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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: 197,315
    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: 67,061
    09-30-2005, 09:44 AM Go to last post
  1. Question Relationship between Two Varibles: Finding the Covariance, Correlation, and IQR

    Eight randomly selected students who completed a course in Statistics were asked (1) the number of months between when they finished Algebra and...

    Started by reilyn‎, 01-26-2013 04:51 PM
    • Replies: 10
    • Views: 2,176
    01-26-2013, 07:38 PM Go to last post
  2. Correction of p-value for multiple testing - What's my value of 'n' in Bonferroni?

    Hey everyone! I have a statistical question you might be able to help me with. I hope all the terms I use are correct and it's understandable...

    Started by reptile1893‎, 01-26-2013 01:20 PM
    • Replies: 0
    • Views: 1,524
    01-26-2013, 01:20 PM Go to last post
  3. Correct test (z-test?) for differences in replicated, log-normally distributed data

    Hi there, I can't seem to determine the correct test to use, after searching through forum posts with similar but not quite the same type of data. ...

    Started by Johnstat‎, 01-26-2013 12:22 PM
    • Replies: 0
    • Views: 1,291
    01-26-2013, 12:22 PM Go to last post
  4. Question Mediation when the independent variable is a moderator (interaction) variable

    Hello, I have a simple question for which I could not find an answer on internet. I have a simple X-Y-Z mediation model. However X variable is an...

    Started by Buraczku‎, 01-26-2013 09:41 AM
    • Replies: 0
    • Views: 1,178
    01-26-2013, 09:41 AM Go to last post
  5. identify under-performing meter / counter

    Hello All; I would be gratfull if you could help me solving a problem that I need to integrate into an automation system. The problem is: 1- I...

    Started by alex4evr‎, 01-24-2013 12:05 PM
    • Replies: 1
    • Views: 1,085
    01-26-2013, 09:32 AM Go to last post
  6. Question Anderson-Darling Normality Test

    Hi all, I am not big with statistics or excel, so forgive me if I ask basic and simple questions. I have a macro set up in excel '07 to...

    Started by japalish‎, 07-20-2009 03:19 AM
    • Replies: 3
    • Views: 6,203
    01-26-2013, 07:41 AM Go to last post
  7. help with t.test (equal or unequal variances)

    Hi all, I am trying to better understand how the t.test works. I obtained extremely different results if I used the R's t.test with or without...

    Started by Federico‎, 09-13-2012 07:54 AM
    • Replies: 5
    • Views: 2,279
    01-26-2013, 07:09 AM Go to last post
  8. How to compute a measure of the similarity of products

    Hi, I'm trying to the compare the overall similarity of alternative products to a baseline product. Each product has 5 measurable attributes...

    Started by bradyj2‎, 01-25-2013 10:28 AM
    • Replies: 5
    • Views: 1,467
    01-26-2013, 06:39 AM Go to last post
  9. How do I solve this?

    Hi all. First post here. I work in accounting and would like to apply some statistics to help solve an issue. We use a standard costing...

    Started by ItPaysTheBills‎, 01-25-2013 11:01 PM
    • Replies: 0
    • Views: 1,129
    01-25-2013, 11:01 PM Go to last post
  10. Comparing subpopulations in a single sample

    This involves a single sample with individuals in that sample working in areas (no worker can be in two different areas). What I want to tell is if...

    Started by noetsi‎, 01-25-2013 08:41 PM
    • Replies: 6
    • Views: 1,957
    01-25-2013, 10:03 PM Go to last post
  11. Mcnemar's test for dichotomous IV vs. dichotomous DV: how pertinent is it?

    I intend to study the effect of a given psychological intervention (dichotomous independent variable) on the compliance of a medical treatment...

    Started by joaomachadovaz‎, 01-25-2013 03:03 PM
    dichotomous dv, dichotomous iv, mcnemar, mcnemar's, psychology
    • Replies: 2
    • Views: 2,213
    01-25-2013, 05:06 PM Go to last post
  12. levene's test

    Hallo all, I normally do levene's test with a statistical program, however I would like to know how I can do this manually. The problem is that I...

