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Forum: Statistics

Statistics course and homework discussion. Elementary statistics.

  1. 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: 67,066
    09-30-2005, 09:44 AM Go to last post
  2. 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: 197,322
    07-16-2014, 11:01 AM Go to last post
  1. Best fit in Correspondence Analysis

    Hi, Presently, my analysis shows chi-square being not significant (p>0.05) - which actually means that total inertia is not so different from zero....

    Started by zabbs‎, 08-18-2010 02:17 AM
    • Replies: 4
    • Views: 4,506
    08-20-2010, 04:23 PM Go to last post
  2. Struggling with finding a distribution...

    Hi All, When I use a histogram to view my data, I get the following... (see age.png) I'm trying to figure out the distribution... From...

    Started by nami1234‎, 08-20-2010 04:06 PM
    • Replies: 4
    • Views: 2,437
    08-20-2010, 06:01 PM Go to last post
  3. Simple dissertation stats question

    I know this is an easy answer for those of you who understand stats, but no matter how many statistics class I've taken and even passed, I just still...

    Started by Serina81‎, 08-20-2010 03:48 PM
    • Replies: 1
    • Views: 2,573
    08-20-2010, 06:38 PM Go to last post
  4. System Processing Forecast

    I am working to come with a mathematical / statistical model for the following. We have a computer program that processes transaction with many...

    Started by Ramamop‎, 08-20-2010 07:15 PM
    • Replies: 0
    • Views: 3,469
    08-20-2010, 07:15 PM Go to last post
  5. Question K-S test interpretation in R

    Dear all I am doing a Kolmogorov-Smirnov test in R in order to test if the two variables are from the same distribution. Turns out that I don't...

    Started by pinto‎, 08-20-2010 06:58 AM
    • Replies: 3
    • Views: 46,818
    08-21-2010, 07:27 AM Go to last post
  6. Can't determine what test to use

    I have this chemistry stat question. It has like a story to it, but the bottom line is, theres a guy who had broken glass in his coat, they...

    Started by Danial‎, 08-21-2010 01:43 AM
    • Replies: 5
    • Views: 4,844
    08-21-2010, 08:41 PM Go to last post
  7. Service Survey Statistically Significant Change

    Hi All, I was really trying to find the answer from the thousands of similar posts here but had no luck... I have a customer service survey with...

    Started by twikken‎, 08-21-2010 09:19 PM
    • Replies: 0
    • Views: 3,134
    08-21-2010, 09:19 PM Go to last post
  8. Analysing interactions

    I have a 2x2x3 design, with two between-participants factors (goal specificity and interactivity) and one repeated-measures factor (difficulty). I...

    Started by thisisnic‎, 08-22-2010 08:15 AM
    • Replies: 0
    • Views: 2,021
    08-22-2010, 08:15 AM Go to last post
  9. Smile Analysis of my results

    Hi, I have just finished a research where I performed a comparison of the latest Australian healthcare reforms against the 123 NHHRC...

    Started by drsayanta‎, 08-22-2010 10:38 AM
    • Replies: 0
    • Views: 1,962
    08-22-2010, 10:38 AM Go to last post
  10. one way or two way ANOVA

    Hi, I have three groups of peoples in my study, for each group i have measured the amount of iron in 5 different organs. I am not sure what test...

    Started by stat_18‎, 08-22-2010 07:58 PM
    • Replies: 2
    • Views: 2,643
    08-23-2010, 08:55 AM Go to last post
  11. Contrasts - reporting results

    Are contrast conclusions supposed to include the mean score of each group and the mean difference? Or just one? How do you properly report the mean...

    Started by jj09‎, 08-23-2010 09:20 AM
    • Replies: 0
    • Views: 6,655
    08-23-2010, 09:20 AM Go to last post
  12. Four-Way ANOVA

    Hello, I want to analyse the effects of four categorical independent variables on one dependnet variable. For each independent variable, I have two...

