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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: 197,024
    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: 66,889
    09-30-2005, 09:44 AM Go to last post
  1. How many samples do I need for allele frequency analysis?

    Hi, I want to know a proportion of alleles in a population. If a genetic locus that I'm interested in is biallelic (i.e. two alleles: A & a),...

    Started by youngukoo‎, 03-13-2013 12:22 AM
    • Replies: 0
    • Views: 959
    03-13-2013, 12:22 AM Go to last post
  2. Help in Stata; Simulation

    Hello All, I am a beginners user in Stata and I am working on an assignment that requires me to run a simulation for a regression function. I...

    Started by statabeginner‎, 03-12-2013 04:26 PM
    • Replies: 0
    • Views: 1,495
    03-12-2013, 04:26 PM Go to last post
  3. Multiple comparison test, with ambiguous labels/ranks

    In a clinical study, I have patient's health condition labeled as grade 1, 2, or 3. Some patients are labeled as "Either 1 or 2" by the doctor,...

    Started by David.danju‎, 03-12-2013 10:32 AM
    kruskal wallis, multiple comparison test, p-value
    • Replies: 3
    • Views: 1,780
    03-12-2013, 03:07 PM Go to last post
  4. SPSS Stats help URGENT

    Hey guys, I am very sorry to bother you but I am wondering if you could help me with a Stats question for a project I am working on. It is bit...

    Started by bj1541‎, 03-12-2013 09:03 AM
    • Replies: 1
    • Views: 1,002
    03-12-2013, 10:55 AM Go to last post
  5. Statistics question

    Hi I am working on a project and would like people's opinions on the statistics, if possible? I am looking at a new processing and cutting...

    Started by TomJ‎, 03-12-2013 02:41 AM
    • Replies: 1
    • Views: 1,161
    03-12-2013, 07:55 AM Go to last post
  6. direction of association between nominal and ordinal variables

    Hello, I have a question about which test are appropriate to find direction of association between a nominal and an ordinal variable. I have...

    Started by jacky‎, 03-11-2013 02:22 PM
    association, direction, nominal, ordinal
    • Replies: 1
    • Views: 2,206
    03-11-2013, 04:19 PM Go to last post
  7. Time-Varying VCV Matrix


    Started by Praised‎, 03-11-2013 07:38 AM
    • Replies: 0
    • Views: 2,048
    03-11-2013, 07:38 AM Go to last post
  8. Statistical tests

    Hi. I need to compare two groups of data. And a person told me that I can apply a A, M or t test. A t test I know. But, what is a A or M test?...

    Started by slavia‎, 03-08-2013 09:47 AM
    • Replies: 7
    • Views: 1,567
    03-11-2013, 05:29 AM Go to last post
  9. Study Guide Help: Standard Deviation and Percentiles

    Hi all, I have a question that asks: Many test scores are (approximately) normally distributed. Your professor reports that the midterm average...

    Started by slickdap‎, 03-10-2013 05:56 PM
    • Replies: 3
    • Views: 2,730
    03-11-2013, 01:57 AM Go to last post
  10. Pearson and the assumption of normality

    Hello I read (here) that apparently Pearson's r does not require your variables to be normally distributed, only that the variables are...

    Started by Donald‎, 03-10-2013 08:44 PM
    • Replies: 0
    • Views: 1,492
    03-10-2013, 08:44 PM Go to last post
  11. Seasonal Time Series

    Suppose X_t = (\alpha + \beta{t})S_{t} + e_{t}. Define C_{12} = 1 - B^{12} as the backshift operator. Assume S_{t}=S_{t-1} for all i. Is C*X_{t}...

    Started by lord12‎, 03-10-2013 07:01 PM
    • Replies: 2
    • Views: 1,096
    03-10-2013, 08:17 PM Go to last post
  12. Finding constant c such that a quantitiy has a t-distribution

    Here is my question, and I am not exactly sure where to start: Question: Let X1, X2, ... , X5 be a random sample from of size n = 5 from N(0,...