    Started by philll‎, 01-25-2013 03:55 PM
    • Replies: 0
    • Views: 1,924
    01-25-2013, 03:55 PM Go to last post
  13. short percentile question

    I need to find the 10th percentile and 90th percentile from 60 numbers. I know I have to set up numbers so its low to high. Afterwards, if it is...

    Started by briankimmy‎, 01-25-2013 09:32 AM
    • Replies: 3
    • Views: 2,195
    01-25-2013, 10:06 AM Go to last post
  14. Short question, not sure how to title

    3. Suppose that final grades in a statistics course are normally distributed with a mean of 72 and a standard deviation of 5. a. What range of...

    Started by briankimmy‎, 01-25-2013 06:47 AM
    • Replies: 3
    • Views: 1,153
    01-25-2013, 09:29 AM Go to last post
  15. Need help with simple statistics problem please!

    It involves Sigma signs, need help on question 2, part a , the last 2 formulas. It was very confusing for me. For the first 3 i got 49, 423, 2401...

    Started by briankimmy‎, 01-25-2013 06:19 AM
    • Replies: 3
    • Views: 2,117
    01-25-2013, 06:42 AM Go to last post
  16. Sample Sizing, Statistical Significance and Variance

    Hey Everyone, I'm not a stat student. I run websites, and part of my job is testing different versions of websites against one another to see...

    Started by DerekP‎, 01-24-2013 09:16 PM
    • Replies: 1
    • Views: 1,514
    01-25-2013, 05:38 AM Go to last post
  17. Realy need hellp with type1 and type2 error problem

    The quality control manager in a chip manufacturing plant has to select one of two available quality control methods. The estimated error rates for...

    Started by freddi‎, 11-01-2010 08:40 PM
    • Replies: 2
    • Views: 3,239
    01-25-2013, 04:04 AM Go to last post
  18. LOF: Identifying Density-Based Local Outliers by Markus M. Breunig - quick question

    LOF: Identifying Density-Based Local Outliers by Markus M. Breunig I am implementing this method. I have it completed but i am unsure of the...

    Started by frage_no15‎, 01-25-2013 03:40 AM
    local outlier factor
    • Replies: 0
    • Views: 2,605
    01-25-2013, 03:40 AM Go to last post
  19. Derive formula for determining sample size?

    Hi everyone, I just have a problem from a exercise question and hopefully someone can help. Q: Derive the formula for determining the sample size...

    Started by frankcrest‎, 01-24-2013 11:57 PM
    • Replies: 1
    • Views: 3,453
    01-25-2013, 01:34 AM Go to last post
  20. t-Test help: Two-Sample - Difference between assuming equal vs. unequal variances?

    Hello all, I'm needing some help here. I'm trying to figure out whether or not my statistics problem would use the "t-Test: Two-Sample...

    Started by bryan‎, 01-24-2013 02:31 PM
    • Replies: 7
    • Views: 76,651
    01-25-2013, 01:15 AM Go to last post
  21. Smile Chi Square, Likert Scale, and Within Group - reasoning

    I am hoping some really smart folks can answer this question for me and provide some sage and learned advice to help me finish the last piece of my...

    Started by DawnDBoyer‎, 01-24-2013 01:06 PM
    chi square, conclusion, likert scale, statistical analysis, within group
    • Replies: 0
    • Views: 4,247
    01-24-2013, 01:06 PM Go to last post
  22. Statistics- Confidence Interval Estimator

    I have a question which I am stuck on. I have tried to solve it but am quite wary if I am heading in the right direction. The question is as follows:...

    Started by Kev007‎, 01-23-2013 08:30 AM
    • Replies: 7
    • Views: 2,409
    01-24-2013, 11:39 AM Go to last post
  23. Am I using Chi-square appropriately for eating/not-eating in three treatment groups?

    I wish to analyse animal behaviour. classifying behaviour into eating and not-eating, for which I have observed each animal every minute for two...

    Started by David Carey‎, 01-23-2013 07:09 PM
    • Replies: 2
    • Views: 1,290
    01-24-2013, 11:19 AM Go to last post
  24. Regularized incomplete beta + continued fraction

    As per my understanding, regularized beta function is the CDF of beta distribution. In ms_xls (msoffice 2010) there is a standard method BETA.DIST(x,...

