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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: 197,007
    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: 66,879
    09-30-2005, 09:44 AM Go to last post
  1. Regression analysis with a proportion for the dependent variable

    Hi, i want to run a regression analysis for some data I have. The dependent variable is a proportion, and the independent variables are all...

    Started by Imicola‎, 02-06-2008 07:07 AM
    • Replies: 9
    • Views: 33,199
    04-30-2012, 04:05 AM Go to last post
  2. List of recommended stats books

    Stats novice here but enthusiast. What would be a list of books you would expect any BS in statistics to have. I have my list culled from uiuc's...

    Started by tigerstripedcat‎, 01-12-2011 08:10 PM
    books
    • Replies: 9
    • Views: 12,409
    01-16-2012, 02:10 PM Go to last post
  3. what shall I learn in order to understand logit models?

    Hello, I am an accounting student. i only did a unit in statistics covering basic topics such as basic probability, discrete probability...

    Started by t.wang21@yahoo.com.au‎, 07-17-2011 08:06 PM
    • Replies: 9
    • Views: 4,144
    07-19-2011, 02:54 AM Go to last post
  4. Simpson's diversity index - comparing 2 sites

    I need to compare the Simpson's Diveristy Index of 2 sites. For each site I have collected beetles using pitfall traps - 20 traps per site. Using...

    Started by Entomologist‎, 07-20-2011 02:11 PM
    simpson's diversity index
    • Replies: 9
    • Views: 18,489
    07-21-2011, 12:47 AM Go to last post
  5. Test for multiple means in a dataset

    In a dataset of arbitrary size what type of test could I apply to say with confidence that there are actually multiple smaller datasets present? ...

    Started by astickel‎, 07-27-2011 05:14 PM
    • Replies: 9
    • Views: 4,386
    08-01-2011, 06:00 PM Go to last post
  6. Seems simple but I don't remember how to solve?

    Given a normal distribution with a mean of 100 and a standard deviation of 10, what is the probability that X > 112?

    Started by Trying4MBA‎, 08-06-2011 10:55 PM
    • Replies: 9
    • Views: 3,446
    08-07-2011, 12:06 AM Go to last post
  7. Intepretation of regression estimates based on data from census

    I'm a bit curious about how to interpret confidence intervals of parameter estimates that comes from regression models (multiple regression and...

    Started by kabooze‎, 08-08-2011 01:08 AM
    • Replies: 9
    • Views: 6,718
    08-10-2011, 02:34 PM Go to last post
  8. Comments on Distribution of Data

    I would want to know how to give proper comments on the spread of data through the use of graph and frequency polygon. I have done some search before...

    Started by gwelsh‎, 08-25-2011 06:40 AM
    • Replies: 9
    • Views: 3,772
    09-01-2011, 05:55 PM Go to last post
  9. Real life question, probably very basic, but not sure where to start

    I'm working with some data sets ... let's call it variable "A", a lab result, vs time in days. I think A decreases with time, and would like to...

    Started by bymoor0‎, 09-06-2011 03:46 PM
    • Replies: 9
    • Views: 2,007
    09-08-2011, 02:05 PM Go to last post
  10. Pretest-Posttest Data Analysis....Help needed urgently

    My research topic is based on comparison of the Effects of Traditional and Modern teaching techniques on Students’ Attitude and Achievement in...

    Started by indicastats‎, 09-20-2011 03:05 AM
    • Replies: 9
    • Views: 14,899
    10-11-2011, 10:43 AM Go to last post
  11. t-distibution simulation

    How might one calculate the probability P(X<=x) drawn from 10,000 t-random numbers? This may involve utilizing computing software, but I'm more...

    Started by revans.evans‎, 10-02-2011 10:47 AM
    • Replies: 9
    • Views: 2,683
    10-02-2011, 02:39 PM Go to last post
  12. Chi square help

    Hi I have a variable x which could have been given a value between 1 and 30 by 189 people. Running chi square suggests that the results are not due...

