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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: 197,158
    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: 66,946
    09-30-2005, 09:44 AM Go to last post
  1. Please help my adviser is nuts and my thesis is due

    This is a test to see if Dason views this thread first.

    Started by trinker‎, 09-06-2013 01:14 PM
    • Replies: 4
    • Views: 1,435
    09-06-2013, 03:05 PM Go to last post
  2. Bird watching

    Hey guys I wish to tell which of 2 species is the most common in both abundance and detection. I have data from 60 different sites. In only 4...

    Started by Photosynthesis‎, 09-06-2013 10:52 AM
    • Replies: 0
    • Views: 1,101
    09-06-2013, 10:52 AM Go to last post
  3. ANOVA issue with experimental design

    Hey guys; I am evaluating the effects that various factors may or may not have on the output of a process. Each of the factors has a different...

    Started by yesmanno‎, 09-05-2013 10:39 AM
    anova, experimental design
    • Replies: 3
    • Views: 1,470
    09-06-2013, 07:31 AM Go to last post
  4. Matched pair t test onesided (Minitab)

    I am doing a matched paired t test in Minitab and the assignment is to find whether method A is generates lower test results for a certain test than...

    Started by SandraTP‎, 09-05-2013 03:06 PM
    • Replies: 3
    • Views: 3,888
    09-06-2013, 05:39 AM Go to last post
  5. Red face Analysis of Multiple Sites (vegetation) with multiple categories/ranks - HELP!

    I need some advice (and note, I am NOT a stats pro, excel yes, but have only used SPSS and R once) Short story is, I have done a vegetation survey...

    Started by cbrowne‎, 09-06-2013 02:17 AM
    • Replies: 0
    • Views: 1,088
    09-06-2013, 02:17 AM Go to last post
  6. Critical literature review- lost to how to analyize data from many different sources

    Critical literature review- choose a topic, select many papers (30-50), extract data from papers and critically analyze to determine the overall...

    Started by lesterbird‎, 09-05-2013 10:36 AM
    meta analysis, statistical help
    • Replies: 2
    • Views: 1,430
    09-05-2013, 12:05 PM Go to last post
  7. How to do this question? (Time series analysis and forecasting)

    So you are given the chart in the image.. from 1996 to 2006 and all 4 quarters. 1) Calculate the b0 and b1 for this data. 2) Calculate the...

    Started by juniorkid‎, 09-04-2013 12:02 PM
    • Replies: 1
    • Views: 875
    09-04-2013, 04:52 PM Go to last post
  8. 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: 2,706
    09-04-2013, 03:33 PM Go to last post
  9. Partial eta squared

    For my thesis I need to refer to a document which contains the standards as to which values of partial eta squared are considered low, medium or...

    Started by Pluzan‎, 09-03-2013 05:21 AM
    • Replies: 5
    • Views: 10,215
    09-04-2013, 09:34 AM Go to last post
  10. Is normal dist OK for these count data?

    Hello, I am modelling some count data (ANCOVA). I use R for statistical computing. I am not sure if I must use a glm with poisson errors.

    Started by stweb‎, 09-01-2013 05:43 AM
    ancova, normal, poisson
    • Replies: 3
    • Views: 10,784
    09-03-2013, 05:49 AM Go to last post
  11. Interpreting Results in Primer

    My frequency distribution of R varies from <-0.07 99% <0.10 at 0.1% but the R (Global) is equal 0.484 at 0.1%. what results to consider?

    Started by Albano‎, 09-03-2013 05:37 AM
    • Replies: 0
    • Views: 2,317
    09-03-2013, 05:37 AM Go to last post
  12. Unhappy urgent stats help

    I need some help desperately. I would like to find out whether there is any difference between three conditions using a t test (I dont know if I need...

    Started by ceire‎, 08-30-2013 08:32 AM
    psychology, spss, statistical analysis
    • Replies: 4
    • Views: 1,160
    09-02-2013, 01:49 PM Go to last post
  13. age distribution - obtaining sample accuracy with unevenly populated dataset

    Hi. I'm working on a university research project and want to analyse a dataset but have zero statistics training. The dataset is of several thousand...