    Started by siope1kd‎, 03-10-2013 07:38 PM
    • Replies: 0
    • Views: 1,845
    03-10-2013, 07:38 PM Go to last post
  13. Anderson-Darling - Test for Lognormality

    I am testing for Lognormality of the following data (R-Code): fish <- c(0.6,0.7,1.1,1.3,1.8,2.0,2.3,2.7,2.9,3.1, ...

    Started by simplemts‎, 03-10-2013 07:32 PM
    • Replies: 0
    • Views: 3,665
    03-10-2013, 07:32 PM Go to last post
  14. ANOVA - interpreting the results

    I'm simplifying my problem here, but assume I run a one-way ANOVA, and my independent factor has three levels, A, B and C. I run the ANOVA and find...

    Started by brukkaros‎, 03-08-2013 06:26 PM
    • Replies: 5
    • Views: 1,557
    03-10-2013, 02:29 PM Go to last post
  15. MLE for beta distribution

    I am working on a problem to find the MLE with respect to \theta for the following distribution X: X = \theta Z for some \theta > 0 with ...

    Started by GTaiko‎, 03-09-2013 09:10 PM
    • Replies: 3
    • Views: 4,592
    03-10-2013, 11:47 AM Go to last post
  16. Trying to evaluate/measure how much 1 variable affects another.

    Hello. So I've been helping look at some data for a fundraising event my school ran. We used an app and the school wants to evaluate if it is...

    Started by wizuriel‎, 03-10-2013 10:08 AM
    confidence intervals, correlation, nonparametric
    • Replies: 0
    • Views: 1,553
    03-10-2013, 10:08 AM Go to last post
  17. Point estimate help

    Hi there.... I am trying to work out the point estimate and confidence levels associated with it. Please see the info available and the actual...

    Started by defreitasdr‎, 03-10-2013 06:52 AM
    • Replies: 0
    • Views: 1,044
    03-10-2013, 06:52 AM Go to last post
  18. Do post-hoc tests take repeated measures into account?

    Hi, I've tried finding an answer to this question but can't find one anywhere :-/ If you perform a repeated measures design experiment (for...

    Started by hrj21‎, 03-03-2013 03:58 PM
    post-hoc, repeated measures
    • Replies: 1
    • Views: 1,309
    03-10-2013, 06:05 AM Go to last post
  19. Testing non-parametric data against an optimal value (Wilcoxon Signed Rank Test?)

    Hi everybody, I'm doing a master in Educational Science and had to do a questionnaire on student teachers' belliefs on interactional strategies. ...

    Started by Britta‎, 03-10-2013 05:02 AM
    • Replies: 0
    • Views: 1,011
    03-10-2013, 05:02 AM Go to last post
  20. Distributions

    I realise this is going to annoy some of you for its simplicity, but when I was "interviewed" I said I wanted to understand more about distributions....

    Started by bugman‎, 12-13-2012 02:54 AM
    • Replies: 13
    • Views: 2,471
    03-09-2013, 11:38 PM Go to last post
  21. Methods to find an optimum k in k-means clustering algorithm

    Hi all, What would be the most popular or most successful or most recent method to determine the number of clusters in the k-means algorithm? I...

    Started by khara‎, 03-09-2013 10:51 PM
    • Replies: 0
    • Views: 1,164
    03-09-2013, 10:51 PM Go to last post
  22. Question Correcting Sample Bias

    Hey everyone! Great forum, so glad i found it. :tup: Would appreciate if anyone could help with a problem i have with a report I'm writing on...

    Started by Probability‎, 03-09-2013 09:24 AM
    • Replies: 3
    • Views: 1,433
    03-09-2013, 09:46 PM Go to last post
  23. Lightbulb Analyzing the percent of time present in 5 areas

    I was trying to figure out the best way to analyze a divided area used by an animal and the percent of time this animal spent in each of the 5 areas....

    Started by parishgr‎, 03-09-2013 07:15 PM
    time percent area spatial
    • Replies: 0
    • Views: 1,268
    03-09-2013, 07:15 PM Go to last post
  24. interpreting standard deviation in decimal format...

    Hi all I'm working on a problem that says identify when the time series goes above or below 1.5 Standard deviations. The standard deviation is...

