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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: 196,561
    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: 66,620
    09-30-2005, 09:44 AM Go to last post
  1. Correlation for regression- help needed please

    Hi everyone, Firstly, let me apologise for how rubbish I am at stats! I need to do a multiple regression and I've been told I need to do...

    Started by Sheffield1‎, 04-18-2013 04:36 PM
    • Replies: 0
    • Views: 1,136
    04-18-2013, 04:36 PM Go to last post
  2. Linear Regression in SPSS

    Hi, i am currerntly working on my stat assignment with SPSS. I have to make the table and then to explain the table. I was able to make the tables...

    Started by shdydwjd‎, 04-18-2013 04:36 PM
    • Replies: 0
    • Views: 1,394
    04-18-2013, 04:36 PM Go to last post
  3. degrees of freedom R t-test

    I've carried out this t-test with toy data in R: set.seed(45) x <- sample(10:100, 20) set.seed(45) y <- sample(50:150, 20) t.test(x, y)

    Started by Layo909‎, 04-18-2013 02:18 PM
    • Replies: 3
    • Views: 5,512
    04-18-2013, 02:57 PM Go to last post
  4. confidence intervals in R

    I've drawn 100 samples of size 25 from the mpg variable in mtcars and calculated 95% confidence intervals for the means of each of these samples. ...

    Started by Layo909‎, 04-18-2013 02:46 PM
    • Replies: 1
    • Views: 1,587
    04-18-2013, 02:56 PM Go to last post
  5. Missing Data

    I am very new to statistics but I am looking for some common practice regarding this subject. I have entities which have an arrival time, but in...

    Started by hardy99‎, 04-17-2013 08:11 AM
    2 Pages
    1 2
    • Replies: 15
    • Views: 3,128
    04-18-2013, 11:36 AM Go to last post
  6. Quantify mediation effect of one variable on interaction of 3 others

    I would like some quantitative measure of the degree to which an observed categorical variable predicts mediates the effect of an experimentally...

    Started by baixiwei‎, 04-18-2013 09:07 AM
    • Replies: 0
    • Views: 1,165
    04-18-2013, 09:07 AM Go to last post
  7. tests of normality

    Hi. How can I test normality of data? Which is the best tests?

    Started by slavia‎, 04-16-2013 06:25 AM
    2 Pages
    1 2
    • Replies: 23
    • Views: 4,561
    04-18-2013, 02:40 AM Go to last post
  8. Regression Question

    Hey guys, stuck on a homework question, help please! Country/per capita expenditure/% of Health costs paid by private insurance Japan/2662/0.4...

    Started by HopeLessStats‎, 04-16-2013 01:03 PM
    • Replies: 11
    • Views: 1,731
    04-18-2013, 01:18 AM Go to last post
  9. AR(1) model help

    AR1 model how to do it,

    Started by tradealerts55‎, 04-17-2013 07:34 PM
    ar(1) model help, stats
    • Replies: 0
    • Views: 1,254
    04-17-2013, 07:34 PM Go to last post
  10. Some Help Please

    This is mostly on the Hypothesis TEsts for a Mean Population= Population STD is Known. I know the formula just fine, but this deals more with the...

    Started by PSG‎, 04-17-2013 03:46 PM
    • Replies: 1
    • Views: 1,168
    04-17-2013, 07:29 PM Go to last post
  11. Hypotheses Testing in Amos (reading output). Help

    I have conducted a CFA for my theoretical model assessment using SPSS AMOS. I am at the stage where I need to confirm/reject hypotheses addressed by...

    Started by deto4ka‎, 04-17-2013 02:22 PM
    • Replies: 0
    • Views: 3,121
    04-17-2013, 02:22 PM Go to last post
  12. Fair value model

    Hi all, I am trying to build a fair value model for a currency pair. The idea is to look at a pair - for example the Euro against the Czech Korona...

    Started by randomrun‎, 04-17-2013 10:18 AM
    • Replies: 0
    • Views: 1,273
    04-17-2013, 10:18 AM Go to last post
  13. (nested) mixed model in SPSS

    Hi My question concerns both data structure (and subsequent the exact analysis model to use) and the implementation in the statistical software...

