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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: 197,214
    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: 66,988
    09-30-2005, 09:44 AM Go to last post
  1. OC Curve Program

    One of my friends has asked me to help him write a program to calculate the "n" and "c" values (sampling size, accept number), only given...

    Started by statsman2013‎, 05-06-2013 07:44 PM
    accept number, oc curve, programming, sampling, statisics
    • Replies: 0
    • Views: 1,799
    05-06-2013, 07:44 PM Go to last post
  2. A bit basic but....Help!

    Honestly this problem put me into a stump. I'm used t having set of data values, but now I'm just confused on this. I am just starting statistics so...

    Started by exkingb12‎, 05-06-2013 06:10 PM
    • Replies: 1
    • Views: 3,281
    05-06-2013, 06:48 PM Go to last post
  3. Calculating Probability from Mean and standard deviation

    Hello, im having difficulty in solving the following problem, Could anyone please solve this. Lifts usually have signs indicating their maximum...

    Started by ranish293‎, 05-02-2013 09:56 PM
    • Replies: 2
    • Views: 2,850
    05-06-2013, 01:32 PM Go to last post
  4. coefficient of variation

    I would like to check the reliability of my test retest study. Different raters measured height and weight twice (visits 1 week apart) on 5...

    Started by tascja‎, 05-02-2013 10:39 AM
    • Replies: 1
    • Views: 1,528
    05-06-2013, 11:58 AM Go to last post
  5. Repeated Measures ANCOVA - questions on covariates and output

    Hello everybody, I need some help with a RM ANOVA or ANCOVA. I have to help an intern at my department with her analyses but don't the answers...

    Started by Sabine‎, 05-06-2013 10:46 AM
    • Replies: 0
    • Views: 1,544
    05-06-2013, 10:46 AM Go to last post
  6. 2 x 2 data, statistical test

    Hi, This is a simple question, but what is the appropriate statistical test for the following situation. ...

    Started by lgangs‎, 04-04-2013 09:28 PM
    • Replies: 3
    • Views: 1,815
    05-06-2013, 06:28 AM Go to last post
  7. Estimation and Hypothesis Testing

    Hey, I'm new here, hope this is the right spot for this. I was very good at understanding this information when we moved in sections because I knew...

    Started by RichAshford21‎, 05-05-2013 05:16 PM
    • Replies: 1
    • Views: 1,161
    05-05-2013, 05:17 PM Go to last post
  8. Fractional Factorial Experiment Design

    I know that to get the alias rows with the main factor effects, I use mod 2 multiplication with the main effects and the elements of the defining...

    Started by APOCooter‎, 05-05-2013 01:06 PM
    • Replies: 0
    • Views: 894
    05-05-2013, 01:06 PM Go to last post
  9. standardised indirect effects in multimediational analysis

    Hi I have been using Andrew Hayes PROCESS to calculate indirect effects in a multimediational model. Is there a way to calculate standardized or...

    Started by rosenmarsh‎, 05-05-2013 07:17 AM
    • Replies: 0
    • Views: 1,794
    05-05-2013, 07:17 AM Go to last post
  10. Two different populations?

    I posted a while ago about a project that I had to do and I think I got it but I have a question. I'm doing it on graduation rates in America...

    Started by Samuraiedge‎, 05-04-2013 10:34 AM
    • Replies: 1
    • Views: 1,544
    05-05-2013, 01:56 AM Go to last post
  11. T-test

    I'm carrying out a t-test 'by hand' in R. H0: mean = 0, H1: mean != 0. Sample is 9, 10, 11, 10, 10. Sample mean is 10, with standard...

    Started by Layo909‎, 05-04-2013 03:46 AM
    • Replies: 11
    • Views: 2,120
    05-04-2013, 09:19 PM Go to last post
  12. Split testing emails. Trying to build a calculator in PHP but don't remember stats

    Yea, I got a perfect score on AP statistics but I am totally defeated by this problem which is probably quite simple. I'm testing two emails with...

    Started by trevorhughdavis‎, 05-04-2013 05:18 PM
    • Replies: 1
    • Views: 1,800
    05-04-2013, 05:58 PM Go to last post
  13. Mann-Whitney test

    Hi there, I am a total beginner with SPSS and I really need your advice, because I am carrying out my research. Is it possible to use Mann-Whitney...