    Started by barnaby‎, 10-31-2011 11:00 AM
    • Replies: 9
    • Views: 4,271
    11-02-2011, 04:41 AM Go to last post
  13. estimating non-truncated parameters (source distribution) from truncated data

    Hi all, I have a question regarding ‘truncated’ data. Say, for example, I’m making buttons with a certain thickness, and the process gives a...

    Started by babucher‎, 10-21-2011 03:54 PM
    • Replies: 9
    • Views: 6,127
    11-16-2011, 02:35 PM Go to last post
  14. sample size unequal probabiity

    how do you decide what n should be for a survey with unequal probability selection if you specify a margin of error of 3 percent? im interested in...

    Started by interestednew‎, 12-02-2011 06:28 PM
    • Replies: 9
    • Views: 2,211
    12-03-2011, 03:42 AM Go to last post
  15. Please help with formulas. Presentation in two hours

    I don't know what formulas to use The Berkley Gift Shop wants to have their own credit card with the “Berkley GS” logo, the Manager, Mr. Tyler...

    Started by miushja‎, 12-06-2011 12:18 PM
    • Replies: 9
    • Views: 3,004
    12-06-2011, 02:04 PM Go to last post
  16. Sequential AIC model selection

    Hi there, when running a model selection using AIC, am I allowed to do sequential AIC model selections? Example: I have a dependent variable (X)...

    Started by Luke‎, 12-13-2011 03:13 PM
    • Replies: 9
    • Views: 6,848
    12-14-2011, 12:10 PM Go to last post
  17. Negative effect size?

    Hi, I calculated the effect size for the results of Mann-Whitney U tests but some of them are negative. I was double checking the formula and how...

    Started by statn00b‎, 12-15-2011 11:09 AM
    • Replies: 9
    • Views: 54,776
    12-15-2011, 02:15 PM Go to last post
  18. The importance of calculus and matrix/linear algebra in understanding statistics

    Hey all, I'm currently in a stats class that teaches the course (right now with a focus on correlation and linear regression) in a very...

    Started by Rhodo‎, 02-07-2012 09:35 PM
    • Replies: 9
    • Views: 8,044
    02-08-2012, 12:03 AM Go to last post
  19. One question reliability... have you ever heard of?

    Hi I know this may seems silly to ask about but I have to !! I want to know if there is something like checking the reliability of just one...

    Started by Mougino‎, 02-09-2012 05:17 PM
    • Replies: 9
    • Views: 2,693
    02-10-2012, 09:46 AM Go to last post
  20. Does having too many variables in a regression affect the R^2 result?

    Right now I have 1 variable that I need to predict the outcome of and 18 possible independent variables. When I ran the analysis, the R^2 value was...

    Started by david_q‎, 02-15-2012 07:31 AM
    • Replies: 9
    • Views: 9,235
    02-15-2012, 02:00 PM Go to last post
  21. principal component analysis

    Can anyone tell me how to calculate the correlation between two components? I really have no idea how! thx in advance.

    Started by derekb‎, 02-17-2012 11:56 PM
    • Replies: 9
    • Views: 2,124
    02-18-2012, 02:17 AM Go to last post
  22. Non-normality persisting after various transformations

    Hi, I am using SPSS18. I am comparing a psychological treatment (n=26) to a control (n=32), but at the moment I'm still doing data cleaning and...

    Started by Alice‎, 02-22-2012 06:34 PM
    • Replies: 9
    • Views: 2,413
    02-23-2012, 12:12 AM Go to last post
  23. Theory testing

    Hi guys (First Post, woop!) Im currently attempting to draft a PhD proposal investigating the role of optimism in Seligman's Well Being Theory but...

    Started by a.b.barker‎, 03-06-2012 12:10 PM
    • Replies: 9
    • Views: 1,877
    03-06-2012, 02:06 PM Go to last post
  24. Really Basic A level Statistics Test. (Multiple Choice)

    1) ‘Cluster sampling’ is a term given to one method of (a) Selecting random numbers using excel (b) Probabilistic sample selection...

    Started by Alice15492‎, 03-07-2012 04:27 PM
    a level, sampling, simple, statistics test
    • Replies: 9
    • Views: 6,345
    03-08-2012, 04:01 AM Go to last post
  25. How to check association between an interval variable & nominal variable?