    Started by m.v‎, 04-17-2013 08:45 AM
    • Replies: 0
    • Views: 3,358
    04-17-2013, 08:45 AM Go to last post
  14. Results Interpretation

    Hi, Been a while since I've had to do statistics, would appreciate any help! Basically I've completed the SPSS tests (Oneway ANOVA), but now have...

    Started by PaulScolesScoresGoals‎, 04-12-2013 06:28 AM
    • Replies: 2
    • Views: 1,542
    04-17-2013, 04:37 AM Go to last post
  15. Bayes' Parameter Estimate

    Hello everyone, For this problem, I calculated the Bayes' estimate of the parameter, p , both by recognizing it and by calculating it using the...

    Started by S-C-3-1-3‎, 04-16-2013 08:56 PM
    • Replies: 3
    • Views: 1,059
    04-16-2013, 10:22 PM Go to last post
  16. Which test should I run in SPSS for my data

    Hi there, I would be very appreciative of anyone that can help me with my dilemma. I am currently a grad student that just finished running data for...

    Started by sarbear101‎, 04-16-2013 07:24 PM
    • Replies: 0
    • Views: 1,077
    04-16-2013, 07:24 PM Go to last post
  17. Is given data sample or population

    What is the logic in determining whether a given data is sample or population. E.g. I have a bunch of stock returns from 2009 to 2011. There is no...

    Started by sak‎, 04-16-2013 04:49 PM
    • Replies: 2
    • Views: 1,344
    04-16-2013, 06:48 PM Go to last post
  18. maximum likelihood

    Hello! I would like to know if what I need to do is feasible. Given a sample x=, I would like to know the probability (the likelihood) that the...

    Started by bizan‎, 04-16-2013 05:11 PM
    likelihood
    • Replies: 7
    • Views: 1,869
    04-16-2013, 06:13 PM Go to last post
  19. Using regression to find "balance" (Making a video game. :))

    Hello everyone. I'll try to be brief. The first paragraph or so may be irrelevant to answer the question, but I'm including it for context. For...

    Started by McGuirk‎, 04-10-2013 09:20 PM
    • Replies: 11
    • Views: 2,205
    04-16-2013, 12:49 PM Go to last post
  20. Standard Deviation Help

    ABC Airlines' planes hold 100 passengers. They book 120 passengers. 20% of the people that they book do not show up. What is the percentage that on...

    Started by samw1ch‎, 04-16-2013 11:37 AM
    • Replies: 4
    • Views: 1,577
    04-16-2013, 12:00 PM Go to last post
  21. Finding Confidence level if given confidence interval?

    Here is the problem... Suppose a random sample of size 81 from a normal population with known standard deviation = 40 produced (60,80) as a...

    Started by 4tunate1‎, 04-15-2013 05:55 PM
    • Replies: 2
    • Views: 1,896
    04-16-2013, 11:11 AM Go to last post
  22. SPSS - Independent t-test (Desperate for help!)

    I am currently trying to complete my results section for my dissertation, I am looking at gender differences in attitudes towards domestic abuse. I...

    Started by Becca91‎, 04-16-2013 06:23 AM
    • Replies: 3
    • Views: 1,493
    04-16-2013, 08:11 AM Go to last post
  23. Trouble with Confidence Intervals

    Hey all, I feel like this is a very basic question, but I want to make sure I get it right. Here is my problem: I need to get a confidence...

    Started by phalse‎, 04-15-2013 05:24 PM
    • Replies: 1
    • Views: 1,209
    04-16-2013, 07:08 AM Go to last post
  24. Combining expected values and variances

    Hi! First post here so cut me a bit of slack :) Hopefully an easy topic too (I'm new to stats). If I have some values for E(X) (e.g. 5min) and...

    Started by slowrolla‎, 04-16-2013 07:04 AM
    expected value, uniform distribution, variance
    • Replies: 0
    • Views: 2,694
    04-16-2013, 07:04 AM Go to last post
  25. Comparison of data distribution/normality in multiple groups

    I would appreciate some assistance with data distribution. I am looking at a pre-intervention measure (discrete continuous) from a large...

