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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: 197,080
    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: 66,915
    09-30-2005, 09:44 AM Go to last post
  1. Statistical Test for differences Across time Between Independent Groups

    Hello everyone. I am trying to determine if there is a statistical model that would allow someone to test for differences between two different...

    Started by Anotherdream‎, 04-09-2014 03:37 PM
    • Replies: 6
    • Views: 1,679
    04-10-2014, 07:04 PM Go to last post
  2. correlating many time series to find functional pairs

    Hi there, I'm a neuroscientist in deep water, trying to do things that aren't standard in my field. I have a strong feeling there are established...

    Started by BrainDr‎, 04-10-2014 06:42 PM
    correlation matrix, correlations; time series, multivariate tests, neural networks, weighted data
    • Replies: 0
    • Views: 945
    04-10-2014, 06:42 PM Go to last post
  3. Trouble with determining the probability of exceding some extreme value

    I fitted a normal distribution to my dataset of N=200 lengths. The chi-square test shows it's a pretty good match. I intended to use this normal...

    Started by maq‎, 04-07-2014 09:38 AM
    • Replies: 10
    • Views: 1,538
    04-10-2014, 12:10 PM Go to last post
  4. comparing inter-individual differences - difference across values within a group

    Hello! I am trying to find a way to determine whether there is a statistical difference between learning rates across 8 individuals. I read about...

    Started by ishtar_gabry‎, 04-10-2014 07:34 AM
    • Replies: 0
    • Views: 1,417
    04-10-2014, 07:34 AM Go to last post
  5. Removing the affect of a set on a different set

    Hey all, First time here, not a native English speaker and in no way a statistician, so please pardon for any ignorance I might exhibit :) As a...

    Started by Dadi‎, 04-08-2014 08:49 AM
    • Replies: 6
    • Views: 1,377
    04-10-2014, 05:20 AM Go to last post
  6. critical values

    Hi everybody, I am working on a significance test and trying to compute p-values or the corresponding critical values. I want to carry out a...

    Started by tr206‎, 04-09-2014 01:50 PM
    • Replies: 2
    • Views: 1,017
    04-10-2014, 02:34 AM Go to last post
  7. When can the normal be used to approximate the hyperGeometric?

    Hello all. I know the normal can be used to approximate the binomial when p is not close to 0 or 1, and when the population is extremely large...

    Started by Anotherdream‎, 04-09-2014 07:40 PM
    • Replies: 0
    • Views: 1,487
    04-09-2014, 07:40 PM Go to last post
  8. Linear Mixed Models

    In Laird & Ware (1982) , Yi : (ni * 1) response vector, so is this vector a multivariate response for one subject ? Could someone give me an...

    Started by seeker2013‎, 04-09-2014 05:17 PM
    • Replies: 1
    • Views: 1,350
    04-09-2014, 06:28 PM Go to last post
  9. [SOLVED] Better way to display indicator function.

    I have an indicator function I am displaying in an R manual. I am trying to make it as one line (and more readable) so it looks good in the HTML...

    Started by trinker‎, 04-09-2014 11:08 AM
    equation, indicator function
    • Replies: 5
    • Views: 1,668
    04-09-2014, 12:56 PM Go to last post
  10. Interpreting PCA Outputs

    Hi All, I'm really hoping someone can help me. My brain seems incapable to properly interpreting the output of PCA analysis. I'm sure I won't be...

    Started by terribleatstats‎, 04-09-2014 08:38 AM
    • Replies: 0
    • Views: 1,262
    04-09-2014, 08:38 AM Go to last post
  11. Multiple Linear Regression - really need help

    Hi, I'm going out of my mind...really need help. I have one continuous dependent variable (test scores) and 6 categorical (with 2 categories -...

    Started by 101lou‎, 04-02-2014 03:30 PM
    • Replies: 8
    • Views: 2,348
    04-08-2014, 11:01 PM Go to last post
  12. Which model would be best to do this

    Hello everyone. I have been given a data set and tasked with coming up with a way to compare different people (real estate professionals) to each...

    Started by Anotherdream‎, 04-08-2014 10:49 PM
    • Replies: 0
    • Views: 914
    04-08-2014, 10:49 PM Go to last post
  13. Regression on multiple distributions within one dataset

    Hello everyone. I am attempting to do a regression analysis on the sales price of a property. I have several variables of interest. The main ones...

