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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: 197,002
    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: 66,873
    09-30-2005, 09:44 AM Go to last post
  1. A query about interaction and contrasts

    Hello everybody, I'm quite new at statistics, despite I'm doing research since some time ago. I've a straightforwad query this time. Well: -My...

    Started by Gilgamesh81‎, 11-09-2008 01:00 PM
    • Replies: 0
    • Views: 1,731
    11-09-2008, 01:00 PM Go to last post
  2. A question + some problem

    Hi all, I am glad that i found this forum. Statistics have never been my strong point. Anyway, I have a qustion and a rather strange problem. My...

    Started by giannis‎, 11-09-2007 01:28 AM
    • Replies: 3
    • Views: 1,821
    11-09-2007, 07:22 PM Go to last post
  3. A question about ANCOVA

    Hello, I am working on a pre-test post-test quasi-experimental design, for testing the effectiveness of 2 teaching methods. There are 2...

    Started by statanx‎, 01-19-2012 06:39 AM
    • Replies: 2
    • Views: 1,083
    01-21-2012, 05:54 AM Go to last post
  4. 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: 899
    06-02-2016, 11:56 AM Go to last post
  5. A question about determining significance

    Hi guys I'm trying to compare the differences in the results of a fitness test done by two different methods (and performed on a sample group of...

    Started by Sinkers‎, 05-07-2010 08:25 AM
    2 Pages
    1 2
    • Replies: 16
    • Views: 7,626
    05-12-2010, 03:10 AM Go to last post
  6. A question about effect sizes (cohen's d)

    Hi there, i'd very much appreciate anyone's help. I need to calculate effect sizes (cohen's d) for pre and post scores for a treatment i've been...

    Started by that_guy_‎, 08-22-2008 11:33 AM
    • Replies: 1
    • Views: 5,906
    08-22-2008, 12:47 PM Go to last post
  7. A question about p-value interpertation

    Hello. I would really appreciate help with a question I am facing. I hope I am posting it in the right place. I am preparing for a board exam in...

    Started by Nir‎, 02-09-2016 08:27 AM
    • Replies: 4
    • Views: 2,461
    02-10-2016, 06:21 PM Go to last post
  8. Red face A question about paired sample t test

    I have a question about paired sample t test, your advices are much appreciated. Thanks. I know paired-sample t test is for the same group of...

    Started by Pele‎, 07-07-2013 12:15 PM
    paired sample, t test
    • Replies: 1
    • Views: 2,664
    07-07-2013, 04:41 PM Go to last post
  9. A Question about Regression analysis

    Hello! If only pretest scores are used as a covariate in a pre-posttest experimental study (& a number of other relevant independent variables can...

    Started by KathyJ‎, 02-05-2013 12:49 PM
    • Replies: 5
    • Views: 1,760
    02-11-2013, 10:08 AM Go to last post
  10. A question about Spearman's Rank and Mean Values

    Hello, I'm not entirely sure I've put this in the correct forum... This is possibly a daft question, but I have used SPSS to calculated...

    Started by LianeSF‎, 04-27-2015 10:56 AM
    correlation coefficient, spearman's rank
    • Replies: 2
    • Views: 839
    04-28-2015, 04:54 AM Go to last post
  11. a question about statistic approach to use

    I moved this thread to another place and please delete this thread. Thank you.

    Started by lmuri‎, 08-03-2015 11:22 AM
    anova, paired t-test, within-subject
    • Replies: 0
    • Views: 1,374
    08-03-2015, 11:22 AM Go to last post
  12. A question about the time series

    I am doing my homework about time series. And I got stuck at the part b, as I am not sure how to calculate the E(Zt^2). For example, I want to know...

    Started by kenng96‎, 10-01-2017 11:19 AM
    • Replies: 0
    • Views: 182
    10-01-2017, 11:19 AM Go to last post
  13. A question about using Generalized estimating equations (GEEs)

    Dear All, I have a question regarding using GEEs to test some of my mating system data (the temporal and spatial proximity of males in regard to a...

