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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: 196,927
    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: 66,843
    09-30-2005, 09:44 AM Go to last post
  1. Is this correct?

    Hi, I have 2 questions I'm not sure of. 1.) According to a 1997 study, 29.3% of self- employed persons worked on their home based businesses 35...

    Started by toby‎, 03-19-2006 01:26 PM
    • Replies: 1
    • Views: 3,454
    08-01-2014, 09:15 AM Go to last post
  2. Rolling Dices

    here is how the problem goes: Charlie and Dave are betting over a sequence of rolls of a single die. Charlie will win the first time consecutive...

    Started by panz‎, 02-14-2006 03:49 PM
    • Replies: 1
    • Views: 2,744
    08-01-2014, 09:10 AM Go to last post
  3. A few questions

    Hi just wondering if anyone could just make sure I'm doing this right. Can you also help on the last question especially. Thanks 1) Z~N(0,1) and...

    Started by mariomaths‎, 03-16-2006 04:17 PM
    • Replies: 1
    • Views: 2,452
    08-01-2014, 09:01 AM Go to last post
  4. Comparing two test conditions two different ways -- what is the logical difference?

    Consider this: Test 1: Heat treat and check hardness of 8 samples at two different heat treat oven settings (for simplicity, let's call them HOT...

    Started by Tenser‎, 07-30-2014 08:11 AM
    • Replies: 5
    • Views: 2,127
    08-01-2014, 07:51 AM Go to last post
  5. Smile lmPerm - has it been removed?

    I can't seem to find this package - "lmPerm" (linear model permutation test). On the page http://cran.r-project.org/web/packages/lmPerm/index.html...

    Started by sgmanohar‎, 08-01-2014 06:41 AM
    cran, lmperm
    • Replies: 0
    • Views: 3,134
    08-01-2014, 06:41 AM Go to last post
  6. Problematic variables in regression model

    I'm using data from from a publicly available Europe-wide survey of employees which was conducted over a series of waves from 1991-2010. The survey...

    Started by cc456‎, 08-01-2014 05:00 AM
    data, regression analysis, regression models, variable
    • Replies: 0
    • Views: 1,397
    08-01-2014, 05:00 AM Go to last post
  7. Histogram

    Hello, I have a question: What obvious information do histograms give. For example, I know that scatterplots show the strength and the direction...

    Started by AlexKom‎, 03-27-2006 11:23 PM
    • Replies: 6
    • Views: 4,386
    07-31-2014, 11:54 AM Go to last post
  8. Beginner Confidence Level Question

    Hope someone can assist. Tyring to calaculate a confidence Levels and intervlas if possible for an upcoming Audit. I want to make sure I collect...

    Started by NewToStat‎, 07-31-2014 08:17 AM
    • Replies: 1
    • Views: 1,086
    07-31-2014, 11:01 AM Go to last post
  9. Help with Log Transformation

    Looking at my results, they do not fit the normal distribution curve. Therefore I was advised to do a 'log transformation' of the data. Is there...

    Started by naturalgut‎, 04-07-2008 07:36 AM
    • Replies: 14
    • Views: 23,886
    07-31-2014, 07:21 AM Go to last post
  10. Within-subjects test for equality of variances with dichotomous variables

    Does anyone know any test for equality of variances when using dichotomous variables and related samples? Thank you all.

    Started by Holmes‎, 07-31-2014 04:14 AM
    • Replies: 0
    • Views: 852
    07-31-2014, 04:14 AM Go to last post
  11. Reducing number of categories for independence tests

    Consider categorical variable wich falls naturally into K categories. Given 2 data sets (or samples), one usually considers 2xK contingency table for...

    Started by Oreochromis‎, 07-29-2014 07:47 PM
    • Replies: 3
    • Views: 1,115
    07-30-2014, 04:58 PM Go to last post
  12. Using a kurtosis statistic as a dependent variable

    Hi everyone, I am working on a research project in public policy and I am testing kurtosis for on the year-to-year budget changes (as %) in...

