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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: 197,273
    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: 67,035
    09-30-2005, 09:44 AM Go to last post
  1. Thumbs up trying to determine which test to use for constancy of mean price of milk

    "You have been asked to determine if the mean price of milk in your city has remained constant. Suppose that a random sample of n=2 was selected for...

    Started by Jones‎, 02-01-2015 03:44 PM
    • Replies: 0
    • Views: 1,654
    02-01-2015, 03:44 PM Go to last post
  2. Confidence Interval for binary data

    If I want to calculate the 99% confidence interval for binary data. For example lets say I asked 500 people if they had ever done a bungee jump? ...

    Started by calypso‎, 02-01-2015 02:48 PM
    • Replies: 0
    • Views: 2,297
    02-01-2015, 02:48 PM Go to last post
  3. Cool Sample size calculation for kappa statistic, at 90% power

    Hello everyone! I have looked through many previous posts, but cannot find an answer to my question. I am comparing the results from two pieces of...

    Started by CatherineS‎, 02-01-2015 09:37 AM
    • Replies: 1
    • Views: 4,632
    02-01-2015, 10:24 AM Go to last post
  4. Adding the mean to a set of scores doesn't change it. Why?

    Hello everybody! I am very happy to have found this forum. I am working away with my undergraduate research methods courses. I am not very good at...

    Started by Suzy46‎, 01-30-2015 01:40 PM
    • Replies: 8
    • Views: 2,653
    01-31-2015, 04:58 AM Go to last post
  5. Performing a Paired T test

    239 subjects had their cholesterol measured, and then were put on high-fiber diets. After a month on the high-fiber diet, the cholesterol was...

    Started by raidernation‎, 01-30-2015 11:39 PM
    • Replies: 0
    • Views: 1,261
    01-30-2015, 11:39 PM Go to last post
  6. Is there a way to convert relative risk to cohen's d or odd's ratios?

    So I only have RR but no counts. For a meta-analysis these need to be put on a common metric with other results which all use cohen's d. Hence the...

    Started by Lazar‎, 01-29-2015 05:58 PM
    • Replies: 10
    • Views: 3,686
    01-30-2015, 05:42 PM Go to last post
  7. Equivalence testing - on IQ scores for independent groups

    Equivalence testing IQ Hello, I want to conduct a test of equivalence on IQ between two groups. I came across a post where someone (I think it was...

    Started by Siobh‎, 01-30-2015 05:44 AM
    • Replies: 6
    • Views: 1,897
    01-30-2015, 03:01 PM Go to last post
  8. What is pillai's trace value?

    Dear fellows, I stumbled on this using the software Gpower, Doing some basic research I cannot really understand what exactly is!:confused: ...

    Started by Ornitho‎, 01-30-2015 07:11 AM
    pillai's trace
    • Replies: 0
    • Views: 3,432
    01-30-2015, 07:11 AM Go to last post
  9. independent or dependent samples

    I am trying to learn which test to use to determine if the difference between two samples is significant. For instance, "The following data set...

    Started by Jones‎, 01-30-2015 12:07 AM
    • Replies: 1
    • Views: 1,827
    01-30-2015, 03:37 AM Go to last post
  10. How to detect a seasonnal variation on time series data

    Hello everyone, I would like to compare the distribution of night bat activity recorded each hour from 5 pm to 3am (a number of call per hour)...

    Started by Placo‎, 01-29-2015 11:45 PM
    • Replies: 0
    • Views: 899
    01-29-2015, 11:45 PM Go to last post
  11. Comparing data from multiple samples - which model?

    Hello My job is to measure electrical characteristics of transistors e.g. onset voltage or threshold voltage. Every wafer I test has roughly 4000...

    Started by pete900‎, 10-14-2014 08:56 AM
    • Replies: 14
    • Views: 3,147
    01-29-2015, 11:36 AM Go to last post
  12. Scoring model/formula to rank based on accuracy of data sources

    Let us say i have 5 different data sources. My aim is arrive a score to arrive the accuracy of this data sources. It is like below 1. Refer the...