    Started by statarb‎, 03-09-2013 05:20 PM
    • Replies: 0
    • Views: 1,467
    03-09-2013, 05:20 PM Go to last post
  25. Max likelihood and bayesian stats in phylogenetic analysis

    Hi, I'm writing doing a phylogenetic analysis and I'm a bit stuck in writing a brief description of max likelihood and bayesian analysis. Could...

    Started by Cam‎, 03-07-2013 07:57 AM
    • Replies: 6
    • Views: 1,119
    03-09-2013, 02:47 PM Go to last post
  26. Probability and normal distributions

    Hello everyone. :wave:

    Started by Kabouterke‎, 03-09-2013 12:47 PM
    • Replies: 1
    • Views: 1,186
    03-09-2013, 12:53 PM Go to last post
  27. Novice: Help deciding which statistical method to use

    Hi, I am having some trouble deciding which statistical method to use for example data such as the one below. Basically, I want to see how...

    Started by draziert‎, 03-09-2013 07:05 AM
    • Replies: 2
    • Views: 1,452
    03-09-2013, 10:12 AM Go to last post
  28. AP Statistics Confidence interval-Please Help

    I am having trouble with this question The following data is the age at death (in days) for infants who died from sudden infant death syndrome...

    Started by serenamae1216‎, 03-08-2013 08:30 PM
    • Replies: 2
    • Views: 2,924
    03-08-2013, 09:15 PM Go to last post
  29. Optimus estimatorin

    Hi, I'm looking for the best estimator for estimate de number of corners a football team get in a match. At this moment I have a data sheet with...

    Started by Kikolo3000‎, 03-08-2013 07:30 PM
    • Replies: 0
    • Views: 1,304
    03-08-2013, 07:30 PM Go to last post
  30. Aggregating across data sets

    First, I just want to say that I am as green is it gets regarding statistics, but am hoping someone here can help me do a sanity check. Right now,...

    Started by diz420‎, 03-08-2013 02:53 PM
    • Replies: 0
    • Views: 995
    03-08-2013, 02:53 PM Go to last post
  31. Exponential Distribution Help Needed

    Hello all. I am having trouble with the exponential distribution in general, but specifically on the following problems: 4.2.2) Suppose that you are...

    Started by torchflame‎, 03-08-2013 12:54 PM
    • Replies: 2
    • Views: 2,831
    03-08-2013, 02:15 PM Go to last post
  32. need a push in the right direction.

    Hello all, I am new here and I thank you for reading this and possible suggestions, I would very appreciate it if someone could direct me in the...

    Started by Newcomer!‎, 03-08-2013 09:07 AM
    • Replies: 0
    • Views: 1,203
    03-08-2013, 09:07 AM Go to last post
  33. Expressing a time series in more detailed time interval using approximations

    Hello, I have a time series with a dependent variable (electricity comsumption) measured on a daily basis. I have also an independent variable...

    Started by zarasandreas‎, 03-08-2013 08:22 AM
    • Replies: 0
    • Views: 1,249
    03-08-2013, 08:22 AM Go to last post
  34. Help with basic probability word problem.


    Started by StilloftheNight‎, 03-08-2013 03:53 AM
    • Replies: 0
    • Views: 1,343
    03-08-2013, 03:53 AM Go to last post
  35. Correlation and Movements

    Hi there... I have a question pertaining to correlation and movements... lets say we have 2 variables X and Y. If X & Y are correlated to...

    Started by statarb‎, 03-07-2013 03:27 PM
    • Replies: 6
    • Views: 1,226
    03-07-2013, 05:49 PM Go to last post
  36. Testing means of means

    I received mean data for individuals and want know if I find the mean of the means and conduct a single sample ttest or nonparametric equivalent with...

    Started by hlsmith‎, 03-06-2013 08:40 PM
    • Replies: 5
    • Views: 1,234
    03-07-2013, 04:04 PM Go to last post
  37. Determining a particular test for this situation

    Hello, everyone! This is my first post here. First, let me say thanks to everyone active at this forum. It's really cool that you guys donate your...

