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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: 196,968
    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: 66,862
    09-30-2005, 09:44 AM Go to last post
  1. Question Question about Bayesian statistical test and p vlaue

    Just started to learn about Bayesian inference. I have no problem with Bayesian Theorem. But it's very confusing comming to Bayesian inference. Here...

    Started by JoAnnaKim‎, 07-01-2013 10:02 PM
    • Replies: 0
    • Views: 1,256
    07-01-2013, 10:02 PM Go to last post
  2. Help with creating regression model for some data I have collected

    before I start I apologise for not using all the correct terminology(some of it eludes me at this stage)... So i have collected a variety of data...

    Started by urbano‎, 07-01-2013 04:23 AM
    • Replies: 3
    • Views: 1,431
    07-01-2013, 09:56 PM Go to last post
  3. Unhappy Calculate expected value and variance.

    Xi are IID following geometric distrition (i=1..n). Y=1/(a+Sum(Xi)), where a is known constant. How to calculate E and Var(Y). Many thanks. ...

    Started by JoAnnaKim‎, 07-01-2013 03:49 PM
    • Replies: 6
    • Views: 1,547
    07-01-2013, 05:59 PM Go to last post
  4. How to do this hypothesis test about Bernoulli process

    Hi, I'm stuck with this question about Bernoulli process. Could someone give me some clue? First define experiment A as Repeat a Bernoulli...

    Started by learnstat‎, 06-28-2013 07:54 PM
    • Replies: 7
    • Views: 2,360
    06-30-2013, 06:54 PM Go to last post
  5. Create Multivariate Linear Model in Matrix Notation

    Two spider species (A and B) areto be compared to see eats flies quickest. One hundred flies are released into a cage, and one spider of each...

    Started by simplemts‎, 06-29-2013 11:08 PM
    • Replies: 7
    • Views: 1,738
    06-30-2013, 04:39 PM Go to last post
  6. How to determine what IV is the best predictor of DV? Advice appreciated

    I work in real estate. I am trying to determine what quantitative characteristic is the most reliable indicator of sale price. In other words, in...

    Started by brownguitarman‎, 06-30-2013 12:42 PM
    economics, real estate, regression, statistics, variance
    • Replies: 1
    • Views: 1,069
    06-30-2013, 03:04 PM Go to last post
  7. Post-hoc vs sensitivity vs sub-group vs meta-regression analyses

    Hello, newbie here! Firstly - apologies if this is not the forum to be asking really basic stats questions, but I'm struggling with a few bits of...

    Started by badgerhead‎, 06-30-2013 03:08 AM
    • Replies: 0
    • Views: 1,659
    06-30-2013, 03:08 AM Go to last post
  8. Best book on mathematical statistics

    Hi Please advice me a good book on mathematical statistics.I want it to be oriented in math students or engineering level. Best Regards

    Started by drunkenphd‎, 06-29-2013 02:09 PM
    • Replies: 2
    • Views: 7,846
    06-29-2013, 10:45 PM Go to last post
  9. Multivariate Regression - Errors & Design Matrix [Theory]

    Suppose you have an experiment with the design matrix X' = 2x4 Matrix Is it true that e^1 + 2e^2 + e^4 = 0 Show your calculations. My...

    Started by simplemts‎, 06-28-2013 03:30 PM
    • Replies: 2
    • Views: 1,624
    06-29-2013, 10:44 PM Go to last post
  10. How does test difficulty affect correlations?

    Hi, Can anyone help me here, I know that if you have one difficult test/task and one less difficult that the correlation between them would be...

    Started by markoz‎, 06-28-2013 04:16 AM
    • Replies: 1
    • Views: 1,343
    06-29-2013, 01:31 AM Go to last post
  11. Multivariate Multiple Regression - multivariate tests

    Hi guys, I need to really understand Wilks' Lambda, Roy's greatest root and other multivariate tests but IN THE CONTEXT OF MULTIVARIATE MULTIPLE...

    Started by Axs_Souza‎, 06-29-2013 01:25 AM
    multivariate regression, multivariate tests, roy's greatest root, wilks' lambda
    • Replies: 0
    • Views: 1,218
    06-29-2013, 01:25 AM Go to last post
  12. How to rescale variables measured on different scales to be the same?

    This is a situation when z-transformation will not help. Specifically -- I have longitudinal data and my DV of interest is measured on a certain...