    Started by karthikr44‎, 01-28-2015 08:11 PM
    accuracy, ranking, scoring, statistics
    • Replies: 0
    • Views: 1,555
    01-28-2015, 08:11 PM Go to last post
  13. Confidence Intervals

    Let p1 and p2 be the respective proportions of women with nutritional anemia in each of two developing countries. If a random sample of 250 women...

    Started by ALRS‎, 01-28-2015 08:11 PM
    • Replies: 0
    • Views: 1,572
    01-28-2015, 08:11 PM Go to last post
  14. Basic question...how to calculate minimum sample size with complete population data

    Hello, out-of-practice stats guy here. A business question I have is what is the minimum sample size I need to accurately measure revenue per...

    Started by Wolfram‎, 01-23-2015 12:05 PM
    • Replies: 1
    • Views: 1,624
    01-28-2015, 03:09 PM Go to last post
  15. Exclamation Which Statistical Test to use for my project - Comparing two ranked lists, 2 groups

    I have a project comparing two medical treatments - 1) Treat a Presentation and 2) Treat after Growth. I am comparing the groups based on the...

    Started by CTME23‎, 01-28-2015 03:02 PM
    average, list, lists, weighted
    • Replies: 0
    • Views: 1,386
    01-28-2015, 03:02 PM Go to last post
  16. Formula question (frequency based dominance index FDI)

    solved: its a summing over both the i and the k. Reading the manuscript again I realized which cells must be omitted when doing the double...

    Started by etron770‎, 01-28-2015 01:37 PM
    • Replies: 0
    • Views: 1,170
    01-28-2015, 01:37 PM Go to last post
  17. Spatial statistics: proving a relationship between the proximity of two features

    Dear all, I have several maps of an estuary, with two variables noted for each year the map was made: position of salt marsh edge and position of the...

    Started by osp24f‎, 01-27-2015 01:34 PM
    proximity, spatial statistics
    • Replies: 0
    • Views: 1,359
    01-27-2015, 01:34 PM Go to last post
  18. How to model/test the accuracy of a computer simulation vs real life?

    I want to do a project where I see how accurate FIFA 14 is at simulating soccer. I am planning to simulate a full Premier League season by using the...

    Started by johnforelli‎, 01-26-2015 10:57 PM
    • Replies: 0
    • Views: 1,238
    01-26-2015, 10:57 PM Go to last post
  19. Randomized Block ANOVA

    While reading through my lecture notes, I came across a randomized block ANOVA model and some assumptions. What intermediate steps did the authors...

    Started by bvl0002‎, 01-26-2015 05:19 PM
    anova, expectation, variance
    • Replies: 0
    • Views: 1,345
    01-26-2015, 05:19 PM Go to last post
  20. Least Squares Estimation Equivalent

    So I came across an example in my Longitudinal Data Analysis book (attached) and I don't exactly understand how they are able transition into the...

    Started by rotundables‎, 01-26-2015 01:09 PM
    • Replies: 1
    • Views: 887
    01-26-2015, 01:57 PM Go to last post
  21. Cool Different Sample sizes in 3 way contingency tables

    Hi there ;) I am looking at the relationship between two variables age (young/old) and income (low/medium/high), using a contingency table as...

    Started by Humpty Dumpty‎, 01-26-2015 12:24 PM
    • Replies: 0
    • Views: 1,592
    01-26-2015, 12:24 PM Go to last post
  22. Determining Nature of Regression Analysis

    I have the following dependant and four independent variables: Dependant  Ratio -- this is actually a count, but IDK if that makes it a ratio...

    Started by TMF‎, 01-26-2015 07:26 AM
    • Replies: 3
    • Views: 1,704
    01-26-2015, 10:14 AM Go to last post
  23. How to calculate the distance from the mid-point of a Likert scale using the mean?

    I've recently completed a survey which offers respondents options from 1 (Strongly agree) through to 5 (Strongly disagree). This has allowed me...

    Started by mint911‎, 01-26-2015 07:58 AM
    • Replies: 1
    • Views: 1,378
    01-26-2015, 08:48 AM Go to last post
  24. Forget how to normalize to a range

    I used to know how... I want to normalize a set of data to -2.5 to 2.5, but I only remember how to do between 0 and 1, any help or references would...