    Started by pineapplejuice‎, 03-06-2013 03:16 PM
    • Replies: 1
    • Views: 1,291
    03-07-2013, 02:01 PM Go to last post
  38. Umvue

    Hi all, i'm quite stuck with the following problem: Let X₁.....Xn be i.i.d Bernoulli Random Variables with parameter p, i.e Pr = P. It is...

    Started by StandUp‎, 03-07-2013 12:13 PM
    • Replies: 1
    • Views: 1,951
    03-07-2013, 01:50 PM Go to last post
  39. Test the results from a Monte Carlo study

    Hello, I have conducted a Monte Carlo study with 200000 simulations of a value and I want now test if the mean of these simulated are equal to the...

    Started by schuch‎, 03-07-2013 10:46 AM
    • Replies: 1
    • Views: 1,759
    03-07-2013, 10:49 AM Go to last post
  40. Spearman vs Kendall, tied ranks

    I am running a non-parametric correlational analysis, and I am not sure about if I should use Spearman or Kendall. Kendall is recommened if there is...

    Started by tudelu1‎, 03-07-2013 07:15 AM
    kendall, spearman, tied ranks
    • Replies: 0
    • Views: 2,505
    03-07-2013, 07:15 AM Go to last post
  41. Factorization Theorem for Sufficient Statistic

    Hi, I am working through a problem using the Fisher–Neyman factorization theorem. Show that \prod_{i=1}^{n}X_i and \sum_{i=1}^{n}X_i are...

    Started by S-C-3-1-3‎, 03-07-2013 12:50 AM
    • Replies: 6
    • Views: 2,831
    03-07-2013, 01:21 AM Go to last post
  42. Playing Marco Polo with mutes.

    Hello, I am in the dismal position of having to teach myself statistics. It is not unlike playing Marco Polo with mutes. I am not trying to score...

    Started by Hopeless Lump‎, 03-06-2013 11:14 PM
    • Replies: 0
    • Views: 1,158
    03-06-2013, 11:14 PM Go to last post
  43. Fitting a zero-inflated normal

    Hi everyone, I have what (to me) seems like it should have a relatively simple solution but I'm struggling to find one. I'm fitting a pretty...

    Started by Ollie123‎, 03-06-2013 11:08 PM
    • Replies: 0
    • Views: 2,051
    03-06-2013, 11:08 PM Go to last post
  44. Don't Really Know where to start

    Suppose that a restaurant includes a free toy with every kid’s meal. There are five types of toys, and a kid wants to collect at least one of each...

    Started by slyguy‎, 03-06-2013 09:31 PM
    • Replies: 1
    • Views: 1,144
    03-06-2013, 10:14 PM Go to last post
  45. Needs tutoring with lisrel

    I am new to lisrel. And I am hoping to find a tutor for a couple of hours to teach me how to perform some analysis with the software. If you have the...

    Started by saralevy‎, 03-06-2013 05:14 PM
    • Replies: 0
    • Views: 1,377
    03-06-2013, 05:14 PM Go to last post
  46. Minimum to run Spearman's or Kendall

    Hi What is the minimum number of values to run Spearman's rank correlation coefficient and min to run Kendall tau rank correlation coefficient ?...

    Started by tnaser‎, 03-06-2013 09:18 AM
    • Replies: 4
    • Views: 1,603
    03-06-2013, 10:50 AM Go to last post
  47. Red face I need help with cross-country data and regression over a specific time period

    Hi all :wave: I have lagged data for 50 countries over years 1981-1988 and the data for dependent is from 1989-1997. The model contains GDP growth...

    Started by Macintosh‎, 10-27-2010 10:24 AM
    • Replies: 1
    • Views: 3,299
    03-06-2013, 10:32 AM Go to last post
  48. Z - Test

    Morning guys, I'm new to this forum, and was wondering if I could get some help trying to answer a question I've been working on for the last day,...

    Started by JoeRock‎, 03-05-2013 06:45 AM
    • Replies: 5
    • Views: 1,956
    03-06-2013, 10:03 AM Go to last post
  49. DOE for rock paper scissor analysis - suggestions for analysis needed!

