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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: 197,217
    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: 66,990
    09-30-2005, 09:44 AM Go to last post
  1. [ASK] Measures of Central Tendency in Symmetrical Distribution

    If a population's distributon is a symmetrical distribution, Does Mean, Median and Mode always has a same value? :confused: From what I know,...

    Started by StatCentre‎, 11-04-2010 07:51 AM
    • Replies: 1
    • Views: 3,551
    11-04-2010, 09:12 AM Go to last post
  2. [Basic Help] How to present statistical estimates like standard errors in general?

    Could anyone tell me how to present statistical estimates for qualitative data in general? The following sampled data are given with weighting...

    Started by tom2012‎, 07-15-2012 06:54 AM
    • Replies: 0
    • Views: 1,294
    07-15-2012, 06:54 AM Go to last post
  3. [Checking/Help] Hypothesis Testing and Chi-squared Test

    Hi there, I have two questions that need to be submitted online, and was hoping someone could check my answers before I submit them. Question 1...

    Started by TaylorC‎, 12-07-2014 09:57 AM
    • Replies: 13
    • Views: 1,886
    12-11-2014, 05:31 AM Go to last post
  4. [chi-square test] Should I use a chi-square test or other test?

    Hello guys, I'm analyzing the question: "Is Age a factor that influences having high blood pressure?" The survey was divided to age...

    Started by GerPro‎, 09-19-2015 04:37 AM
    • Replies: 0
    • Views: 1,029
    09-19-2015, 04:37 AM Go to last post
  5. [chi-square test] Should I use a chi-square test or other test?

    Hello guys, I'm analyzing the question: "Is Age a factor that influences having high blood pressure?" The survey was divided to age...

    Started by GerPro‎, 09-19-2015 05:11 AM
    • Replies: 2
    • Views: 1,253
    09-19-2015, 03:21 PM Go to last post
  6. Question [Conjoint Analysis] Measuring (cognitive) cost functions instead of value functions?

    Hello :wave:, usually one uses Conjoint Analysis, like in my case ACBC (Adaptive Choice Based Conjoint) in order to measure preferences and...

    Started by Conjoint Chirs‎, 11-06-2016 04:58 AM
    cbc / acbc, conjoint, conjoint analysis, consumer test, cost estimation
    • Replies: 0
    • Views: 1,385
    11-06-2016, 04:58 AM Go to last post
  7. [Correlation Analysis] Information on entering and analyzing Likert-scale data

    Hi, I am a Psychology student seeking advice for using SPSS (version 21). My research question is whether personality traits (extravertedness,...

    Started by plamiv‎, 11-29-2014 04:21 PM
    correlation analysis, data entry, spss, spss 21, spss statistics
    • Replies: 4
    • Views: 1,882
    12-02-2014, 09:51 AM Go to last post
  8. [Diffiult problems] Extract meaningful information from a data set

    This is a project for 10 minutes presentation and we need to find meaningful information from the data set shown as follows, ...

    Started by yauo1215‎, 11-29-2010 04:39 AM
    • Replies: 6
    • Views: 3,638
    11-30-2010, 09:51 PM Go to last post
    • Replies: 1
    • Views: 2,119
    11-07-2013, 12:13 AM Go to last post
  9. [Excel/SPSS] - How to compare group homogeneity (2 variables)

    Hey dear forum members, it's my first time here, so a big hello to everyone reading this. First of all, I hope my headline gave you a clear idea...

    Started by sammelkorn‎, 01-21-2016 06:17 AM
    homogeneity tests, linguistics, two variables
    • Replies: 5
    • Views: 1,264
    01-27-2016, 05:16 AM Go to last post
  10. [Excel] How to keep track of metrics

    I have a data table with 3 Columns that I want to be able to measure the performance for. Ex. Number| Stage | Date/time 111111 ...

    Started by chillzen‎, 07-01-2015 02:10 PM
    data analysis, excel, metrics
    • Replies: 2
    • Views: 2,713
    07-01-2015, 03:23 PM Go to last post
  11. [Excel]Coming up with prime numbers

    Hi guys, So I have two sets of data. Group A and Group B, 35 subjects in each group. I want to generate another set of data based on data in...

    Started by newforumen‎, 09-15-2011 05:50 PM
    • Replies: 2
    • Views: 2,580
    09-15-2011, 06:11 PM Go to last post
  12. [FactorialANOVA] Which N to use when converting standard error to standard deviation?

    When converting standard error to standard deviation (using the formula SD = SE x SRT of N), I am having trouble with is which N to use - the N of...

