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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: 196,581
    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: 66,632
    09-30-2005, 09:44 AM Go to last post
  1. Independence of a linear and a quadratic form

    Hello, Can you please help me prove the following lemma? Let \mathbf{X \prime} = be observations of a random sample from a Normal...

    Started by JohnK‎, 05-08-2014 03:26 PM
    • Replies: 2
    • Views: 1,975
    05-08-2014, 05:29 PM Go to last post
  2. Football/Soccer World Cup Semi-Finalists

    Hiya, I'm trying to figure out how many combinations of semi-finalists you can get in the world cup. There are 32 teams, any of which can get into...

    Started by iambasil‎, 05-05-2014 04:42 AM
    • Replies: 1
    • Views: 1,519
    05-08-2014, 11:49 AM Go to last post
  3. Sign of covariance

    Hello everyone, I would like to know, if the following relationship holds in general: \left. \begin{aligned} cov(X,Y)& < 0 \\ % use \quad...

    Started by achacy‎, 05-08-2014 10:45 AM
    • Replies: 1
    • Views: 1,302
    05-08-2014, 11:27 AM Go to last post
  4. Is this a 3-way mixed ANOVA?

    I would be very grateful if you could help me: I am carrying out an experiment. I have 3 demographic groups (mothers, carers and old people). ...

    Started by annabatho‎, 05-06-2014 02:18 PM
    anova, mixed anova, repeated measure anova
    • Replies: 1
    • Views: 965
    05-08-2014, 10:39 AM Go to last post
  5. Likelihood function confusion over definition

    When we have a likelihood, say L(theta| x) would we say that L is the likelihood of (x1,x2) or (X1,X2) or neither? Where X1,X2 are the unobserved...

    Started by JJstar‎, 05-08-2014 06:01 AM
    • Replies: 0
    • Views: 1,320
    05-08-2014, 06:01 AM Go to last post
  6. Choosing the correct statistical method - analyzing data - confusion despite efforts

    Hi there, Despite much reading of the appropriate literature, including Andy Field's books and youtube videos, I am now more confused than ever as...

    Started by Psych13‎, 05-08-2014 04:57 AM
    • Replies: 2
    • Views: 1,591
    05-08-2014, 05:11 AM Go to last post
  7. Question Testing with a sample is significantly different to a population

    Dear Talk Stats-ists, This isn't a homework problem but I wasn't sure where else to post so apologies if it is the wrong place. I am a teacher,...

    Started by mrjdfield‎, 05-08-2014 03:07 AM
    • Replies: 0
    • Views: 1,054
    05-08-2014, 03:07 AM Go to last post
  8. Binomial Problem: Help!!

    Hey all, so I've been trying to understand this binomial problem for the last couple hours and its just not happening. Here's the problem: A...

    Started by danxie0212‎, 05-07-2014 11:20 PM
    binomial distribution
    • Replies: 0
    • Views: 1,210
    05-07-2014, 11:20 PM Go to last post
  9. 101 Homework Linear Regression Analysis

    When I'm asked to determine a linear regression model equation to represent data, am I being asked to create a graph? or enter the Y=25.326x + 353.16...

    Started by TaylorM‎, 05-07-2014 08:36 PM
    • Replies: 0
    • Views: 2,029
    05-07-2014, 08:36 PM Go to last post
  10. Lightbulb Test to see if two pairs of data are statistically significantly different

    Hello, I need to know how to test if two pairs of data are significantly different from each other. For example, I want to see if there are...

    Started by asun‎, 05-07-2014 08:11 PM
    • Replies: 0
    • Views: 882
    05-07-2014, 08:11 PM Go to last post
  11. Question for a struggling aspiring statistician

    I work in biological sciences and am not as strong in stats as I should be. We took 19 samples from a homogeneous pile of animal feed and sent it...

    Started by Yogurt1093‎, 05-07-2014 02:30 PM
    • Replies: 2
    • Views: 1,612
    05-07-2014, 02:55 PM Go to last post
  12. 2-way ANOVA, kinda sorta maybe?

    I am looking at the changes in organism growth over 2 months with 2 pH values and 2 temperatures. Treatments First set of organisms: pH 7.3 and...