    Started by sem‎, 06-27-2013 11:14 PM
    • Replies: 2
    • Views: 1,741
    06-28-2013, 03:19 PM Go to last post
  13. Regression analysis: selecting TREND or FORECAST formula

    Hello, I am doing a regression analysis on average price increases from a PPI table, and my goal is to project a 2013 value using the average...

    Started by rdipr‎, 06-25-2013 09:05 AM
    excel, forecast, regression analysis, trend
    • Replies: 1
    • Views: 2,134
    06-28-2013, 09:39 AM Go to last post
  14. Need help to compute a stat or two

    I wish to augment some software I've been developing with some statistical output, but I haven't been able to work out how to do it. Here's an...

    Started by SPB‎, 06-27-2013 11:05 PM
    • Replies: 0
    • Views: 1,096
    06-27-2013, 11:05 PM Go to last post
  15. Regression not correct model?

    Hello everyone. I would like to develop a model that would "predict" future pre-payment rates of a given pool of loans. The question I have is, if...

    Started by Anotherdream‎, 06-27-2013 11:42 AM
    • Replies: 3
    • Views: 1,273
    06-27-2013, 05:38 PM Go to last post
  16. Dummy variable trap help

    Hey guys, I have 3 groups of dummy variables (country, year, industry). I know that normally one dummy is supposed to be dropped to avoid the trap,...

    Started by Spirods‎, 06-27-2013 05:09 PM
    • Replies: 0
    • Views: 1,718
    06-27-2013, 05:09 PM Go to last post
  17. Red face Which test to be used?

    Hi everybody, I need to analyze possible differences in the invertebrates populations living in 3 different environmental treatments (3 plus 3...

    Started by Robert87‎, 06-27-2013 04:15 PM
    invertebrates, minitab, nested, population, spss
    • Replies: 0
    • Views: 1,235
    06-27-2013, 04:15 PM Go to last post
  18. Wink Intresting In Statistics

    Hi , I hope you all of you fine if any wanna intrested or want to work together, or publishing the paper he can contact with me, I will help all of...

    Started by ameeq7746‎, 06-27-2013 12:39 PM
    • Replies: 0
    • Views: 1,178
    06-27-2013, 12:39 PM Go to last post
  19. Recommend a statistics book for data analysis (SPSS/sigmastas/excel/metlab etc)

    Hello, Is there a book which I can read which helps me speed up my knowledge on statistics analysis using the software? I have come upon:...

    Started by mystvearn‎, 07-26-2008 07:11 AM
    • Replies: 5
    • Views: 4,435
    06-27-2013, 06:35 AM Go to last post
  20. Testing data to determine proficiency.

    Hi, I have been giving a work project and I believe that I need to use t-tests to get to my results, but don't know what results I need to get to...

    Started by DSL1970‎, 06-26-2013 05:41 PM
    hypothesis testing, sample groups, t-tests
    • Replies: 0
    • Views: 1,528
    06-26-2013, 05:41 PM Go to last post
  21. combining correlations/regressions

    Currently working on a project testing several variables related to battery lifespan. With the 20 or so variables I have tested, I have determined...

    Started by tbb‎, 06-26-2013 02:26 PM
    • Replies: 0
    • Views: 1,119
    06-26-2013, 02:26 PM Go to last post
  22. Correlation and range

    Background: I am working on this project that examines the relationship between battery life and several variables. However my specific question...

    Started by tbb‎, 06-26-2013 11:33 AM
    correlation
    • Replies: 1
    • Views: 1,102
    06-26-2013, 12:13 PM Go to last post
  23. Relevant statistical method to analyze data

    I want to compare two management accounting practices (ABC and TDABC) in order to find out which one is more effective. Effectiveness will be...

    Started by ishara‎, 06-26-2013 12:20 AM
    • Replies: 2
    • Views: 1,554
    06-26-2013, 11:59 AM Go to last post
  24. CI Question?

    What do the size of the boxes in the 95% CI mean? Is it just the weight of the sample? ...

    Started by Matt1147‎, 06-26-2013 09:19 AM
    • Replies: 5
    • Views: 1,537
    06-26-2013, 09:39 AM Go to last post
  25. hypothesis testing and CI for proportions

    Hello I am confused, when making inference on one proportion, using the Z approximation, we put \hat{p} under the square root (the standard...