    Started by Lina_‎, 05-04-2013 12:03 PM
    mann-whitney test, mann-whitney u
    • Replies: 0
    • Views: 890
    05-04-2013, 12:03 PM Go to last post
  14. Need Help With Calculation-(Inference About Two Means:Independent Samples)

    Sample n1=14 n2=14 Size Same Mean x1(mean symbol)=7.881, x2=8.430 STD, s1=S1=1.017 s2=1.005 I am wondering where in my TI-84 SE I...

    Started by PSG‎, 05-03-2013 06:31 PM
    • Replies: 1
    • Views: 1,316
    05-03-2013, 06:48 PM Go to last post
  15. Correlation or Crosstabs?

    Hi all, I'm working on a homework assignment, one of the questions asks: Look at the differences in household size, household income, ever...

    Started by LeahNicole‎, 05-03-2013 03:50 PM
    • Replies: 2
    • Views: 2,779
    05-03-2013, 05:26 PM Go to last post
  16. Unhappy can't detect outliers

    Hello, everyone, I am doing an assignment where i need to check the data on the statistical assumptions, I need to comment on the presence of...

    Started by invisibleme‎, 05-03-2013 07:57 AM
    • Replies: 7
    • Views: 2,166
    05-03-2013, 12:17 PM Go to last post
  17. Best way to analyse my data: 2-way repeated measures anova?

    :wave::wave: Hi TalkStats :wave::wave: I have a data set which is outlined in the table below: \begin{tabular}{|l|cr|} \hline ID & baseline...

    Started by lb5962‎, 05-03-2013 04:52 AM
    2-way anova, repeated measures, weighted means
    • Replies: 1
    • Views: 2,985
    05-03-2013, 05:01 AM Go to last post
  18. Logistic Regression - How to interpret a Exp(b)= 0

    Hi all, I'm working on a project and keep getting caught up with how to interpret my results. I've found lots of info on how to interpret...

    Started by jessireebob‎, 05-01-2013 12:16 PM
    3 Pages
    1 2 3
    • Replies: 32
    • Views: 26,169
    05-03-2013, 04:45 AM Go to last post
  19. Question what test to use instead of t test if the variable is not normally distributed???

    Hi guys! I must compare one variable in 2 polupations.... which test should I do to check the normal distribution of the dependent variable...

    Started by giovanni83‎, 05-02-2013 06:26 AM
    • Replies: 1
    • Views: 2,256
    05-02-2013, 07:51 PM Go to last post
  20. série temporelle

    Bonjour, Dans le cadre de ma formation je dois réaliser une étude statistique à partir d'une base de données (sur n'importe quel sujet) Je suis...

    Started by reema‎, 05-02-2013 06:59 AM
    • Replies: 1
    • Views: 25,245
    05-02-2013, 04:04 PM Go to last post
  21. How can I find tendencies in specific cases between two groups?

    So, I'm doing this project where we are investigating whether social networks can influence peoples distinctiveness. Briefly summarized, we have...

    Started by MEGAMASTER4000‎, 05-02-2013 08:14 AM
    distinctiveness, spss, t-test, tendencies
    • Replies: 0
    • Views: 836
    05-02-2013, 08:14 AM Go to last post
  22. How do you derive autocorrelation for MA(1)

    How do you show that \phi_{22} = \frac{-\theta^{2}}{1+\theta^{2} +\theta^{4}} given X_{t} = w_{t} - \theta w_{t-1}. I know that \phi_{11} =...

    Started by lord12‎, 05-02-2013 05:43 AM
    • Replies: 1
    • Views: 1,192
    05-02-2013, 08:07 AM Go to last post
  23. T-Test or Two-Way Repeated Measures ANOVA for significance?

    My study consisted of faces being either flickered or static, and showing either anger or a neutral expression. I was wondering when finding...

    Started by JoelGertner‎, 05-02-2013 07:33 AM
    • Replies: 0
    • Views: 1,050
    05-02-2013, 07:33 AM Go to last post
  24. Levene's test significant in two-way ANOVA

    Hi everyone, I'll try and state my problem as clearly as possible and hope that someone will be kind enough to help: I want to run a two-way...

