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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: 200,392
    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: 68,590
    09-30-2005, 09:44 AM Go to last post
  1. Covariance of Order Statistics from N(0,1) Distribution

    Hello, I am verifing an exact value of the 2nd moment E(R^2) of a sample range (R) from the standard normal distribution. To let you clearly know...

    Started by DHB10‎, 02-02-2012 10:33 PM
    5 Pages
    1 2 3 ... 5
    • Replies: 66
    • Views: 24,595
    02-24-2012, 09:56 AM Go to last post
  2. Bayesian Statistics Question

    My current state is that I am clueless and have no idea what to do with it. Could somebody provide me some knowledge of how to start with this?

    Started by MegaMan‎, 12-08-2011 06:22 PM
    4 Pages
    1 2 3 ... 4
    • Replies: 51
    • Views: 9,604
    12-12-2011, 11:49 AM Go to last post
  3. Likert Scale (1-5) statistical analysis

    Hi, I have done my search on this website and google and have found my statistical test to be either t-test or chi-square so I'd like you guys to...

    Started by farcus‎, 07-13-2012 09:22 PM
    4 Pages
    1 2 3 ... 4
    • Replies: 47
    • Views: 13,942
    07-23-2012, 07:29 PM Go to last post
  4. A fundamental question!

    First sorry for my first-grade English! If you are OK with it, please read on. Second, sorry that my question is so basic, but sometimes I see...

    Started by victorxstc‎, 10-30-2011 04:23 PM
    4 Pages
    1 2 3 ... 4
    • Replies: 45
    • Views: 15,035
    01-25-2012, 05:57 AM Go to last post
  5. Activity Budgets - testing for difference

    Hello All, Firstly, I apologise for posting yet again, but after some advice from the wonderful Ecologist he has advised me to be more precise in...

    Started by Dragonwalker‎, 12-12-2011 11:43 AM
    4 Pages
    1 2 3 ... 4
    • Replies: 45
    • Views: 13,652
    01-12-2012, 04:08 PM Go to last post
  6. Help...Quebec Separation? Oui ou Non

    Since the 1960s, there has been an ongoing campaign among Quebecers to separate from Canada and form an independent nation. Should Quebec separate,...

    Started by daniel7lu‎, 11-06-2009 05:55 PM
    3 Pages
    1 2 3
    • Replies: 44
    • Views: 17,204
    11-15-2009, 07:07 PM Go to last post
  7. Practical significance

    The difference between two mean values is 103 units p-value is 0.00001 at alpha=0.05 95% confidence interval is (50, 150) difference of 100 units...

    Started by _joey‎, 08-07-2012 06:58 AM
    3 Pages
    1 2 3
    • Replies: 41
    • Views: 12,391
    08-08-2012, 12:15 PM Go to last post
  8. Posterior Distribution

    Suppose I have X_{1}..X_{n} which are i.i.d as Bernoulli random variables with P(X_{i} = 1) = \frac{e^\theta}{1+e^\theta} and the prior is normal...

    Started by MrAnon9‎, 12-13-2011 01:37 PM
    3 Pages
    1 2 3
    • Replies: 37
    • Views: 6,857
    12-16-2011, 12:45 PM Go to last post
  9. How to Determine if 2 variables are dependent?

    I'm trying to figure out whether or not citation flow and trust flow are independent of each other (here is the article containing the data:...

    Started by janhen2‎, 07-23-2012 01:25 AM
    3 Pages
    1 2 3
    data, dependent, independant data, stat, statistics
    • Replies: 37
    • Views: 25,442
    07-31-2012, 05:46 PM Go to last post
  10. Pop corn vs Chocolate. Which statistical test?

    Hello all. I have a couple of questions regarding what statistical tests to use for a three-part problem. I would very much appreciate any help....

    Started by newbiestat‎, 12-28-2014 01:49 PM
    3 Pages
    1 2 3
    • Replies: 37
    • Views: 7,799
    01-01-2015, 02:57 PM Go to last post
  11. Wink $60 - tutor wanted

    $60 an hour. R code Logistic and Poisson Regression Central Limit Theorem ANOVA Single, two pop tests Simple and Multiple Linear Regression...

    Started by duval‎, 12-02-2011 04:14 PM
    3 Pages
    1 2 3
    • Replies: 36
    • Views: 8,823
    12-03-2011, 01:44 PM Go to last post
  12. Meanings of a set of data

    Hi, My name is ngungo, means innocent or ignorant, and I am new here. I am a retired Computer Process Control Engineer. I had few statistics...

