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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: 196,722
    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: 66,733
    09-30-2005, 09:44 AM Go to last post
  1. L1 distance between empirical and true distribution for discrete distributions

    I have a discrete distribution over the set {1, \ldots, d} with a corresponding pmf P. Given a dataset with n i.i.d. samples from P, I compute the...

    Started by jyojyon‎, 10-18-2014 01:39 PM
    density estimation, empirical distribution
    • Replies: 0
    • Views: 1,724
    10-18-2014, 01:39 PM Go to last post
  2. Regression model with no constant term & more

    Hi guys, There are a bunch of things that I'm getting confused about and while I've researched online for resources to get clarification, I'm...

    Started by excelmac‎, 10-18-2014 10:28 AM
    no constant term model, regression, time series
    • Replies: 2
    • Views: 2,148
    10-18-2014, 11:21 AM Go to last post
  3. "Linear at the Parameters"

    I'm having a hard time with this concept. I've read as many different sources on this terminology as I can find, but it seems that most of them...

    Started by JTWood‎, 10-18-2014 07:31 AM
    • Replies: 5
    • Views: 2,275
    10-18-2014, 09:09 AM Go to last post
  4. Independents and dependents Events

    I've been sitting on this problem for awhile. i cannot figure it out. i looked in the back of the book for the answer ( independent; .000507) i've...

    Started by iDoThis‎, 09-24-2014 09:29 PM
    • Replies: 1
    • Views: 4,288
    10-17-2014, 08:19 PM Go to last post
  5. Partial Correlation

    Hello everybody, normally I wouldn't use a forum but this is a last resort. 3. SQ3: Is there a linear relationship between engine size and...

    Started by jfrancx‎, 10-17-2014 05:47 PM
    • Replies: 0
    • Views: 1,174
    10-17-2014, 05:47 PM Go to last post
  6. Type I and Type II Error

    Let {X1, X2, ..., X25} be a random sample of 25 observations from a normal population havingmean μ and variance 2. Define the null hypothesis H0 : μ...

    Started by oharman‎, 10-17-2014 07:34 AM
    • Replies: 3
    • Views: 1,065
    10-17-2014, 02:38 PM Go to last post
  7. Testing is a sample has been rigged??

    Hello All, This is my first post so please be gentle, I did applied stats 22 years ago as part of my Physics degree but that was, well, 22 years...

    Started by Andy Carr‎, 10-17-2014 03:24 AM
    sample rigging random
    • Replies: 3
    • Views: 1,381
    10-17-2014, 02:37 PM Go to last post
  8. ANOVA contrast coding for 4 groups.

    Hello, I have four groups 1, 2, 3, and 4, and I'm trying to compare the average of 1 and 2 vs. group 3 and group 4 (note not the average of group...

    Started by mbetennis01‎, 10-17-2014 09:08 AM
    contrast coefficients
    • Replies: 2
    • Views: 2,664
    10-17-2014, 12:47 PM Go to last post
  9. Analysing a rank order

    Hi all, I am a doctor who have absolutely close to 0 knowledge about statistics. Here is my problem, Imagine a situation where 1000 students...

    Started by Lasitha‎, 10-12-2014 12:56 AM
    • Replies: 2
    • Views: 1,880
    10-16-2014, 10:03 AM Go to last post
  10. How to plot non-parametric data with multiple time points?

    Hello, I analyzed some physiologic data (blood electrolyte levels etc) which was fairly skewed, so I used Kruskal-Wallis to test for differences...

    Started by awolf‎, 10-16-2014 09:21 AM
    interquartile range, kruskal wallis, non-parameteric, plot, standard deviation
    • Replies: 0
    • Views: 950
    10-16-2014, 09:21 AM Go to last post
  11. Testing the Normality of Errors in Regression?

    Hi all, I have simple conceptual question: In the simple linear regression problem, where the true relationship is, y = ax + b + e the...

    Started by mity‎, 10-15-2014 10:57 AM
    correlated errors, normality, regresion analysis, residual
    • Replies: 4
    • Views: 2,674
    10-16-2014, 12:37 AM Go to last post
  12. What test to use for longitudinal data and to test interactions among factors?

    My study involves five plant varieties subjected to three cultivation methods in two different sites. Every week for six weeks, we record the...