    Started by benjwalt‎, 04-30-2013 12:27 PM
    • Replies: 4
    • Views: 5,579
    05-02-2013, 06:51 AM Go to last post
  25. When is the distribution abnormal, judging from the mean, median and modus?

    I have a poll data table with which be filled with between two and six thousand entries (one entry contains some 30 data). It is a table in SQL, a...

    Started by FrankC‎, 04-29-2013 12:52 PM
    • Replies: 9
    • Views: 2,486
    05-02-2013, 05:30 AM Go to last post
  26. change of cale, rank correlation SPEARMAN

    Hello everybody, I have computed a coeffecient correlation of SPEARMAN for 2 columns number; as you know, the result is between -1 and 1. My...

    Started by anass‎, 05-02-2013 03:05 AM
    • Replies: 0
    • Views: 1,012
    05-02-2013, 03:05 AM Go to last post
  27. Equal Variances for ANOVA

    Hello, In order to use ANOVA, the variances all need to be equal. The following are the variances I have for three samples: 1. Variance: 1.73...

    Started by S-C-3-1-3‎, 05-01-2013 11:51 PM
    • Replies: 3
    • Views: 1,349
    05-02-2013, 02:51 AM Go to last post
  28. Quantitative Statistics Help

    Hey guys, so I have a stats project I have to do and I don't really know what topic to choose that would actually work. Here's the prompt ...

    Started by Samuraiedge‎, 05-01-2013 09:56 PM
    • Replies: 2
    • Views: 1,558
    05-01-2013, 11:35 PM Go to last post
  29. Drink A or B? Basic stats help.

    What method do I use to solve this statistics problem? I have a sample of n=100 units(males and females)...50 male and 50 female. Each unit rated 2...

    Started by StilloftheNight‎, 05-01-2013 11:16 PM
    • Replies: 1
    • Views: 1,420
    05-01-2013, 11:32 PM Go to last post
  30. One Sample Hypothesis Test, did I use the correct formula for the p-value on excel?

    :confused: would really appreciate help. I am pretty sure the first tab---the one sample hypothesis test would be a right tailed test, but I am not...

    Started by aahmed03‎, 05-01-2013 08:17 PM
    • Replies: 0
    • Views: 1,160
    05-01-2013, 08:17 PM Go to last post
  31. Dice Questions

    Hi (this may belong to Probability but not sure), I want to know how many games do I have to play in order to get a 10 win streak? The game deals...

    Started by babykagomegirl‎, 04-30-2013 10:58 PM
    • Replies: 2
    • Views: 1,389
    05-01-2013, 02:31 PM Go to last post
  32. Getting individual results from overall results - Help plz

    Hi people, I would like to ask for your help because I ran a psychophysical experiment with 15 persons but unfortunately I've collected in a wrong...

    Started by emekapa‎, 05-01-2013 09:28 AM
    • Replies: 0
    • Views: 978
    05-01-2013, 09:28 AM Go to last post
  33. Comparing 2 sets of counts

    Hi, I would like to compare 2 sets of counts. The data follow-ish a Poisson distribution and there are a lot of ties (lots of 0 especially). Would a...

    Started by mousme‎, 05-01-2013 08:51 AM
    • Replies: 0
    • Views: 1,348
    05-01-2013, 08:51 AM Go to last post
  34. Scheffe procedure for two-factor ANOVA

    Hi- It's been a while since I've studied two-factor ANOVAs, and I'm afraid I'm a bit rusty. I have done a two-factor ANOVA, with the following...

    Started by nipper‎, 05-01-2013 07:31 AM
    • Replies: 0
    • Views: 1,322
    05-01-2013, 07:31 AM Go to last post
  35. SPSS Project

    Need help deciding what test to run in SPSS. My question was this: "A school psychologist is interested in understanding some variables possibly...

    Started by Houston810‎, 05-01-2013 07:19 AM
    • Replies: 0
    • Views: 1,147
    05-01-2013, 07:19 AM Go to last post
  36. Smile statistics help needed! Any ideas with regards to answering these questions?

    Question Three Plastic bottles containing a cleaning solution are packed in cartons of a dozen bottles. Let the random variable X be the number of...