    Started by DeepakKumar‎, 01-24-2013 08:25 AM
    • Replies: 0
    • Views: 1,036
    01-24-2013, 08:25 AM Go to last post
  25. Calculated Expected Value using property and Correlation!

    Hi, I have done the calculations, but want to see if I have answered the question correctly. "Let U and V be independent random variables with...

    Started by S-C-3-1-3‎, 01-23-2013 06:45 PM
    • Replies: 3
    • Views: 1,763
    01-24-2013, 04:55 AM Go to last post
  26. Why the value of skewness is different from excel? what's the formula using in Stata?

    hi: i used the "summarize" command and got the following results: Percentiles Smallest 1% -.2483944 -.2555543 5% -.1318041 -.2555543...

    Started by toukai‎, 01-23-2013 07:49 PM
    • Replies: 0
    • Views: 2,058
    01-23-2013, 07:49 PM Go to last post
  27. Variance of a sum of binomiali random variables

    Let Y be the sum of n random varables iid ~bin(1,p). How does one calculate Var(Y/n)? I started by finding E(Y/n) = p. How to calculate E(Y^2)?

    Started by chancellor‎, 01-23-2013 05:19 PM
    • Replies: 1
    • Views: 1,836
    01-23-2013, 05:56 PM Go to last post
  28. Computing the mean incrementally using subsets

    Hi, I am tackling a problem: There is a set M containing real numbers. The goal is to compute the mean of values in M. The algorithm is as...

    Started by sahra_kavir‎, 01-23-2013 05:08 PM
    • Replies: 0
    • Views: 1,057
    01-23-2013, 05:08 PM Go to last post
  29. Yellow diamonds in the sky

    hi could any of you pls help me with the following question. pls try and explain each step bcos m doin maths after 3 years. thanx. The random...

    Started by jas15‎, 01-23-2013 01:02 PM
    • Replies: 1
    • Views: 1,068
    01-23-2013, 02:11 PM Go to last post
  30. Tail Value at Risk of a bounded single parameter Pareto distribution, L<x<H.

    Hello I am having some difficulties calculating the Tail Value at Risk of the bounded single parameter Pareto distribution, L<x<H. Do you have...

    Started by annago‎, 01-23-2013 01:39 PM
    • Replies: 0
    • Views: 2,112
    01-23-2013, 01:39 PM Go to last post
  31. How to calculate significant differences

    Hi Everyone.. I am stuck on one of my assignment questions. I have two samples, let's say List of employees in one Department A each with an...

    Started by Richard.Chambula‎, 01-22-2013 10:34 PM
    significant differences
    • Replies: 7
    • Views: 2,771
    01-23-2013, 12:55 PM Go to last post
  32. How do you do an F-test for R-square

    Hi, How do you do an F-test to test significance of R-square in EXCEL? I have done a linear regression and get R-square = 0.412, how can I test if...

    Started by LizR‎, 01-17-2013 08:07 AM
    • Replies: 10
    • Views: 32,765
    01-23-2013, 08:58 AM Go to last post
  33. [SOLVED] Need some Help on my TI84

    Sorry if this is not the place to post it. But I am trying to get to the list where I can see X Min X Max S SCL Y Min Y Max y Scl Graph.

    Started by FC Stats‎, 01-23-2013 12:34 AM
    • Replies: 3
    • Views: 2,208
    01-23-2013, 04:19 AM Go to last post
  34. Calculating Conditional Expectation

    edit: nevermind

    Started by sjones45‎, 01-23-2013 12:26 AM
    • Replies: 1
    • Views: 840
    01-23-2013, 12:40 AM Go to last post
  35. Alternatives to two-way tables

    Are there any alternatives to two-way tables that show a higher level of understanding? If you know some, could you please detail and explain how...

    Started by Chelsea20677‎, 01-22-2013 03:09 PM
    • Replies: 1
    • Views: 1,050
    01-22-2013, 03:21 PM Go to last post
  36. The most suitable ARMA Tool for forecasting?

    what is the most appropriate trial software tool for building an ARMA forecasting model? I need to build forecasting model using historical data...