    Started by gludo‎, 10-09-2017 06:23 AM
    • Replies: 0
    • Views: 42
    10-09-2017, 06:23 AM Go to last post
  14. A question about when two way ANOVA is appropriate

    If I'm comparing two factors Shipping method and Production Location and its a 3x3 test but I only have one replication for each level should the...

    Started by DanielAurelius‎, 02-08-2011 09:45 PM
    • Replies: 2
    • Views: 2,847
    02-09-2011, 03:03 PM Go to last post
  15. Red face A question about whether dropping interaction terms as a whole or not

    Hello! I'm taking a regression course this semester and I have a question regarding when to drop the interaction terms. Suppose we have a...

    Started by freezingswallow‎, 11-19-2014 11:32 AM
    dummy variable, interaction, regression
    • Replies: 3
    • Views: 1,067
    11-19-2014, 04:14 PM Go to last post
  16. a question from a newbie

    well, im new to stats and to this forum but got a little bit confidence after starting to read discovering stats with spss of andy field. i want...

    Started by srht ky‎, 05-05-2014 03:17 PM
    • Replies: 4
    • Views: 2,008
    05-07-2014, 01:31 AM Go to last post
  17. A question in methodology

    Good evening, I have a question about methodology, coz i do not know which way to go. For representing av results, I have used descriptive...

    Started by badibad‎, 06-08-2013 02:59 PM
    • Replies: 7
    • Views: 1,258
    06-09-2013, 04:03 AM Go to last post
  18. A question in Statistics.

    Can someone help me with this problem? It's file attachment below.

    Started by vodanh_123‎, 05-20-2015 01:56 AM
    • Replies: 0
    • Views: 864
    05-20-2015, 01:56 AM Go to last post
  19. a question in uniform distribution

    suppose X1,…,Xn be random sample of U(0,θ) distribution. if X(n) be largest order statistics of sample, and V=nX¯/X(n), how can I calculate...

    Started by hadiSanji‎, 03-30-2014 08:36 PM
    • Replies: 1
    • Views: 1,598
    03-30-2014, 11:15 PM Go to last post
  20. A question on an estimating equation

    This is a question that arose from studying Hogg and Craig "Introduction to Mathematical Statistics",7th edition, pg 568. Please see the attachment....

    Started by JohnK‎, 05-19-2014 05:17 AM
    • Replies: 0
    • Views: 855
    05-19-2014, 05:17 AM Go to last post
  21. A question on central limit theorem

    Hi I have a quick question on central limit theorem. I am missing something obvious so hoping someone can help. If we had a sample set of say...

    Started by curious‎, 04-24-2012 10:36 PM
    central limit theorem
    • Replies: 7
    • Views: 2,925
    05-03-2012, 12:39 PM Go to last post
  22. a question on errors-in-variable model

    Is the parameter estimate obtained using an instrumental variable unbiased? If not, is there formula for estimated variance and sampling bias of the...

    Started by ms1980_cn‎, 01-25-2010 05:05 PM
    • Replies: 0
    • Views: 2,183
    01-25-2010, 05:05 PM Go to last post
  23. A question on means, adding and taking scores and standard deviation.

    need a bit of help on my statistics homework. I've taken the class twice and no matter how much I study I seem to only be able to achieve a D. So...

    Started by Deganveran‎, 02-06-2010 09:47 PM
    • Replies: 3
    • Views: 21,429
    02-08-2010, 01:41 PM Go to last post
  24. A question on only 1 aspect of this problem

    This problem as a whole is not elementary statistics, however, I a question with only 1 aspect of this problem which is elementary. I'll go ahead and...

    Started by StatStudent3‎, 11-15-2010 07:46 PM
    • Replies: 1
    • Views: 2,802
    11-15-2010, 08:09 PM Go to last post
  25. A Question on Percentiles

    Hi All, I have a question on percentiles. I have some data that is in 5 minute intervals. Each 5 minute period has an average time in seconds that...