    Started by bertiewooster‎, 09-02-2013 08:49 AM
    age distribution
    • Replies: 0
    • Views: 1,409
    09-02-2013, 08:49 AM Go to last post
  14. Lightbulb [XLSTAT] Get a special 15% discount as a Talkstats member!

    XLSTAT is pleased to offer TalkStats members exclusive rates on all orders placed online. Visit www.xlstat.com/en/order and enjoy a 15% discount on...

    Started by quark‎, 11-07-2012 10:53 PM
    • Replies: 1
    • Views: 6,761
    09-02-2013, 06:20 AM Go to last post
  15. Which statistic to prove that one data point dominates the proportions in dataset?

    I'm very new to statistics so apologies if this is a dumb question. I've got a grasp of the concepts but not real-life usage of them (but I am...

    Started by needlesslosses‎, 09-01-2013 07:42 AM
    • Replies: 7
    • Views: 2,834
    09-02-2013, 05:19 AM Go to last post
  16. What methods multivariate could I used?

    Hello everyone, this is my first post and I need the help of all of you. The problem I have, is that I dont knok what multivariate method could I...

    Started by bdra2778‎, 09-01-2013 11:10 PM
    • Replies: 0
    • Views: 1,190
    09-01-2013, 11:10 PM Go to last post
  17. Who is what?

    Hi all This is about interpreting the results of statistical tests. I have a case here where I used Mann-Whitney to see how male and female...

    Started by Mohamed Afifi‎, 08-31-2013 05:48 AM
    • Replies: 4
    • Views: 1,457
    08-31-2013, 10:59 AM Go to last post
  18. Interpreting results of statistical tests; who is what?

    Hi all This is about interpreting the results of statistical tests. I have a case here where I used Mann-Whitney to see how male and female...

    Started by Mohamed Afifi‎, 08-30-2013 06:11 PM
    • Replies: 1
    • Views: 1,451
    08-31-2013, 02:54 AM Go to last post
  19. Unhappy Question of comparing means on repeated measures

    Hi Buddies, I have a trouble on the analysis of the below question, see the attached picture. My interest is whether I can compare the...

    Started by jkck18‎, 08-30-2013 11:56 PM
    • Replies: 0
    • Views: 1,359
    08-30-2013, 11:56 PM Go to last post
  20. Random Sampling Over time to make one random sample?

    Hello everyone. I have an interesting question that was brought to me by a friend and I do not know the "correct" way to do it. Okay so basically,...

    Started by Anotherdream‎, 08-26-2013 06:23 PM
    • Replies: 12
    • Views: 2,915
    08-30-2013, 12:42 PM Go to last post
  21. What technique should you use when a model has 2 dependent variables?

    I have a model with multiple independent variables that influence a dependent variable. The dependent variable than has an effect on another...

    Started by thomas1978‎, 08-30-2013 12:40 PM
    • Replies: 0
    • Views: 991
    08-30-2013, 12:40 PM Go to last post
  22. Wilcoxon rank sum test with binary data

    Hello Everybody, Can the Wilcoxon rank sum test be used when the variable of interest is binary? For example, say I have a control group and a...

    Started by Friday12‎, 08-30-2013 01:13 AM
    nonparametric, rank sum, wilcoxon
    • Replies: 2
    • Views: 3,628
    08-30-2013, 01:33 AM Go to last post
  23. Help with the Beta Distribtuion

    Background: I'm currently trying to learn how to use Bayesian Analysis for split testing two sets of binomial data. (Web analytics, Multi-Armed...

    Started by smithosaurus‎, 08-29-2013 06:34 PM
    bayes, bayesian, beta, distribution, mab
    • Replies: 1
    • Views: 1,268
    08-29-2013, 06:53 PM Go to last post
  24. Combining Symmetrized Percent Change (SPC) values

    Hello Talk Stats members, I'm relatively new to statistics, so please let me know if I'm off course! I was wondering if a total symmetrized...

    Started by Klee‎, 08-28-2013 11:33 AM
    combining, percent change, spc, symmetrized, weighting variables
    • Replies: 1
    • Views: 1,453
    08-29-2013, 06:16 PM Go to last post
  25. average p values???

    I have to compare demographics of a study that was s . In the "pre" group, I have 385 patients, in the post...