    Hi, I am in a design of experiments class at my university. We are analyzing rock-paper-scissor strategies and results among females and males on...

    Started by domesplitter69‎, 03-05-2013 03:41 PM
    doe, hypothesis test
    • Replies: 8
    • Views: 1,695
    03-05-2013, 06:02 PM Go to last post
  50. Confused about different Z formulas

    Hello, I'm confused about the two different Z formulas: z = (X-bar - mu) / (std dev) and z = (X-bar - mu) / When do you use the sqrt of...

    Started by rawketman‎, 03-05-2013 04:04 PM
    • Replies: 4
    • Views: 1,322
    03-05-2013, 05:36 PM Go to last post
  51. help in two way anova

    hello! pls I need some help in my dissertation analysis, am using a two way anova method and I happens to have negative values in my f-ratio values,...

    Started by naanah_imam@yahoo.com‎, 03-05-2013 12:39 PM
    • Replies: 6
    • Views: 3,564
    03-05-2013, 05:05 PM Go to last post
  52. Calculating the Power of the test

    Hello, I'm very confused about my homework. I'm trying to calculate the power of the test and draw a power curve. Very confusing. I've got the...

    Started by rawketman‎, 03-05-2013 04:07 PM
    • Replies: 1
    • Views: 1,429
    03-05-2013, 04:12 PM Go to last post
  53. p-value cutoff for Wilcoxon rank sum test

    Hi all, I am using Wilcoxon rank sum test with continuity correction in order to determine if the differences in boxplot are significant. Does...

    Started by anagari‎, 03-05-2013 01:26 PM
    • Replies: 2
    • Views: 2,588
    03-05-2013, 03:10 PM Go to last post
  54. Question Calculate Confidence Interval of Parameters of a Fitted Distribution

    I have a data set obtained experimentally that I expect to be lognormally distributed (deviation from this distribution in the experimental data I...

    Started by manuelkuhs‎, 03-05-2013 10:28 AM
    • Replies: 5
    • Views: 2,186
    03-05-2013, 12:40 PM Go to last post
  55. Why does the grade distribution among students in a test is similar to a normal dist?

    It seems everything can be described as a normal distribution. The question is why. For instance, after each test, the distribution of grades in a...

    Started by schiavo1991‎, 02-28-2013 07:05 PM
    • Replies: 7
    • Views: 2,202
    03-05-2013, 12:00 PM Go to last post
  56. Mann–Whitney U tests around mean or median?

    Hello. So I helped run a fundraising event earlier this year that used an app, and we're now trying to measure if people the used the app...

    Started by wizuriel‎, 03-05-2013 09:40 AM
    • Replies: 4
    • Views: 35,000
    03-05-2013, 11:46 AM Go to last post
  57. Before and after comparison using ANOVA

    I have 3 groups of people (A, B, C). I measure the baseline (BLBP) blood pressure for all 3 groups. I put each group on a different diet for 6...

    Started by nigellscott‎, 03-05-2013 10:57 AM
    • Replies: 0
    • Views: 2,302
    03-05-2013, 10:57 AM Go to last post
  58. Survival Analysis SPSS: Repeated Events

    Dear TalkStats Forum, Does anyone have experience using SPSS for survival analysis when there are repeated events? the good news is, I'm...

    Started by rclukey‎, 09-13-2012 12:05 PM
    repeated events, spss, survival analysis
    • Replies: 2
    • Views: 2,414
    03-04-2013, 07:58 PM Go to last post
  59. Hazard Function

    Q: Given the following Hazard Function: 2t^2, what is P. I recently had this on an exam and know that the Hazard Function is the PDF/Survival...

    Started by simplemts‎, 03-03-2013 06:40 PM
    • Replies: 4
    • Views: 1,857
    03-04-2013, 01:58 PM Go to last post
  60. MANOVA question regarding writing up main effects

    My professor had us run main effects of MANOVA in two different orders in order for us to understand the impact of ordering variables. In this...

    Started by ALT803‎, 03-04-2013 10:24 AM
    • Replies: 2
    • Views: 1,738
    03-04-2013, 01:23 PM Go to last post

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