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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: 197,097
    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: 66,925
    09-30-2005, 09:44 AM Go to last post
  1. How to compare total weighted average change in average price of many items?

    Hi, I need to compare the average change in prices from 2013 to 2014 for a list of 3000 different products. Below in each spoiler there is...

    Started by fortunesyn‎, 07-10-2014 07:29 AM
    • Replies: 2
    • Views: 1,433
    07-17-2014, 09:06 AM Go to last post
  2. 2 samples t-test: normal or not?

    Hi. For a 2 sample t-test, where I'm checking the assumptions, I'm getting contradictory (at least to me) results regarding normality, between...

    Started by deltango‎, 01-24-2014 08:57 AM
    2 Pages
    1 2
    • Replies: 15
    • Views: 4,191
    07-16-2014, 09:47 PM Go to last post
  3. Interrater Reliability estimate (pearson's r)

    Hi All, I am in need of some help. I am trying to determine the correlation of 5 continuous variables to determine the interrater reliability...

    Started by gradstudent4life‎, 07-16-2014 06:44 PM
    • Replies: 1
    • Views: 7,275
    07-16-2014, 08:11 PM Go to last post
  4. What are the advantages of the mean squared error versus the mean absolute error?

    I understand the formulas for each, but don't understand the advantages of using one over the other. If you could provide a situation that would...

    Started by GreggAlexander‎, 07-15-2014 11:06 PM
    advantage, error metrics, mean absolute error, mean squared error
    • Replies: 2
    • Views: 9,870
    07-16-2014, 10:26 AM Go to last post
  5. Minimal significant difference between two scores

    Hi, I'm presently working on the methodology of a psychological experiment, and I'm having trouble to decide of the best way to choose the...

    Started by Hyruuk‎, 07-16-2014 09:02 AM
    • Replies: 0
    • Views: 1,386
    07-16-2014, 09:02 AM Go to last post
  6. Change scores: t-test or mann-whitney U test ?

    Hi there Nice forum btw. Question: I have change-scores on pain in 37 patients pre/post intervention. which test do you use? t-test or...

    Started by ogcdark‎, 07-16-2014 03:35 AM
    change score, t-test
    • Replies: 1
    • Views: 1,694
    07-16-2014, 06:38 AM Go to last post
  7. Type of a variable

    Good morning dears, Please, I have a question. I am using a variable, which is "Time spent in using a site" which is measured on categories:...

    Started by HadiRabee‎, 07-16-2014 04:07 AM
    • Replies: 0
    • Views: 1,216
    07-16-2014, 04:07 AM Go to last post
  8. Sample size for superiority trial

    Hey statistigeniuses, I would greatly appreciate some advice regarding a trial I am designing. I want to determine the most comfortable among 4...

    Started by icemank‎, 07-15-2014 10:15 PM
    sample size, statistics, superiority trial
    • Replies: 0
    • Views: 1,312
    07-15-2014, 10:15 PM Go to last post
  9. Question how to test (same shape distribution) assumption of Mann Whitney test

    Hello, I want to know how to test ( the same shape distribution) assumption of Mann Whitney test using spss I tried to confirm this assumption by...

    Started by tonia bird‎, 07-15-2014 06:48 PM
    • Replies: 1
    • Views: 1,315
    07-15-2014, 09:02 PM Go to last post
  10. Time series analysis

    I have no experience with time series analysis, but have a dataset that needs attention. I have three years worth of population size estimates at...

    Started by evoeco‎, 07-15-2014 11:09 AM
    • Replies: 5
    • Views: 2,100
    07-15-2014, 06:07 PM Go to last post
  11. mid interval values

    Hi, i'm having trouble finding the correct mean (2.38) and standard deviation(1.54). I think i'm using the incorrect mid interval values. (i used:1 ,...

    Started by stats_problems‎, 07-15-2014 04:09 PM
    • Replies: 0
    • Views: 2,010
    07-15-2014, 04:09 PM Go to last post
  12. Clarification on Error Propagation

    I thought I understood the basic operations for error propagation (addition, multiplication, etc), but I have a few questions: 1. Is variance the...