    Started by jdreg‎, 07-30-2014 12:05 PM
    dependent variables, kurtosis, regression analysis
    • Replies: 1
    • Views: 1,084
    07-30-2014, 01:37 PM Go to last post
  13. Basic Sample Sizing Question

    Hi all, I haven't done any stats for a long time, I am looking to incorporate some stats into my Ops Risk role to get a little edge. I think I am...

    Started by Jono_Harris‎, 07-11-2014 07:29 AM
    confidence, margin of error, sample, size, testing
    • Replies: 3
    • Views: 1,433
    07-30-2014, 08:04 AM Go to last post
  14. Find weak periodical pattern from time series data

    I have a piece of time series data as shown in the following link. http://postimg.org/image/9sf858wyr/ There exist a weak periodical pattern (it...

    Started by liuyang503‎, 07-29-2014 03:20 PM
    • Replies: 0
    • Views: 734
    07-29-2014, 03:20 PM Go to last post
  15. Repeated Measures ANOVA and baseline control

    Ive been asked to work on a cross-over design study for an MSc project. The study is looking at the effects of sleep deprivation on word recall. ...

    Started by loops22‎, 07-29-2014 05:31 AM
    • Replies: 1
    • Views: 926
    07-29-2014, 05:51 AM Go to last post
  16. How to find weber fractions from a confusion matrix

    I have a confusion matrix for a 4 class classification problem which looks this: My hypothesis is that group 3 is easiest to classify. Somebody...

    Started by anon91‎, 07-28-2014 04:22 PM
    • Replies: 0
    • Views: 1,149
    07-28-2014, 04:22 PM Go to last post
  17. I really need help interpreting this study?

    Hello, I'm actually trying to write a sociology paper on race, but I have no idea how to interpret this study:...

    Started by JC177‎, 07-25-2014 03:01 PM
    • Replies: 13
    • Views: 1,722
    07-27-2014, 01:02 PM Go to last post
  18. Comparing two large categorical data sets with low counts

    I'm studying a biological feature which can be classified into 2^20 categories. These categories can be thought as a dictionary of a fixed-length...

    Started by Oreochromis‎, 07-26-2014 11:53 AM
    categorical data analysis, chi square
    • Replies: 4
    • Views: 1,899
    07-27-2014, 12:38 PM Go to last post
  19. Multiple Imputations in a Dataset

    Dear all, I'm a student working on a dataset based on a cross-sectional survey. The dataset includes around 200participants. The main analysis...

    Started by PsychStats_Leb‎, 07-27-2014 07:18 AM
    missing data, multiple imputations, survey
    • Replies: 0
    • Views: 927
    07-27-2014, 07:18 AM Go to last post
  20. Predictive model needed - bespoke or off the shelf software ?

    Good day all, I am a complete novice with stats and zero experience but I do have a stats problem regarding data I have in excel and seek some...

    Started by MrMarkB‎, 07-26-2014 12:34 PM
    • Replies: 1
    • Views: 1,713
    07-27-2014, 12:06 AM Go to last post
  21. Exclamation Need help choosing statistical test for catagorical data

    Hi, I am not sure which statistical test I should do. My values are in percentages and the categorical data is for different climate scenarios. I...

    Started by psiz‎, 07-25-2014 09:10 AM
    • Replies: 0
    • Views: 1,057
    07-25-2014, 09:10 AM Go to last post
  22. Comparing the variance of two samples with differing measurement error

    This is a statistics as applied to astronomy problem - I apologise in advance for my woeful stats knowledge! OK - the problem: For several...

    Started by Craiga‎, 07-24-2014 11:50 PM
    sample comparison, variance
    • Replies: 0
    • Views: 706
    07-24-2014, 11:50 PM Go to last post
  23. Factor analysis - Mean = 0 and Std. = 1 ??

    Hi guys I hope you can help me! I am dooing a factor analysis in SPSS. I am using principal components, listwise, varimax and extract on...