    There is a collection of data of 2000 patients. I want to know the age of onset of Diabetes (an interval variable) has any relationship to the...

    Started by buddhika‎, 03-15-2012 04:35 PM
    interval data, nominal data, significance test
    • Replies: 9
    • Views: 7,334
    12-06-2012, 07:30 PM Go to last post
  26. Post Kmeans clustering

    Every time I run the same calculation with the same number of cluster setting, I got different members in the cluster. What is the most reasonable...

    Started by Mostimportant‎, 03-21-2012 06:54 AM
    kmeans
    • Replies: 9
    • Views: 2,417
    03-22-2012, 04:50 AM Go to last post
  27. single-case study

    Dear friends, I am running a single case study. I am collecting correct and incorrect responses on two similar tests in 3 moments in time. I would...

    Started by collegeblock‎, 05-02-2012 12:22 PM
    chi-square, mcnemar, methodology, single-case study
    • Replies: 9
    • Views: 4,110
    05-05-2012, 09:49 AM Go to last post
  28. Yes/No Questionnaire Analysis

    Hey all. I'm having issues trying to figure out how to record and analyze some data I've collected. Here's the short story: 8 kids took before and...

    Started by Akelly1‎, 05-06-2012 08:40 PM
    • Replies: 9
    • Views: 16,998
    05-08-2012, 05:36 PM Go to last post
  29. The wheat and chessboard problem

    So I'm watching the tv show Numbers and they ask a problem called the Wheat Chessboard Problem which basically says: (see this wiki link about...

    Started by trinker‎, 05-21-2012 12:36 AM
    • Replies: 9
    • Views: 5,933
    05-22-2012, 01:43 PM Go to last post
  30. normal distribution of residuals

    Hello, i have to normalize the residual but according to my original data, really i do not know what is the most suitable model (regression) I...

    Started by sihem‎, 05-21-2012 11:37 AM
    • Replies: 9
    • Views: 4,295
    05-22-2012, 10:32 AM Go to last post
  31. Qualitative understanding of Logistic Regression

    I've been thinking hard about logistic regression, and I'm having some difficulty with the notion of "odds ratio" here. For each factor, I get an...

    Started by SmoothJohn‎, 05-24-2012 10:09 AM
    • Replies: 9
    • Views: 1,687
    05-25-2012, 12:46 PM Go to last post
  32. Sample coefficient of correlation

    Okay, suppose that I have n pairs of (Xi,Yi) of random variables X and Y. Between these n pairs of values (Xi,Yi), I am given the information that...

    Started by babynutt‎, 08-07-2012 08:03 AM
    • Replies: 9
    • Views: 3,208
    08-07-2012, 11:56 AM Go to last post
  33. Correcting unbalanced design

    I have ten replicates (bird's nests) that I have observed and made counts of the food that is going into the nests using cctv cameras. Unfortunately...

    Started by JonnyB‎, 08-06-2012 10:49 AM
    • Replies: 9
    • Views: 2,614
    08-06-2012, 05:32 PM Go to last post
  34. Permanova with covariate

    Dear all, I have designed a permanova analysis with covariate. It is a 1factorial design 1 Factor: Site (6 levels). 1 Covariate (Algal...

    Started by alexthomaswolf‎, 08-19-2012 08:06 AM
    • Replies: 9
    • Views: 5,411
    08-22-2012, 04:23 PM Go to last post
  35. Question Help on results interpretation plz.

    Hi all So I finally found out how to do what I wanted in SPSS in terms of tests but now I just wanted to check I was interpreting the data...

    Started by Pippy‎, 08-22-2012 11:36 AM
    • Replies: 9
    • Views: 2,637
    08-23-2012, 05:45 AM Go to last post
  36. ANOVA terminology

    I am reviewing for comps and I am confused about the difference between a factorial and crossed design. In both cases they appear to have each level...

    Started by noetsi‎, 08-21-2012 10:31 AM
    • Replies: 9
    • Views: 1,437
    08-22-2012, 04:15 PM Go to last post
  37. 2 groups with ratio(s); How to test between-/within-group differences?

    Hi statistics community I am wondering if anyone could please give me advice on my rather simple (I assume) statistical problem. I am working...