    Started by chelonidae‎, 07-15-2014 03:32 PM
    confidence intervals, error propagation
    • Replies: 0
    • Views: 836
    07-15-2014, 03:32 PM Go to last post
  13. Adjust Wald Test for Type 1 Error

    Hello All, I am running regression models with a polytomous dummy variable predictor (3 category) in Mplus. I am able to use Wald tests of...

    Started by Ray P.‎, 07-15-2014 12:00 PM
    • Replies: 0
    • Views: 728
    07-15-2014, 12:00 PM Go to last post
  14. KS test, non normality

    We want to compare two continuous variables in R that are not normally distributed. As you can see, both variables contain a lot of zeros, whenever...

    Started by haldelberg‎, 07-15-2014 09:31 AM
    • Replies: 4
    • Views: 2,066
    07-15-2014, 10:24 AM Go to last post
  15. KS Test - help with ties in R

    We are trying to compare two samples that are not normally distributed. We're trying to use the KS test in R, but we get a warning saying that an...

    Started by haldelberg‎, 07-15-2014 08:57 AM
    • Replies: 1
    • Views: 1,252
    07-15-2014, 09:02 AM Go to last post
  16. Datamining - Filters that Correspond to Highest Outcome Variable

    I'm beginning a data analytics project and am curious what the best approach is to handle the following scenario: 1 outcome variable vOutcome...

    Started by bscully‎, 06-30-2014 09:28 AM
    datamine classification
    • Replies: 2
    • Views: 1,096
    07-15-2014, 08:27 AM Go to last post
  17. what test / program do I use?????

    Hi all, This is my first time posting. Im stuck and trying to have someone point me in the right direction. I have a data set from with 9...

    Started by jbone8277‎, 07-14-2014 02:40 PM
    • Replies: 3
    • Views: 1,727
    07-15-2014, 08:04 AM Go to last post
  18. can you compare bland altman plots?

    Hi I want to compare 2 different measurements of the same thing using different devices/methods and have used a bland altman plot to decide if my...

    Started by annapbarnes‎, 07-14-2014 12:07 PM
    • Replies: 3
    • Views: 1,570
    07-15-2014, 06:44 AM Go to last post
  19. Statistical Test for "Ranked" Data

    I'm hoping someone can give me some advice. I have a data set from a survey in which respondents ranked a set of four options. The data looks...

    Started by eBeth‎, 07-14-2014 04:58 PM
    • Replies: 1
    • Views: 1,414
    07-15-2014, 12:00 AM Go to last post
  20. Factor Analysis / PCA with longitudinal data

    Hello, I have a problem which I'm trying to get around... I am trying to conduct a principal component analysis which compares changes in labour...

    Started by TomH83‎, 07-14-2014 04:59 PM
    factor analysis, longitudinal data, pca, sample size
    • Replies: 0
    • Views: 2,673
    07-14-2014, 04:59 PM Go to last post
  21. McNemars Chi squared Test Results

    Hi All, Hope this is the right place. I am QC ing some work of my senior and I am getting some drastically different P values for McNemar's...

    Started by jgibbins123‎, 07-14-2014 02:37 PM
    mcnemar's test, p value
    • Replies: 2
    • Views: 1,734
    07-14-2014, 03:51 PM Go to last post
  22. When I can combine data from two different measurement methods

    Hello I was measure antioxidant capacity with two different methods (ABTS and Chemiluminescence method). Each sample (extract) I was measure twice...

    Started by Now‎, 07-14-2014 02:05 PM
    • Replies: 0
    • Views: 1,157
    07-14-2014, 02:05 PM Go to last post
  23. Multiple regression: must I keep IV that are not correlated to the DV

    Hi everybody :) I have one variable divided in two subscales (so two IV). Only one of them is correlated (<0.3) to the DV. So, in the multiple...

    Started by lgrofils‎, 07-14-2014 06:12 AM
    • Replies: 1
    • Views: 879
    07-14-2014, 10:30 AM Go to last post
  24. Any tool/package for model validation in Logistic Regression?

    Hello! This question is related to an earlier thread of mine about logistic regression modelling. I would like to know if anyone knows any...

    Started by gianmarco‎, 07-14-2014 01:29 AM
    • Replies: 0
    • Views: 1,302
    07-14-2014, 01:29 AM Go to last post
  25. almost sure convergence vs. convergence in probability, practical difference?