    Started by ara_bidopsis22‎, 10-15-2014 05:28 AM
    anova, interactions, longitudinal data
    • Replies: 2
    • Views: 1,505
    10-15-2014, 11:09 PM Go to last post
  13. Which statistical test will return more power??

    Hello, I am performing an analysis for a study and I have a small sample size (N = 25). There are pre and post test scores for each person on...

    Started by Brianna‎, 10-14-2014 05:12 PM
    • Replies: 3
    • Views: 1,909
    10-15-2014, 03:38 PM Go to last post
  14. calculate the value of the appropriate test statistic?

    calculate the value of the appropriate test statistic? I have worked p-value and it is 0.23 can anyone help me with test value? thanks

    Started by tflow‎, 10-14-2014 06:02 AM
    • Replies: 6
    • Views: 2,965
    10-15-2014, 12:31 PM Go to last post
  15. Calculating the impact of Conversion decline

    On the attachment is a data table and I'm trying to understand the impact of the drop in Order Conversion from 2014 to 2013 by each Group (A-J). I...

    Started by razeudejavu‎, 10-15-2014 09:38 AM
    • Replies: 0
    • Views: 1,488
    10-15-2014, 09:38 AM Go to last post
  16. Making statistical statements on set of (unconnected) experiments

    Hi! I am currently in the last phase of my thesis project and need to perform “meta” analysis on my experiment data… as I am struggling with some...

    Started by falcop‎, 10-14-2014 05:40 AM
    • Replies: 2
    • Views: 1,428
    10-15-2014, 05:04 AM Go to last post
  17. find pmf by using mgf

    hi! I have problem to solve the question below..did i need to use Poisson distribution to solve this question or maybe not?? Find the probability...

    Started by ctaiza‎, 10-14-2014 11:43 PM
    • Replies: 1
    • Views: 3,500
    10-15-2014, 01:37 AM Go to last post
  18. Is this a British thing? "Relative Sampling Accuracy", Margin of Error and SE

    I'm not a student but I am reading a British textbook and have come across a term I have not seen before: Relative sampling accuracy. The author...

    Started by blue11‎, 10-14-2014 04:06 PM
    • Replies: 0
    • Views: 1,215
    10-14-2014, 04:06 PM Go to last post
  19. using mann whitney vs chi square

    Hi, I am wondering whether I should be using a chi square or a mann whitney test for comparing my data. I have two groups of people and want to...

    Started by jamie157‎, 10-02-2014 05:06 AM
    • Replies: 3
    • Views: 2,030
    10-14-2014, 05:10 AM Go to last post
  20. Interesting Stats Question: Verifying Algorithmic Trading Returns

    Hey guys, First off, thank you to anyone who helps out! I haven't been in statistics for a while and, quite honestly, learning the T-Test online...

    Started by ahouriani‎, 10-13-2014 09:33 PM
    • Replies: 0
    • Views: 1,220
    10-13-2014, 09:33 PM Go to last post
  21. binomial distributions (family size)

    particularly part B. Thanks! A couple with two girls has decided to keep having children until they have exactly two boys. The probability of a...

    Started by lkwokchu‎, 10-13-2014 01:04 AM
    • Replies: 2
    • Views: 2,039
    10-13-2014, 09:09 PM Go to last post
  22. Question Maximum likelihood estimation and GLMs - can you help me refresh my rusty memory?

    Hi all, I was wondering if you can help me refresh my rusty memory on maximum likelihood estimation. I think I remember the basic concept from...

    Started by JohnDoe2014‎, 10-09-2014 06:04 PM
    glm, maximum likelihood, regression
    • Replies: 5
    • Views: 3,741
    10-13-2014, 04:58 PM Go to last post
  23. How do you calculate the p-value by hand? Only learned how to do it electronically

    Hello, I am making a Java program that can run a full 1-sample z-test for sample mean and I would like to know how to calculate the p-value by...

    Started by solospirit‎, 10-13-2014 03:04 PM
    java, statistics, z-score
    • Replies: 6
    • Views: 3,997
    10-13-2014, 04:35 PM Go to last post
  24. Question Which test to run to check if sales incentives working across two quarters?

    hi all, I have a 200 person sales force selling product A. However, we acquired another services company which provide services to product A. Now...