    Started by Anotherdream‎, 04-08-2014 10:44 PM
    • Replies: 0
    • Views: 1,393
    04-08-2014, 10:44 PM Go to last post
  14. Multivariate analysis and survival

    Dear Friends, I needed a help in deciding the right test using SPSS and how to do it please. I am comparing survival of two different cancers....

    Started by Irshad‎, 04-08-2014 09:48 PM
    • Replies: 0
    • Views: 1,046
    04-08-2014, 09:48 PM Go to last post
  15. Need help on mutliple regression analysis output in minitab

    Gentlemen\Ladies I need some expertise view on the regression analysis output i've been recieving..i am not a stat genious but i use minitab to...

    Started by sandeepvarma‎, 04-08-2014 12:43 PM
    • Replies: 1
    • Views: 1,060
    04-08-2014, 07:06 PM Go to last post
  16. Factorial Experiments

    Hello if you can take a look at this assignment to better understand what I am talking about: http://imgur.com/xypjFHS From what I understand I...

    Started by bigbob‎, 04-08-2014 06:48 PM
    • Replies: 0
    • Views: 889
    04-08-2014, 06:48 PM Go to last post
  17. Satterwaite approx -- utterly confused!

    So I was reading this article: http://wolfweb.unr.edu/~ldyer/classes/396/PSE.pdf and it made perfect sense -- that the approximation is used...

    Started by Ker‎, 04-08-2014 04:30 PM
    • Replies: 0
    • Views: 1,174
    04-08-2014, 04:30 PM Go to last post
  18. Unhappy Help! What statistical test should I use?

    First, Iím sorry if I make a lot of mistakes ; English is not my first language :S Iím a bit lostÖ I made a questionnaire on homophobic...

    Started by Marzipan‎, 04-08-2014 01:26 PM
    • Replies: 1
    • Views: 806
    04-08-2014, 04:11 PM Go to last post
  19. one way anova vs. multiple comparisons

    I'm using matlab to study significance different in mean for deviation in the thre directions 8vrt, lng and lat). with one way anova i get no...

    Started by fatma123‎, 04-08-2014 11:07 AM
    anova, multiple comparisons
    • Replies: 1
    • Views: 1,018
    04-08-2014, 12:08 PM Go to last post
  20. Best statistical method for the following data set?

    Hello everyone I need to compare the inventory of supplies used for the same medical procedure at two different hospitals. Not all supplies are...

    Started by Milesb0425‎, 04-08-2014 11:22 AM
    • Replies: 2
    • Views: 1,179
    04-08-2014, 12:03 PM Go to last post
  21. non linear regression

    hi, I want to estimate quasi hyperbolic discounting model: x= b* (1/(1+r)^t) *y where b and r are my parameters and i want to estimate them...

    Started by archana‎, 04-08-2014 07:37 AM
    • Replies: 1
    • Views: 806
    04-08-2014, 08:39 AM Go to last post
  22. Probability

    Question 1 Consider the following frequency table with scores on a variable X of individuals from a population. X Frequency of X 2 ...

    Started by Tadele‎, 04-08-2014 07:33 AM
    • Replies: 1
    • Views: 823
    04-08-2014, 07:58 AM Go to last post
  23. Exclamation Repeated measures help! (Friedmans Test)

    ............

    Started by LavaLamp‎, 04-08-2014 05:17 AM
    friedman test, non-parameteric, repeated measures, wilcoxon-test
    • Replies: 1
    • Views: 1,205
    04-08-2014, 05:39 AM Go to last post
  24. Determining the right test????

    Hello all, I am designing a study for my beginning stats class and can't decide what type of test I should use. I am planning to assess 2...

    Started by kkdd‎, 04-07-2014 04:28 PM
    • Replies: 1
    • Views: 1,139
    04-08-2014, 12:38 AM Go to last post
  25. Non-parametric test for trend suggestions needed

    Hello, I am conducting trend analysis on rainfall time series using the Mann-Kendall rank correlation coefficient (tau). I would like to also use...