    Started by ngungo‎, 06-01-2012 10:25 PM
    3 Pages
    1 2 3
    • Replies: 36
    • Views: 8,686
    07-10-2012, 07:11 PM Go to last post
  13. Please help? Complete novice

    Please can someone help me with my analysis of data in my Masters dissertation? I have conducted a quantitative self-questionnaire in my...

    Started by Leehud74‎, 08-10-2012 03:30 PM
    3 Pages
    1 2 3
    • Replies: 36
    • Views: 7,262
    08-14-2012, 07:27 PM Go to last post
  14. Statistics with R - absolute beginner

    Could any recommend where to start with learning R. Which websites/books/videos explain R in the simplest possible manner?

    Started by Layo909‎, 05-28-2011 03:13 AM
    3 Pages
    1 2 3
    • Replies: 35
    • Views: 10,222
    09-20-2011, 10:40 AM Go to last post
  15. Interaction effects, distributions not normal- is ANOVA justified??

    Hi! I have a 2*4*6 factorial design. the sample distributions in most cases are NOT normal (tested with Kolmogorov-Smirnof test). It is...

    Started by knedlica‎, 11-02-2012 07:20 AM
    3 Pages
    1 2 3
    • Replies: 35
    • Views: 7,650
    11-11-2012, 03:53 AM Go to last post
  16. [SOLVED] Distribution of the Sample Range

    Hello, I got an article that was written by an unknown author, which I downloded from the Internet. It looks like one part of a book. I have...

    Started by DHB10‎, 01-30-2012 10:34 AM
    3 Pages
    1 2 3
    • Replies: 32
    • Views: 7,827
    02-01-2012, 12:52 PM Go to last post
  17. Help with comprehending output from proc reg

    So I just ran my very first regression and the data output is pasted below (I've also attached the .txt file) ...

    Started by david_q‎, 02-11-2012 01:12 PM
    3 Pages
    1 2 3
    • Replies: 32
    • Views: 12,169
    02-13-2012, 02:11 PM Go to last post
  18. Logistic Regression - How to interpret a Exp(b)= 0

    Hi all, I'm working on a project and keep getting caught up with how to interpret my results. I've found lots of info on how to interpret...

    Started by jessireebob‎, 05-01-2013 12:16 PM
    3 Pages
    1 2 3
    • Replies: 32
    • Views: 27,987
    05-03-2013, 04:45 AM Go to last post
  19. 50$$$ to the person who can help me answer 3 questions.

    willing to paypal 50$$$ to the person who can help me answer 3 questions. :) 1, The mean weight of 9 randomly selected 5 years old boys babies...

    Started by karkid‎, 12-06-2011 01:12 PM
    3 Pages
    1 2 3
    • Replies: 31
    • Views: 8,159
    02-08-2012, 08:55 AM Go to last post
  20. Distribution of MLE

    Hey guys how are you? I have the following question: Let X1,X2,...,Xn be a random sample from a Pareto distribution having pdf f(x|b)=...

    Started by Darktranquillity‎, 10-26-2011 06:15 PM
    3 Pages
    1 2 3
    • Replies: 30
    • Views: 9,482
    10-30-2011, 04:53 PM Go to last post
  21. Logistic Regression

    Say that I have data on flour beetles, with different doses and the response being the probability of the beetle dying on day k, and the beetles are...

    Started by MrAnon9‎, 02-05-2012 01:40 PM
    2 Pages
    1 2
    • Replies: 29
    • Views: 6,145
    02-09-2012, 11:30 PM Go to last post
  22. Paper Helicopter Experiment Doubt

    I have to do a Statistics homework related to the “Paper Helicopter Experiment”. Well, one of the most problematic questions is the last one: ...

    Started by Badjoras‎, 04-03-2013 06:11 PM
    2 Pages
    1 2
    • Replies: 29
    • Views: 7,805
    04-19-2013, 07:17 PM Go to last post
  23. Finding the Sufficient Statistic of Weibull Distribution.

    So I have a Weibull Distribution with two parameters with the following pdf: f(x/\alpha,\beta) = \frac{\beta}{\alpha^\beta} x^{\beta-1} exp ...

    Started by MegaMan‎, 12-02-2011 01:20 PM
    2 Pages
    1 2
    • Replies: 28
    • Views: 18,203
    12-05-2011, 04:29 PM Go to last post
  24. Regression diagnostics with proc glm or proc reg

    I fit my model using 'proc glm' but now it seems that proc reg should be used for the diagnostics. So, do I need to fit the model all over again...