    Started by manishvrm‎, 01-21-2013 12:40 PM
    • Replies: 6
    • Views: 1,497
    01-22-2013, 02:36 PM Go to last post
  37. ANOVA - one-way vs repeated measures? or both?

    What is the best way to analyze this data please? I have 2 groups (treatment group, control group) and 2 time points for each group (day 0, day 1,...

    Started by lpanossian‎, 01-21-2013 06:14 PM
    anova, one-way anova, post-test, repeated measures, stata
    • Replies: 2
    • Views: 1,705
    01-22-2013, 12:35 PM Go to last post
  38. Unhappy Time Series Noob

    Hey guys, first time posting here, hopefully someone can help me. Let {Z_{t}} be an IID sequence with mean 0 and variance \sigma^2. (I think this...

    Started by calculuskid1‎, 01-21-2013 11:32 PM
    • Replies: 2
    • Views: 966
    01-22-2013, 10:00 AM Go to last post
  39. how can I evaluate chi-square CDF?

    Hello, I want to know how can I evaluate CDF of chi square by 1 degree of freedom in special point, Anybody can help?

    Started by z_stat‎, 01-22-2013 01:53 AM
    • Replies: 3
    • Views: 2,393
    01-22-2013, 09:30 AM Go to last post
  40. PERMANOVA - choice of distance measure

    Hi, I want to run a (PRIMER based) PERMANOVA analysis on my univariate data (output var.= weight of organisms, and 3 factors = 2 fixed, 1 random)...

    Started by Trond‎, 01-22-2013 02:54 AM
    bray-curtis, distance measure, euclidean distance, permanova
    • Replies: 4
    • Views: 6,022
    01-22-2013, 04:04 AM Go to last post
  41. Expected value of a probability density function

    I was given a table that looks like this: y | f(y) ________ -1 | 0.25 0 | 0.5 1 | 0.25 And I am asked to calculate the...

    Started by elatedeconomist‎, 01-21-2013 05:38 PM
    • Replies: 3
    • Views: 1,364
    01-21-2013, 05:49 PM Go to last post
  42. Please help?

    Hi, I wonder if you could help me out: I try to do statistics to find out the most hit street distance in roulette.(from the real wheel) A street is...

    Started by ignatus‎, 01-21-2013 07:22 AM
    • Replies: 2
    • Views: 936
    01-21-2013, 01:33 PM Go to last post
  43. Poll Poll: which sampling methods-reply ASAP

    For some statistics course work, I am investigating two hypothesis', and I am not sure which sampling method I should use. They hypothesis' are: the...

    Started by Chelsea20677‎, 01-20-2013 03:44 PM
    data pre-processing, help needed, important, sampling, sampling plan
    • Replies: 4
    • Views: 1,524
    01-21-2013, 12:03 PM Go to last post
  44. Looking for health care fraud example data set

    Hi All, I am looking for a simple data set that includes fraud in healthcare. I need to this to work on fraud detection. I looked around...

    Started by viktus‎, 01-20-2013 06:10 PM
    • Replies: 3
    • Views: 2,254
    01-21-2013, 11:49 AM Go to last post
  45. What is a link function (in English)

    In generalized linear models there are link functions. I would like if someone could explain the concept to me. Thanks!

    Started by killbot2000‎, 01-21-2013 11:22 AM
    glm, link function
    • Replies: 1
    • Views: 3,272
    01-21-2013, 11:41 AM Go to last post
  46. [SOLVED] Learning about network graphs (check my answers please)

    I've assigned myself HW in trying to learn about network graphs. I got my HW from here: (LINK) Here's the 4 graphs I attempted to draw. ...

    Started by trinker‎, 06-15-2012 10:21 PM
    • Replies: 3
    • Views: 1,714
    01-21-2013, 10:24 AM Go to last post
  47. Time series

    I have a dataset of demands in excel which I want to filter so that I only retain a purely stochastic demand (dataset in excel file). So I want to...

    Started by CrazyTalk‎, 01-21-2013 09:48 AM
    • Replies: 0
    • Views: 1,431
    01-21-2013, 09:48 AM Go to last post
  48. Basic statistics help?

    Hey guys, I am working on my project for the STEM fair and was wondering if you could help me. I haven't taken AP Stat since two years ago and I am...