    Started by cohara‎, 04-07-2014 07:32 AM
    mann-kendall, non-parameteric, spearman's rho, trend analysis
    • Replies: 2
    • Views: 1,748
    04-07-2014, 10:46 PM Go to last post
  26. Could you give me the lowdown on psychology and large samples?

    I vaguely remember reading that given a large enough sample size any effect can be shown in psychology--is this true? Or at least I read a few snarky...

    Started by TheMonk‎, 04-02-2014 12:28 PM
    • Replies: 5
    • Views: 1,640
    04-07-2014, 08:04 PM Go to last post
  27. How to average coefficients' standard errors?

    Hi, I'm considering a "mean-group"-estimator, where the estimated coefficients are unweighted means of multiple regressions from different groups....

    Started by ladf‎, 04-03-2014 01:21 PM
    • Replies: 14
    • Views: 2,853
    04-07-2014, 02:56 PM Go to last post
  28. testing for heteroskedasticity

    In a thesis is it best to report the heteroskedasticity of the initial data, test the entire model or both? ie: Model: Breusch-Pagan /...

    Started by ineedhelpineedhelp‎, 04-06-2014 11:41 AM
    • Replies: 4
    • Views: 2,616
    04-07-2014, 01:24 PM Go to last post
  29. Scatter Plot showing extra variable via point intensity?

    Hi, I'm new to this forum, and am a scientist not a statistician, so I apologise for any incorrect terminology! I'm trying to do a scatter plot,...

    Started by JB70‎, 04-07-2014 06:58 AM
    • Replies: 2
    • Views: 2,844
    04-07-2014, 07:34 AM Go to last post
  30. Help understand probability in a simply random sample

    Quoted is an extract for Sample Survey Principles and Methods, Vic Barnett(2002) Pg 34 The concept of probability averaging only arises in...

    Started by sid9221‎, 04-07-2014 06:56 AM
    probability, sampling
    • Replies: 0
    • Views: 952
    04-07-2014, 06:56 AM Go to last post
  31. 'Alternate' proof that the expected value of the sample mean is the population mean

    It would be appreciated if someone could verify that this makes sense. By definition \bar{x} = \frac{\sum x_i}{n} So taking its expectation we...

    Started by sid9221‎, 04-06-2014 10:34 AM
    expected value, sampling
    • Replies: 3
    • Views: 3,097
    04-06-2014, 03:35 PM Go to last post
  32. Checking for difference between respondents and sample population

    Hi there, I am working on an evaluation. The study population is 3,000 participants. We completed surveys with 81 percent of of particpants (2,430...

    Started by stharrington‎, 04-06-2014 09:53 AM
    • Replies: 0
    • Views: 839
    04-06-2014, 09:53 AM Go to last post
  33. central tendency and dispersion

    Letís assume you have a population of 2000 beers of different brands and whose mean level of tastiness is 8.5 (on a scale from 1 to 10 ) with a...

    Started by carlos‎, 04-06-2014 07:05 AM
    • Replies: 0
    • Views: 873
    04-06-2014, 07:05 AM Go to last post
  34. Using a Wilcoxon Signed-Rank test on three treatments in Excel

    Hi all, I conducted an insurance game for my experimental econ class where buyers decide to either buy or not buy, and sellers decide to either...

    Started by SoConfused‎, 04-05-2014 09:00 PM
    • Replies: 0
    • Views: 1,555
    04-05-2014, 09:00 PM Go to last post
  35. ACF graph output -> how to proceed

    I intend to use a dummy variable model to test the significance of the dummies. Looking at the ACF/PACF data, the autocorrelation never 'slopes off'...

    Started by ineedhelpineedhelp‎, 04-05-2014 12:35 PM
    • Replies: 1
    • Views: 1,406
    04-05-2014, 08:38 PM Go to last post
  36. Help with proof that expected value of x_i is the populaton mean X bar

    I'm having a little trouble with the proof that the expected value of x_i is \bar{X} . What I have is E=\sum_{j=1}^{N}X_j Pr(x_i=X_j) ...

    Started by sid9221‎, 04-05-2014 12:50 PM
    expectation, simple random sample
    • Replies: 6
    • Views: 1,304
    04-05-2014, 04:19 PM Go to last post
  37. Assumption of Normality

    Is the normality regression assumption that the sample data is normally distributed or that the residuals are? In a thesis is it worth reporting on...

