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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: 66,934
    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: 197,119
    07-16-2014, 11:01 AM Go to last post
  1. Gini Coefficient

    The Gini coefficient is used to compare two distributions. Based on the Wiki pape, applications are wide spread and Gini has been applied in...

    Started by ampleforth‎, 09-19-2010 03:31 AM
    • Replies: 1
    • Views: 5,378
    09-19-2010, 09:28 AM Go to last post
  2. Logistic Regression: Interpreting Continuous Variables

    Hi All, I had a couple of questions about interpreting odds ratios for continuous variables in logistic regression. I've done some significant...

    Started by amr262‎, 05-05-2014 05:32 AM
    logistic regression
    • Replies: 0
    • Views: 2,826
    05-05-2014, 05:32 AM Go to last post
  3. Reports Dynamically

    Is there any statistical tool by which we can generate reports dynamically? I will explain in detail. In case of SPSS, if i did an...

    Started by amritags‎, 07-20-2011 05:08 AM
    • Replies: 0
    • Views: 1,497
    07-20-2011, 05:08 AM Go to last post
  4. Which statistical test?

    Hi I have an exam on Monday and am trying to work out on practice question we received in class. It asks us to identify and match the appropriate...

    Started by ams‎, 05-18-2007 01:17 AM
    • Replies: 1
    • Views: 2,719
    05-21-2007, 07:15 PM Go to last post
  5. Why do degrees of freedom matter?

    I work with Generalised Linear Models and we use use tests such as chi squared test and the AIC test to compare how good models are. These tests are...

    Started by amsbam1‎, 12-12-2013 12:34 PM
    • Replies: 6
    • Views: 11,575
    12-12-2013, 02:30 PM Go to last post
  6. Question on Mean, SD and SEM

    A professor has a sample of 500 subjects. The mean is 40, median is 20, range 10-100. a. Could this professor calculate a useful interval with...

    Started by amtrip‎, 12-06-2014 11:59 PM
    • Replies: 1
    • Views: 2,180
    12-07-2014, 01:48 AM Go to last post
  7. Sample error management

    Hi Friends, My problem I need to prepare a report on performance time for 12 similar applications that are similar in nature and also have similar...

    Started by amumathi‎, 08-21-2009 01:34 AM
    • Replies: 0
    • Views: 1,843
    08-21-2009, 01:34 AM Go to last post
  8. binomial/sign test

    Hi, I was wondering if anyone could please help me out with a binomial test for accuracy data as I'm finding it hard to find any examples using...

    Started by amunn‎, 05-03-2009 06:55 PM
    • Replies: 0
    • Views: 2,740
    05-03-2009, 06:55 PM Go to last post
  9. I need your help (Urgent)

    Hi, I received the below statistics question from my teacher please help me to solve it. Question: When approaching an iceberg, the captain...

    Started by amva‎, 09-12-2011 12:35 AM
    statistics, urgent
    • Replies: 1
    • Views: 2,215
    09-12-2011, 12:59 AM Go to last post
  10. Standard deviation effect with single variable

    Hi, I have a question about the project I am setting up and was wondering if anyone could point me in the right direction. I feel like I am...

    Started by amw2320‎, 07-27-2011 12:17 PM
    • Replies: 0
    • Views: 2,323
    07-27-2011, 12:17 PM Go to last post
  11. Do I plot a bar graph with unadjusted or adjusted means??

    I want to plot a bar graph of mean weight, but should I plot the mean weight that I obtained from raw data, or do I need to plot the estimated...

    Started by amygdala‎, 03-28-2008 09:44 AM
    • Replies: 0
    • Views: 6,480
    03-28-2008, 09:44 AM Go to last post
  12. How should I statistically analyse this study?

    HI, I'm a 3rd year medical student studying in Sydney, Australia. I am currently working at one of the hospitals and am conducting a patient...

    Started by amygib‎, 08-01-2007 10:16 PM
    • Replies: 1
    • Views: 2,349
    08-01-2007, 11:24 PM Go to last post
  13. Unhappy Non-probability sampling stuff

    Hi there, Sorry probably asking a very basic question but just want to make sure... Am I right in saying that if I have surveyed people using a...

    Started by amyj‎, 09-09-2005 02:11 PM
    • Replies: 3
    • Views: 7,305
    09-09-2005, 03:23 PM Go to last post
  14. Statistics sample / popoualtion question. CoNFuSeD!?