    Started by crisisinmedicine‎, 08-29-2013 03:29 PM
    average, chi sq test, chisq, pvalue, stats
    • Replies: 3
    • Views: 2,998
    08-29-2013, 06:06 PM Go to last post
  26. Linear Regression help :D

    Hey guys i was having trouble doing my econometrics homework so i'm going to see if anyone here can help me do this question :D So we have to...

    Started by spoka8‎, 08-29-2013 05:37 AM
    linear regression, prediction, standard error
    • Replies: 1
    • Views: 1,636
    08-29-2013, 10:14 AM Go to last post
  27. Binary Logistic Regressions

    Hello all, I conducted some binary logistic regression analysis for a 'predictors of presence' chapter of my research. However, I've had a...

    Started by cb87‎, 08-28-2013 10:11 AM
    binary linear regression
    • Replies: 3
    • Views: 1,408
    08-29-2013, 09:53 AM Go to last post
  28. Stats tests or transformations on data collected on differing dates - Suggestions?

    Hello and thanks for reading my post. I have two data sets that I would like to compare, but the data that they each contain were collected on...

    Started by northtexas55693‎, 08-29-2013 09:25 AM
    • Replies: 0
    • Views: 886
    08-29-2013, 09:25 AM Go to last post
  29. ordinal independent vaues

    Hello - I have a set of data which consists of prevalence of a disease as a function of age group: 40-49 years - prevalence is .011 (SE .003)...

    Started by birdsong‎, 08-29-2013 08:38 AM
    • Replies: 0
    • Views: 932
    08-29-2013, 08:38 AM Go to last post
  30. can you do a chi sq w/ 2 different n sizes?

    can you do a chi sq w/ 2 different n sizes? I have an experiment with 2 groups (pre medicine and post medicine). Group 1: 400 subjects Group 2:...

    Started by crisisinmedicine‎, 08-28-2013 05:07 PM
    chi sq, excel, pearson, pvalue, stats
    • Replies: 1
    • Views: 1,357
    08-28-2013, 05:51 PM Go to last post
  31. equation needed to create a variable for statistical analysis

    I would appreciated some help on the following: Skewness in outcomes over mean returns How can I form the above in a correctly statistical/...

    Started by magos‎, 08-28-2013 01:40 PM
    • Replies: 0
    • Views: 1,278
    08-28-2013, 01:40 PM Go to last post
  32. Differences between correlation and linear regression

    Hi there i want to know the differences between the correlation level of 2 factors and the R^2 adjusted one Thanks!

    Started by JesusPF‎, 08-22-2013 06:56 AM
    • Replies: 1
    • Views: 1,273
    08-28-2013, 08:56 AM Go to last post
  33. Question Computing confidence for multivariant tests

    We'd like to compute an overall confidence value for a test with multiple variants (sometimes with no control). We've used Student's and Welch's...

    Started by ianmaddox‎, 08-15-2013 06:43 PM
    confidence, significance, t-test
    • Replies: 10
    • Views: 2,544
    08-28-2013, 07:47 AM Go to last post
  34. Binary mixed-model logistic regression using lmer() of lme4 for multilevel analysis

    In my experiment, each patient has been observed twice, once using placebo and the other time using the real treatment. I want to assess the...

    Started by victorxstc‎, 08-24-2013 04:56 PM
    2 Pages
    1 2
    generalized linear model, mixed effects model, mixed effects models, mixed model
    • Replies: 15
    • Views: 11,987
    08-27-2013, 04:07 PM Go to last post
  35. Cox Regression in SPSS - Survival

    How do you get to pick your normal comparitive value for a categorical variable with Cox Regression in SPSS? Example: Categorical Variable...

    Started by pieloch‎, 08-27-2013 03:03 PM
    • Replies: 0
    • Views: 1,331
    08-27-2013, 03:03 PM Go to last post
  36. Comparing distributions

    Hello, I have five sets of discrete data, built from counting experiments. I'll call this sets n_i(x), with i=1,2,3,4,5 and x a discrete...

    Started by giannino‎, 08-27-2013 12:18 PM
    • Replies: 0
    • Views: 1,120
    08-27-2013, 12:18 PM Go to last post
  37. Simple Statistics Review Questions. Please Help

    So i have a review test on monday, and i'm trying to get through these review questions. Unfortunately i have no idea how to do some of these...