    Hello I know the theoretical difference between these two types of convergence. Are the difference important in practice? If you are going to...

    Started by Tarly‎, 07-13-2014 02:22 PM
    • Replies: 2
    • Views: 1,614
    07-13-2014, 04:43 PM Go to last post
  26. Correlation help

    I have a report on correlation due soon and am looking for help as Math is not my forte. I am attempting to find the correlation between Marathon...

    Started by Yaro567‎, 07-12-2014 02:13 PM
    • Replies: 12
    • Views: 2,588
    07-12-2014, 09:50 PM Go to last post
  27. Help! t-test hypothesis

    Hi, Please help me q)The data below are the random sample of 10 banks chosen randomly. The data shows average earning per share in year 2001 and...

    Started by Shashank Prasad‎, 07-05-2014 02:41 PM
    • Replies: 1
    • Views: 2,643
    07-12-2014, 06:39 PM Go to last post
  28. Proving R squared as explained to total variance

    How do you show that the square of the correlation coeeficient is the ratio of explaiend to total variance?

    Started by Steve Eastman‎, 07-11-2014 09:19 AM
    • Replies: 1
    • Views: 1,398
    07-12-2014, 03:25 PM Go to last post
  29. p value. tukey's test

    hi every one I'm new to the forum as well as to statistics... and i really appreciate any help! my problem is: I can't figure out where that...

    Started by blue_clouds_mountain‎, 07-11-2014 10:39 AM
    • Replies: 5
    • Views: 2,787
    07-12-2014, 03:19 PM Go to last post
  30. Help with t-test and multiple variables

    Hello We are working with a large set of data from pigs at slaughter in R. We have info on the gender of pigs and of the occurrence of specific...

    Started by haldelberg‎, 07-11-2014 12:06 PM
    • Replies: 2
    • Views: 1,525
    07-11-2014, 03:04 PM Go to last post
  31. Use of letters to show difference between 2 groups of means ?

    Hello, I hope everyone is doing well ! So, I want to ask you a question about mean comparison from statistics perspective ! well ! I have a...

    Started by expressomar‎, 07-06-2014 10:24 AM
    • Replies: 7
    • Views: 1,424
    07-11-2014, 07:58 AM Go to last post
  32. Large samples from non normal population

    Hello, I have two questions I am trying to do since yesterday. For some reason I just don't get them. I tried calculating but my answers are very...

    Started by Aspire‎, 07-10-2014 06:07 AM
    • Replies: 0
    • Views: 2,565
    07-10-2014, 06:07 AM Go to last post
  33. Cross-Lagged-Correlation with nominally scaled data

    Dear all, I am doing a small agenda study for my thesis. My research question is: Does the financial reporting of Outlet A at Time1 influence the...

    Started by sabd‎, 07-10-2014 05:33 AM
    • Replies: 0
    • Views: 1,311
    07-10-2014, 05:33 AM Go to last post
  34. How to compare groups with multiple categorical variables

    Hi: I need to compare to compare two groups with multiple categorical variables_ I cannot quite figure out how to do it in one analysis: i am...

    Started by alixlaferri‎, 07-09-2014 11:03 PM
    • Replies: 0
    • Views: 1,884
    07-09-2014, 11:03 PM Go to last post
  35. Find xbar - Hypothesis Testing

    I have a question I'm stuck on: You are given the following hypotheses: Ho: m = 34, Ha: m > 34 sd = 10 n = 65 What would the sample mean...

    Started by houstonrob‎, 07-09-2014 09:40 PM
    find mean, hypothesis testing, p-value
    • Replies: 1
    • Views: 2,314
    07-09-2014, 09:58 PM Go to last post
  36. Post Life table help

    We are provided with the values for Qx (age specific mortality rate for a species/year) and mx (offspring produced per female/yr) and then shown a...