    Started by rocky5685‎, 04-30-2013 05:33 AM
    • Replies: 3
    • Views: 2,125
    05-01-2013, 05:11 AM Go to last post
  37. Proportion Testing, which formula o use on TI-84

    A researcher wishes to estimate the number of households with 2 computers. How large a sample is needed in order to be 98% confident that the sample...

    Started by AUcs13‎, 04-30-2013 08:07 PM
    • Replies: 0
    • Views: 3,621
    04-30-2013, 08:07 PM Go to last post
  38. Binary Logistic Regression - SPSS - logit plots for categorical predictors?

    My initial question was how do I check for linearity in binary logistic regression when using categorical predictors. I've learned that I would use...

    Started by jessireebob‎, 04-30-2013 06:47 PM
    • Replies: 0
    • Views: 1,813
    04-30-2013, 06:47 PM Go to last post
  39. Testing a claim about a Mean. !Standard deviation "Not know"!

    Before I write out my question I just want to say this is my first post ever on these forums, i'm Nemis nice to meet yall. I already know how to...

    Started by Nemis‎, 04-30-2013 03:35 PM
    • Replies: 2
    • Views: 3,469
    04-30-2013, 04:45 PM Go to last post
  40. Need Help on Hypothesis testing

    The question is: The health of employess is monitored by periodically weighing them in. A sample of 54 employees has a mean weight of 183.9...

    Started by AUcs13‎, 04-30-2013 11:12 AM
    • Replies: 1
    • Views: 1,241
    04-30-2013, 04:26 PM Go to last post
  41. Probability of multiple events with different chances

    Heyas! I'm playing Fire Emblem: Awakening, and for funsies I'm trying to figure out the chance of X number of 'stat ups' per level up. Each level,...

    Started by Jozrael‎, 04-28-2013 08:07 AM
    • Replies: 3
    • Views: 1,514
    04-30-2013, 02:54 PM Go to last post
  42. Please help! Which test..reward!!

    my dissertation is in tomorrow and i really need to know which statistical test to run on my study. I will internet bank £15 to anyone who can...

    Started by HELP123‎, 04-30-2013 09:54 AM
    • Replies: 14
    • Views: 1,786
    04-30-2013, 02:14 PM Go to last post
  43. Binary Logistic Regression - Hosmer-Lemeshow vs -2LL & nonsig predictors

    Hi all, I'm hoping this community might be able to provide some help. I've tried searching the forums here, looking online, referencing my lecture...

    Started by jessireebob‎, 04-30-2013 09:12 AM
    • Replies: 5
    • Views: 1,938
    04-30-2013, 12:40 PM Go to last post
  44. Please help

    if my test has two groups of people (7 in each) who each do an oppasite strethcing routine and are velocity testsed and then come back a week later...

    Started by HELP123‎, 04-30-2013 10:53 AM
    • Replies: 1
    • Views: 1,166
    04-30-2013, 10:57 AM Go to last post
  45. Big ANCOVA/ANOVA Problems

    I am going through all my data in my thesis and have spotted another huge (well i'm worrying myself that it is) problem. It involves a 2x2...

    Started by benjwalt‎, 04-30-2013 10:32 AM
    • Replies: 0
    • Views: 1,141
    04-30-2013, 10:32 AM Go to last post
  46. Statistics Headache - Any help gratefully appreciated!

    Hi everyone, I have spent the good part of a week scouring the internet, trying to work this out and would be so grateful if someone could help...

    Started by benjwalt‎, 04-29-2013 01:03 PM
    • Replies: 7
    • Views: 1,583
    04-30-2013, 10:30 AM Go to last post
  47. What test to use for effect of personality on categorical data?

    I want to find out the effect of personality (The big five - measured with a likert scale) on a yes/no decision, what test would I use for this? Can...

    Started by psycstudentx‎, 04-30-2013 09:49 AM
    • Replies: 0
    • Views: 932
    04-30-2013, 09:49 AM Go to last post
  48. Is error rate data normally distributed?

    Hi All, I have performed an experiment where I collect the number of 'typing errors' that has occurred. For instance, a user entered 51 different...

    Started by pp664‎, 04-29-2013 10:30 PM
    normality
    • Replies: 1
    • Views: 1,430
    04-30-2013, 09:44 AM Go to last post
  49. "Propagating" Degrees of Freedom

    Good evening! -Background I'm a chemistry student who's received some elementary training in statistics. At the moment, I need to take...