    Started by ~Narayan~‎, 08-28-2012 04:51 AM
    between-group differences, ratio, within-group difference
    • Replies: 9
    • Views: 3,308
    08-31-2012, 02:38 PM Go to last post
  38. Sample Size.. to generalize sample out to the population

    Hi all, Here, I ask your advise to overcome this, currently, I am working on master research, the aim of the research is to study the users...

    Started by MKAMER‎, 08-28-2012 08:32 AM
    • Replies: 9
    • Views: 8,889
    08-29-2012, 12:53 AM Go to last post
  39. Regarding supremum

    Hi guys, I hope everyone's been doing well. I have a quick question. Figured someone could answer without much effort. I know that with...

    Started by Link‎, 09-27-2012 10:48 PM
    • Replies: 9
    • Views: 1,886
    09-28-2012, 12:45 AM Go to last post
  40. Skewness and non-normally distributed data - Question.

    Hello everyone, this is actually my first post as I have just discovered this amazing forum for talking about statistics. I've read through the...

    Started by PBnJams‎, 10-11-2012 08:43 PM
    • Replies: 9
    • Views: 4,148
    10-21-2012, 09:01 PM Go to last post
  41. Confusing Sampling Distribution Problem

    Ok, I was understanding how to work sampling distribution problems until I came to this one, and I cannot figure out how to do it for the life of me:...

    Started by MustainSally‎, 10-30-2012 11:35 PM
    probability, r code, sampling distribution
    • Replies: 9
    • Views: 5,204
    10-31-2012, 09:20 PM Go to last post
  42. Distributions of random variables

    I have been sweating over these problems for 4 hours - can someone please help? Let Z1,...,Zn be identically independently distributed ~N(0,1)...

    Started by marleygrace‎, 10-18-2012 12:45 PM
    • Replies: 9
    • Views: 1,884
    10-18-2012, 01:24 PM Go to last post
  43. not sure of statistical test, probably some kind of ANOVA

    Hi all, I am not sure how to proceed given my data. I would appreciate if anyone could suggest a design. I tested the acceleration responses...

    Started by selecttext‎, 11-27-2012 01:37 PM
    • Replies: 9
    • Views: 1,765
    11-27-2012, 09:23 PM Go to last post
  44. Show that a sample size is too small for reliable results?

    Hi, I have a simple question about sample sizes I was hoping someone could help me with: A test subject drinks from 4 different glasses of water...

    Started by Nimtrix‎, 11-21-2012 09:40 AM
    • Replies: 9
    • Views: 3,363
    11-21-2012, 02:05 PM Go to last post
  45. 4 continuous IVs predicting a single binary DV

    Like the title says... I have 4 continuous IVs, whose combined effects (i.e. interactions possible) should predict a binary DV (possible values 1...

    Started by fizix‎, 12-14-2012 02:04 PM
    binary dependent variable
    • Replies: 9
    • Views: 2,021
    12-14-2012, 07:44 PM Go to last post
  46. When is the distribution abnormal, judging from the mean, median and modus?

    I have a poll data table with which be filled with between two and six thousand entries (one entry contains some 30 data). It is a table in SQL, a...

    Started by FrankC‎, 04-29-2013 12:52 PM
    • Replies: 9
    • Views: 2,468
    05-02-2013, 05:30 AM Go to last post
  47. Chi-Square and Uniform distributions: Where are they prevalent?

    Hey all. I'm in a pinch on a study and am needing to track down a source which will help me to identify in what areas of research data are organized...

    Started by krytellan‎, 12-27-2012 11:27 AM
    • Replies: 9
    • Views: 3,381
    12-28-2012, 01:34 PM Go to last post
  48. Any suggestions?

    I am using Systat 13.1 to predict the influence of tobacco use on blood flow. Tobacco use is an independent binary variable (1,0, yes/no) and blood...

    Started by bgaynes‎, 12-26-2012 04:48 PM
    • Replies: 9
    • Views: 1,123
    12-31-2012, 03:23 PM Go to last post
  49. Thumbs up Comparing a list of values or mean to a predetermined value

    Hello all, I've been trying to figure this out all day but I am struggling. :( I have a number of temperature readings over a period of 21...