    Started by StatsClue‎, 02-06-2012 04:04 PM
    2 Pages
    1 2
    regression diagnostics
    • Replies: 28
    • Views: 18,109
    02-13-2012, 01:43 PM Go to last post
  25. parameter estimation based on observed survival probabilities

    Say 100 samples have been pulled from a Normal distribution with unknown mean and variance. All I know about the results are the following: • 23...

    Started by schleprock‎, 10-24-2014 04:38 PM
    2 Pages
    1 2
    maximum likelihood
    • Replies: 28
    • Views: 5,421
    10-28-2014, 04:39 PM Go to last post
  26. Correlational design using nominal/ordinal data

    I have a problem that I've been struggling with for some time now. I can't find a standard, non-parametric test that seems to deal with this type of...

    Started by Zenid‎, 01-28-2012 10:04 AM
    2 Pages
    1 2
    • Replies: 27
    • Views: 12,005
    02-03-2012, 08:30 AM Go to last post
  27. Unhappy Hypothesis-test: difference between paired means

    Dear All, I have a doubt about the theory of matched pair t-test. I have the difference between two means and I wanna do an hyphothesis-test...

    Started by solimyr‎, 07-05-2013 11:02 AM
    2 Pages
    1 2
    • Replies: 27
    • Views: 6,312
    07-13-2013, 05:54 AM Go to last post
  28. Help Please...

    I have my book which is sort of like Greek to me, but I have read the chapter several times, and tried to work some of the problems, but the examples...

    Started by Esadler38chick‎, 11-17-2005 07:49 PM
    2 Pages
    1 2
    • Replies: 26
    • Views: 10,709
    05-19-2008, 11:23 PM Go to last post
  29. Hypothesis Testing

    Need to know the test that will be performed on the following question: The data comprises hours devoted to patient care per week for...

    Started by thedeath‎, 11-04-2006 03:08 AM
    2 Pages
    1 2
    • Replies: 26
    • Views: 9,165
    12-13-2006, 03:39 AM Go to last post
  30. Consistent Estimators and Consistency in Mean Square

    Hello, I have an estimator \hat\theta = f(X) and I know that f(X) has two possible values under this probability function: P(f(X) = \theta /...

    Started by MrAnon9‎, 11-30-2011 08:24 PM
    2 Pages
    1 2
    • Replies: 26
    • Views: 7,827
    12-02-2011, 12:12 PM Go to last post
  31. Multiple samples of different size and not normally distributed: how to compare/sort?

    Dason, if you or anyone else try to change my posts again, I will sue you and this forum for calumny, because you are not authorized by law to...

    Started by MManuel‎, 08-21-2012 03:31 PM
    2 Pages
    1 2
    anova, pedagogics
    • Replies: 26
    • Views: 7,586
    08-27-2012, 09:22 AM Go to last post
  32. differences between frequencies

    Dear all, I'm trying to figure out how to best determine if there is a significant differences between how often a particular answer to a question...

    Started by poons‎, 08-30-2012 03:38 AM
    2 Pages
    1 2
    • Replies: 26
    • Views: 4,789
    09-12-2012, 03:41 AM Go to last post
  33. What type of distribution is this and am I being sensible?

    I have a computer model, which I need to run 3500 times with different input parameters. The model's accuracy depends on a constant, let's call it...

    Started by Kobye‎, 04-29-2014 07:34 PM
    2 Pages
    1 2
    • Replies: 26
    • Views: 5,316
    05-02-2014, 10:21 AM Go to last post
  34. How can I find out, if subscales are independent?

    I need to find out, if four subscales of a scale a independent from each other in my sample. A correlation with all four is a good start, so I did...

    Started by LtStarbuck‎, 04-14-2015 08:40 AM
    2 Pages
    1 2
    • Replies: 26
    • Views: 8,754
    05-06-2015, 10:44 AM Go to last post
  35. increasing the r squared

    i have ran a regression with 4 varibles 1 being independent. my rsqaured is 0.25 is there anyway i can increase this or is there a better statistic...

    Started by diesel20056‎, 12-19-2011 12:56 PM
    2 Pages
    1 2
    • Replies: 25
    • Views: 39,853
    12-20-2011, 12:33 PM Go to last post
  36. Cronbach Alpha vs Pearson r

    Hi all, this might sound like a completely amateurish question but...what is the practical difference between cronbach's alpha and the Pearson...

