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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 11:13 AM
    • Replies: 1
    • Views: 125,015
    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: 34,874
    09-30-2005, 09:44 AM Go to last post
  1. Differentiation Involving Determinant.

    I have to compute the following differentiation : \frac{\partial}{\partial\sigma^2}\det, where \sigma^2 is a scalar, \det denotes determinant,...

    Started by Cynderella‎, Yesterday 12:41 AM
    calculus, derivatives, matrix multiplication, multivariate gaussian mle, reml
    • Replies: 0
    • Views: 60
    Yesterday, 12:41 AM Go to last post
  2. Help on my masters thesis please!

    So i'm a dentistry student working on my masters thesis and i find myself needing some help on some statistical analysis. I'm (trying) to use SPSS...

    Started by xDafonso‎, 05-21-2016 06:31 PM
    • Replies: 5
    • Views: 195
    05-22-2016, 03:13 PM Go to last post
  3. Bayesian test with exponential density function.

    I need to do a bayesian test for a simple random sample with exponential distribution and N(2,3) as a prior distribution conditioned by: Null...

    Started by GeorgeFC‎, 05-22-2016 10:27 AM
    • Replies: 0
    • Views: 68
    05-22-2016, 10:27 AM Go to last post
  4. Using pooled data formula or not?

    The question is: Broken arms can be treated with surgery or splints. In a study with 200 patients, half had surgery and half used splints. In the...

    Started by polkadotti101‎, 05-22-2016 09:38 AM
    alpha, hypothesis, p value, pooled
    • Replies: 0
    • Views: 64
    05-22-2016, 09:38 AM Go to last post
  5. glm repeated measures

    Hello all, I am running a repeated measures analyses, with a continuous set of variables, but I want to compare between 4 groups (ordinal...

    Started by Hani Tamim‎, 05-21-2016 05:55 PM
    • Replies: 0
    • Views: 58
    05-21-2016, 05:55 PM Go to last post
  6. Comparison of two groups question

    Hi all. I think this is quite an elementary question, but I need a little bit of advice. I have some data on a workforce. For each member of the...

    Started by tonytheviking‎, 05-21-2016 06:29 AM
    • Replies: 3
    • Views: 104
    05-21-2016, 10:16 AM Go to last post
  7. one sample t test between percents

    if I have two percentages say 50% and 10% from a survey conducted with 20 people and there are 3 possible answers yes, no and don't know ...

    Started by freddywills‎, 05-21-2016 03:12 AM
    • Replies: 2
    • Views: 119
    05-21-2016, 05:33 AM Go to last post
  8. Showing Left Side to Right Side.

    Let \mathbf x is a (p\times 1) vector, \mathbf\mu_1 is a (p\times 1) vector, \mathbf\mu_2 is a (p\times 1) vector, and \Sigma is a (p\times p)...

    Started by Cynderella‎, 05-21-2016 12:48 AM
    bivariate gaussian, matrix algebra, multivariate analysis
    • Replies: 0
    • Views: 58
    05-21-2016, 12:48 AM Go to last post
  9. Analyse test for heteroskedasticity

    Hello I am working on a little statistic research and I am not sure how to interpret these datas. I have a multiple regression with 3 exogene...

    Started by Lord_Stark‎, 05-20-2016 01:47 AM
    • Replies: 0
    • Views: 88
    05-20-2016, 01:47 AM Go to last post
  10. Help on choosing what method!

    An experiment was done to look at the positive arousing effects

    Started by Paulducci‎, 05-18-2016 06:33 PM
    • Replies: 4
    • Views: 252
    05-20-2016, 12:54 AM Go to last post
  11. help with ACF and PACF

    Hi Guys, Can some one help with interpreting the ACF and PACF graph, I have run a multiple regression and suspect the errors are autoregressive. I...

    Started by mayccc‎, 05-18-2016 10:11 AM
    • Replies: 1
    • Views: 115
    05-18-2016, 12:05 PM Go to last post
  12. Find out significant variables

    Hi I have a data table consisting of normalized frequencies (out of 100) of certain linguistic features. Please see the sample below. There are...