    Started by Kenderdu‎, 07-24-2014 11:01 AM
    • Replies: 2
    • Views: 1,397
    07-24-2014, 05:00 PM Go to last post
  24. 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, 07-24-2014 09:21 AM
    maximum likelihood
    • Replies: 3
    • Views: 1,465
    07-24-2014, 04:59 PM Go to last post
  25. Determine standard deviation from percentages

    I have a normal distribution of data with a mean of 0. I know that 80% of the data falls within 3 units of the mean. So 80% of the data is from -3...

    Started by bobbytables‎, 07-24-2014 11:48 AM
    means, standard deviation
    • Replies: 4
    • Views: 1,542
    07-24-2014, 01:44 PM Go to last post
  26. 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, 07-24-2014 04:04 AM
    • Replies: 6
    • Views: 1,485
    07-24-2014, 09:22 AM Go to last post
  27. 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, 07-23-2014 09:38 AM
    • Replies: 1
    • Views: 1,778
    07-24-2014, 03:27 AM Go to last post
  28. [ 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: 1,658
    07-24-2014, 02:13 AM Go to last post
  29. 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, 07-24-2014 01:42 AM
    gender, moderated multiple regres, regression help, stats help
    • Replies: 0
    • Views: 1,097
    07-24-2014, 01:42 AM Go to last post
  30. 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, 07-23-2014 09:37 PM
    chi square, evaluation criteria, ranking
    • Replies: 0
    • Views: 1,234
    07-23-2014, 09:37 PM Go to last post
  31. 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, 07-23-2014 02:14 PM
    conditional probabilities
    • Replies: 2
    • Views: 1,612
    07-23-2014, 05:00 PM Go to last post
  32. 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: 1,386
    07-23-2014, 01:38 PM Go to last post
  33. 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, 07-23-2014 01:34 PM
    • Replies: 0
    • Views: 947
    07-23-2014, 01:34 PM Go to last post
  34. 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, 07-23-2014 04:32 AM
    joint density, variance
    • Replies: 1
    • Views: 1,145
    07-23-2014, 06:41 AM Go to last post
  35. 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: 1,332
    07-23-2014, 04:04 AM Go to last post
  36. (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: 1,171
    07-22-2014, 09:43 PM Go to last post
  37. 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: 1,464
    07-22-2014, 03:06 PM Go to last post
  38. 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: 13,151
    07-22-2014, 07:13 AM Go to last post
  39. 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: 1,343
    07-22-2014, 06:43 AM Go to last post
  40. 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: 1,343
    07-22-2014, 06:41 AM Go to last post
  41. 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: 940
    07-22-2014, 03:20 AM Go to last post
  42. 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: 1,512
    07-21-2014, 01:33 PM Go to last post
  43. 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: 1,238
    07-21-2014, 10:04 AM Go to last post
  44. 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: 907
    07-21-2014, 08:13 AM Go to last post
  45. 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: 3,282
    07-21-2014, 06:15 AM Go to last post
  46. 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: 3,891
    07-21-2014, 01:54 AM Go to last post
  47. 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: 2,964
    07-20-2014, 04:42 AM Go to last post
  48. 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: 1,754
    07-20-2014, 02:16 AM Go to last post
  49. 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: 716
    07-19-2014, 03:41 PM Go to last post
  50. 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: 1,374
    07-18-2014, 03:17 PM Go to last post
  51. 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: 1,873
    07-18-2014, 09:03 AM Go to last post
  52. 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: 1,532
    07-18-2014, 01:29 AM Go to last post
  53. 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: 2,065
    07-17-2014, 05:56 PM Go to last post
  54. 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: 1,610
    07-17-2014, 02:54 PM Go to last post
  55. 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: 1,073
    07-17-2014, 11:06 AM Go to last post
  56. 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: 842
    07-17-2014, 09:07 AM Go to last post
  57. 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: 1,427
    07-17-2014, 09:06 AM Go to last post
  58. 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: 4,168
    07-16-2014, 09:47 PM Go to last post
  59. 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: 7,254
    07-16-2014, 08:11 PM Go to last post
  60. 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: 9,857
    07-16-2014, 10:26 AM Go to last post

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