    Started by mikey32230‎, 08-25-2013 11:07 AM
    • Replies: 2
    • Views: 5,700
    08-26-2013, 06:37 PM Go to last post
  38. Need help with a Statistics Question...

    A store manager claims that the average age of his customers is less than 40 years old, while the industry average is 40 years old. He asks you to...

    Started by Bjbrooks76‎, 08-26-2013 01:26 AM
    • Replies: 5
    • Views: 2,893
    08-26-2013, 05:00 PM Go to last post
  39. how to identify p-value ranges?

    “The p-value is the area under the curve to the right of the F value. The total area under the F-curve is 1.0" I understand that, in concept. And...

    Started by random512‎, 08-26-2013 09:14 AM
    • Replies: 1
    • Views: 3,429
    08-26-2013, 03:39 PM Go to last post
  40. Trend and seasonality with dummy variables Minitab

    I am doing a statistics course remote and I have some problem with one of my exercises using Minitab. I have a time series over 15 years which...

    Started by SandraTP‎, 08-26-2013 05:54 AM
    • Replies: 2
    • Views: 4,462
    08-26-2013, 12:06 PM Go to last post
  41. Test for equality of relative variances amongst multiple samples

    The data I have can be summarized with the following dummy values. A first type of populations are sampled, producing the following values: ...

    Started by xApple‎, 08-06-2013 02:48 AM
    • Replies: 2
    • Views: 2,202
    08-26-2013, 11:33 AM Go to last post
  42. check for Heteroskedasticity?

    Hi guys, just a quick question - I need to find out whether there is Heteroskedasticity in my data. I did a scatterplot of standardised residuals...

    Started by InneSim‎, 08-26-2013 06:49 AM
    • Replies: 2
    • Views: 1,465
    08-26-2013, 09:26 AM Go to last post
  43. comparing linear models to test for statistical similarities

    I am trying to describe plant growth over time using accumulated temperature (dd) as my independent variable and the plants 'growth stage' (gs) as my...

    Started by catbelize‎, 08-22-2013 10:36 AM
    model comparison, prediction
    • Replies: 4
    • Views: 1,839
    08-26-2013, 05:24 AM Go to last post
  44. About the meaning of significance in SPSS

    Hi, all, I am newbie using SPSS. May be the following question is sort of stupid. But I am trying to sort it out. I do only have high school...

    Started by vd3030‎, 08-20-2013 01:47 AM
    • Replies: 1
    • Views: 3,249
    08-25-2013, 02:51 PM Go to last post
  45. How to report real statistics with meaningful comparison

    Please can you help me I have managed to produce charts using the filter on excel for my survey results. The problem that I am now faced with...

    Started by jellynose‎, 08-24-2013 11:28 AM
    • Replies: 1
    • Views: 1,714
    08-25-2013, 02:06 PM Go to last post
  46. Simple Statistics Review Questions. PART 2

    So i have a review test on monday, and i'm trying to get through these review questions. Unfortunately i have no idea how to do some of these...

    Started by mikey32230‎, 08-25-2013 11:12 AM
    • Replies: 8
    • Views: 2,114
    08-25-2013, 01:43 PM Go to last post
  47. Serial Correlation when testing for cointegration?

    Hello everyone, I am trying to test for cointegration using EG ADF between two variables I(1). The resulting residuals are not stationary and...

    Started by toastintheshell‎, 08-25-2013 10:06 AM
    • Replies: 0
    • Views: 3,077
    08-25-2013, 10:06 AM Go to last post
  48. compare real count to random samples

    Say I have a set of 1470 pairs of peptides. I counted the number of pairs sharing a connection with the same protein and obtained 568. Now I want to...

    Started by statQuery‎, 08-25-2013 09:26 AM
    • Replies: 0
    • Views: 804
    08-25-2013, 09:26 AM Go to last post
  49. Cohen's d, Eta square, and Partial Eta how they are different from each other?

    hi plz tell me what is d, η2 and partial η2? how they are different from each other? thanx in advance

    Started by gksiddiqui‎, 08-21-2013 10:53 PM
    • Replies: 6
    • Views: 4,784
    08-25-2013, 07:34 AM Go to last post
  50. Question on binomial confidence intervals bootstrapping

    I have a binary (male/female) classification problem, for which I am investigating various methods. The primary result is the per cent classification...