    Started by Yankel‎, 06-25-2013 04:29 AM
    • Replies: 1
    • Views: 924
    06-25-2013, 10:03 PM Go to last post
  26. Calculating Representative Sample Size - Appropriate?

    Hello, In my organization, I work alot with surveying. Typically, when I need to know what the appropriate sample size would be, given a known...

    Started by Izzle‎, 06-25-2013 09:56 PM
    • Replies: 0
    • Views: 2,069
    06-25-2013, 09:56 PM Go to last post
  27. Probability of values lieing between a minimum and maximum value

    Hello, I'm hoping for some help on the following issue. Given a population of N=400. Each element represents the length of a part that should lie...

    Started by maq‎, 06-20-2013 12:19 PM
    • Replies: 3
    • Views: 2,215
    06-25-2013, 07:58 AM Go to last post
  28. Standardizing 2 data points

    Hi, I was wondering if you have a mean and SD for 2 data points (i.e., debt and salary) is it possible/wise/statistically sound to combine these...

    Started by baddeleywm‎, 06-25-2013 05:54 AM
    • Replies: 0
    • Views: 1,520
    06-25-2013, 05:54 AM Go to last post
  29. Variance Ratio

    Hello all I have a question regarding hypothesis testing. From a population X we take a sample of size 10. The sample variance is 16. From a...

    Started by Yankel‎, 06-25-2013 01:21 AM
    • Replies: 2
    • Views: 1,197
    06-25-2013, 04:27 AM Go to last post
  30. Determining which sample is larger by looking at...

    Group---R-----R2-----R2adj 1-------0.79--0.62---.34 2-------0.83--0.69---.68 Is it possible to say that one of these groups has a larger sample?

    Started by userfriendly‎, 06-25-2013 03:43 AM
    • Replies: 0
    • Views: 958
    06-25-2013, 03:43 AM Go to last post
  31. H0 is true, then MSb/MSw=1 Why?

    If the null is true, i.e. no effect of the independent variable on the dependent variable, theoretically the ratio between MSb and MSw should be...

    Started by userfriendly‎, 06-25-2013 03:26 AM
    • Replies: 0
    • Views: 1,838
    06-25-2013, 03:26 AM Go to last post
  32. Factor Extraction in SPSS

    What are the reasons I am unable to complete a factor extraction in SPSS using maximum liklihood. When I attempt to perform it, it says "Attempted to...

    Started by Shannon3232‎, 06-24-2013 10:15 PM
    • Replies: 1
    • Views: 1,739
    06-24-2013, 11:59 PM Go to last post
  33. Is it possible to use paired t-test to compare changes in multiple subjects?

    I have designed 5 different controllers for a biomechanical model, and I quantify how each controller performs by applying each to a standard set of...

    Started by statsSeeker‎, 06-24-2013 08:31 PM
    • Replies: 0
    • Views: 1,988
    06-24-2013, 08:31 PM Go to last post
  34. non-central chi-square distribution.

    If X_i is distributed as normal with mean \mu and variance-covariance matrix D,where D is the diagonal matrix, then show that X^TD^{-1}D is...

    Started by Jesmin‎, 06-24-2013 03:59 AM
    chi-square, statisics, transformation, transition matrix
    • Replies: 3
    • Views: 1,739
    06-24-2013, 10:47 AM Go to last post
  35. Trend Analysis on Positive and Negative Data by Department

    I work for a company where I am developing a trend analysis tool to analyze various data. My specialty is in the area of Access...

    Started by klangst‎, 06-24-2013 08:42 AM
    • Replies: 0
    • Views: 2,489
    06-24-2013, 08:42 AM Go to last post
  36. Geometric mean of normally distributed independent random variables

    Hi all, I have a large set of identical normally distributed random variables, all positive and independent, with the same known Mu and Sigma for...

    Started by ErnoB‎, 02-23-2012 06:08 PM
    • Replies: 5
    • Views: 8,705
    06-24-2013, 06:53 AM Go to last post
  37. What will be the transformation and Jacobian of transformation for the following case

    Let X_i\sim N(\mu_i,\sigma^2) ; where show that \bar X and (X_i-\bar X) are independent. If all X_i had same mean \mu then we transform the...

