costa Rica. In order to do that we want to determine the...

    Started by mfuentes‎, 11-27-2013 01:04 PM
    • Replies: 1
    • Views: 1,557
    11-28-2013, 10:02 AM Go to last post
  44. [Ordinary Least Squares Regression By Hand] Explanation help needed

    Hi, I'm working on a problem that requires doing OLS by hand. I have the answers but I'm trying to understand why it uses certain formulas, which...

    Started by ctfdacow‎, 05-09-2013 09:06 PM
    • Replies: 3
    • Views: 1,756
    05-10-2013, 02:37 AM Go to last post
  45. [non normal Multiple sample comparison] analysis and error bars for medians

    Dear all, Background: Treatment applied to 10 groups of different sizes. Each group treated with a different concentration. Groups 9 and 10 are...

    Started by mirror‎, 06-07-2013 07:15 AM
    • Replies: 0
    • Views: 1,254
    06-07-2013, 07:15 AM Go to last post
  46. [newbie statistics question] High School Homework

    Have no idea how to approach the question. I quit school long ago and all of a sudden my son asks me about this. Please help out! Let X and Y be...

    Started by elton.li‎, 02-17-2011 12:58 AM
    • Replies: 3
    • Views: 3,206
    02-18-2011, 12:43 PM Go to last post
  47. [need help] Transformation for skewed distribution

    I have 2 variables (n=5527). The 1st variable is positive skewed and the 2nd is negative skewed. I want to correlate those 2 variables. So the...

    Started by okeagung‎, 09-22-2009 09:18 AM
    • Replies: 0
    • Views: 2,785
    09-22-2009, 09:18 AM Go to last post
  48. [need help] example Variogram in excel

    Hi All ! im newbie here ^^ I need example of creating variogram in excel.. Any help is very welcome. Thanking in advance. Kind regards,...

    Started by erikyoga‎, 03-10-2011 08:49 AM
    • Replies: 1
    • Views: 9,241
    03-10-2011, 12:33 PM Go to last post
  49. [Multivariate analysis] MANOVA vs PCA vs LDA

    Hi I have a little trouble deciding which test I use best for my data and was hoping you could help me a bit. I have four different classes of...

    Started by tateblack‎, 08-26-2014 12:36 AM
    • Replies: 0
    • Views: 2,816
    08-26-2014, 12:36 AM Go to last post
  50. [Multivariate analysis] Interest in each response variable separately

    Hei everyone I have a fully crossed experiment with three factors (Season, Infection, Starvation) and for each combination I measure gene...

    Started by tateblack‎, 03-17-2015 10:42 AM
    • Replies: 0
    • Views: 1,087
    03-17-2015, 10:42 AM Go to last post
  51. [Minitab] Sample size for nonparametric distributions

    I have 4 years of atmospheric monitoring data which is lognormally distributed. I have run Kruskall-Wallis test on the data and established there is...

    Started by peterk‎, 09-06-2012 03:37 PM
    • Replies: 2
    • Views: 3,049
    09-06-2012, 05:31 PM Go to last post
  52. [Meta-data analysis] Combining multiple correlations and p-values

    Hi all, I have 4 correlation values (pearson's correlation coefficient) and their p-values from 4 identical experiments (just different subjects...

    Started by glowfish‎, 06-05-2014 02:23 AM
    • Replies: 0
    • Views: 1,693
    06-05-2014, 02:23 AM Go to last post
  53. [JMP] Which test should I use? Comparing the fit between nominal variables

    Hello, I have a data set of 136 participants. Each participant completed a drawing and a story. The drawings and stories are each rated twice, as...

    Started by Gaelan‎, 02-23-2013 04:18 PM
    • Replies: 2
    • Views: 2,081
    02-24-2013, 05:21 PM Go to last post
  54. [interaction] link, anova

    Hello, Two things: (1) I will be happy if someone could refer me to a link whether it is explained what an interaction is. (2) I was...

    Started by collegeblock‎, 05-29-2012 11:06 AM
    • Replies: 0
    • Views: 1,363
    05-29-2012, 11:06 AM Go to last post
  55. [Independent and Repeated T Tests] Choosing Best Design Methods

    No feedback. Problem solved.

    Started by jimbrowsky‎, 12-09-2011 10:52 PM
    anova, pearson, regression, spearman, t test
    • Replies: 0
    • Views: 1,324
    12-09-2011, 10:52 PM Go to last post
  56. [HOMEWORK-USING R] Poisson Model using likelihood

    Question :A well-known example involving the Poisson model was described by LJ Bortkiewickz (1868-1931). The data refer to the annual number of...

    Started by rantree‎, 08-26-2014 05:34 PM
    likelihood, poisson
    • Replies: 4
    • Views: 1,506
    08-27-2014, 10:35 AM Go to last post
  57. [Homework Question] Canonical Correlations (Dason)

    This question appeared in my homework assignment. It comes from pg. 567 of Johnson & Wichern's Applied Multivariate Statistical Analysis (6th...

    Started by LackingArtistry‎, 10-26-2010 03:53 PM
    • Replies: 1
    • Views: 2,946
    10-26-2010, 04:03 PM Go to last post
  58. [help]interpretation needed please can please solve all parts please...

    The given model is from Merrill and fox. The data are presented (table 3.1) are presented for demand and supply of meat in the united states for...

    Started by numerospy‎, 05-13-2014 11:09 PM
    • Replies: 0
    • Views: 796
    05-13-2014, 11:09 PM Go to last post
  59. [help] regression hypothesis model help needed

    thank you so much everyone i solve this question :) now not sure its completly solved but i solved it by my self thank s again to all

    Started by numerospy‎, 11-12-2013 10:39 PM
    • Replies: 11
    • Views: 1,888
    11-14-2013, 06:47 PM Go to last post
  60. [help] jackknife estimater how do i calculate ?

    how do we calculate jackknife estimater of v(x)= p(1-p) and show that it is unbiased i dont know steps of jackknife estimater calculater but i...

    Started by numerospy‎, 11-24-2013 10:30 PM
    • Replies: 12
    • Views: 2,614
    11-27-2013, 12:41 AM Go to last post

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