    Started by ali13‎, 07-30-2007 05:49 AM
    • Replies: 2
    • Views: 2,775
    08-09-2007, 04:48 AM Go to last post
  26. A question on treatment statistics

    Hi - im new here, so i dont know how this works, but i hope someone will take some time to explain this to me. The model is called the 'switching...

    Started by mads_st‎, 01-20-2010 09:56 AM
    • Replies: 0
    • Views: 1,895
    01-20-2010, 09:56 AM Go to last post
  27. A question regarding cross tabulation and Fisher's exact test

    Hello guys I have a set of categorical data and I want to test the significance of the deviation for. Here are the details; I have a population...

    Started by scerab‎, 02-24-2011 12:57 AM
    • Replies: 5
    • Views: 3,863
    02-24-2011, 03:35 PM Go to last post
  28. A question regarding the size of a sample

    Hello everyone! these days I am working with seemingly unrelated regression to improve the efficiency of my results. Now, I am wondering how...

    Started by nelson‎, 11-20-2008 09:20 AM
    • Replies: 0
    • Views: 1,789
    11-20-2008, 09:20 AM Go to last post
  29. a quick stats questions about p and F/t values

    Hi, I am pretty new to stats and am doing a heap of F-tests and t-tests. i was under the impression that when the calculated value (F or t) was...

    Started by sqrt‎, 09-08-2010 01:12 AM
    • Replies: 1
    • Views: 2,816
    09-08-2010, 09:52 AM Go to last post
  30. A random sample

    Hi, Can someone help me? n=18 o=10 Alfa=5% Is that good? ;)

    Started by Lauryne‎, 11-30-2010 01:22 PM
    • Replies: 1
    • Views: 2,767
    12-01-2010, 02:14 PM Go to last post
  31. A reference for those who have censored data (below detectable limits)

    Hi everyone. There have been a couple of enquiries lately about censored data (data that are below detectable limits). I deal with this alot...

    Started by bugman‎, 05-16-2011 06:54 PM
    • Replies: 0
    • Views: 1,734
    05-16-2011, 06:54 PM Go to last post
  32. A regular EOQ model is appropriate when demand is seasonal.

    A regular EOQ model is appropriate when demand is seasonal. a. True b. False

    Started by micheal‎, 12-06-2011 03:45 PM
    • Replies: 4
    • Views: 4,276
    12-07-2011, 11:01 AM Go to last post
  33. A sampling power question

    Hi I have a question regarding a power calculation. It is best explained by the example below: If I have a lot of of red and black balls in a...

    Started by takiska‎, 02-08-2011 03:41 PM
    • Replies: 5
    • Views: 2,811
    02-09-2011, 04:48 PM Go to last post
  34. a sampling strategy to compare population densities between unequally sized habitats

    Hello, If I want to compare the population density of a single species found in each of three habitats, I am unsure whether to use a stratified...

    Started by Bike_Tim‎, 04-25-2011 01:43 PM
    • Replies: 0
    • Views: 2,174
    04-25-2011, 01:43 PM Go to last post
  35. A simple one but having a hard time to explain

    Well as you may or not know i'm writing my thesis... The deal is i created a linear regression model. I found in the model that, lets give it...

    Started by doctor‎, 11-01-2008 03:09 PM
    • Replies: 0
    • Views: 2,173
    11-01-2008, 03:09 PM Go to last post
  36. a simple problem

    in elections , the mean of candidates per an electoral district was 60 candidates with a standard deviation 10 candidates.. 80% were males . for...

    Started by Mongey‎, 06-06-2008 07:38 PM
    • Replies: 0
    • Views: 2,445
    06-06-2008, 07:38 PM Go to last post
  37. A simple problem, maybe?

    Hi, My grasp of statistics is limited to one undergraduate course, so please bear with me. I have the following problem: I have a population...

    Started by pfpc‎, 10-21-2009 11:16 AM
    • Replies: 2
    • Views: 2,497
    10-21-2009, 12:11 PM Go to last post
  38. Red face A simple question about correlation___new comer

    Hi everybody, I'm new here =) I like statistics!!! Now comes my question: Known item-total correlation of each item in a scale, can the...