    Started by ineedhelpineedhelp‎, 04-05-2014 02:07 PM
    • Replies: 1
    • Views: 1,358
    04-05-2014, 02:10 PM Go to last post
  38. Question Can correlation be read by two 1-dimensional graphs?

    Let's say we either want to look at empirical correlation, or theroeatical between two random variables. Can this be found be examining the two...

    Started by Tarly‎, 04-05-2014 11:21 AM
    • Replies: 4
    • Views: 962
    04-05-2014, 11:43 AM Go to last post
  39. Variance Homogeneity Tests from Summary Data

    Hello all, is it possible to test for equal variances given summary data (i.e. only n, mean, and standard deviation) as the input? If so, what is the...

    Started by b.r10‎, 04-04-2014 06:01 PM
    • Replies: 3
    • Views: 1,538
    04-05-2014, 10:47 AM Go to last post
  40. Two questions about appropriate tests

    Hi, I'm an undergrad student in the uk struggling to answer one simple question and one slightly more complex one. Any help on this would be deeply...

    Started by unloop‎, 04-05-2014 05:41 AM
    • Replies: 1
    • Views: 1,176
    04-05-2014, 07:03 AM Go to last post
  41. (3x4) 2way anova

    Hi there. I have a problem with conducting the 3x4 anova test. I have two independent variables - data through 3 years divided into 4 seasons...

    Started by ivn‎, 04-04-2014 01:50 PM
    • Replies: 7
    • Views: 3,436
    04-05-2014, 06:28 AM Go to last post
  42. RSD of multiple samples

    Hello! This is probably a very basic question, so here goes! I am supposed to calculate the RSD of some tests i did in chemistry. The sample...

    Started by Soeta‎, 04-04-2014 09:04 AM
    • Replies: 2
    • Views: 1,599
    04-05-2014, 06:23 AM Go to last post
  43. Adjustment for multiple comparisons

    Hi there I am hoping you can help me out with a confusing topic. I have a 2x3x4 repeated measured anova. I have a significant 3-way interaction,...

    Started by physiologist101‎, 09-03-2013 12:51 PM
    anova, bonferroni
    • Replies: 5
    • Views: 3,009
    04-05-2014, 04:17 AM Go to last post
  44. 2-way ANOVA and the post tests

    Hi everyone :) I was wondering if you could help me with a question which should be simple... but the more I am trying to figure it out, the more...

    Started by in4eto‎, 04-04-2014 05:45 PM
    anova, bonferroni, significance
    • Replies: 0
    • Views: 1,697
    04-04-2014, 05:45 PM Go to last post
  45. Post-hoc analysis for Fisher's Exact Test

    Hello all! I am using Fisher's Exact Tests to analyse a series of 2x2 contingency tables with small values. But are there any other tests I can...

    Started by nylon88‎, 04-04-2014 11:52 AM
    fishers, fishers exact, ordinal data, post-hoc
    • Replies: 4
    • Views: 4,179
    04-04-2014, 03:40 PM Go to last post
  46. Exclamation Please Help!!! Midterm Exam at university

    Dear forum members I have a midterm this monday at my university and me and my friends can't come up with a result, we have tried everything, i...

    Started by vect‎, 04-04-2014 10:33 AM
    • Replies: 2
    • Views: 1,044
    04-04-2014, 03:23 PM Go to last post
  47. Theoretical questions about Chi goodness of fit & Fisher's Exact tests

    Hello statisticians, My main questions are; 1) For a Chi goodness of fit test, which effect size do you use? I am being told Cramer's V, Phi,...

    Started by nylon88‎, 04-04-2014 01:36 PM
    chi-square, contingency tables, fishers exact, goodness of fit, post-hoc
    • Replies: 5
    • Views: 2,646
    04-04-2014, 03:06 PM Go to last post
  48. *Novice* Which test? Is one even possilble

    Hi Everyone, I am a complete novice to the world of statistics and I'm not the best mathematician. I have the data of three different city...

    Started by rowhi‎, 04-04-2014 09:44 AM
    • Replies: 2
    • Views: 1,745
    04-04-2014, 12:38 PM Go to last post
  49. Accounting for Pre-existing differences between Control and Treatment groups

    I've got two sets of sales data. I want to compare the two groups after one has a sales program applied to it. However, the treatment group already...