    Started by crispy‎, 02-27-2013 06:02 PM
    • Replies: 9
    • Views: 1,670
    03-02-2013, 07:10 PM Go to last post
  50. Hypothesis Test for a Population Proportion

    I just need a clarification on these 2. For the requirements. When it states it has to more than 2.1 percent we use that for the p, right? What...

    Started by PSG‎, 04-26-2013 04:52 PM
    • Replies: 9
    • Views: 1,427
    04-28-2013, 12:44 AM Go to last post
  51. Compare 2 lists for statistical significance , which test to select ?

    I have 2 lists, a list that bought books and a list of readers that read those books. The lists are not coming from the same population . So the...

    Started by tnaser‎, 12-29-2012 11:55 AM
    • Replies: 9
    • Views: 3,953
    01-02-2013, 09:16 AM Go to last post
  52. confused on which statistic test to use for a Questionnaire

    Hi I was wondering if any one could help me with which statistical test to use for my dissertation. Basically i have conducted a questionnaire using...

    Started by philfo‎, 03-21-2013 03:11 PM
    • Replies: 9
    • Views: 1,896
    04-04-2013, 04:10 AM Go to last post
  53. Unequal sample sizes?

    Hi, what do you have to consider when using unequal sample sizes? How does it differ from using equal sizes? As an example, I have Group 1:...

    Started by dannee_‎, 04-14-2013 03:59 AM
    • Replies: 9
    • Views: 4,886
    04-15-2013, 10:38 AM Go to last post
  54. Mann Whitney U - P Value of 0.0000

    Good Afternoon all, I am using a Mann Whitney U to compare two populations the data ranges from (-2 to 2). I have already done this on 4...

    Started by n1477‎, 05-09-2013 07:52 AM
    mann-whitney test, mann-whitney u, p value
    • Replies: 9
    • Views: 9,525
    05-11-2013, 02:33 PM Go to last post
  55. Sample Categorization?

    Hello, I was wondering if you any of you knew what the best method would be for dividing a large sample (approx 30000) into 'categories'. This is...

    Started by pottersj‎, 05-22-2013 12:35 PM
    • Replies: 9
    • Views: 1,500
    05-24-2013, 05:12 AM Go to last post
  56. Estimate the unknown parameters

    How we could estimate the parameters of non-linear combination of Normal Distribution Random Variables? Thank you

    Started by Ferra‎, 06-13-2013 08:10 PM
    • Replies: 9
    • Views: 1,799
    06-17-2013, 12:01 PM Go to last post
  57. Null Hypothesis Rules: Can no difference be the alternative hypothesis?

    For his dissertation a colleague has developed a software tool and has the expectation (hypothesis) that people can complete the task with the...

    Started by eholder‎, 06-18-2013 04:02 AM
    alternative hypothesis, null hypothesis, reject
    • Replies: 9
    • Views: 3,342
    06-19-2013, 09:30 AM Go to last post
  58. Interpreting sensitivity and specificity with corresponding PPV and NPV

    Hello, I have calculated sensitivities, specificities with pos and neg predictive values for different cutoff values of two biomarkers. What i...

    Started by amb_e‎, 08-15-2013 09:26 AM
    negative, positive, predictive value, sensitivity, specificity
    • Replies: 9
    • Views: 3,531
    08-15-2013, 02:43 PM Go to last post
  59. Simple Statistics question. Please help.

    Suppose you wish to test the following hypotheses: Ho: p <= 0.25 and Ha: p > 0.25. If the proportion observed in a random sample of 100 items...

    Started by mikey32230‎, 09-02-2013 10:50 PM
    • Replies: 9
    • Views: 2,693
    09-04-2013, 03:33 PM Go to last post
  60. Confidence level vs Confidence Interval

    I am getting really confused on the confidence level/confidence interval distinction. Most examples I see on the net pair off a 95% confidence...

    Started by aferim‎, 09-11-2013 04:53 PM
    • Replies: 9
    • Views: 4,502
    09-12-2013, 12:59 PM Go to last post

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