    Started by true_friend‎, 05-16-2016 07:57 AM
    significant difference
    • Replies: 4
    • Views: 178
    05-18-2016, 03:52 AM Go to last post
  13. help on chi-square test

    Hi, can somone help me with doing a Chi-square test or Yates corrected chi-square test of the data file I have attached. I dont get it, or is the...

    Started by Anne3‎, 05-18-2016 03:06 AM
    • Replies: 0
    • Views: 105
    05-18-2016, 03:06 AM Go to last post
  14. Mean/St.dev analysis

    Hello everyone, a pleasure for me to write in the community I'm currently looking to understand whether it sounds statistically correct the...

    Started by Talalapunzicher‎, 05-17-2016 04:25 PM
    • Replies: 0
    • Views: 113
    05-17-2016, 04:25 PM Go to last post
  15. Distribution of Sample Means

    Say for instance you are running a test for one population mean, a t-test. I know you need the distribution of sample means. What I want to know is...

    Started by StilloftheNight‎, 05-17-2016 03:45 PM
    • Replies: 0
    • Views: 86
    05-17-2016, 03:45 PM Go to last post
  16. Defining Contrast Matrix

    In the book Applied Longitudinal Analysis, 2nd Edition there is an example in the chapter "Marginal Models: Generalized Estimating Equations (GEE)"...

    Started by Cynderella‎, 05-17-2016 08:55 AM
    contrast coefficients, experimental design, gee, hypotheses testing, longitudinal study
    • Replies: 0
    • Views: 75
    05-17-2016, 08:55 AM Go to last post
  17. Please help - Really struggling with % statistics issue

    Hi Guys, I'm really hoping someone can help me on this, as I've spent quite a while researching to no avail! The table below (bottom of the...

    Started by mathay2603‎, 05-17-2016 04:47 AM
    • Replies: 0
    • Views: 86
    05-17-2016, 04:47 AM Go to last post
  18. T-test vs ANOVA contrasts

    Apologies in advance if this question is a bit dumb, it's been a while since I used ANOVA tests and contrasts.... I have a data set in which...

    Started by dibella‎, 05-16-2016 08:35 PM
    • Replies: 0
    • Views: 105
    05-16-2016, 08:35 PM Go to last post
  19. Correlation question

    Hi all. Just a quick Q for anyone with a stats head on them. Am I breaking any statistical rules by correlating variables in the following way. Say...

    Started by Darkest Horse‎, 05-16-2016 05:08 PM
    • Replies: 0
    • Views: 88
    05-16-2016, 05:08 PM Go to last post
  20. Question Z - score

    Well, my question may seem a little silly to most advanced in the area, but it has taken my sleep. That is the question: I have a set of...

    Started by Molécula‎, 05-16-2016 02:27 PM
    • Replies: 0
    • Views: 88
    05-16-2016, 02:27 PM Go to last post
  21. Question Truncated Data Analysis - Standard Deviation

    It has been too long since I have utilized statistics, so looking for a little simple instructions. Need to verify if my approach is at all correct?...

    Started by crumfert‎, 05-16-2016 02:14 PM
    • Replies: 0
    • Views: 91
    05-16-2016, 02:14 PM Go to last post
  22. Hypothesis difficulty

    Let Y_{ij}=1 if the i^{\text{th}} child is classified as obese at the j^{\text{th}} occasion, and Y_{ij}=0 otherwise. The marginal probability of...

    Started by Cynderella‎, 05-16-2016 07:41 AM
    gee, glm, hypotheisis testing, interaction term, longitudinal
    • Replies: 0
    • Views: 64
    05-16-2016, 07:41 AM Go to last post
  23. which test? random selection of raters from a pool with averaged results

    Hi all, I have 11 raters that I am comparing to a gold standard test. I would like to run a test that randomly selects 5 (also 7 and 9) raters for...

    Started by haymaree‎, 05-16-2016 04:36 AM
    • Replies: 0
    • Views: 59
    05-16-2016, 04:36 AM Go to last post
  24. What is SPSS's default outlier checker in the explore function?Are there better ways?