    Started by dgi‎, 06-06-2012 05:13 AM
    2 Pages
    1 2
    • Replies: 25
    • Views: 40,215
    01-25-2015, 05:51 AM Go to last post
  37. tests for normal data

    Hi, I posted some like my questions, but I didn't stay very clearly with my problem. I have some rows of data like 1 0 2 1 3 0 I need...

    Started by slavia‎, 04-28-2013 09:10 AM
    2 Pages
    1 2
    • Replies: 25
    • Views: 7,265
    05-07-2013, 10:27 AM Go to last post
  38. Question Data analysis - which test is best

    I would like to know which test would be appropriate for testing my hypothesis. I am doing a research project on parasitic infections in snail...

    Started by Justice!‎, 04-22-2013 08:20 AM
    2 Pages
    1 2
    • Replies: 25
    • Views: 4,561
    04-25-2013, 09:29 AM Go to last post
  39. What to do when the predictors are not what I expected (when the model is fine)?

    I would try to clarify the problem and then ask the questions. The problem (variable names are masked due to confidentiality): I ran a binary...

    Started by victorxstc‎, 02-05-2013 05:43 PM
    2 Pages
    1 2
    multicollinearity, objective, regression, subjective
    • Replies: 24
    • Views: 5,002
    02-12-2013, 11:16 AM Go to last post
  40. Comparing Fs

    Hi ya'll How do you compare Fs (or Ts)? I know how to compare r-values and r2 values - but what if I have two Fs? How do I know if one is sig...

    Started by Philyuko‎, 12-04-2008 07:16 AM
    2 Pages
    1 2
    • Replies: 23
    • Views: 6,820
    02-03-2009, 02:00 PM Go to last post
  41. New to stats. Need help.

    Alright this is a question from my stats class, I'm sure most will find it basic , however im not sure if i'm on the right track or completely off. ...

    Started by canadia‎, 09-19-2009 08:31 PM
    2 Pages
    1 2
    • Replies: 23
    • Views: 7,016
    09-26-2009, 02:19 PM Go to last post
  42. comparing the DEGREE of difference between data sets

    Hi all, I'm wondering if there is a way to assess the degree of difference between data sets. For instance, say I have 4 groups of proportions (or...

    Started by psylocat‎, 01-06-2011 03:11 AM
    2 Pages
    1 2
    dissimiliarity measure, nmds, solved
    • Replies: 23
    • Views: 12,879
    01-14-2011, 02:34 AM Go to last post
  43. Finding Standard Deviation

    Hello everyone. I am new here, so excuse me if I sound a little too noobish. I am currently faced with the current problem on my homework. It isn't...

    Started by PhatKroger10‎, 12-06-2011 12:05 AM
    2 Pages
    1 2
    • Replies: 23
    • Views: 12,542
    12-06-2011, 02:48 AM Go to last post
  44. tests of normality

    Hi. How can I test normality of data? Which is the best tests?

    Started by slavia‎, 04-16-2013 06:25 AM
    2 Pages
    1 2
    • Replies: 23
    • Views: 4,915
    04-18-2013, 02:40 AM Go to last post
  45. gamma-function

    gamma-function g(t) = ymax * t^(alpha) * exp( alpha * (1-t)) With known ymax and alpha, what is the maximum slope of g(t) (with t>0)?

    Started by pongtep‎, 05-22-2013 12:04 AM
    2 Pages
    1 2
    gamma function
    • Replies: 23
    • Views: 4,453
    05-28-2013, 02:20 PM Go to last post
  46. how do i approach this problem?

    how do i approach this problem? thanks in advance.

    Started by titanlord1‎, 03-26-2014 02:19 PM
    2 Pages
    1 2
    • Replies: 23
    • Views: 3,976
    03-31-2014, 08:37 AM Go to last post
  47. Is the dice normal?

    there are 2 dices in a box. one is normal, another is not normal. i select one, and throw 300 times, get the result as below: question: is that...

    Started by nicegirl‎, 09-29-2014 08:35 AM
    2 Pages
    1 2
    • Replies: 23
    • Views: 6,957
    10-06-2014, 06:19 AM Go to last post
  48. Sum of Squares help!

    My homework problem says: For the following summary statistics, find ∑X and SS (sum of squares) a. XBar = 25, s = 10, n = 11 So, I think...