    Started by alias123‎, 01-26-2015 06:04 AM
    • Replies: 1
    • Views: 1,553
    01-26-2015, 08:17 AM Go to last post
  25. I am sure I am overthinking this...

    HI, I am a graduate nursing student taking an informatics course. I am doing some review questions that really are basic, and like I said , I am...

    Started by purplelayne‎, 01-25-2015 11:13 PM
    • Replies: 0
    • Views: 1,695
    01-25-2015, 11:13 PM Go to last post
  26. Confidence interval

    I calculated a 95% confidence interval around a the response rate I got from a list of people age 30-39. How else can I test this response rate and...

    Started by niche‎, 01-25-2015 04:15 PM
    • Replies: 0
    • Views: 2,593
    01-25-2015, 04:15 PM Go to last post
  27. Cronbach Alpha vs Pearson r

    Hi all, this might sound like a completely amateurish question but...what is the practical difference between cronbach's alpha and the Pearson...

    Started by dgi‎, 06-06-2012 05:13 AM
    2 Pages
    1 2
    • Replies: 25
    • Views: 38,245
    01-25-2015, 05:51 AM Go to last post
  28. Procedure for performing a spanning Test in portfolio optimisation

    Hi, Please I've got the attached sets of portfolio data and would be grateful if anybody with a better knowledge in this topic could put me through...

    Started by Tbezia‎, 01-24-2015 08:08 PM
    • Replies: 0
    • Views: 2,685
    01-24-2015, 08:08 PM Go to last post
  29. Regression

    Help. My daughter has posted this to me for help to understand this equation. She needs to get 3 facts from it. She have exams in Business...

    Started by roabol‎, 01-24-2015 12:08 PM
    • Replies: 3
    • Views: 2,228
    01-24-2015, 06:10 PM Go to last post
  30. Need help analyzing my data for a research project.

    Kind of embarrassed to ask basic stats questions, but it's been a solid decade since I've had to design my own study. I'm doing a retrospective study...

    Started by scsguy‎, 01-23-2015 05:35 PM
    • Replies: 2
    • Views: 2,362
    01-24-2015, 08:59 AM Go to last post
  31. Question Calculate Sigma and µ for a normal distribution

    Hallo! I don't know how to solve the following problem: A company manufactures automobile parts. If a part has a diameter between 19.9mm and...

    Started by firona‎, 01-23-2015 04:15 AM
    • Replies: 2
    • Views: 2,330
    01-24-2015, 04:37 AM Go to last post
  32. Post Continuous or categorical variable

    Hi guys, I'm currently enrolled in a medical statistics course and I'd like some help with a problem I'm facing. I have a dataset that contains...

    Started by MaxTalksStats‎, 01-23-2015 10:26 AM
    • Replies: 14
    • Views: 2,224
    01-23-2015, 06:02 PM Go to last post
  33. Confidence interval for pooled variance of multiple populations?

    Given: -10 data sets from different populations -20 measurements per data set -Each data set has a statistically different mean -The variance...

    Started by Clk‎, 01-22-2015 09:46 PM
    • Replies: 1
    • Views: 1,631
    01-23-2015, 06:21 AM Go to last post
  34. Standard Deviation of a Sequence of Standard Deviations

    Hi, My goal is to estimate arrival times of buses at bus stops where historical GPS data for each bus is available and real-time bus location is...

    Started by mattbrenner‎, 01-22-2015 11:06 AM
    combining, standard deviation
    • Replies: 1
    • Views: 1,106
    01-22-2015, 08:54 PM Go to last post
  35. Help with hypothesis forming

    Hi All, I am newbie to statistics. When I read the literature regarding null hypothesis, I understand that the null hypothesis should always...

    Started by philip.coggle‎, 01-21-2015 04:54 PM
    null hypothesis
    • Replies: 4
    • Views: 1,329
    01-22-2015, 03:49 PM Go to last post
  36. What is seasonality and how is it defined?

    Let's say that I have a univariate dataset pertaining to sales and people claim that the sales numbers follow a seasonal pattern. I get that when...

