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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: 66,905
    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: 24,771
    09-30-2005, 09:44 AM Go to last post
  1. Question Statistical Analysis on Diets - Anyone a fan of Nutritional Sciences? :)

    Hello, My study is composed of 4 diets. One is control and the others are 3 different types of fiber. I have a total of 3 subjects for this study....

    Started by TimTim‎, Today 04:04 AM
    • Replies: 6
    • Views: 104
    Today, 09:22 AM Go to last post
  2. Maximum Likelihood Estimator - Geometrical Distribution

    Do you know a site which gives a step by step solution of finding the MLE for Geometric Distribution? I'm thinking about something like this...

    Started by StatsBeginner‎, Today 09:21 AM
    maximum likelihood
    • Replies: 0
    • Views: 18
    Today, 09:21 AM Go to last post
  3. Looking for datas

    Hello, Does somebody know where I can find the mensual evolution of temperature in France from 2000 to 2014 ? Thank you

    Started by roukyno1‎, Yesterday 09:38 AM
    • Replies: 1
    • Views: 108
    Today, 03:27 AM Go to last post
  4. [ HELP] Employees Absence

    Hi everyone, I need a basic procedural help here. I have to analyze the employees absence in a manufacturing firm. I was given the data of...

    Started by klincired‎, 07-22-2014 10:42 PM
    • Replies: 7
    • Views: 117
    Today, 02:13 AM Go to last post
  5. Help with choosing the right analysis and how to manage a gender-matching variable

    Hi there, Thanks for taking the time to read my question, it is very specific and based on a particular problem I've never come across before. ...

    Started by Helen‎, Today 01:42 AM
    gender, moderated multiple regres, regression help, stats help
    • Replies: 0
    • Views: 39
    Today, 01:42 AM Go to last post
  6. Evaluating Ranked lists

    Hi, I implemented ranking algorithm to rank relevant documents to a given topic. So the algorithm produces ranked list of documents for each...

    Started by Dinindu‎, Yesterday 09:37 PM
    chi square, evaluation criteria, ranking
    • Replies: 0
    • Views: 52
    Yesterday, 09:37 PM Go to last post
  7. 2D Conditional Probability

    Question X, Y are two independent random variables with cumulative distribution functions: F_X(x) = {0, x<0; x/3, 0<x<3; 1, x > 3} F_Y(y) =...

    Started by jhynes6‎, Yesterday 02:14 PM
    conditional probabilities
    • Replies: 2
    • Views: 105
    Yesterday, 05:00 PM Go to last post
  8. Method

    Hi, I am a newbie and I want analyse a set of data I have without using regression and correlation. Please can you outline other methods that would...

    Started by Bisola‎, 07-15-2014 04:33 AM
    • Replies: 5
    • Views: 202
    Yesterday, 01:38 PM Go to last post
  9. Confidence Interval help

    I am an engineering student working on some research and I am having some trouble constructing a confidence interval. I have various mechanical...

    Started by djb0724‎, Yesterday 01:34 PM
    • Replies: 0
    • Views: 79
    Yesterday, 01:34 PM Go to last post
  10. Joint density distribution and Variance

    Hi everyone! I was wondering if there is a way to calculate the joint distribution of two fully correlated variables, both with known...

    Started by Chris_egel‎, Yesterday 04:32 AM
    joint density, variance
    • Replies: 1
    • Views: 85
    Yesterday, 06:41 AM Go to last post
  11. Significance when there are no occurrences in one of the variables?

    Hi guys! We've been studying the incidence of pigs mounting each other in a group of pigs containing entire male pigs, gilts and castrates and in...

    Started by haldelberg‎, 07-22-2014 11:18 AM
    significance
    • Replies: 3
    • Views: 120
    Yesterday, 04:04 AM Go to last post
  12. (Please help) Imputing multiple Likert-type items

    I have a set of Likert-type variables that I'm trying to sum up to form a scale. My dataset has around 5000 subjects, and there are about <10%...

    Started by sunny3333‎, 07-22-2014 09:43 PM
    • Replies: 0
    • Views: 96
    07-22-2014, 09:43 PM Go to last post
  13. Molecular genetics study

    Hi Guys, I performed an experiment that is called mRNA poly A tail length assay (MPAT) on three different human tissues including liver, heart,...

    Started by Shamisa‎, 07-22-2014 02:30 PM
    • Replies: 2
    • Views: 155
    07-22-2014, 03:06 PM Go to last post
  14. MLE for X ~ Exp(λ)

    Let (X1, ... Xn) be a random sample from a random variable. Find the maximum likelihood estimator for λ. I know the answer to this but do you...