    Started by statdoc‎, 04-16-2013 06:37 AM
    • Replies: 0
    • Views: 1,217
    04-16-2013, 06:37 AM Go to last post
  26. Question X and Y related, can I assign Probability distribution of X to Y ??

    I have a very important question I need to solve for my PhD research. Please look carefully at the attached image. Lets assume we have a...

    Started by Harry_Johnson‎, 04-16-2013 05:42 AM
    • Replies: 0
    • Views: 1,278
    04-16-2013, 05:42 AM Go to last post
  27. Bonferroni Test for 2 Models in Prism

    Hi, I have 3 diabetic animal groups; and 3 non-diabetic groups. If I want to run Bonferroni Test, for selected pairs for these 2 models (diabetic...

    Started by Salah‎, 04-16-2013 05:32 AM
    • Replies: 0
    • Views: 1,359
    04-16-2013, 05:32 AM Go to last post
  28. hiya can any one please help with my statistics its getting me down

    i have to do some stats for my project at uni and im struggling and stressing smooth newts and great crested newts at 8 ponds data sets of...

    Started by robign‎, 04-15-2013 03:07 PM
    • Replies: 3
    • Views: 1,547
    04-15-2013, 04:20 PM Go to last post
  29. Expectation of function of a random variable

    Hi guys, I hope everyone's been doing well. Sorry I haven't been around lately. School's just kicking my butt bad. I'm hoping that someone can...

    Started by Link‎, 04-13-2013 09:22 PM
    • Replies: 3
    • Views: 1,341
    04-15-2013, 03:31 PM Go to last post
  30. Standard Deviation

    A gambler has rolled five fair dice 40 times and computed the average score each time. Here are the 40 average scores the gambler computed: 4.6,...

    Started by smsmth10‎, 04-14-2013 04:09 PM
    • Replies: 3
    • Views: 2,007
    04-15-2013, 01:50 PM Go to last post
  31. auto correlation plot- tool

    Hi all, Does any one know any tool or any sample in excel for partial autocorrelation plot. here is the sample of partial autocorrelation...

    Started by miaw650‎, 04-15-2013 01:24 PM
    • Replies: 0
    • Views: 1,430
    04-15-2013, 01:24 PM Go to last post
  32. Multiple Regression: Standard Error of estimate

    Hello everyone, I'm a student and I was looking through some statistics questions and I found something strange that I couldn't explain at all. ...

    Started by rvc‎, 04-14-2013 12:15 PM
    • Replies: 3
    • Views: 2,340
    04-15-2013, 12:29 PM Go to last post
  33. Unequal sample sizes?

    Hi, what do you have to consider when using unequal sample sizes? How does it differ from using equal sizes? As an example, I have Group 1:...

    Started by dannee_‎, 04-14-2013 03:59 AM
    • Replies: 9
    • Views: 4,828
    04-15-2013, 10:38 AM Go to last post
  34. Statistics Coursework Bayes

    We have been given this coursework and told that its harder than any exam question we will ever get. I have no clue on how to do this? I'm guessing i...

    Started by stat101‎, 03-31-2013 01:03 PM
    • Replies: 5
    • Views: 1,996
    04-15-2013, 08:48 AM Go to last post
  35. Help with ANOVAS

    1234567891

    Started by arlucero1‎, 04-15-2013 12:36 AM
    • Replies: 1
    • Views: 1,421
    04-15-2013, 07:21 AM Go to last post
  36. Uniformly Most Powerful Test

    Hello, Let X be a single observation from f(x)=\frac{\theta}{2^{\theta}}x^{\theta-1},\ \text{for}\ 0\leq x\leq 2 Find the most powerful...

    Started by S-C-3-1-3‎, 04-14-2013 10:34 PM
    • Replies: 3
    • Views: 1,349
    04-15-2013, 05:01 AM Go to last post
  37. size sample required to construct a 95% C.I. with margin of error

    N = 8 Mean = 2.10 stDev = 0.537 What size sample is required to construct a 95% confidence interval with a margin of error of 0.3? try n = 12,...