    Started by amathew‎, 01-22-2015 11:14 AM
    • Replies: 5
    • Views: 2,961
    01-22-2015, 12:24 PM Go to last post
  37. Customized tables

    Dear All, I need to create two tables (please see the example in attached in xls. file). How to create those? Many thanks, Marii

    Started by Marii Mere‎, 01-22-2015 11:37 AM
    • Replies: 0
    • Views: 1,212
    01-22-2015, 11:37 AM Go to last post
  38. T-test .. new student pls help

    Hi everyone .. I'm new to the forum and need help in my new class. I have two questions can someone be kind the explain what I need to do? 1....

    Started by mjsbeauty‎, 01-21-2015 04:22 PM
    • Replies: 7
    • Views: 2,173
    01-22-2015, 10:53 AM Go to last post
  39. Want to learn more stats and how to use R for free?

    Not sure if the forum permits it, but just a quick plug that Stanford just launched a statistics class that would run from January to April to learn...

    Started by Injektilo‎, 01-21-2015 07:33 PM
    • Replies: 1
    • Views: 1,016
    01-22-2015, 12:56 AM Go to last post
  40. Which analysis should I use, and how?

    Hi guys, I am quite new to statistics, but I am trying to write a paper on tax compliance costs, and I am now looking for ways to analyse the...

    Started by BabyJane‎, 01-18-2015 03:17 PM
    • Replies: 12
    • Views: 3,518
    01-21-2015, 12:01 PM Go to last post
  41. Correlation with a nominal variable?

    Hello, I'm conducting a research project where I'm trying to find the correlation between the LSI-R total score (survey) and recidivism (if the...

    Started by laddergoat‎, 05-19-2010 11:08 AM
    • Replies: 14
    • Views: 32,384
    01-21-2015, 08:43 AM Go to last post
  42. Resampling for pseudo-sample size calculation

    Hey, I have a multiple logistic regression model with four binary independent variables (IV) with an additional interaction term (consisting of...

    Started by hlsmith‎, 01-20-2015 12:34 PM
    • Replies: 4
    • Views: 2,755
    01-20-2015, 10:01 PM Go to last post
  43. Entering interaction terms

    I am new to this site, but have high hopes that I can find some relief. I have a question regarding entering interaction terms (moderation) in...

    Started by aosborn‎, 01-20-2015 01:59 PM
    interaction, logistic regression, moderate, spss
    • Replies: 6
    • Views: 1,449
    01-20-2015, 08:14 PM Go to last post
  44. Identifying data for which variance is isolated to a few observations

    The problem I'm running into has to do with biological data, but is not specific to a biological system, and I suspect the answer is fairly...

    Started by laurasaur‎, 01-20-2015 04:32 PM
    • Replies: 4
    • Views: 1,492
    01-20-2015, 06:33 PM Go to last post
  45. Is it statistically correct to conduct ANOVA upon the R-squares evolution?

    Hello everybody, My issue is basically the question exposed in the title. I have a model where 5 factor explain the variance of the DV....

    Started by Guillon_‎, 01-20-2015 09:02 AM
    anova, r-squares
    • Replies: 1
    • Views: 1,013
    01-20-2015, 09:28 AM Go to last post
  46. Finding Generalized Linear Ratio Test Statistic for binomial distrributions

    Suppose that X is a random variable with that follows a binomial distribution with parameters n and p_x. And let Y be a random variable independent...

    Started by raidernation‎, 01-19-2015 11:54 AM
    • Replies: 0
    • Views: 1,236
    01-19-2015, 11:54 AM Go to last post
  47. physio

    Hi please help! I am trying to figure out which/what stat(s) to use for my quasi-experimental design. There are 2 non randomized groups they...

    Started by Daryl K‎, 01-18-2015 11:42 PM
    • Replies: 2
    • Views: 1,452
    01-19-2015, 11:45 AM Go to last post
  48. Basic question

    Suppose my null hypothesis is “Not more than 50% person prefer milk” and alternate hypothesis is “More than 50% (or majority) prefer milk”. Actually...