    Dear Everyone, Does anyone know what test SPSS uses in the explore function found in the descriptives section? I assume it is something like...

    Started by tro2‎, 05-15-2016 12:55 PM
    • Replies: 0
    • Views: 91
    05-15-2016, 12:55 PM Go to last post
  25. How can calculate the percentage?

    Hi, Anyone know how can make this table? How can calculate the percentage? http://www.ncbi.nlm.nih.gov/pmc/articles/PMC3769886/ ...

    Started by yueli7‎, 05-15-2016 12:17 PM
    • Replies: 0
    • Views: 63
    05-15-2016, 12:17 PM Go to last post
  26. Rand(vars)

    When i run a mixed logit model about the labour supply what are the random variables ? Sex, age?

    Started by Lena‎, 05-15-2016 08:58 AM
    • Replies: 0
    • Views: 77
    05-15-2016, 08:58 AM Go to last post
  27. Cool Compare Percentages

    I have some survey data and know the number and percentage of "yes" responses. How do I determine if any of the percentage yes regional responses...

    Started by cybermark‎, 05-14-2016 03:08 PM
    • Replies: 1
    • Views: 125
    05-15-2016, 04:51 AM Go to last post
  28. Are the Observations in A Random Sample Independent?

    Hi, guys. I am learning the t-test on my own. The assumptions of t-test have been confusing to me. The assumptions included "A random...

    Started by Evan918‎, 05-13-2016 02:31 AM
    independent observations, random sample, statistics
    • Replies: 3
    • Views: 177
    05-15-2016, 03:45 AM Go to last post
  29. Testing the mean of a group with...

    Is it correct to compare the mean of a subsample with the entire sample? or I have to compare the mean of a subsample with the other subsamples...

    Started by DuarteR‎, 05-13-2016 04:13 PM
    • Replies: 1
    • Views: 166
    05-14-2016, 03:33 PM Go to last post
  30. Rejection Sampling

    Hello! I am student of statistics from Mexico and I always like to deeply understand the logic of the subjects in each of my courses. This time...

    Started by Eddie_th12‎, 05-14-2016 02:24 PM
    • Replies: 0
    • Views: 94
    05-14-2016, 02:24 PM Go to last post
  31. ritical value approach

    I need help for this question The sponsors of televisions shows targeted at the market of 5 - 8 year olds want to test the hypothesis that...

    Started by chen‎, 05-13-2016 02:55 AM
    • Replies: 0
    • Views: 109
    05-13-2016, 02:55 AM Go to last post
  32. Mixed logit

    Can anyone please help with mixed logit model? I have 3 choice of hours. How does it work in general?

    Started by Lena‎, 05-12-2016 03:46 PM
    • Replies: 0
    • Views: 72
    05-12-2016, 03:46 PM Go to last post
  33. Results of Sign Test

    Hi all, I was hoping somebody could help me with understanding the results of a sign test. I am not a statistician but a medic trying to...

    Started by mgjvegas‎, 05-11-2016 03:08 PM
    • Replies: 2
    • Views: 161
    05-12-2016, 02:17 PM Go to last post
  34. Which statistical test should I be using?

    Hi, im currently doing a dissertation on how people body condition score underweight dogs differently to overweight dogs so I have conducted a survey...

    Started by RichTS7‎, 05-11-2016 05:20 PM
    • Replies: 1
    • Views: 177
    05-12-2016, 02:14 AM Go to last post
  35. Trend Line Help

    I'm struggling with the problem below and really need a starting place. Can someone please explain how they knew which formula to use? How do I...

    Started by trevora0‎, 05-10-2016 09:23 PM
    • Replies: 3
    • Views: 174
    05-11-2016, 05:24 PM Go to last post
  36. finding p value

    Here's what is given: SE of .1 Average mean: 5.4 ft (100 penguins tested) significance level: 5% (0.05) find p-value and testis there is...