    Started by StatsBeginner‎, 07-21-2014 11:06 AM
    maximum likelihood
    • Replies: 14
    • Views: 254
    07-22-2014, 07:13 AM Go to last post
  15. Calculate Correlation Coefficient

    Hi guys, It's been a long time since I have stats in school, and I am trying to find the right answer on google to this, but you might be much...

    Started by EricaW‎, 07-22-2014 06:38 AM
    • Replies: 1
    • Views: 123
    07-22-2014, 06:43 AM Go to last post
  16. Hypothesis testing

    Could you please explain me how to do this exercise step by step? (http://oi57.tinypic.com/w1tv78.jpg) I know that it is a one-sided test and...

    Started by StatsBeginner‎, 07-22-2014 04:48 AM
    hypothesis test
    • Replies: 3
    • Views: 115
    07-22-2014, 06:41 AM Go to last post
  17. Simple OLS regression coefficient interpretation question

    I have my dependent variable Y and two independent variables, X_1 and X_2. Now assume at each point in time I convert each data point into...

    Started by TrueTears‎, 07-22-2014 02:23 AM
    • Replies: 1
    • Views: 76
    07-22-2014, 03:20 AM Go to last post
  18. Simple (silly) question

    Hi! I have a very simple (silly) question about Stats. Where does the 1.16 come from? Everything else is given in the exercise but I don't really...

    Started by StatsBeginner‎, 07-21-2014 10:44 AM
    • Replies: 8
    • Views: 124
    07-21-2014, 01:33 PM Go to last post
  19. Determining ideal sample size, testing normality in SPSS, bonferroni adjustment

    Hello all, I am new to the forum. I had a bit of training in statistics and research, particularly statistics in psychology, but I have some basic...

    Started by rsuri‎, 07-21-2014 09:13 AM
    assumptions, bonferroni, bonferroni correction, normality, sample size
    • Replies: 1
    • Views: 135
    07-21-2014, 10:04 AM Go to last post
  20. Volatility of abnormal returns.

    Hi all, When employing raw returns, one defines performance volatility as the standard deviation of these raw returns over some prior period (say...

    Started by Man‎, 07-21-2014 08:13 AM
    • Replies: 0
    • Views: 64
    07-21-2014, 08:13 AM Go to last post
  21. which statistical analysis with study design?

    Hi there I'm doing a study where i measure angles in objects at multiple levels with two different methods with 2 or 3 different readers. Test A is...

    Started by ogcdark‎, 07-18-2014 02:49 AM
    • Replies: 5
    • Views: 214
    07-21-2014, 07:46 AM Go to last post
  22. Chi Square Test, Pre Post Study, Dichotomous Variables, Different Group Sizes

    Hi Everybody, I am a medical student. I am doing a Final Year Project (FYP) and need a little help. I must admit to being a novice statistican and...

    Started by Macho Manu‎, 07-21-2014 06:08 AM
    chi square test, dichotomous, mcnemar test, pre and post
    • Replies: 1
    • Views: 107
    07-21-2014, 06:15 AM Go to last post
  23. Power Analysis for finding correlation of two continuous variables

    Hi, I'd like to do a power analysis. My data has two variables. My null hypothesis would, I'd think, be that the pearson correlation = 0, and the...

    Started by NSmaleBI‎, 07-16-2014 02:34 AM
    • Replies: 5
    • Views: 202
    07-21-2014, 01:54 AM Go to last post
  24. How do I Construct a 95% confidence interval (C.I.) with this formula?

    Hi, Im hoping someone can help do this for me. Construct a 95% confidence interval (Using the following formula: 95% C.I. Equals "mean +/-...

    Started by pcrcool‎, 07-19-2014 05:09 PM
    • Replies: 14
    • Views: 295
    07-20-2014, 04:42 AM Go to last post
  25. Can someone talk me through the very basics of power analysis please?

    Hello, I am looking at doing a study. I am told that I need to do a power analysis, even if I can't use the suggested number of participants,...

    Started by Jake-Finn‎, 07-16-2014 10:31 PM
    • Replies: 5
    • Views: 223
    07-20-2014, 02:16 AM Go to last post
  26. stats scenario problem - need help!

    Hello, New here so sorry if this thread is in the wrong category. I have a simple question with an answer that I cannot figure out. Here is a...

    Started by jay33‎, 07-18-2014 10:27 PM
    • Replies: 2
    • Views: 105
    07-19-2014, 03:41 PM Go to last post
  27. arima methods and filterind

    Hello, What is the effect of filtering data before applying arima methods on a time serie ? What would be the advantages and drawback of...