    Started by rahuls‎, 08-23-2010 01:47 PM
    • Replies: 0
    • Views: 4,208
    08-23-2010, 01:47 PM Go to last post
  13. Need help on these Stat questions I missed on my test.

    If the graph is skewed to the right what is bigger, the mean or median? A set of data is found to have a sample standard deviation of 25. Suppose...

    Started by Cosmo‎, 08-22-2010 08:30 PM
    • Replies: 3
    • Views: 3,387
    08-23-2010, 02:16 PM Go to last post
  14. Experiments and replicates

    Hi all. The experiment: I treat a substrate "S" with different concentrations of factor "A" and observe the effect on factor "B". In one...

    Started by stefanbg‎, 08-23-2010 03:54 AM
    • Replies: 2
    • Views: 3,346
    08-23-2010, 03:10 PM Go to last post
  15. Question Zero in cell for Fisher's Exact?

    Good evening, I finally figured out how to get my version of SPSS to report Fisher's Exact numbers...that took several days! Most places on the...

    Started by August 15‎, 08-23-2010 09:43 PM
    • Replies: 0
    • Views: 7,200
    08-23-2010, 09:43 PM Go to last post
  16. Anova help

    Hi all, I am having a bit of a problem now when my statistical analysis is getting more complicated ;) In my research project I have two...

    Started by hildur‎, 08-23-2010 11:51 AM
    • Replies: 4
    • Views: 2,017
    08-24-2010, 09:03 AM Go to last post
  17. Correlation b/t categorical and continuous variables

    Lets say that I have a continuous variable, such as height in inches. I also have a 3-value categorical variable for height, such as short, average,...

    Started by Link‎, 08-24-2010 05:11 PM
    • Replies: 1
    • Views: 6,114
    08-24-2010, 05:32 PM Go to last post
  18. mann withney test

    i have used a copying scale, that ask about 14 coping styles .. the questions are likert type. since the distribution of the responces was not...

    Started by nurul‎, 08-24-2010 01:24 PM
    • Replies: 5
    • Views: 4,276
    08-25-2010, 02:43 AM Go to last post
  19. Confidence interval

    The experimenter who collected these data wants to take another sample in order to find a 99% confidence interval for μ that is 3 units wide. Use...

    Started by Cookie‎, 08-25-2010 09:09 AM
    • Replies: 2
    • Views: 3,141
    08-25-2010, 10:00 AM Go to last post
  20. How to treat 'over the years' data during regression

    Hi, I have a dataset which has values for variables for each company for six different years. What data should I use for doing regression and...

    Started by weakatstats‎, 08-25-2010 12:48 PM
    • Replies: 1
    • Views: 1,977
    08-25-2010, 12:56 PM Go to last post
  21. Smile er? only 4 choices in dependable variable?

    Hi guys, Doing a bit of work for Uni which requires some statistics. In the past I have carried out different tests however after some...

    Started by malun101‎, 08-25-2010 02:32 PM
    • Replies: 0
    • Views: 1,995
    08-25-2010, 02:32 PM Go to last post
  22. Test for non-normal, non-independent samples

    The situation... I want to determine whether the "average $ per mailed customer" (to a direct mail appeal) is statistically different for Group A...

    Started by jawon‎, 08-24-2010 04:53 PM
    • Replies: 2
    • Views: 2,926
    08-25-2010, 04:20 PM Go to last post
  23. False Discovery Rate (FDR)

    Hi Guys, I have been asked to use the FDR instead of Bonferroni. Unfortunately I have never heard of it. Any ideas please? Thanks Ali

    Started by stat_18‎, 08-25-2010 04:33 PM
    • Replies: 0
    • Views: 2,090
    08-25-2010, 04:33 PM Go to last post
  24. Question expected B

    is (the expected B) that appear in logestic regression is the same as odds ratio? is it the adjusted odds ratio?? please make it clear to me

    Started by nurul‎, 08-26-2010 12:52 AM
    • Replies: 2
    • Views: 3,656
    08-26-2010, 01:54 AM Go to last post
  25. Question age and Mann-Whitney test

    urgent question, i have the age variable not normaly ditrrebuted and i wanted to explore its association with the outcome (not case , case) at...