    Started by Davoo‎, 07-09-2014 05:55 PM
    • Replies: 0
    • Views: 1,530
    07-09-2014, 05:55 PM Go to last post
  37. Test of equal variance

    when to perform test for equal variance, is it necessary to perform "Test of equal variance" before performing One Way AVAONA

    Started by anurag‎, 07-09-2014 09:13 AM
    anova, test of equal variance
    • Replies: 3
    • Views: 1,686
    07-09-2014, 01:35 PM Go to last post
  38. Two Sample t test for Unequal Sample Sizes

    Which Two sample t test should be used when my sample size is small say < 20 and sample size is also different n1 = 15, n2 = 5

    Started by Mukesh‎, 07-08-2014 05:10 AM
    • Replies: 1
    • Views: 1,858
    07-09-2014, 02:35 AM Go to last post
  39. Quantitative+ Qualitative Variable. Wich Test?

    Hi everybody, I have two tables. Each one contains a set of factors (quantitative variables) measured on 32 samples. The last column of this table...

    Started by Ramo‎, 07-08-2014 04:36 PM
    • Replies: 0
    • Views: 1,221
    07-08-2014, 04:36 PM Go to last post
  40. Parameters estimation.

    It is known that a sample consisting of the values 12, 11.2, 13.5, 12.3, 13.8 and 11.9 comes from a population with density functionf (x, α, β) = (...

    Started by camilaberas‎, 07-08-2014 11:52 AM
    estimation, statistic
    • Replies: 1
    • Views: 1,698
    07-08-2014, 12:47 PM Go to last post
  41. Monte Carlo simulation for interviewing data?

    Hello everyone, I have interviewing data that includes interviewers' ratings of applicants and job performance ratings. I would like to test how...

    Started by goodned‎, 07-08-2014 11:29 AM
    monte carlo
    • Replies: 0
    • Views: 1,128
    07-08-2014, 11:29 AM Go to last post
  42. Interpreting Binary Logistic Regression

    Hi, This is my first time on this forum so I don't really know how this works. For this reason I will try to explain my problem as extensive as...

    Started by Maartenvb‎, 07-04-2014 06:50 AM
    • Replies: 8
    • Views: 2,340
    07-08-2014, 05:58 AM Go to last post
  43. Friedman ANOVA significant but post hoc tests not

    Hi, Would be very grateful if anyone could shed some light onto my stats. I have 3 different methods which i am testing on the same 4 users. My...

    Started by s-gomez‎, 07-08-2014 05:57 AM
    friedman, wilcoxon
    • Replies: 0
    • Views: 2,484
    07-08-2014, 05:57 AM Go to last post
  44. Analysing repeated Chi.squares

    Hi, I'm testing whether a certain species of insect prefers a high or low concentration of a certain substance. I've trapped a few hundred using...

    Started by Lutrine‎, 07-08-2014 05:38 AM
    • Replies: 0
    • Views: 1,012
    07-08-2014, 05:38 AM Go to last post
  45. Survival analysis

    Hi all, I have a question regarding survival analysis. As part of my research paper, I need to show the relationship between two numerical...

    Started by Emma93‎, 07-08-2014 02:38 AM
    • Replies: 2
    • Views: 1,096
    07-08-2014, 03:12 AM Go to last post
  46. Maximum likelihood estimator in linear model

    Consider two simple linear models. y_{1j}=\alpha _1+\beta_{1}x_{1j}+\epsilon_{1j} and y_{2j}=\alpha _2+\beta_{2}x_{2j}+\epsilon_{2j} ,...

    Started by Clarkson‎, 07-07-2014 08:25 AM
    • Replies: 3
    • Views: 1,958
    07-08-2014, 02:42 AM Go to last post
  47. Finding a UMVUE for variance of normal distribution

    Let Let X_1,X_2,...,X_n be a random sample from a normal distribution with mean \mu and variance \sigma^2 . I showed that (\bar X,S^2) is...

    Started by Clarkson‎, 07-07-2014 08:10 PM
    estimation, inference, normal distribution, variance estimation
    • Replies: 1
    • Views: 6,953
    07-08-2014, 02:33 AM Go to last post
  48. Correction factor for retransforming data from a mixed effect model

    Hi, I have read that if you use regression analysis for predictive modelling there is a bias when transforming logarithmic data back to its...

    Started by LUM‎, 07-08-2014 01:13 AM
    • Replies: 0
    • Views: 1,226
    07-08-2014, 01:13 AM Go to last post
  49. principal component analysis - right choice & interpretation

    Hi everyone, I'm kinda stuck with a problem. I am building a scoring model with 14 different factors. Here my first question: as it's not a...