    Started by RCS‎, 01-18-2015 02:08 AM
    binomial test, hypothesis test, survey analysis
    • Replies: 1
    • Views: 1,429
    01-18-2015, 07:49 AM Go to last post
  49. Statistical Problem..Need assistance.

    How do I know what alpha level to use in a statistical problem that doesn't give one? Is the p-value for z=6.75 = 0.0001? Finally, how do I...

    Started by duckduck‎, 01-17-2015 01:11 AM
    • Replies: 3
    • Views: 1,471
    01-17-2015, 02:40 PM Go to last post
  50. Standard Deviation of Mean Absolute Error

    Hi guys, As basic as this question is, I'm looking for a way to calculate standard deviation of mean absolute error using pivot table or atleast...

    Started by excelmac‎, 01-17-2015 12:03 PM
    standard deviation
    • Replies: 1
    • Views: 1,662
    01-17-2015, 02:10 PM Go to last post
  51. Large sample sizes in Chi-Square goodness-of-fit test

    I'm evaluating six methods that estimates the time when events happen. I have 64'185 events that goes in to 48 bins (one per 30-minutes interval in a...

    Started by user41223‎, 01-15-2015 02:56 AM
    • Replies: 2
    • Views: 1,654
    01-17-2015, 08:34 AM Go to last post
  52. Which statistical test to use?

    Hi Guys, I have two datasets that I need to compare for means, but one is much larger than the other. One has about 2000 records, and other about...

    Started by EricaW‎, 01-16-2015 05:44 PM
    • Replies: 1
    • Views: 758
    01-17-2015, 05:05 AM Go to last post
  53. Expected utility of portfolio problem

    No answers

    Started by Stats2‎, 01-16-2015 04:05 PM
    • Replies: 0
    • Views: 1,182
    01-16-2015, 04:05 PM Go to last post
  54. Appropriate SAS test for comparing within and between seasons?

    I am a new animal science/agronomy grad student trying to analyze my data. I have a very limited stats background (one class with an interesting...

    Started by tio03‎, 01-16-2015 03:54 PM
    • Replies: 0
    • Views: 767
    01-16-2015, 03:54 PM Go to last post
  55. Gold Standard vs. New Technology

    Please delete thread.

    Started by AmateurStat‎, 01-15-2015 10:52 AM
    • Replies: 7
    • Views: 2,374
    01-16-2015, 03:52 PM Go to last post
  56. Density function of the mixture of two NHPP

    I'd like to know how can I calculate the density function of the mixture of two non-homogeneous Poisson process? I should mention that I have the...

    Started by Ferra‎, 01-14-2015 03:00 PM
    kernel density, nhpp
    • Replies: 7
    • Views: 1,868
    01-16-2015, 02:20 PM Go to last post
  57. Is there ANOVA way?

    Please delete thread.

    Started by AmateurStat‎, 01-16-2015 10:02 AM
    • Replies: 1
    • Views: 1,583
    01-16-2015, 12:55 PM Go to last post
  58. Missing value treatment for categorical & continues variables and testng MCAR/MAR

    Hello everybody, My dataset (N=90) consists of ordinal variables serving as IVs and dichotomous and continuous variables serving as DVs. IVs and...

    Started by therp‎, 11-14-2013 02:52 PM
    categorical data, estimation maximization, mcar, missing values, multiple imputation
    • Replies: 2
    • Views: 4,491
    01-16-2015, 09:08 AM Go to last post
  59. sample size calculation for paired proportions when one discordant pair is 0

    Hello! I am trying to calculate sample size for a study using paired data. My groups are such that one discordant pair will always be 0. I...

    Started by katie1485‎, 01-15-2015 04:43 PM
    mcnemar, power, sample size
    • Replies: 1
    • Views: 1,707
    01-15-2015, 04:47 PM Go to last post
  60. Minimum Detectable Difference for Two-Sample t-Test for Means

    Dear all, I was looking for a method for posthoc calculation of the minimum detectable difference for Two-Sample t-Test and I came across this...

    Started by andhou‎, 01-15-2015 06:00 AM
    • Replies: 0
    • Views: 3,124
    01-15-2015, 06:00 AM Go to last post

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