    Started by nurul‎, 08-26-2010 08:31 AM
    • Replies: 1
    • Views: 4,008
    08-26-2010, 09:50 AM Go to last post
  26. Time series - autoregressive and autocorrelation models

    anyone using this text : http://www.amazon.com/Second-Course-Statistics-Regression-Analysis/dp/0130223239 I am quite confused with...

    Started by zellle‎, 08-26-2010 12:19 PM
    • Replies: 1
    • Views: 5,416
    08-26-2010, 12:54 PM Go to last post
  27. Red face Categories with 1 or two respondents

    i have to see if there is association between the out come and some variables i convert them to catigories like the country of origin i have 4...

    Started by nurul‎, 08-26-2010 10:34 PM
    • Replies: 0
    • Views: 2,154
    08-26-2010, 10:34 PM Go to last post
  28. Correspondence Analysis: Lowest cell frequency?

    Dear All, First of all I would like to thank those of you who suggested that I could use CA for my research on elections in December last year. It...

    Started by SAJ‎, 08-27-2010 03:04 AM
    • Replies: 0
    • Views: 1,861
    08-27-2010, 03:04 AM Go to last post
  29. Statistics question, can you help?

    I am doing a university course and it is divided into to two parts, assignments (65%) and exam (35%). If I was to get a B average (75%/100) for my...

    Started by jake_110118‎, 08-27-2010 06:44 PM
    • Replies: 1
    • Views: 2,483
    08-27-2010, 06:59 PM Go to last post
  30. Distributions

    Let Z1,.....Z6 be a random sample of six observations from the N(0,1) distribution, and let: Z bar = 1/6(summation from 1 to 6) of Zi and S^2 =...

    Started by Cookie‎, 08-23-2010 08:19 PM
    • Replies: 4
    • Views: 3,923
    08-27-2010, 09:39 PM Go to last post
  31. T-test on house prices

    I'm carrying out research into whether the implementation of a transport system has resulted in a price rise in property values. I have two groups...

    Started by ozric‎, 08-28-2010 02:37 AM
    • Replies: 2
    • Views: 2,560
    08-28-2010, 03:11 AM Go to last post
  32. We need help with hypothesis testing for a difference between proportions

    Essentially we are looking at a study of a group of 34 facilities--17 type A facilities and 17 type B facilities. Using one measure, 6 of the 17 type...

    Started by Nonprofit organization‎, 08-28-2010 04:55 PM
    • Replies: 5
    • Views: 4,778
    08-28-2010, 08:46 PM Go to last post
  33. Fair Coin... Chi square or binomial?

    Hello all, this is my first post, so please be gentle with me. When testing whether a coin is fair or not, is it correct to use the binomial...

    Started by TheDuck‎, 08-28-2010 09:03 PM
    • Replies: 7
    • Views: 18,690
    08-29-2010, 01:24 PM Go to last post
  34. Scheffe critical value question (easy)

    A researcher collects data about the efficacy of a new medication for ADHD in the context of an existing medication, a placebo, and no treatment. She...

    Started by jj09‎, 08-27-2010 12:05 AM
    • Replies: 2
    • Views: 8,483
    08-30-2010, 10:37 PM Go to last post
  35. Talking Make survey to find trends

    Good afternoon, Thank you for reading my thread. I am making a very exciting study of what makes people attractive. My background is as a...

    Started by MariusJonsson‎, 08-31-2010 10:14 AM
    • Replies: 0
    • Views: 2,631
    08-31-2010, 10:14 AM Go to last post
  36. Proportion receiving a treatment

    Dear all, thank you for taking the time to answer I'm wondering whether I have the right method to compare 4 proportions: Group, Treated, ...