    Started by sarahw5‎, 02-16-2016 08:54 AM
    standard deviation, standard error
    • Replies: 1
    • Views: 897
    02-17-2016, 05:30 AM Go to last post
  13. [HELP Self-learning] When use Z distribution and When T?

    I really think Stats is not for dump gal like me... Finally I get some questions to test my understanding. Can some gurus see if I applied Z / T...

    Started by dauphin‎, 11-04-2010 11:07 AM
    • Replies: 11
    • Views: 3,858
    11-04-2010, 07:30 PM Go to last post
  14. [SOLVED] [HELP] i need help with them plz

    19. The weights of cats are normally distributed with a known standard deviation of 2 lb. If we take a sample of 64 cats and get a sample mean...

    Started by filmi‎, 12-23-2011 06:28 PM
    • Replies: 8
    • Views: 2,427
    12-24-2011, 10:48 AM Go to last post
  15. [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: 2,634
    11-27-2013, 12:41 AM Go to last post
  16. [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: 1,905
    11-14-2013, 06:47 PM Go to last post
  17. [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: 809
    05-13-2014, 11:09 PM Go to last post
  18. [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: 2,975
    10-26-2010, 04:03 PM Go to last post
  19. [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: 1,515
    08-27-2014, 10:35 AM Go to last post
  20. [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: 1,346
    12-09-2011, 10:52 PM Go to last post
  21. [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
    interaction
    • Replies: 0
    • Views: 1,371
    05-29-2012, 11:06 AM Go to last post
  22. [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: 2,113
    02-24-2013, 05:21 PM Go to last post
  23. [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: 1,714
    06-05-2014, 02:23 AM Go to last post
  24. [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: 3,079
    09-06-2012, 05:31 PM Go to last post
  25. [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: 1,099
    03-17-2015, 10:42 AM Go to last post
  26. [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: 2,856
    08-26-2014, 12:36 AM Go to last post
  27. [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: 9,302
    03-10-2011, 12:33 PM Go to last post
  28. [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: 2,821
    09-22-2009, 09:18 AM Go to last post
  29. [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: 3,246
    02-18-2011, 12:43 PM Go to last post
  30. [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: 1,266
    06-07-2013, 07:15 AM Go to last post
  31. [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: 1,790
    05-10-2013, 02:37 AM Go to last post
  32. [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: 1,584
    11-28-2013, 10:02 AM Go to last post
  33. [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: 4,893
    12-07-2011, 02:50 AM Go to last post
  34. [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: 1,353
    11-22-2014, 09:43 PM Go to last post
  35. [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: 1,522
    12-07-2011, 02:06 AM Go to last post
  36. [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: 2,229
    08-28-2015, 08:49 AM Go to last post
  37. 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: 2,082
    09-22-2007, 01:59 PM Go to last post
  38. [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: 3,014
    11-14-2010, 09:02 PM Go to last post
  39. [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: 1,325
    05-16-2013, 09:42 AM Go to last post
  40. 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: 1,672
    10-01-2014, 06:35 AM Go to last post
  41. [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: 5,118
    04-13-2014, 04:56 AM Go to last post
  42. [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
    dependent
    • Replies: 8
    • Views: 1,473
    09-25-2012, 08:26 PM Go to last post
  43. [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: 972
    11-15-2013, 09:10 AM Go to last post
  44. [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: 1,846
    06-23-2013, 10:58 AM Go to last post
  45. [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: 829
    07-01-2014, 03:12 AM Go to last post
  46. [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: 1,361
    05-22-2015, 10:34 PM Go to last post
  47. [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: 1,015
    06-01-2015, 08:46 AM Go to last post
  48. [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: 5,629
    10-27-2010, 11:05 PM Go to last post
  49. [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
    sampling
    • Replies: 4
    • Views: 1,197
    04-11-2017, 11:42 AM Go to last post
  50. [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: 4,308
    06-22-2010, 01:11 PM Go to last post
  51. 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: 2,839
    10-21-2011, 10:11 PM Go to last post
  52. [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: 23,808
    01-09-2011, 03:48 PM Go to last post
  53. [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
    solved
    • Replies: 8
    • Views: 6,265
    01-09-2011, 08:55 PM Go to last post
  54. [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
    solved
    • Replies: 2
    • Views: 3,823
    01-06-2011, 03:38 AM Go to last post
  55. 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: 21,539
    02-26-2013, 01:38 AM Go to last post
  56. [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: 940
    05-16-2017, 06:18 PM Go to last post
  57. [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: 1,171
    01-10-2013, 11:54 AM Go to last post
  58. [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: 1,819
    11-18-2015, 02:42 PM Go to last post
  59. [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: 1,667
    09-22-2014, 05:35 AM Go to last post

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