    Started by imapiratesavvy‎, 05-06-2014 10:24 PM
    • Replies: 1
    • Views: 882
    05-07-2014, 02:12 AM Go to last post
  13. 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: 1,978
    05-07-2014, 01:31 AM Go to last post
  14. Quantitative or Qualitative??

    What type of sampling method is used for driving around and finding gas prices? Also would that be considered quantitative data?

    Started by john108‎, 05-06-2014 01:15 PM
    • Replies: 8
    • Views: 4,557
    05-06-2014, 06:08 PM Go to last post
  15. Red face One-way anova or paired t-test on intervention study? OR BOTH?

    Hi all. I'm planning a study where I get 3 separate groups of people, make them all do a satisfaction questionnaire, then give each group one...

    Started by annabatho‎, 02-13-2014 06:44 PM
    anova, before and after, one-way anova, paired t-test, t-test
    • Replies: 2
    • Views: 1,445
    05-06-2014, 01:28 PM Go to last post
  16. When is data 'nearly normal' - enough to break parametric rules

    Hi everyone, I am a student who has carried out a renewable energy experiment for a dissertation project. My dependent variable is total biogas...

    Started by statsnooby‎, 05-05-2014 05:56 PM
    • Replies: 12
    • Views: 4,057
    05-06-2014, 11:49 AM Go to last post
  17. interpreting standardized residuals in a chi-squared test

    Hello, I have attached my results from a chi-squared test. I am testing to see if there is a link between student grades and whether or not they...

    Started by Tig‎, 05-06-2014 08:58 AM
    • Replies: 2
    • Views: 4,871
    05-06-2014, 10:15 AM Go to last post
  18. Sampling error in a survey

    Hello, I have a question about surveys you see in the newspapers. I saw a survey with a question, having 3 items, and the people were asked to...

    Started by Yankel‎, 05-06-2014 02:21 AM
    • Replies: 0
    • Views: 1,491
    05-06-2014, 02:21 AM Go to last post
  19. Question 2 Coops and Chickens problem

    Hi, I have a question as homework to solve, but although it's so easy (as everyone says) I am not still able to solve it. Could you please help me...

    Started by Warrior‎, 05-05-2014 09:30 PM
    homework, probability, statistics
    • Replies: 4
    • Views: 1,805
    05-05-2014, 10:20 PM Go to last post
  20. Smile I need help on Analysing multiple response categorical outcome

    Dear all, I am interested to learn the effect of my predictors on the outcome variable . My study is to investigate whether socioeconomic...

    Started by Xinghechan‎, 05-05-2014 08:53 PM
    logistic regression
    • Replies: 0
    • Views: 800
    05-05-2014, 08:53 PM Go to last post
  21. Angry How to determine significant diff or not btwn slope and intercept of two datasets?

    Hi, this is for some research I'm doing in a lab, and I cannot for the life of me figure out how to determine if the two regression lines' slopes and...

    Started by kylehovey‎, 05-02-2014 01:13 PM
    ancova, excel, minitab, regression, slope
    • Replies: 1
    • Views: 1,146
    05-05-2014, 05:08 PM Go to last post
  22. Pulling the goalie...

    It's been a few years since I had my college stats class but I came into an argument with a friend about pulling the goalie in hockey and I can't...

    Started by schustda‎, 05-05-2014 12:42 PM
    • Replies: 1
    • Views: 1,667
    05-05-2014, 12:56 PM Go to last post
    • Replies: -
    • Views: -
    05-05-2014, 12:13 PM Go to last post
  23. Logistic Regression: Interpreting Continuous Variables

    Hi All, I had a couple of questions about interpreting odds ratios for continuous variables in logistic regression. I've done some significant...

    Started by amr262‎, 05-05-2014 05:32 AM
    logistic regression
    • Replies: 0
    • Views: 2,774
    05-05-2014, 05:32 AM Go to last post
  24. Choosing factors for principle components analysis

    Hello, I am running a PCA on a dataset that includes 43 water wells, each with up to five descriptive factors associated with it (temp, distance...