    Started by Wooshj‎, 05-10-2016 03:46 PM
    • Replies: 1
    • Views: 152
    05-10-2016, 04:33 PM Go to last post
  37. Statpedia: Looking for feedback & help

    Hello, My team and I recently created an open project for people to create charts in a super easy way. I thought I would share it with this group...

    Started by statpedia‎, 05-09-2016 06:16 PM
    beginners, charts, data visualization, help needed, stats
    • Replies: 0
    • Views: 120
    05-09-2016, 06:16 PM Go to last post
  38. ZINB & interpretation moderating effects

    Hello everyone, I have a model with a dependent variable (Y), an independent variable (X), and three moderator variables (M1, M2, M3). Using a...

    Started by stat1990‎, 05-09-2016 09:46 AM
    • Replies: 2
    • Views: 125
    05-09-2016, 01:50 PM Go to last post
  39. Question Average delay

    Dear All, i have a problem with calculate a statistics value. So, consider we have two classes,: class A, class B. every classes have 10 values....

    Started by khoubeil‎, 05-07-2016 06:29 AM
    average delay, nan value, statistics
    • Replies: 0
    • Views: 168
    05-07-2016, 06:29 AM Go to last post
  40. Exclamation wald test in stata

    Hello everyone! I googled my issue but I am not sure about the answer i got. I want to perform a wald test to test each coeff. in my multiple...

    Started by Lisa92‎, 05-07-2016 05:56 AM
    • Replies: 0
    • Views: 137
    05-07-2016, 05:56 AM Go to last post
  41. Comparing two samples

    Hello, I'm working on a paper on Social media usage among university professors, and I'm comparing between two major networks (Facebook, Twitter),...

    Started by iha2005‎, 05-07-2016 04:47 AM
    comparing groups, comparing samples
    • Replies: 0
    • Views: 149
    05-07-2016, 04:47 AM Go to last post
  42. How does OLS regression related to generalise linear modelling

    Hi, I need to understand how OLS regression relates to generalise linear modelling. Does the relationship only exist when the assumptions of...

    Started by Mid‎, 05-06-2016 05:06 PM
    generalised linear models, ols regression
    • Replies: 0
    • Views: 133
    05-06-2016, 05:06 PM Go to last post
  43. Understanding A Basic Probability

    Hi everyone, I'm new here, so I apologize if this post is in the wrong forum or of incorrect format. So my question is; Assuming Person A has...

    Started by Hammy‎, 05-06-2016 01:56 PM
    • Replies: 2
    • Views: 133
    05-06-2016, 02:30 PM Go to last post
  44. Chi˛ reasonable?

    Dear Statistic-Professionals, I'm new to statistics and i have got a problem, that i cannot really solve on my own. I hope someone is out there...

    Started by BigBasit‎, 05-05-2016 02:53 PM
    • Replies: 1
    • Views: 191
    05-06-2016, 12:23 AM Go to last post
  45. Standard deviation comparison question

    Two college roommates have each committed to donating to charity each week for the next year. The roomates' weekly incomes are independent of each...

    Started by samuelkim16‎, 05-05-2016 08:14 PM
    ap stats, homework help
    • Replies: 1
    • Views: 184
    05-05-2016, 10:38 PM Go to last post
  46. Question Analysis of covariance (ANCOVA)

    In my research in literature, I read that categorical covariates (eg. sex, race) can be adjusted in the analysis of covariance (ANCOVA), but the...

    Started by Cleliani da Silva‎, 05-04-2016 02:28 PM
    • Replies: 1
    • Views: 126
    05-05-2016, 07:11 AM Go to last post
  47. Component Failure Contributing to System Failure

    I have a system with components A, B, and C. The system operates if components A and C or B and C operate. I need to find the probability that the...

    Started by statssos‎, 05-04-2016 07:16 PM
    • Replies: 0
    • Views: 121
    05-04-2016, 07:16 PM Go to last post
  48. Reliable Change Index

    Hello, If I have a sample of 137 individuals with three assessment results (first, 1YR follow-up and 2-Yr follow-up), can I calculate the Reliable...