    Started by statsnovice1‎, 10-13-2014 12:42 PM
    anova, correlation, f-test
    • Replies: 0
    • Views: 1,347
    10-13-2014, 12:42 PM Go to last post
  25. Non-parametric tests - still valid if your data are dominated by 0s and 1s?

    Hi everyone, I have a question about non-parametric tests and what to do when your data are dominated by low values (e.g. 0s and 1s)? I'll give an...

    Started by NCM‎, 10-13-2014 05:46 AM
    • Replies: 5
    • Views: 2,019
    10-13-2014, 12:03 PM Go to last post
  26. Post Explaining 'if' statements using mathematical notation

    :confused: I am having trouble converting rules into mathematical notation, and maybe someone could help?! What I have are two variables: ...

    Started by yccmp‎, 10-13-2014 03:09 AM
    • Replies: 3
    • Views: 1,642
    10-13-2014, 10:52 AM Go to last post
  27. gamma distribution

    kindly provide some hints The weekly amount of down time Y (in hours) for an industrial machine has approximately a gamma distribution with mean...

    Started by lkwokchu‎, 10-13-2014 01:01 AM
    • Replies: 1
    • Views: 2,897
    10-13-2014, 10:50 AM Go to last post
  28. Determining Course Selection Based on Mean and Standard Deviation

    How would I go about in determining the best course based on the mean and standard deviations from the following data: Class 1: mean=88.7%, SD=1.2...

    Started by Raybob‎, 10-12-2014 11:53 PM
    • Replies: 0
    • Views: 1,177
    10-12-2014, 11:53 PM Go to last post
  29. Comparing measured and calculated solar data

    I have created a program that outputs the average solar radiation available over a day for a specific location. I would like to statistically compare...

    Started by pepster‎, 10-12-2014 09:39 AM
    solar data comparison
    • Replies: 1
    • Views: 1,401
    10-12-2014, 07:41 PM Go to last post
  30. Demonstration of statistical indipendence in a two way table

    Hello at all guys There is someone which is able to demonstrate why , withi statistical indipendence, the conjoint frequency is the same of the...

    Started by davidecortellino‎, 10-05-2014 12:17 PM
    #indipendence, #twowaytable
    • Replies: 8
    • Views: 2,393
    10-12-2014, 08:45 AM Go to last post
  31. What test to get a P-Value?

    So I have a group of students all divided by different categories in response to a poll. There is a total of 34 students. Depending on each answer, I...

    Started by crisisinmedicine‎, 10-10-2014 02:08 PM
    categorical, data, pvalue, significant, stats
    • Replies: 6
    • Views: 2,278
    10-11-2014, 07:45 PM Go to last post
  32. Reverse Coding in GSS, Brief Explanation Requested

    I am doing a data analysis project in my statistics class and my professor liked all the data tables that I had found for my proposal and asked me to...

    Started by aaronbw‎, 10-11-2014 07:16 PM
    • Replies: 0
    • Views: 1,830
    10-11-2014, 07:16 PM Go to last post
  33. Red face Should I standardize response variables in a panel regression?

    Suppose I have the following Data Yit = price of one foreign currency in one US dollar, at time t, where i= different countries Xit=employment rate...

    Started by hewei2004‎, 10-11-2014 01:48 PM
    panel
    • Replies: 0
    • Views: 1,536
    10-11-2014, 01:48 PM Go to last post
  34. Smile Multiple Drug Treatment Effects

    Suppose I have five vitamins VA VB VC VD VE, and wish to study the effects of each drug on the weight of patients with data measured at daily...

    Started by hewei2004‎, 10-11-2014 01:43 PM
    treatment
    • Replies: 0
    • Views: 1,244
    10-11-2014, 01:43 PM Go to last post
  35. PCA or multidimensional scaling?

    Hi everyone, I have a set of chemical fingerprints of 10 plant samples of the same species. I did some LC/MS analysis and I identified the most...

    Started by robertson92‎, 10-10-2014 04:15 AM
    • Replies: 7
    • Views: 2,899
    10-11-2014, 12:07 PM Go to last post
  36. Which test?

    Hi, I have question which statistic test to use (if possible): I want to analyse the use of medicines after an intervention. The dataset includes...