    Started by Molasses‎, 05-05-2014 04:57 AM
    factor analysis, multivariate analysis, pca, principle components
    • Replies: 0
    • Views: 923
    05-05-2014, 04:57 AM Go to last post
  25. help!!! parametric test or nonparametric test??

    I'm doing a research about the effect of certain lenses. thus, im comparing the result before and after subject wearing the lenses. however by using...

    Started by ccw123‎, 05-04-2014 09:25 AM
    • Replies: 2
    • Views: 1,961
    05-05-2014, 04:40 AM Go to last post
  26. Summing Uniform Distributions

    Hi, I can't seem to work out (or find anywhere) how to add two independent uniform distributions. My problem is as follows: I have random...

    Started by infinity_zero‎, 05-04-2014 10:43 PM
    correlation coefficient, pdf, uniform distribution
    • Replies: 1
    • Views: 2,295
    05-05-2014, 12:28 AM Go to last post
  27. Gamma Density and Jacobians

    I've got another doozy. Let fX (x) and fY (y) be Gamma density functions with parameters (α1, λ) and (α2, λ) respectively. Find the distributions...

    Started by infinity_zero‎, 05-05-2014 12:25 AM
    • Replies: 0
    • Views: 950
    05-05-2014, 12:25 AM Go to last post
  28. Question What are the data needed to conduct Cost-Effectiveness Analysis?

    Hello, I'm aiming to conduct a cost-effectiveness analysis (CEA) of the introduction of a new vaccine for HPV (Human Papillomavirus), in a...

    Started by THE STATISTICIAN‎, 05-04-2014 04:57 PM
    • Replies: 0
    • Views: 1,054
    05-04-2014, 04:57 PM Go to last post
  29. 2 independent groups - compare results of questionnaire

    Hi Guys, I am working on a project at work which has nothing to do with statistics, but as a small part of it I need to compare results of...

    Started by mirka‎, 05-04-2014 03:20 PM
    • Replies: 1
    • Views: 1,003
    05-04-2014, 03:31 PM Go to last post
  30. Statistical Help for Dissertation

    Hi there I'm currently undertaking my dissertation. I'm dong water quality and my data is as follows: Sites 2013/14 1978 1 7.98 7.06...

    Started by K31R‎, 04-30-2014 02:37 PM
    • Replies: 7
    • Views: 1,172
    05-04-2014, 01:36 PM Go to last post
  31. Non-normal distribution for a mixed ANOVA

    I am analysing a study using a 4-way mixed ANOVA. It has one between-subjects factor and 3 within-subjects factors (with 2, 2, and 3 levels). My...

    Started by coppersulphate‎, 05-04-2014 09:07 AM
    • Replies: 1
    • Views: 2,011
    05-04-2014, 01:00 PM Go to last post
  32. Simple Question But I Can't Find The Answer Anywhere!

    Basically I have a long list of numbers, 15000+, which relate to the retweet number of a tweet. I want to find a section of the values that are the...

    Started by bataille‎, 05-03-2014 07:23 AM
    • Replies: 3
    • Views: 1,139
    05-04-2014, 07:51 AM Go to last post
  33. Voter Turnout, Contradictory Results, SPSS

    I have a phone survey of 800 people in the little twin cities of “FR/NB.” My dependent variable is “Did you vote?” My seven independent variables are...

    Started by quashnet‎, 05-01-2014 09:01 PM
    • Replies: 3
    • Views: 1,966
    05-04-2014, 05:18 AM Go to last post
  34. AR(1) ACF Graph - Why is it showing correlations for lag bigger than 1?

    Hi Everybody, I think that my brain is lacking the part necessary to understanding time series. I've been researching an answer to my question...

    Started by JeDoisEtreHandicapeEnStat‎, 04-29-2014 03:58 AM
    • Replies: 3
    • Views: 2,449
    05-04-2014, 04:41 AM Go to last post
  35. difference in means, hypothesis testing ( 2 samp t test - 1 samp test)

    Hi, i am wondering why a regular 2 samp t test and a 1 samp t test gives different answers when the 1 samp is testing : h0: mean D =0 h1: mean...

    Started by benf1‎, 05-04-2014 02:23 AM
    • Replies: 2
    • Views: 1,979
    05-04-2014, 03:36 AM Go to last post
  36. Post What expected frequencies should I use?