    Started by roukyno1‎, 07-18-2014 04:31 AM
    • Replies: 3
    • Views: 110
    07-18-2014, 03:17 PM Go to last post
  28. Question Statistics to manage doctors' appointments more reliably?

    Hello Yesterday, I went to an appointment with an ophthalmologist at a big health care center. I wasn't the first patient, but people go there...

    Started by Winfried‎, 07-17-2014 05:53 AM
    • Replies: 8
    • Views: 170
    07-18-2014, 09:03 AM Go to last post
  29. cumulative frequency polygon vs cumulative frequency curve

    According to my book Forming a cumulative frequency polygon indicates that you are assuming that the readings are evenly distributed through out...

    Started by stats_problems‎, 07-18-2014 01:29 AM
    • Replies: 0
    • Views: 94
    07-18-2014, 01:29 AM Go to last post
  30. t-stat and p-value

    Dear all, I have estimated several regressions using loop. I have managed to save the estimated alphas as new variables. Now I need to obtain the...

    Started by Aiko‎, 07-15-2014 04:17 PM
    • Replies: 4
    • Views: 236
    07-17-2014, 05:56 PM Go to last post
  31. Test the difference between the variance of two proportions

    Hello everyone, How can I test the difference between the variance of two proportions? Best, Ale

    Started by Alessandro_Italy‎, 07-17-2014 08:44 AM
    proportion, variance
    • Replies: 3
    • Views: 170
    07-17-2014, 02:54 PM Go to last post
  32. How much high/low is the variance if a variable?

    Hello everyone, How can you determine if a variable has a high variance or not? The variance, the standard deviation and the coefficient of...

    Started by Alessandro_Italy‎, 07-17-2014 08:24 AM
    coefficient of variation, variance
    • Replies: 1
    • Views: 107
    07-17-2014, 11:06 AM Go to last post
  33. Help analyzing result from GLM with a poisson distribution

    Can anyone help us analyse the results of this model? We're trying to test if gender ("koen") influences the occurrence of vocalizations see in pigs...

    Started by haldelberg‎, 07-17-2014 09:07 AM
    • Replies: 0
    • Views: 138
    07-17-2014, 09:07 AM Go to last post
  34. 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: 199
    07-17-2014, 09:06 AM Go to last post
  35. 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 07:57 AM
    2 Pages
    1 2
    • Replies: 15
    • Views: 523
    07-16-2014, 09:47 PM Go to last post
  36. 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: 132
    07-16-2014, 08:11 PM Go to last post
  37. 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: 201
    07-16-2014, 10:26 AM Go to last post
  38. 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: 110
    07-16-2014, 09:02 AM Go to last post
  39. 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: 129
    07-16-2014, 06:38 AM Go to last post
  40. GLM, poisson distribution, R

    Hi guys We've studied in total 60 groups of pigs (30 groups including male pigs, 30 groups of only females) for the occurrence of fighting...

    Started by haldelberg‎, 07-16-2014 05:48 AM
    • Replies: 0
    • Views: 99
    07-16-2014, 05:48 AM Go to last post
  41. 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: 104
    07-16-2014, 04:07 AM Go to last post
  42. 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: 134
    07-15-2014, 10:15 PM Go to last post
  43. 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: 164
    07-15-2014, 09:02 PM Go to last post
  44. 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: 176
    07-15-2014, 06:07 PM Go to last post
  45. 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: 100
    07-15-2014, 04:09 PM Go to last post
  46. 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: 114
    07-15-2014, 03:32 PM Go to last post
  47. 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: 138
    07-15-2014, 12:00 PM Go to last post
  48. 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: 184
    07-15-2014, 10:24 AM Go to last post
  49. 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: 136
    07-15-2014, 09:02 AM Go to last post
  50. 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: 209
    07-15-2014, 08:27 AM Go to last post
  51. 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: 226
    07-15-2014, 08:04 AM Go to last post
  52. 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: 102
    07-15-2014, 06:44 AM Go to last post
  53. 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: 201
    07-15-2014, 12:00 AM Go to last post
  54. 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: 187
    07-14-2014, 04:59 PM Go to last post
  55. 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: 151
    07-14-2014, 03:51 PM Go to last post
  56. 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: 114
    07-14-2014, 02:05 PM Go to last post
  57. 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: 124
    07-14-2014, 10:30 AM Go to last post
  58. 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: 108
    07-14-2014, 01:29 AM Go to last post
  59. 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: 152
    07-13-2014, 04:43 PM Go to last post
  60. 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: 263
    07-12-2014, 09:50 PM Go to last post

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