    Started by stweb‎, 08-25-2013 06:35 AM
    • Replies: 0
    • Views: 1,267
    08-25-2013, 06:35 AM Go to last post
  51. Simulating Prices in Excel

    Hi, I came across the following Excel formula to simulate daily stock prices: =Start_Price * (1 + NORMINV(RAND(),0,Daily_Price_Volatility)) ...

    Started by GraemeA‎, 08-25-2013 03:25 AM
    • Replies: 1
    • Views: 1,146
    08-25-2013, 05:37 AM Go to last post
  52. De Moivre's Equation The Most Dangerous Equation - Trial of the Pyx

    I don't understand the Trial of the Pyx example in the following (http://press.princeton.edu/chapters/s8863.pdf). De Moivre's Equation...

    Started by randomletters‎, 08-22-2013 02:59 PM
    standard deviation, variability
    • Replies: 1
    • Views: 1,689
    08-25-2013, 02:56 AM Go to last post
  53. Calculating the size of Type 1 error, Type 2 error and power of the test

    Let X have a binomial distribution with parameter n=5 and P\in . The null hypothesis H_{0}:P=\frac{1}{4} is rejected, and The alternative...

    Started by Cynderella‎, 08-24-2013 01:29 AM
    binomial distribution, hypothesis testing, power calculation, type 1 type 2 error
    • Replies: 3
    • Views: 3,510
    08-24-2013, 10:26 AM Go to last post
  54. Coin tossing simulation in R

    I need help with this problem: Toss a fair coin until a head shows up, estimate the expectation of the number of tosses required by simulation....

    Started by violette‎, 08-19-2013 12:47 PM
    • Replies: 13
    • Views: 5,263
    08-24-2013, 10:04 AM Go to last post
  55. [SOLVED] Econometrics - zero mean white noise variance proof

    Hello, Is there somebody who could explain why equation 1 can be reduced to equation 2? I just don't see it ...

    Started by blackreds‎, 08-23-2013 12:53 PM
    • Replies: 4
    • Views: 2,965
    08-23-2013, 01:36 PM Go to last post
  56. I need help with statistics homework........Please

    Can someone please explain this problem to me.. y=3x-5 The graph of any equation that in the form y=mx+b is a straight line. m=3 and b= -5...

    Started by CrystalClear‎, 08-23-2013 10:26 AM
    • Replies: 2
    • Views: 1,891
    08-23-2013, 11:25 AM Go to last post
  57. Binomial probability, Binomial test an Chi-squared test - Help

    Hi, I made a survey to n people asking their sign (12 signs were available). A number k answered Libra. I want to analyze this result. But I'm...

    Started by kepler‎, 08-22-2013 03:30 PM
    • Replies: 2
    • Views: 1,903
    08-23-2013, 05:03 AM Go to last post
  58. Xbar and R Control Chart (mean and standard deviation)

    I'm trying to create a control chart and need help with the mean and standard deviation. I have a sample size n = 7 I found Xbar to be 7805...

    Started by Oceanamie‎, 08-22-2013 12:03 PM
    • Replies: 5
    • Views: 4,296
    08-22-2013, 03:14 PM Go to last post
  59. Question Min sample size for Wilcoxon Rank Sum test

    Hi, I have data measurements (eg, running cost) that keep coming in to the system continuously. There are two groups (say X and Y) that I want to...

    Started by hajjat‎, 08-21-2013 07:07 AM
    power analysis, sample size, sample size determination, wilcoxon rank sum test
    • Replies: 5
    • Views: 7,821
    08-22-2013, 01:00 PM Go to last post
  60. Unbiased estimate of cross-product for unbiased vector

    Let g be an unbiased estimate of a vector G. Can g be used to find an unbiased estimate of the cross product GG′ (where G' is the transpose of G)?...

    Started by Leigh‎, 08-22-2013 12:54 PM
    bias, correction, estimate, matrices, product
    • Replies: 0
    • Views: 1,390
    08-22-2013, 12:54 PM Go to last post

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