    Started by Fran‎, 08-02-2013 12:24 AM
    • Replies: 3
    • Views: 1,231
    08-02-2013, 01:56 PM Go to last post
  39. a simple question about expectation with 2 random variables.

    Dear all... Please help me with this simple example. Example)X and Y are 2 random variables with the density function of below. f X,Y (x,y)={ 2 ...

    Started by googooloo‎, 06-29-2011 06:26 AM
    • Replies: 1
    • Views: 1,715
    06-29-2011, 06:51 AM Go to last post
  40. A simple question about variance/standard deviation

    I have a simple question about variance and standard deviation. i know they try to represent the average deviance from the mean. But why use sum of...

    Started by Penguin 101‎, 01-04-2011 05:52 PM
    • Replies: 9
    • Views: 6,349
    01-05-2011, 05:27 PM Go to last post
  41. A simple question by an amatuer

    Hi, I'm having a lot of trouble with a particular question I have been given: The following data sets represent the gross yield (%) on 14 oil...

    Started by euan‎, 11-01-2007 08:25 AM
    • Replies: 1
    • Views: 2,147
    11-01-2007, 02:03 PM Go to last post
  42. A simple question regarding coefficient of variation in angular measurements.

    Hi all It is not a major question, just for personal curiosity. Our statistics proff states that it is the coefficient of variation (CV = SD...

    Started by victorxstc‎, 07-03-2012 05:15 AM
    • Replies: 0
    • Views: 2,238
    07-03-2012, 05:15 AM Go to last post
  43. A simple question!

    I have a very simple but basic question. I work using real time polymerase chain reaction (RTPCR) for estimation of the number of mRNAs coding for...

    Started by victoreme‎, 09-16-2011 01:54 PM
    • Replies: 0
    • Views: 1,843
    09-16-2011, 01:54 PM Go to last post
  44. Question A simple question: Looking to compare counts conducted by 2 counters of the same data

    Hello, I am looking for an appropriate statistical method to test my hypothesis that there is no significant difference between counts conducted...

    Started by jon5hill‎, 02-06-2014 06:20 PM
    • Replies: 3
    • Views: 1,384
    02-06-2014, 06:46 PM Go to last post
  45. Red face A Simple Survey -- Critique Me!

    Hi everyone! First time poster here! :wave: I'm designing a survey for my small business -- but unfortunately, I know very little about...

    Started by JulieGirl1982‎, 08-13-2006 04:02 PM
    • Replies: 0
    • Views: 1,849
    08-13-2006, 04:02 PM Go to last post
  46. A single value that summarises trust in sample mean

    Suppose I have a number N of independent ratings of a given item, where each rating is an integer between 1 and 7 (inclusive). For simplicity sake,...

    Started by jon_smark‎, 07-08-2011 06:09 PM
    • Replies: 4
    • Views: 2,567
    07-09-2011, 11:14 AM Go to last post
  47. A small DNA with statistics puzzle

    I'm a geneticist, having a problem with the following question. If anyone could help me out? - A sequence consists of nucleotides - A nucleotide...

    Started by erwin_se‎, 10-22-2007 09:50 AM
    • Replies: 0
    • Views: 2,626
    10-22-2007, 09:50 AM Go to last post
  48. A Soldier in Combat need help with Discussion (Monty Hall)

    Can anyone please tell me in Statistics with the following A number of years ago, there was a popular television game show called "Let's Make a...

    Started by Deshun1970‎, 03-19-2011 06:26 PM
    2 Pages
    1 2
    • Replies: 19
    • Views: 11,137
    03-21-2011, 03:26 PM Go to last post
  49. A statistic question.

    Provider Charge(Total) Fraud %Fraud Fraud*%Fraud A §§§§§§§1000§§§§§§§600§§§§§0.6§§§§§§360 B §§§§§§§100§§§§§§§§70§§§§§§0.7§§§§§§49 C...