    Started by Jesmin‎, 06-23-2013 09:23 PM
    chi-square, normal distribution, statisics, transformation
    • Replies: 1
    • Views: 1,949
    06-23-2013, 09:47 PM Go to last post
  38. [response set analysis] respondents unaware of negative formulated items

    Hi Iím wondering what to do when negative items does not break response set. In other words, it remain unclear if respondent was where of the...

    Started by Patrick@RU‎, 06-23-2013 10:58 AM
    response set analysis
    • Replies: 0
    • Views: 1,842
    06-23-2013, 10:58 AM Go to last post
  39. Checking the Independence.

    Let X_i\sim N(\mu,\sigma^2) ; where Z_i\sim N(0,1) ; where Proof that \frac{(\bar X-\mu)}{\sigma} and \sum_{i=1}^n\frac{(X_i-\bar...

    Started by Jesmin‎, 06-22-2013 10:25 AM
    inde, independency, sampling, statistics
    • Replies: 2
    • Views: 1,621
    06-22-2013, 09:06 PM Go to last post
  40. Factor Analysis: Creating Reliable Scales

    Hello all. I have a question I hope someone can help me with. I items which I have run PCA on and come up with 8 factors from about 20 vairables....

    Started by DMCH‎, 06-21-2013 12:08 PM
    factor analysis, pca, scales
    • Replies: 3
    • Views: 1,590
    06-22-2013, 03:27 PM Go to last post
  41. p-value associated with Kruskal Wallis with multiple comparison?

    I have a data set that shows the differences between 3 different controllers of a biomechanical system on the same performance metric (specifically,...

    Started by statsSeeker‎, 06-22-2013 03:18 PM
    kruskal-wallis anova, multiple comparison, p-value
    • Replies: 0
    • Views: 1,437
    06-22-2013, 03:18 PM Go to last post
  42. Is repeated measures ANOVA appropriate for my data set?

    My project involves designing various controllers of a biomechanical system, and then once the controller design is complete, testing each controller...

    Started by statsSeeker‎, 06-22-2013 01:37 PM
    kruskal-wallis anova, repeated measures anova
    • Replies: 0
    • Views: 1,241
    06-22-2013, 01:37 PM Go to last post
  43. Cumulants of non central chi-square distribution

    Cumulant generating function is defined by logarithm of Moment generating function. K_X(t)=\log M_X(t) let X is a non central \chi^2 variate...

    Started by Jesmin‎, 06-21-2013 10:23 PM
    chi square, sampling, statisics
    • Replies: 2
    • Views: 2,913
    06-22-2013, 09:59 AM Go to last post
  44. How do you report Fisher's Least Significant Differences results?

    Hi, I've been looking online to see how to report LSD results but I cannot find anything anywhere! I understand for a lot of post hoc/planned...

    Started by Vickstar‎, 06-22-2013 08:33 AM
    • Replies: 0
    • Views: 1,245
    06-22-2013, 08:33 AM Go to last post
  45. Assumptions of a 2 proportion z-test - help!

    Hello, I recently inherited an excel workbook from someone who transferred out of my current company. Within this workbook, He was comparing...

    Started by Izzle‎, 06-20-2013 07:22 AM
    • Replies: 1
    • Views: 2,639
    06-22-2013, 03:43 AM Go to last post
  46. An Exercise of noncentral [math]\chi^2[\math] distribution.

    Let Y_1,\ldots,Y_n be independent random variables with Y_k distributed as N\sim(a_k,\sigma^2) , and \bar Y=\sum_{k=1}^{n}\frac{Y_k}{n} denote the...

    Started by Jesmin‎, 06-21-2013 09:20 PM
    chi square, sampling distribution, statisics
    • Replies: 0
    • Views: 1,190
    06-21-2013, 09:20 PM Go to last post
  47. Appropriate analysis

    Hi, Im looking at running a non-parametric test on ranked data. I have two variables. Each subject completed two conditions which included 3...

    Started by irishstat‎, 06-21-2013 04:46 AM
    • Replies: 1
    • Views: 1,509
    06-21-2013, 09:20 AM Go to last post
  48. calculating p-value from resampling of the null distribution

    Hi all, i am a PhD student in Bioinformatics and i'm dealing with some statistics issue in my reasearch; i was hoping you could lend me a hand :D ...