    Started by bollibompa‎, 10-11-2014 06:42 AM
    • Replies: 1
    • Views: 1,162
    10-11-2014, 10:10 AM Go to last post
  37. Chi squared on binary presence/ absence data?

    Hi, I have a list of samples (10) and a list of compounds (about 250). I have generated a presence absence table in which the first column is the...

    Started by robertson92‎, 10-11-2014 02:22 AM
    • Replies: 6
    • Views: 2,775
    10-11-2014, 03:28 AM Go to last post
  38. Hello All : Need some help please re: Control Chart testing

    Hi All This is my first time posting here and im a bit of a statistics newbie but im have begun studying for my Six Sigma Blackbelt. One...

    Started by xbarcrawl‎, 10-10-2014 03:06 AM
    • Replies: 3
    • Views: 1,901
    10-10-2014, 07:22 AM Go to last post
  39. Individual Growth Modelling

    Hi All, I'm looking for help for a Multilevel analysis, Individual growth Curve. Basically I'm struggling how to set up correctly in SPSS the...

    Started by FloBGoode‎, 10-10-2014 03:41 AM
    • Replies: 0
    • Views: 1,066
    10-10-2014, 03:41 AM Go to last post
  40. How to solve this bayes statistics question? Anyone knows?

    I put it in the file, please download. All the formula and graphs are in the file.

    Started by solarboy‎, 10-09-2014 03:16 PM
    • Replies: 0
    • Views: 3,908
    10-09-2014, 03:16 PM Go to last post
  41. Anyone can help me solve this Bayes statistics peoblem?Thanks so much!

    1. Exchangeability with known model parameters: For each of the following three examples, answer: (i) Are observations y1 and y2 exchangeable? (ii)...

    Started by solarboy‎, 10-09-2014 03:09 PM
    • Replies: 0
    • Views: 1,557
    10-09-2014, 03:09 PM Go to last post
  42. Question What test to compare continuous, dependent variables?

    Hi I'm doing some scientific research and will be taking different samples (e.g. blood, urine, sputum) from the same subject that I want to...

    Started by HugoF‎, 10-09-2014 11:00 AM
    • Replies: 3
    • Views: 1,411
    10-09-2014, 11:39 AM Go to last post
  43. What hypothesis test?

    I have a population of Z items, where X must pass and Y must fail. The thing is that the X that pass is not just a count (i.e. if 2 must pass, it...

    Started by a4567258‎, 10-06-2014 10:50 AM
    bionomial distribution, hypothesis, sample size
    • Replies: 3
    • Views: 1,851
    10-09-2014, 08:14 AM Go to last post
  44. Sampling Broken into Multiple Groups: What's wrong with this?

    Hello. I have a question where i have to determine what is incorrect with the following sampling methodology to determine sample sizes. The problem...

    Started by Anotherdream‎, 10-09-2014 08:09 AM
    • Replies: 0
    • Views: 1,229
    10-09-2014, 08:09 AM Go to last post
  45. Comparing scores from two different tests

    The post "comparing scores from two different tests" has been deleted.

    Started by DCJR‎, 10-08-2014 09:08 PM
    • Replies: 0
    • Views: 1,419
    10-08-2014, 09:08 PM Go to last post
  46. Cumulative distribution function (cdf) - empirical vs theoretical ?

    Hello to all, I have a data-set with n = 90, probably follows the gamma distribution. I used the maximum-likelihood estimation (MLE) to estimated...

    Started by Pedrobele‎, 10-08-2014 06:42 PM
    cdf, empirical vs theoretical, gamma distribution
    • Replies: 3
    • Views: 1,979
    10-08-2014, 07:45 PM Go to last post
  47. Standard deviation of relative values

    Hi! I have 5 datasets each for 20 subjects which I have to plot relative to a baseline. To be more specific: Dataset 1: Contains mean value of...

    Started by Pinga‎, 10-08-2014 04:57 PM
    relative data, standard deviation
    • Replies: 0
    • Views: 1,403
    10-08-2014, 04:57 PM Go to last post
  48. Finding error for probabilistic image segmentation

    I have an image and I want to segment an object in it, but instead of creating a binary image, I calculate the probability of being in the object for...

    Started by rangraz‎, 10-08-2014 10:41 AM
    • Replies: 0
    • Views: 897
    10-08-2014, 10:41 AM Go to last post
  49. Cool Data analysis with a GEE, is my method valid?