    Started by ferschdenix‎, 07-07-2014 06:01 PM
    component matrix, factor analysis, principal component, spss
    • Replies: 0
    • Views: 1,709
    07-07-2014, 06:01 PM Go to last post
  50. simple or multiple regression. Help PLEASE :)

    Hello everybody, Hope you could help me in this matter... I have four independant variables mesured using a likert scale: Knowing-why,...

    Started by lgrofils‎, 07-03-2014 09:03 AM
    • Replies: 2
    • Views: 1,834
    07-07-2014, 02:38 PM Go to last post
  51. Correllation between variables (categorical and non-categorical)?

    Dear all, I have a rather basic question that I hope some of you know the answer to. I have got two variables that we investigated using linear...

    Started by drkoch‎, 07-07-2014 01:27 AM
    • Replies: 3
    • Views: 1,181
    07-07-2014, 09:39 AM Go to last post
  52. Basic Statistic Question dealing with different factors affecting a response

    Hello all... This should be a simple question but I can't seem to figure out what to exactly use. Here is my problem: I have a about 6...

    Started by ilikeshirt‎, 06-24-2014 03:59 PM
    • Replies: 11
    • Views: 2,017
    07-07-2014, 08:18 AM Go to last post
  53. Analysing questionnaire responses: which test to use for my data?

    Hi, I have some questionnaire data, and I'm wondering how best to analyse it. Basically, patients and companions were asked to rate themselves on...

    Started by cls1‎, 07-04-2014 08:30 AM
    • Replies: 4
    • Views: 1,687
    07-07-2014, 05:34 AM Go to last post
  54. Question Continuous vs Discrete variables: Special case of lead time

    Hi all, Firstly a warning that I may come off as a total noob. So please bear with me. :D Lead Time is the time between placing an order and...

    Started by manujosephv‎, 07-07-2014 04:50 AM
    • Replies: 0
    • Views: 1,182
    07-07-2014, 04:50 AM Go to last post
  55. Question Redundancy Analysis - how to interpret the plot

    I'm reading a paper that uses a redundancy analysis but I don't know how to interpret the figure. It seems like such a basic thing that I should...

    Started by Joli‎, 07-06-2014 08:43 AM
    • Replies: 0
    • Views: 2,080
    07-06-2014, 08:43 AM Go to last post
  56. Need Help: T - Test Hypothesis testing

    Hi, Am I correct: q)A survey claims that there is difference in the income of people between the city A and city B. To test the claim people...

    Started by Shashank Prasad‎, 07-05-2014 02:07 PM
    • Replies: 0
    • Views: 1,565
    07-05-2014, 02:07 PM Go to last post
  57. Need help to solve Hypothesis test questions!!

    Hi, Please tell me if my procedure/concept involved in solving these questions is correct or not q1)A cold beverage company is concerned about...

    Started by Shashank Prasad‎, 07-05-2014 01:36 PM
    • Replies: 0
    • Views: 3,796
    07-05-2014, 01:36 PM Go to last post
  58. Non probability quota sampling help for my dissertation please! :)

    Here is the situation: ​ I am doing a survey to collect opinion of existing customers of a brand. Hence i am using their database. My research is...

    Started by klau90‎, 07-03-2014 04:32 AM
    non-probability sampling, quota sampling
    • Replies: 0
    • Views: 1,334
    07-03-2014, 04:32 AM Go to last post
  59. Mann-Whitney U Test: Ordinal data with few categories

    Hello, I am trying to use the Mann-Whitney U Test to compare ordinal data between 2 groups, but the problem is that there are only 3 categories...

    Started by jwoo94‎, 06-30-2014 02:28 PM
    mann-whitney, ordinal data
    • Replies: 12
    • Views: 3,837
    07-02-2014, 10:03 PM Go to last post
  60. Given A Confidence Interval And Sample Size, How do I Calculate Mean And SD?

    Given: 9 women yielded a 90% confidence interval of 1,077 units to 1,123 units. How do I calculate the mean and standard deviation from this...

    Started by dorkboy‎, 06-30-2014 08:02 AM
    • Replies: 2
    • Views: 2,885
    07-02-2014, 03:06 PM Go to last post

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