    Started by hssnd_noh‎, 01-20-2013 03:33 PM
    • Replies: 2
    • Views: 1,571
    01-20-2013, 04:52 PM Go to last post
  49. Question Time Series: Which model to fit?

    I have data on Infant Mortality Rates of last 40 years. How to understand whether I should fit a MA , AR or ARMA model?

    Started by Sambit‎, 01-19-2013 11:42 AM
    • Replies: 6
    • Views: 2,605
    01-20-2013, 04:32 PM Go to last post
  50. Which test to use for comparing rankings?

    Hello, I have some questions about how to analyze ranked data. The data looks like this: groups of people with HIV and other groups of people...

    Started by jacky‎, 01-18-2013 02:29 PM
    • Replies: 4
    • Views: 1,412
    01-20-2013, 09:58 AM Go to last post
  51. marginal effects probit versus logit

    Is there a rule of thumb for comparing the marginal effects estimated by logit versus probit based on the coefficients in mentioned models?

    Started by JesperHP‎, 01-20-2013 09:34 AM
    • Replies: 0
    • Views: 1,204
    01-20-2013, 09:34 AM Go to last post
  52. Which formula to use

    Hi, I have 2 columns of numbers (x,y), I want to find which value in column X will give the maximum value in column Y. What formula does it?...

    Started by russo‎, 01-20-2013 06:59 AM
    statistic
    • Replies: 0
    • Views: 917
    01-20-2013, 06:59 AM Go to last post
  53. How to calculate the distance...

    Hi, I'm new to this forum. I'm a roulette player and I use STATA to calculate the average distance of two streets... (distance cannot be greater...

    Started by ignatus‎, 01-19-2013 07:03 PM
    • Replies: 4
    • Views: 2,245
    01-19-2013, 11:02 PM Go to last post
  54. Maximum Likelihood Estimation Exercise (short)

    Hi I have found the following exercise while trying to understand the Maximum Likelihood Estimation in Practice: "In a random sample of 1000...

    Started by Miau Piau‎, 01-16-2013 05:59 PM
    maximum likelihood
    • Replies: 5
    • Views: 2,046
    01-19-2013, 08:50 PM Go to last post
  55. Exclamation Absolutely lost!

    Hi everyone, I am trying to figure out how to solve the following problem and can't, for the life of me, understand which test I should use. My...

    Started by canadiandude‎, 01-19-2013 10:28 AM
    • Replies: 13
    • Views: 2,003
    01-19-2013, 07:32 PM Go to last post
  56. Question Help a dizzy blonde anyone??

    Hey guys, I need someone to point me in the right direction on which stats tests to do for this experiment if someone would please take the time, I'd...

    Started by Babygoose‎, 01-19-2013 04:42 PM
    • Replies: 1
    • Views: 1,135
    01-19-2013, 04:45 PM Go to last post
  57. Undergrad struggling in dissertation statistics...

    hi people, I'm working through my results and need to do some statistics to prove they are statistically significant... The first is loss on...

    Started by mb-king‎, 01-18-2013 01:26 PM
    • Replies: 3
    • Views: 1,701
    01-19-2013, 02:27 PM Go to last post
  58. how to test this memory research question?

    okay, say you have all races in a study. you want to test how well they recognize people of their own race. you hypothesize that whites will...

    Started by pinkk‎, 01-18-2013 06:47 AM
    • Replies: 3
    • Views: 1,447
    01-18-2013, 09:31 PM Go to last post
  59. Interpreting Cointegration in Gretl

    Hi all, I recently stumbled across Gretl and love its simplicity. I was wondering if anyone has any links/resources or tips to recommend in...

    Started by statarb‎, 01-18-2013 03:55 PM
    • Replies: 0
    • Views: 3,967
    01-18-2013, 03:55 PM Go to last post
  60. One-way repeated measures ANOVA - correct?

    Hi. I have come to the end of a research pilot study and need to anaylse my data. I wanted to check I am doing it correct. Study: I am taking a...

    Started by Sarah_G‎, 01-18-2013 04:32 AM
    • Replies: 1
    • Views: 1,443
    01-18-2013, 02:01 PM Go to last post

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