    Started by Slacanch‎, 06-21-2013 08:21 AM
    monte carlo, null distribution, p-value, sampling
    • Replies: 0
    • Views: 1,942
    06-21-2013, 08:21 AM Go to last post
  49. How to generate optimal values of the weights

    How do I generate optimal values of weights for index in Excel?

    Started by Rashmii‎, 06-21-2013 07:23 AM
    weights
    • Replies: 1
    • Views: 2,102
    06-21-2013, 07:27 AM Go to last post
  50. Patient data - Choosing the Right Model

    Hello, I just finished up my first year as a statistics major and have been assigned a summer project from my employer at the hospital near my...

    Started by grasshopperanalyst‎, 06-19-2013 07:07 PM
    data model, disease, healthcare, neural networks, r-software
    • Replies: 4
    • Views: 1,647
    06-21-2013, 03:15 AM Go to last post
  51. Question about calculating standard errors with BRR replicate weights

    Iím analyzing a survey (the PSS) in which each respondent is a school. Iíve been provided with 88 BRR replicate weights which I was hoping to use to...

    Started by glad567‎, 06-20-2013 06:08 PM
    statistics
    • Replies: 0
    • Views: 1,584
    06-20-2013, 06:08 PM Go to last post
  52. Statistical analysis question

    In my study I am looking at whether social class & race of a job applicant influence the applicantís job promotionÖso IV1 = social class of...

    Started by norajones‎, 06-18-2013 02:51 PM
    • Replies: 10
    • Views: 1,925
    06-20-2013, 03:46 PM Go to last post
  53. A uniform distribution problem

    A person's score in a test is uniformly distributed over . She is permitted three attempts at the test. However, after the first attempt, she is...

    Started by HarishD‎, 06-19-2013 11:51 PM
    exercises, samples, uniform distribution
    • Replies: 2
    • Views: 1,532
    06-20-2013, 01:40 PM Go to last post
  54. Modeling overlapping groups

    What I am trying to do is show hiring managers how adding a number of seemingly reasonable requirements to a job may reduce the number of candidates...

    Started by InstableIguana‎, 06-20-2013 10:42 AM
    • Replies: 4
    • Views: 1,124
    06-20-2013, 01:34 PM Go to last post
  55. Which test should I use for multiple variables, multiple sites & non-parametric data?

    Hi All, I've spent the past two weeks trying to figure out which test to use and have gotten nowhere so hoping someone here can help! I have been...

    Started by LizVango‎, 06-19-2013 03:34 PM
    kruksall-wallis, mancova, statistics, variables
    • Replies: 4
    • Views: 1,368
    06-20-2013, 01:12 PM Go to last post
  56. Difference in Profit Proportions

    What test can I use to determine if two profit percentages are statistically different? ex. In 2011 a company sold $200 worth of products with $50...

    Started by StatManLV‎, 06-20-2013 09:20 AM
    • Replies: 0
    • Views: 867
    06-20-2013, 09:20 AM Go to last post
  57. Assumptions MWU-Test

    Hi, I just donít know how to go on with my research at the moment, I havenít found answers to my questions in any forums or papers, so it would be...

    Started by fuchsmiez‎, 06-20-2013 07:12 AM
    likert scale, mann-whitney u
    • Replies: 0
    • Views: 1,637
    06-20-2013, 07:12 AM Go to last post
  58. Determining the p-value of an H0: A≠B

    I noticed that there seemed to be a relation between 2 variables I measured on an experiment. I got the correlation coefficient and the slope for...

    Started by fuidcoap‎, 06-06-2013 07:35 PM
    • Replies: 1
    • Views: 18,040
    06-20-2013, 03:23 AM Go to last post
  59. Which Test should I use

    Hi. A have a group of 200 law students who have finished their first year. They have completed a total of 7 courses. I am interested in being able to...

    Started by ANXIETYPRONE‎, 06-19-2013 04:17 PM
    • Replies: 1
    • Views: 1,314
    06-20-2013, 03:01 AM Go to last post
  60. MLE of multinomial distribution with missing values

    Hi, I am trying to solve a problem and the results I get seem counter-intuitive. We randomly throw n balls into an area partitioned into 3 bins...

    Started by bit‎, 06-19-2013 01:05 PM
    maximum likelihood, missing data, multinomial, probability
    • Replies: 5
    • Views: 1,741
    06-19-2013, 08:17 PM Go to last post

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