    Hello, I'm in the middle of my dissertation and are struggling a little with finding the appropriate expected frequencies in a few Chi-Square...

    Started by makkedonien‎, 05-03-2014 04:12 AM
    chi square, expected frequency, likert scale
    • Replies: 1
    • Views: 1,293
    05-03-2014, 03:59 PM Go to last post
  37. problem with factor analysis

    I have a likerts scale with 5 questions for each variables. I have 6 variables in total including the DV. I ran the principle component analysis and...

    Started by star89‎, 05-03-2014 03:56 AM
    • Replies: 1
    • Views: 778
    05-03-2014, 03:54 PM Go to last post
  38. heart disease Chi square interpretation

    I have a dataset with 5 types of coronary heart disease and gender. After making a contingency table and testing it with the chi square test, I get a...

    Started by ivn‎, 05-03-2014 09:17 AM
    • Replies: 1
    • Views: 1,321
    05-03-2014, 01:27 PM Go to last post
  39. Repetead Intervention : which is the right test?

    Hi everybody, I'm new with this forum, hence sorry for any mistakes. I'm running a protocol with this scenario: ROUND 1: Baseline Data (T0) -...

    Started by ros.bucci‎, 05-02-2014 11:49 AM
    intervention, measurement, repetead
    • Replies: 5
    • Views: 1,450
    05-02-2014, 06:07 PM Go to last post
  40. 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: 4,860
    05-02-2014, 10:21 AM Go to last post
  41. Need help with data significance

    Hello. I am a complete statistics newbie, so I'm going to make this brief as possible, the data in question is here: http://i.imgur.com/Z7pcuO8.png ...

    Started by douglassnyde‎, 04-30-2014 11:42 PM
    • Replies: 3
    • Views: 1,680
    05-01-2014, 11:47 PM Go to last post
  42. Hosmer-Lemeshow Test Table Interpretation

    Hi! I need someone to interpret this. Sorry, I got no knowledge at all. I tried searching the forum but the analysis chapter of my thesis keeps on...

    Started by Anylopectina12‎, 04-23-2014 09:06 AM
    • Replies: 6
    • Views: 4,147
    05-01-2014, 10:19 PM Go to last post
  43. Error propagation when dividing by fitted model

    Hoping someone can help me / point me in the right direction with this one. Seems like it should be straight forward, but just can't quite get my...

    Started by Craiga‎, 05-01-2014 08:46 PM
    error propagation, model fit
    • Replies: 0
    • Views: 995
    05-01-2014, 08:46 PM Go to last post
  44. Outliers

    Hello there, I have data set of 5846 observations out of which 15 observations are outliers. I need to perform multiple linear regression which ...

    Started by AnnaPanna‎, 05-01-2014 03:52 PM
    linear regression, outliers, regression analysis, regression assumption, regression model
    • Replies: 1
    • Views: 1,109
    05-01-2014, 04:43 PM Go to last post
  45. how to check if difference in KS is significant

    Is there a way to check if the difference between 2 KS statistics is significant or not.. For example I have one KS at 0.698 and another at 0.685.....

    Started by podarum‎, 04-30-2014 12:47 PM
    • Replies: 2
    • Views: 1,188
    05-01-2014, 11:39 AM Go to last post
  46. Identifying null hypotheses

    A couple of simple questions that i'm not too sure about: I have a model y = a + b1D1it + b2D2it + b4D4it + et where D1-D4 are dummy variables...

    Started by ineedhelpineedhelp‎, 04-30-2014 06:11 PM
    • Replies: 4
    • Views: 1,910
    05-01-2014, 10:00 AM Go to last post
  47. Post Standard Deviation over 2 different scales

    Hi, I am hoping that an expert may be able to help me. I have some responses from a survey that captures data on 2 different scales (1-6 and...

    Started by euan1984‎, 05-01-2014 07:32 AM
    • Replies: 2
    • Views: 1,183
    05-01-2014, 09:10 AM Go to last post
  48. Question Mean centring: confused about instructions by supervisor?