    Started by fatso101‎, 04-03-2014 05:08 PM
    normalization, standardization
    • Replies: 3
    • Views: 1,429
    04-04-2014, 10:30 AM Go to last post
  50. planned comparisons - contrast coefficients - trends

    Hello! Iím going to conduct planned comparisons with contrast analysis in ANOVA. In particular I am interested in trend analysis. The problem is...

    Started by mcdomell‎, 04-04-2014 10:12 AM
    contrast coefficients, planned comparisons, trend analysis
    • Replies: 0
    • Views: 1,031
    04-04-2014, 10:12 AM Go to last post
  51. Which Test?

    Hi, I came across a question in the college. The scores awarded to 10 contestants in a competition by three judges were given. We had to use some...

    Started by C2H6O‎, 04-04-2014 08:39 AM
    • Replies: 0
    • Views: 1,118
    04-04-2014, 08:39 AM Go to last post
  52. Dummy variable model problems

    My model is as follows: y = b1Jan + b2Feb + ..... + b12Dec + X + et Info: Without omitting the constant I have to omit one of the monthly...

    Started by ineedhelpineedhelp‎, 04-03-2014 10:04 PM
    • Replies: 1
    • Views: 1,084
    04-04-2014, 04:41 AM Go to last post
  53. Help w/ Choosing Correct Statistical Test

    Hi everyone, I was wondering if anybody could help me figure out the right statistical test for my study... I have 2 independent populations of...

    Started by kaycee08‎, 04-03-2014 01:39 PM
    • Replies: 6
    • Views: 2,291
    04-03-2014, 06:59 PM Go to last post
  54. Regression analysis or ANOVA for unequal sample sizes

    Hello everyone :) First I want to apologize for my Eniglish, Iīm not a native speaker. I am currently working on a research for school...

    Started by Wicked Ginger‎, 04-03-2014 07:17 AM
    anova, regression analysis, spss, two-way anova, unequal sample size
    • Replies: 4
    • Views: 4,245
    04-03-2014, 01:27 PM Go to last post
  55. Standardizing or normalizing two different sales variables before regression?

    Hello there :wave:, I'm currently involved in research, but I have to admit that I'm quite insecure in my math / statistics abilities, which is...

    Started by almostthere‎, 04-03-2014 09:43 AM
    normalize dataset
    • Replies: 0
    • Views: 2,583
    04-03-2014, 09:43 AM Go to last post
  56. Question Are McNemar's and Binomial the right tests for my data

    Hi everyone. I have performed an experiment, where I have real and synthesised movie data. My participants were shown either a real movie, or a...

    Started by shaw2thefloor‎, 04-03-2014 07:20 AM
    binomial, chi sq test, mcnemar, turing test
    • Replies: 2
    • Views: 905
    04-03-2014, 08:20 AM Go to last post
  57. Question The rationale behind bootstrap percentile interval?

    When we create a confidence interval for our parameter, using a bootstrap percentile interval, , we find the empirical percentiles of the bootstrap...

    Started by Tarly‎, 04-02-2014 01:38 PM
    • Replies: 7
    • Views: 2,047
    04-03-2014, 08:12 AM Go to last post
  58. Sampling with or without replacement

    I'm having some problems understanding the implications of sampling with replacement or sampling without replacement. I understand that if you...

    Started by sylvia‎, 03-29-2014 07:48 AM
    • Replies: 5
    • Views: 1,958
    04-03-2014, 02:37 AM Go to last post
  59. Please help! (SEM-related)

    I am trying to assess the associations between my control variables (covariates) and 4 latent constructs, so that I can decide which ones to include...

    Started by CCmomof5‎, 04-01-2014 10:00 PM
    • Replies: 3
    • Views: 1,939
    04-02-2014, 11:38 PM Go to last post
  60. Paired T Test or One Way ANVOA

    Hi, I'm trying to analyse data from a small sample size (10 people) but not sure which test I should use. my data is based on having asked the...

    Started by midnitz7‎, 04-02-2014 03:35 PM
    • Replies: 1
    • Views: 866
    04-02-2014, 03:41 PM Go to last post

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