    Started by taharka‎, 04-29-2013 10:49 PM
    • Replies: 2
    • Views: 3,512
    04-29-2013, 11:20 PM Go to last post
  50. (categorical data - small sample) Appropriate test(s)?

    Greetings! I have a small sample (11 responses) of categorical data. I want to compare a binary response (near vs. far) to a nominal response...

    Started by JLC‎, 04-29-2013 10:29 PM
    categorical, chi squared help, fisher's exact test, small sample size
    • Replies: 0
    • Views: 1,781
    04-29-2013, 10:29 PM Go to last post
  51. Sum of stationary time series

    Suppose X_{t} and Y_{t} are stationary time series with spectral densities f_{x}(v) and f_{y}(v) respectively. Show that Z_{t} = X_{t} + Y_{t} is...

    Started by lord12‎, 04-29-2013 04:42 PM
    • Replies: 5
    • Views: 1,333
    04-29-2013, 06:41 PM Go to last post
  52. Mean and Median for testing data distribution

    Hi, I noticed that in the following articles data distribution is tested via checking for >10% difference in mean and median. ...

    Started by DanR‎, 04-05-2013 01:22 PM
    data distribution, means, median, normal curve
    • Replies: 4
    • Views: 2,516
    04-29-2013, 04:33 PM Go to last post
  53. Independent Stationary TIme Series

    Suppose z_{t} = x_{t}y_{t} where x_{t} and y_{t} are 0 mean, independent stationary time series. What is the autocovariance function of z_{t}? Show...

    Started by lord12‎, 04-29-2013 04:24 PM
    • Replies: 0
    • Views: 1,140
    04-29-2013, 04:24 PM Go to last post
  54. T-Distribution, Hypothesis Test... Using P-Vale Approach

    This problem is confusing me quite a bit. I know how to do the classical method, no problem. But the P-Value approach is throwing me for a loop. I...

    Started by PSG‎, 04-29-2013 02:59 PM
    • Replies: 2
    • Views: 1,853
    04-29-2013, 04:10 PM Go to last post
  55. Question Cumulative relative frequencies

    I have a problem I do not understand. I always end up with result 0.99 instead of 1. See lines 22 and 40: http://pastebin.com/hVcLbVAW Am I not...

    Started by 5747157‎, 04-29-2013 02:26 PM
    cumulative, frequencies, relative
    • Replies: 0
    • Views: 1,092
    04-29-2013, 02:26 PM Go to last post
  56. Why beta signs of interactions do not rely on the dependent variable's coding?

    I have a binary logistic regression model with some IVs (main variables and their interactions). I am playing with it to see if everything is OK, or...

    Started by victorxstc‎, 04-29-2013 12:30 PM
    • Replies: 2
    • Views: 1,091
    04-29-2013, 01:26 PM Go to last post
  57. What stats do I need to do for a clinical audit I have done?

    Hello, sorry if I am a complete noob. Believe it or not i did further maths A Level including s1-4 (if you know what that means) but that was 10...

    Started by willavom‎, 04-29-2013 01:25 PM
    • Replies: 0
    • Views: 1,368
    04-29-2013, 01:25 PM Go to last post
  58. Experimental design

    Hi, I have to design an experiment for a class, n i have to use statistical application. i am doing a research on a disease, n i have to find out...

    Started by xxdesigulxx‎, 04-29-2013 10:23 AM
    • Replies: 1
    • Views: 1,313
    04-29-2013, 11:07 AM Go to last post
  59. Interpreting "Within-subjects contrasts" in Mixed ANOVA

    Greeting stats peers, After conducting a 2x2x(3) Mixed Model ANOVA, I am struggling to understand the SPSS output "Within subjects contrast" ...

    Started by Zack‎, 04-29-2013 06:05 AM
    contrasts, interaction effect, mixed anova
    • Replies: 0
    • Views: 2,812
    04-29-2013, 06:05 AM Go to last post
  60. Mixed-effects model for a strongly unbalanced design

    Hi all, I am somehow unsure on the best option to analyze these data. Here it is my study case: The response variable is a morphometric...

    Started by simone77‎, 04-25-2013 06:08 AM
    • Replies: 1
    • Views: 1,505
    04-29-2013, 05:30 AM Go to last post

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