    Started by chloropleth2‎, 08-31-2010 11:25 AM
    • Replies: 0
    • Views: 1,848
    08-31-2010, 11:25 AM Go to last post
  37. Question independent t test

    i have two variables: one the age and the dependent variable is stress age is normaly distributed the outcome or deprndent variable stress is...

    Started by studentin‎, 09-01-2010 12:57 AM
    • Replies: 5
    • Views: 4,633
    09-01-2010, 02:10 AM Go to last post
  38. Linear regression question

    For F, i find x is 11.5 then to calculate the CI we're given this formula for question it's then we use that SDx and times it by the tcrit for...

    Started by Danial‎, 09-02-2010 02:38 AM
    • Replies: 0
    • Views: 2,226
    09-02-2010, 02:38 AM Go to last post
  39. Estimating type 1 error post-hoc VS post-hoc samples size calculation

    Hi, I have completed a small randomized clinical trial where I surprisingly observed a statistically significant survival (p=0.02) benefit with a...

    Started by endocardium‎, 09-02-2010 04:49 AM
    • Replies: 0
    • Views: 5,097
    09-02-2010, 04:49 AM Go to last post
  40. Question A Medical Imaging statistics Question

    Hi, I did a training project a work a while ago and I never found a satisfactory answer to a inferential statistics problem. This question might...

    Started by csa84‎, 09-02-2010 10:32 AM
    • Replies: 1
    • Views: 2,867
    09-02-2010, 11:03 AM Go to last post
  41. Question Margin of Error - Confidence Level

    I sent out a questionnaire to hundreds of people and recieved 154 responses. Some of the questions have a yes/no answer. So for one of them I...

    Started by psrs0810‎, 09-01-2010 01:54 PM
    • Replies: 12
    • Views: 6,343
    09-02-2010, 03:51 PM Go to last post
  42. Help with a pilot cohort study sample size estimation

    Hi everyone, I am a new research student and I am struggling now. Please can anyone advise me on sample size required for my project? I am...

    Started by godsaveme‎, 09-02-2010 11:07 AM
    • Replies: 4
    • Views: 8,224
    09-02-2010, 06:18 PM Go to last post
  43. Exclamation Don't Know where to start!!

    Hey Everyone!! I hope someone can help me with this. I have data that was collect a year ago on a weight lose study. The sample size is 8...

    Started by FiFi210‎, 09-01-2010 07:54 AM
    • Replies: 6
    • Views: 3,615
    09-03-2010, 09:14 AM Go to last post
  44. Can't decide on statistical test...

    I really am stumped. I can do most statistical tests myself, but I can't for the life of me work out which test to use on this occasion. I have...

    Started by Captainrave‎, 09-03-2010 09:13 AM
    • Replies: 5
    • Views: 3,430
    09-03-2010, 12:48 PM Go to last post
  45. Cohen's d for within-design

    I am having problems in understanding and calculating the effect size for the following conditions. Basically I have 13 subjects and a within...

    Started by valex‎, 09-03-2010 01:58 PM
    • Replies: 1
    • Views: 6,947
    09-03-2010, 04:24 PM Go to last post
  46. Which tests to use?

    Hi, I am conducting research comparing child anxiety type (anxious vs non-anxious) on their parents' parenting style (5 styles), to see if anxious...

    Started by psycnik‎, 08-10-2010 10:27 PM
    • Replies: 1
    • Views: 2,533
    09-03-2010, 08:16 PM Go to last post
  47. Poisson distribution

    Hi I am new to this but I wonder if anyone can help. I have a data set for number of insects caught in different habitats and have been analysing...

    Started by Sasco‎, 09-01-2010 06:47 AM
    • Replies: 3
    • Views: 6,237
    09-05-2010, 06:00 AM Go to last post
  48. Angry Missing values

    On the basis of the partially completed contingency table below, select all the true statements from the following list: (note that the given...

    Started by SadieKhan‎, 09-04-2010 03:07 AM
    • Replies: 11
    • Views: 7,071
    09-05-2010, 04:08 PM Go to last post
  49. Compare means between groups

    Hi, I am currently writing my master thesis in finance and have a question of pretty basic nature. I would be very grateful if someone could help...