    Started by AnneS‎, 05-04-2016 05:18 PM
    • Replies: 0
    • Views: 101
    05-04-2016, 05:18 PM Go to last post
  49. Exclamation Power Analysis

    Hi there, I am currently writing a statistics report which has to cover 2 questions: Firstly, what the correlation is between two different test...

    Started by roseberry‎, 05-04-2016 05:00 AM
    correlation, correlation analysis, post hoc, power analysis, psychology
    • Replies: 0
    • Views: 117
    05-04-2016, 05:00 AM Go to last post
  50. Which test should I use?

    I want to see if the age distribution is the same in my test and control group. First I wanted to do a independent T-test, but my age variant is not...

    Started by June147‎, 05-04-2016 02:40 AM
    • Replies: 0
    • Views: 124
    05-04-2016, 02:40 AM Go to last post
  51. Medical stats - which statistical test to use? Stuck!

    Dear all, I need some help with determining what statistical test to use for the following data. I have a column for age of patient and I want...

    Started by DrHarry‎, 05-02-2016 06:50 PM
    • Replies: 3
    • Views: 226
    05-04-2016, 12:19 AM Go to last post
  52. Matched case-control: Test for baseline characteristics

    Hi, I have a dataset of a matched case-control study with 12 cases. There are two matched controls for each case, totalling 36 subjects....

    Started by teapot‎, 05-03-2016 03:30 AM
    • Replies: 2
    • Views: 166
    05-03-2016, 05:27 PM Go to last post
  53. Comparing % of other studies with your own?

    Hi guys, I'm really sorry if this is in the wrong section. I'm struggling with knowing which test to use or if there is any? I have conducted...

    Started by tc2‎, 05-03-2016 12:14 PM
    • Replies: 1
    • Views: 161
    05-03-2016, 12:56 PM Go to last post
  54. How to deal with unequal survey response rate?

    Hi & thank you all in advance for your help! I sent out a survey to 3 school districts in New York state. District A is large, district B is...

    Started by florencegorgi‎, 05-03-2016 10:35 AM
    • Replies: 3
    • Views: 162
    05-03-2016, 12:12 PM Go to last post
  55. Question A difficult SPSS question

    I have a data set in which household is as a unit (wide format) One of the variable is about relationship between household members, below is the...

    Started by John Miz‎, 05-02-2016 08:47 AM
    • Replies: 0
    • Views: 147
    05-02-2016, 08:47 AM Go to last post
  56. Apriori sample size calculation for mixed ANOVA

    Hello, I'm trying to calculate the required sample size for my study to show significant effects. I'm expecting to analyse my data using a series of...

    Started by cnelson‎, 05-02-2016 06:15 AM
    • Replies: 0
    • Views: 107
    05-02-2016, 06:15 AM Go to last post
  57. T-Test for 2 Independent Means or T Test for 2 Dependent Means

    I am comparing two blood glucose meters. I am using a blood sample from the same finger, at the same time using two different blood glucose meters....

    Started by a1985k‎, 04-30-2016 10:33 PM
    • Replies: 3
    • Views: 203
    05-01-2016, 09:43 PM Go to last post
  58. Which stat test to use?

    I watched two people blink three times a day for seven days. The hypothesis is that they blink significantly more in the morning compared to the...

    Started by humanbeing‎, 04-29-2016 09:32 PM
    • Replies: 7
    • Views: 221
    05-01-2016, 05:04 PM Go to last post
  59. Segmentation analysis: Correct test to use?

    As part of a larger study, we have collected a wealth of data on the interactions customers engage in when buying and using a service. We have...

    Started by Niklas B.‎, 05-01-2016 08:21 AM
    clustering, segmentation
    • Replies: 0
    • Views: 161
    05-01-2016, 08:21 AM Go to last post
  60. Help please- experiment design

    Hi all, I am having real trouble working out the best way to test what I want to test. Bear in mind that what I have to produce is a research...

    Started by Owsley‎, 01-04-2016 09:12 AM
    • Replies: 5
    • Views: 438
    04-30-2016, 11:08 PM Go to last post

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