    Started by SASMATH‎, 07-19-2016 08:55 PM
    expectation, modeling, sas, statisics, weighted
    • Replies: 0
    • Views: 1,007
    07-19-2016, 08:55 PM Go to last post
  50. A Statistical Test Learning Rate?

    First off, I apologize if I am creating a new thread for something that already exists. I used the search option, but didn't find anything that...

    Started by PillBaxton‎, 08-21-2015 08:17 AM
    between-subjects, learning rate, within-subjects
    • Replies: 0
    • Views: 1,099
    08-21-2015, 08:17 AM Go to last post
  51. a statistics book that include these topics?

    Hello, I am after a statistics book that include the following topics: logit and probit modelling, advanced discrete choice or outcome techniques...

    Started by t.wang21@yahoo.com.au‎, 08-13-2011 06:31 AM
    • Replies: 1
    • Views: 2,206
    08-15-2011, 06:43 AM Go to last post
  52. A statistics problem and no clue how to solve it

    Hi All, This is my first post on this forum, I hope I've come to the right place. I'm a complete idiot when it comes to statistics, but I have a...

    Started by mundungus‎, 02-28-2009 08:45 PM
    • Replies: 5
    • Views: 3,118
    03-01-2009, 08:21 PM Go to last post
  53. a student after data transformation

    Hi all, I am working with a set of microarray data consisted of 211 samples and 20000 genes each. I try to calculate the differences of gene...

    Started by Wendy‎, 02-26-2010 07:00 AM
    • Replies: 1
    • Views: 1,761
    02-28-2010, 08:13 PM Go to last post
  54. A student organization

    Is this answer correct? A student organization plans to ask 100 randomly selected students how much they spent on textbooks last semester. You...

    Started by Jerryberry‎, 01-15-2006 11:39 PM
    • Replies: 1
    • Views: 3,736
    01-16-2006, 10:00 AM Go to last post
  55. A study was carried out to investigate whether the type of milk used is the same ....

    A study was carried out to investigate whether the type of milk used is the same among young people as among older ones. A sample of 500 people...

    Started by brooke‎, 03-06-2016 02:43 PM
    • Replies: 4
    • Views: 1,678
    03-07-2016, 02:35 PM Go to last post
  56. a suitable rough rescaling

    hello there, I want to use k-nearest neighbours but first I need to scale the data so that the range of the 7 explanatory is roughly 1.I have...

    Started by katerina‎, 04-07-2009 04:56 AM
    • Replies: 0
    • Views: 1,680
    04-07-2009, 04:56 AM Go to last post
  57. a suitable roughly rescale

    Hi there the folowing code is for training dataset (trPima) and testing dataset (tePima) I want to use k-nearest neighbours but first I need to...

    Started by katerina‎, 04-16-2009 04:00 AM
    • Replies: 0
    • Views: 1,788
    04-16-2009, 04:00 AM Go to last post
  58. A survey where participants circled at least one answer as the question asked

    I have surveys I am working on. One of the questions asks the participants to circle religious themes that appeals to them and also that they should...

    Started by jmuvekwa‎, 03-29-2015 01:00 AM
    data cleaning, data computing, econometrics, statistics
    • Replies: 0
    • Views: 1,391
    03-29-2015, 01:00 AM Go to last post
  59. A T test, MRPP, or something else? Using R or Systat

    MRPP (Multiple Response Permutation Procedures) has a stand alone software: Blossom. It works well. Cheers,

    Started by nofunsally‎, 07-25-2008 08:32 PM
    • Replies: 0
    • Views: 2,125
    07-25-2008, 08:32 PM Go to last post
  60. A test for a 'buffer' hypothesis

    Just wondered if anyone knows how I can test the hypothesis: 'Higher levels of Job Control act as a buffer against fatigue related to Job Demands' ...

    Started by Macka‎, 05-03-2007 10:26 PM
    • Replies: 0
    • Views: 1,512
    05-03-2007, 10:26 PM Go to last post

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