    Hello everyone, I am really desperate and I would really appreciate it if someone could help me out. My thesis supervisor is a very busy guy, and...

    Started by almostthere‎, 04-30-2014 04:51 PM
    • Replies: 1
    • Views: 1,331
    05-01-2014, 07:00 AM Go to last post
  49. Testing heteroskedasticity in a bootstrapped quantile regression

    Hi, I am currently using stata to perform some regressions, and need help on how to perform specific tests on bootstrapped quantile regressions. I...

    Started by urvesh15‎, 04-30-2014 05:31 AM
    bootstrap, heteroskedasticity, quantile regression, stata
    • Replies: 3
    • Views: 2,528
    05-01-2014, 06:02 AM Go to last post
  50. Need help on determining sample size

    Problem: According to an article in US News & World Report, the Natural Resources Defense Council warns that the bottled water you are drinking may...

    Started by lindseyam‎, 05-01-2014 12:32 AM
    • Replies: 1
    • Views: 3,861
    05-01-2014, 03:11 AM Go to last post
  51. Need help with general statistics problem please

    How do you find the expected frequency? The follow table shows the results from 180 students randomly choosing among the numbers 1 to 10. Test to...

    Started by xxsilence23‎, 04-30-2014 11:49 PM
    chi square, expected frequency
    • Replies: 1
    • Views: 1,270
    05-01-2014, 02:49 AM Go to last post
  52. Statistics help - which stats test should I use for data?!

    Hello, Please help with this! I have an experiment with 2 IV and two levels. There were four blocks in the experiment and the data is ratio...

    Started by excel‎, 05-01-2014 02:32 AM
    • Replies: 0
    • Views: 743
    05-01-2014, 02:32 AM Go to last post
  53. balls of different colors

    Here is a question: A bag contains 100 balls. We randomly take 5 balls out the bag, and we find that the 5 balls have 3 different colors (e.g.,...

    Started by coyote‎, 05-01-2014 12:56 AM
    • Replies: 0
    • Views: 829
    05-01-2014, 12:56 AM Go to last post
  54. forecast modeling, am I doing this right?

    Forgive me father, it's been many years since my last biostats class. This isn't HW, just a side project that I picked up an don't want to embarrass...

    Started by noobers‎, 04-30-2014 11:49 PM
    • Replies: 0
    • Views: 807
    04-30-2014, 11:49 PM Go to last post
  55. Intervention Analysis - multiple interventions

    I am familiar with using Box and Tiao intervention analysis for a single intervention, but I was wondering what statistical method to use for the...

    Started by Stat8‎, 04-30-2014 11:30 PM
    • Replies: 1
    • Views: 1,142
    04-30-2014, 11:34 PM Go to last post
  56. I don't understand the results of my ANOVA

    I have run general linear model (ANOVA) in SPSS to test whether habitat type (2 categories) and habitat disturbance (2 categories) have an effect on...

    Started by aelw‎, 04-30-2014 02:35 PM
    anova, biology, ecology
    • Replies: 1
    • Views: 1,059
    04-30-2014, 03:39 PM Go to last post
  57. Experimental Design/Need help reviewing my answers

    I am having difficulties with questions below. I know I have a couple of them wrong, but I am not sure which one. I keep going over and over trying...

    Started by viv_shc‎, 04-30-2014 03:30 PM
    experiment design, sampling design
    • Replies: 0
    • Views: 2,174
    04-30-2014, 03:30 PM Go to last post
  58. Copulas: How Archimedean copulas satisfy the general copula definition

    Supposing FI=generator function of an Archimedean copula. INVFI = inverse of this generator function FI(INVFI(u1), ..., INV(u(d))) is an...

    Started by Mary12345‎, 04-30-2014 01:20 PM
    archimedean, copula, generator
    • Replies: 0
    • Views: 888
    04-30-2014, 01:20 PM Go to last post
  59. CART produced by rpart() and tree()

    Dear All, I have a pretty hard time of interpreting the result generated by the commands rpart(). For example, below is my code of using the...

    Started by shijbian‎, 04-30-2014 06:19 AM
    cart, rpart, tree
    • Replies: 0
    • Views: 2,121
    04-30-2014, 06:19 AM Go to last post

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