    Started by goodz‎, 04-14-2013 11:04 PM
    • Replies: 0
    • Views: 605
    04-14-2013, 11:04 PM Go to last post
  38. Unsure on how to plot data..

    We are doing an experiment in our lab, and it's fairly simple: we take five randomly selected rubberbands, and shoot each of them the same five...

    Started by hadlerstate‎, 04-14-2013 07:42 PM
    • Replies: 0
    • Views: 1,016
    04-14-2013, 07:42 PM Go to last post
  39. On covariance of ordinary differential equations and their arguments

    Hi, Consider the time-varying, ordinary differential equation : \dot x = f(x,t) (1.) Next, suppose the observed...

    Started by Phillip@ITK‎, 04-14-2013 09:00 AM
    • Replies: 0
    • Views: 1,268
    04-14-2013, 09:00 AM Go to last post
  40. Can i do a t-test after Tukey post hoc?

    Hello just wondering if this is acceptable or whether it's just gonna cause a type-1 error. I have used One-way ANOVA and then Tukey post hoc to...

    Started by Alice1436‎, 04-13-2013 05:59 AM
    • Replies: 8
    • Views: 2,803
    04-14-2013, 06:33 AM Go to last post
  41. Question A binomial toughie

    Hi guys, could someone people help me with this hard problem? I read fundamentals of biostatistics by posner (revelant sections), did some google...

    Started by statdude0‎, 04-14-2013 02:12 AM
    • Replies: 0
    • Views: 976
    04-14-2013, 02:12 AM Go to last post
  42. Assuming Equal Variances- what to do?

    Hello, On my data I have assessed whether it's parametric. The distribution is normal, however on the Levene Statistic test, it has a significance...

    Started by 03turnerS‎, 04-13-2013 05:54 PM
    • Replies: 1
    • Views: 2,361
    04-13-2013, 06:07 PM Go to last post
  43. Levene test significant in GLM mltivariate

    Hi everyone! I have found statistical significance for one variable in a General Linear Model multivariate test. For this variable the Levene test...

    Started by Kassandra‎, 04-13-2013 12:01 PM
    • Replies: 0
    • Views: 1,776
    04-13-2013, 12:01 PM Go to last post
  44. One Sample Wilcoxon Signed Rank Test

    I have two measures from the same large sample of people (N>1,000). I want to test the hypothesis that one of the measures will be greater than the...

    Started by Benincasa‎, 04-13-2013 06:21 AM
    • Replies: 1
    • Views: 3,030
    04-13-2013, 09:19 AM Go to last post
  45. HLM simple slope analysis

    Would you please let me know if I need simple slope analysis for this HLM output? Thanks~ Final estimation of fixed effects ...

    Started by florida‎, 04-12-2013 06:22 PM
    • Replies: 0
    • Views: 2,508
    04-12-2013, 06:22 PM Go to last post
  46. Is Gross profit and budget (in US millions of dollars) discrete or continuous?

    Please help I'm so confused atm I've done a bivariate analysis on the relationship between the Budget and Gross Profit of movies NOTE: some of the...

    Started by b2g‎, 04-12-2013 05:57 PM
    • Replies: 0
    • Views: 3,356
    04-12-2013, 05:57 PM Go to last post
  47. Disseration non normal data help

    Hi I am struggling to work out how to interpret my dissertation data and not sure what tests/how to perform the tests on SPSS. My study looked at...

    Started by sammo‎, 04-12-2013 03:14 PM
    • Replies: 3
    • Views: 1,680
    04-12-2013, 04:53 PM Go to last post
  48. Indirect Moderation: Is it possible? Has it been done? Am I taking crazy pills?

    Greetings! I'm trying to work out a method for testing the moderating effects that might be carried (mediated?) by an additional moderating...