    Started by landers‎, 08-20-2010 08:38 AM
    • Replies: 6
    • Views: 6,339
    09-06-2010, 06:24 AM Go to last post
  50. Hypothesis Testing for Paired Sample

    In hypothesis testing of means for paired sample,why do we have only t test ? why don't we have similar z test?

    Started by stata‎, 09-06-2010 10:09 AM
    • Replies: 5
    • Views: 3,520
    09-06-2010, 02:13 PM Go to last post
  51. Logistic Regression Output

    Hi, I have done a logistic regression but am having trouble interpreting the output. I looked at the effect of three vegetation types (H M L) and...

    Started by VictoriaS‎, 09-05-2010 01:02 AM
    • Replies: 5
    • Views: 7,318
    09-06-2010, 02:57 PM Go to last post
  52. Interaction and Main effect

    Hi, I have one general question. I want to know whether I need to add an interaction term. Let's say I have two categorical variables (X & Y)...

    Started by chpeng0111‎, 09-06-2010 09:31 AM
    • Replies: 1
    • Views: 4,352
    09-06-2010, 05:51 PM Go to last post
  53. interpreting linear and curvilinear effect

    hi! I'm testing linear and curviliear effects of one continuous IV in another continuos DV. I've centered the IV (IVc) and squared it (IVcsq)...

    Started by Mariana Ramos‎, 09-07-2010 05:21 AM
    • Replies: 0
    • Views: 5,244
    09-07-2010, 05:21 AM Go to last post
  54. Regression Model with scaled intercept

    I'm using the following OLS-regression model: Y = a + b1*X1 + b2*X2 + e Now all of the variables in my sample get scaled (by ta), so that: ...

    Started by startistiker‎, 09-07-2010 11:01 AM
    • Replies: 0
    • Views: 3,359
    09-07-2010, 11:01 AM Go to last post
  55. Basic Time Series Question Regarding Transformations

    This question is regarding a time series problem using the classical decomposition model Xt=Tt+St+Nt After a log transformation to the data, I am...

    Started by mlin0823‎, 09-06-2010 06:43 AM
    • Replies: 2
    • Views: 2,057
    09-07-2010, 12:33 PM Go to last post
  56. Conditional Probabiltiy

    Hey, I'm trying to evaluate a conditional probability and I'm not able to figure it out. It's fairly simple: two random variables, both Normal with...

    Started by hman‎, 09-06-2010 10:46 AM
    • Replies: 2
    • Views: 1,900
    09-07-2010, 04:06 PM Go to last post
  57. Profit probability

    Is there any way that I can determine a level of confidence (preferably using Excel) that a particulal betting system might prove profitable? ...

    Started by johnnic‎, 09-07-2010 04:28 AM
    • Replies: 3
    • Views: 4,082
    09-08-2010, 06:46 AM Go to last post
  58. a quick stats questions about p and F/t values

    Hi, I am pretty new to stats and am doing a heap of F-tests and t-tests. i was under the impression that when the calculated value (F or t) was...

    Started by sqrt‎, 09-08-2010 01:12 AM
    • Replies: 1
    • Views: 2,827
    09-08-2010, 09:52 AM Go to last post
  59. Help

    Is there any body can help me in data analysis and result interpretation? I'll pay for that job as it is very necessary to finish my research...

    Started by Therapy‎, 08-25-2010 09:29 AM
    • Replies: 4
    • Views: 3,492
    09-08-2010, 11:16 AM Go to last post
  60. Post hoc tests for a mixed 2 X 3 X 3 X 2 ANOVA

    Hi there I would be eternally grateful for any assistance with the following query. I am in the process of analysing some results for my MSc...

    Started by Dave M‎, 09-08-2010 03:56 PM
    • Replies: 0
    • Views: 3,836
    09-08-2010, 03:56 PM Go to last post

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