    Started by JWade‎, 09-06-2015 12:44 PM
    2 Pages
    1 2
    sum of squares
    • Replies: 23
    • Views: 4,679
    09-07-2015, 08:37 PM Go to last post
  49. Multivariate Regression - I think!

    Hi, I'm performing a psychological study about gender differences in attraction. Participants select between a number of figures that vary in...

    Started by iporter‎, 02-10-2006 02:39 PM
    2 Pages
    1 2
    • Replies: 22
    • Views: 8,643
    03-03-2006, 12:28 PM Go to last post
  50. 4 groups test - is it possible?

    My problem - I have conducted an experiment which grows Water Cress in 6 different growing mediums (sand, gravel, stone, peat, compost,...

    Started by slippy‎, 02-22-2008 05:36 PM
    2 Pages
    1 2
    • Replies: 22
    • Views: 4,858
    03-10-2008, 11:31 AM Go to last post
  51. Question P value interpretation

    Hi , I am having a hard time understanding the concept of p value and also its interpretation. I know that I can interpret a p value of 0.80 as...

    Started by anushaka‎, 11-23-2011 08:24 AM
    2 Pages
    1 2
    • Replies: 22
    • Views: 40,883
    11-28-2011, 02:45 PM Go to last post
  52. Talking Hi! im looking for which advance data analysis is actually helpful to real life.

    Hi! I really really need real life examples of how and which advance data analysis you personally can use to help in your life. so no basic stuff...

    Started by datana6521‎, 02-16-2013 02:34 AM
    2 Pages
    1 2
    • Replies: 22
    • Views: 4,496
    02-17-2013, 12:36 AM Go to last post
  53. Prediciting accidents

    I have some data which measures the amount of hazard inspections completed in a workplace. I want to find whether there is a relationship between the...

    Started by TimA‎, 04-26-2014 05:33 PM
    2 Pages
    1 2
    • Replies: 22
    • Views: 3,749
    04-29-2014, 05:10 AM Go to last post
  54. Is it better if it isn't statistically significant?

    So I am having a discussion with a colleague about a paper that we are writing. We have some results that has 3 levels of 1 Factor (A, B, and C). ...

    Started by dalupus‎, 06-11-2015 09:03 AM
    2 Pages
    1 2
    • Replies: 22
    • Views: 5,217
    06-30-2015, 09:02 AM Go to last post
  55. Doubt on statistical test

    Hi, my perception test presents one stimulus at a time and the listener has to choose one from three possible answers. There are 5 stimuli...

    Started by sid2016‎, 08-09-2016 12:59 PM
    2 Pages
    1 2
    • Replies: 22
    • Views: 4,553
    08-25-2016, 04:12 PM Go to last post
  56. inferential statistics

    In a recent national survey, the mean weekly allowance for a nine year old child from his parents was reported to be 3.65. A random sample of 45 nine...

    Started by dbardy‎, 03-17-2008 06:54 PM
    2 Pages
    1 2
    • Replies: 21
    • Views: 6,205
    03-20-2008, 10:12 AM Go to last post
  57. Median with "tied values"

    Hi all, My first stats course was almost 20 years ago. I'm starting again and have come across a calculation for median that I've never seen...

    Started by Cheeseboy‎, 10-10-2011 09:13 PM
    2 Pages
    1 2
    • Replies: 21
    • Views: 10,704
    11-20-2011, 02:07 PM Go to last post
  58. please i need help in solving these questions

    hi all, please can anyone help me :( 1. The internal auditing staff of an local manufacturing company performs a sample audit each quarter to...

    Started by help101‎, 12-10-2011 02:56 PM
    2 Pages
    1 2
    • Replies: 21
    • Views: 11,342
    12-10-2011, 04:57 PM Go to last post
  59. when to use the median and when the mean ?

    Good morning, I have an assignment, I need to specify with examples, in which situation the mean is the best central measure and in which the...

    Started by Yankel‎, 01-06-2012 08:43 AM
    2 Pages
    1 2
    • Replies: 21
    • Views: 9,323
    01-08-2012, 01:25 PM Go to last post
  60. Is this approach permissible?

    Hello everyone, I am not so familiar with statistics but I have a question concerning the computation of a variable. I have collected data on...

    Started by julia89‎, 07-16-2012 09:37 AM
    2 Pages
    1 2
    • Replies: 21
    • Views: 4,346
    07-17-2012, 11:54 AM Go to last post

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