    Started by pdg209‎, 04-11-2013 10:55 PM
    indirect moderation, mediated moderation
    • Replies: 3
    • Views: 1,102
    04-12-2013, 08:58 AM Go to last post
  49. help for final dissertation in finance- very easy stat - URGENT! :-)

    Hi I am about finishing my thesis in finance but I don't remember anything about statistics and I need your help!! here is my issue: the topic...

    Started by gloria88it‎, 04-12-2013 02:57 AM
    dissertation, inference, probabilities, sample population, validity testing
    • Replies: 2
    • Views: 1,032
    04-12-2013, 07:43 AM Go to last post
  50. Brief question about chi-square test for trend

    Hey folks, I have three different time points (1y, 2y and 3y) and I'm going to see whether certain proportion changes over time. The proportions...

    Started by Jka‎, 04-12-2013 07:27 AM
    • Replies: 0
    • Views: 2,109
    04-12-2013, 07:27 AM Go to last post
  51. Comparing two sets of Likert-scale data

    I have used a questionnaire which contain 5 point Likert-scale questions. What statistical test can I use to find out if there is a difference...

    Started by Fong‎, 04-12-2013 03:03 AM
    likert scale
    • Replies: 1
    • Views: 3,459
    04-12-2013, 03:41 AM Go to last post
  52. sample size formula

    Hi, I have a sample size calculator problem: I have to draw a random sample of Toyota car owners from a city; I know the size of the population...

    Started by svs‎, 04-11-2013 11:49 PM
    sample size, sampling frame
    • Replies: 0
    • Views: 1,269
    04-11-2013, 11:49 PM Go to last post
  53. Statistical technique to compare more than one groups with given constant values

    Hi! I have three samples (S1, S2, S3) to test for nitrogen content and three methods of analysis (M1, M2, M3). I am trying to find out the most...

    Started by gdhillon‎, 04-11-2013 06:16 PM
    compare groups, t-test
    • Replies: 1
    • Views: 1,313
    04-11-2013, 11:14 PM Go to last post
  54. Unusual data points help

    Hi there. I'm a student doing a i'm doing a bivariate analysis of the relationship between budget (explanatory variable) and gross profit (response...

    Started by b2g‎, 04-11-2013 08:56 PM
    • Replies: 0
    • Views: 991
    04-11-2013, 08:56 PM Go to last post
  55. Standard Deviation of X Bar?

    The population standard deviation= 1.7078 n=40 What is the standard deviation of x bar? Help! I keep using the formula: standard deviation of...

    Started by smsmth10‎, 04-11-2013 04:32 PM
    • Replies: 8
    • Views: 5,320
    04-11-2013, 08:19 PM Go to last post
  56. calculate array similarity

    hello everybody, I don't know if my question is in topic for this forum...I would like to compare two arrays of numbers, where not only the single...

    Started by atma_weapon‎, 04-11-2013 02:03 PM
    • Replies: 3
    • Views: 1,954
    04-11-2013, 05:48 PM Go to last post
  57. tests of equivalence help

    Hi all I'm looking for some advice on the following equivalence question-- I've been trying to think it through systematically but I'm confused! ...

    Started by marika‎, 02-08-2013 01:45 PM
    • Replies: 1
    • Views: 1,167
    04-11-2013, 01:42 PM Go to last post
  58. Multinomial regression?

    Hi all, I need an advice on how proceed with my data analysis. I have 4 groups of treatment (included the control and three concentrations of a...

    Started by microvi‎, 04-11-2013 01:20 PM
    • Replies: 0
    • Views: 1,076
    04-11-2013, 01:20 PM Go to last post
  59. Are there residual plots for Poisson Regression?

    Does one assess the normality of residuals via residual plots?

    Started by lord12‎, 04-11-2013 12:42 PM
    • Replies: 2
    • Views: 1,674
    04-11-2013, 12:46 PM Go to last post
  60. Statistical test for pre-post multiple choice questions

    Hi! So I have a pre-test, a lecture, and then a post test. The data is paired. I have 3 different question types: Multiple-choice (where...

    Started by the funk‎, 08-15-2012 06:09 PM
    • Replies: 3
    • Views: 2,289
    04-11-2013, 11:53 AM Go to last post

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