    Hi everyone, I’ve been doing some statistical analyses in R on some data. It’s for use in a manuscript I’m hoping to get published in a biological...

    Started by Reese‎, 09-23-2014 02:14 AM
    gee, glm, glmm
    • Replies: 13
    • Views: 4,997
    10-07-2014, 10:01 PM Go to last post
  50. Correlation

    Hello, I had to miss my last class in stats and I don't know how to solve this question. 1. For each of the following combinations of values,...

    Started by rayblongma‎, 10-07-2014 04:47 PM
    correlation, correlation coefficient, homework, statistics, stats
    • Replies: 2
    • Views: 1,392
    10-07-2014, 09:55 PM Go to last post
  51. Testing for normality on correlated data (covariance matrix known).

    Hi all, I have an experimental data set of . Where (now) x_i's are the predictor variables (independent, no uncertainty) and the y_i's are the...

    Started by mity‎, 10-07-2014 12:55 PM
    data covariance matrix, multivariate normality
    • Replies: 4
    • Views: 1,525
    10-07-2014, 01:57 PM Go to last post
  52. Exponential Family-Example

    I have the following question. Does anybody know an example where the MLE is biased for an exponential family distribution, i.e. ...

    Started by A.C‎, 10-07-2014 09:39 AM
    biased, exponential family
    • Replies: 1
    • Views: 1,156
    10-07-2014, 10:55 AM Go to last post
  53. Question Which analysis? Impact of events on future behaviour - t test?

    Hi everyone, I'm still quite new to statistical analysis so I really would appreciate your input on how you would approach the following problem:...

    Started by Londoner‎, 10-07-2014 06:34 AM
    • Replies: 0
    • Views: 1,245
    10-07-2014, 06:34 AM Go to last post
  54. Significance of two-sample problem/test

    I am self-studying an applied statistics course (reading the curriculum, doing the recommended exercises, doing old projects etc.) and I am now...

    Started by jonascj‎, 10-02-2014 02:31 PM
    significance level, test, two sample, two-sample
    • Replies: 4
    • Views: 1,614
    10-07-2014, 05:20 AM Go to last post
  55. Stat Newbie: Quantifying Home Field Advantage Based on Attendance?

    Hi all! So, I noticed a pretty clear, statistical trend: college football teams perform better when their stadiums are full. But I realized...

    Started by aufvr‎, 10-06-2014 11:26 PM
    • Replies: 0
    • Views: 1,034
    10-06-2014, 11:26 PM Go to last post
  56. Exclamation Last week of Stats, need help!!!!!

    I have two papers due this week and they are both critical thinking prompts. I am having the worst trouble ever trying to figure out which...

    Started by cody1awesome‎, 10-06-2014 07:00 PM
    • Replies: 2
    • Views: 2,282
    10-06-2014, 07:07 PM Go to last post
  57. Normal and non-parametric repeated test data

    Hi All I have done some experimental work and collected data for the conductivity of water with various concentrations of salt. The experiment...

    Started by Dave556‎, 10-06-2014 01:13 PM
    non-parametric, normal distribution, repeated measurements
    • Replies: 0
    • Views: 1,577
    10-06-2014, 01:13 PM Go to last post
  58. I need help

    I need your help with my univerity project, I am testing awareness of insurance. (Yes/no) againt media internet,newspaper, tv, radios to see if...

    Started by em-don‎, 10-05-2014 09:46 PM
    • Replies: 9
    • Views: 2,529
    10-06-2014, 10:49 AM Go to last post
  59. Cool How to test for independence in a 2x5 contingency table

    I want to test for independence on awareness of insurance against means of getting information. Are you aware of insurance services (yes/No) How...

    Started by em-don‎, 10-05-2014 09:56 PM
    • Replies: 4
    • Views: 4,299
    10-06-2014, 07:21 AM Go to last post
  60. Question about Chi Square and Fisher Exact Tests

    Hi, I'm very much working in stats by necessity, so much of my knowledge is coming somewhat on the fly. I had a question about two non-parametric...

    Started by bschanding‎, 09-29-2014 11:00 AM
    chi square, fisher exact test
    • Replies: 1
    • Views: 2,025
    10-06-2014, 06:23 AM Go to last post

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