    Imagine a total population of T people, made up a total of M men and F women. T = M + F Now imagine I draw a sample of R people from this...

    Started by AmyMS‎, 11-26-2008 11:15 AM
    • Replies: 2
    • Views: 2,166
    11-26-2008, 02:40 PM Go to last post
  15. What statistical test should be used?

    I've collected data on the number of individuals of seven species at three different sites and want to test if there is a statistically significant...

    Started by amyt997‎, 08-03-2016 04:37 PM
    statistical test
    • Replies: 0
    • Views: 1,080
    08-03-2016, 04:37 PM Go to last post
  16. Probability Question

    suppose a reading between 30 and 40 is called very interesting from an archaeological point of view. let us say you take readings at n=12 sites...

    Started by amywhitfield‎, 10-14-2013 11:59 PM
    • Replies: 0
    • Views: 1,475
    10-14-2013, 11:59 PM Go to last post
  17. Question Probability without z-score?

    Estimate mean of male students on campus. Standard deviation of the heights of young men is about 2.8 inches. Suppose (unknown to you) the mean...

    Started by An0n‎, 10-05-2011 12:12 AM
    help needed, probabilty, standard deviation, z-score
    • Replies: 1
    • Views: 3,148
    10-05-2011, 12:16 AM Go to last post
  18. Help needed in SPSS

    Hello ! With a friend, we have a paper to write about the fail of measures to counter the illegal downloading of music in our country, for that...

    Started by Anabelle‎, 09-15-2017 06:19 AM
    • Replies: 5
    • Views: 380
    09-21-2017, 06:41 AM Go to last post
  19. Unhappy Help with calculating significance of the results

    Hello, I am doing down-stream analysis of genomic data. I have 'X' number of occurrences in our 2000 gene sequences of interest. I have generated...

    Started by anagari‎, 10-21-2010 12:59 PM
    • Replies: 8
    • Views: 3,314
    10-22-2010, 10:32 AM Go to last post
  20. 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: 2,595
    03-05-2013, 03:10 PM Go to last post
  21. Question Help me out: Computing SE CV SED LSD

    Dear All, In calculating standard error of mean (SE) and coefficient of variation (CV) for summary table of means exported to excel from SAS anova...

    Started by analyst‎, 09-13-2006 08:19 AM
    • Replies: 0
    • Views: 9,640
    09-13-2006, 08:19 AM Go to last post
  22. Stat. Sig of a dollar amount

    Need help measuring the statistical significance of when a customer responds to a solicitation, & the size of their purchase. This is a direct...

    Started by Analyst1‎, 08-24-2007 09:20 AM
    • Replies: 1
    • Views: 2,314
    08-24-2007, 10:34 AM Go to last post
  23. split halves test

    I just read there was something called a split halves test: If you get a 95% or so significance that means youll still be wrong in 5% of the cases....

    Started by Analytics‎, 07-24-2007 05:28 PM
    • Replies: 0
    • Views: 2,345
    07-24-2007, 05:28 PM Go to last post
  24. Computing statistical significance for qualitative data?

    In internet marketing there's something called pay per click marketing. You only pay if a user clicks on your ad. You can also test different ads to...

    Started by Analytics‎, 07-24-2007 05:35 PM
    • Replies: 0
    • Views: 4,440
    07-24-2007, 05:35 PM Go to last post
  25. computing a confidence interval for 1 variable / jarque bera test necessary?

    Say I have a data sample and want to compute the 95% confidence interval for the mean of this data sample. If the sample is big enough I can...

    Started by Analytics‎, 07-24-2007 05:38 PM
    • Replies: 1
    • Views: 5,488
    07-24-2007, 05:45 PM Go to last post
  26. one-sided vs. two-sided hypothesis test (exp?)

    My first language isnt English so hopefully you guys understand what Im trying to say by one-sided vs. two-sided? What I found pretty confusing in...

    Started by Analytics‎, 07-24-2007 05:41 PM
    • Replies: 2
    • Views: 4,700
    07-25-2007, 11:42 AM Go to last post
  27. assuming a variable is/variables are normally distributed

    Ive read and also been told on here that if the sample size is > 30 I can assume the variable is normally distributed. I'm wondering if 30 isn't a...

    Started by Analytics‎, 08-19-2007 06:56 PM
    • Replies: 2
    • Views: 4,020
    08-19-2007, 10:54 PM Go to last post
  28. impact of factors of search engine rankings

    I read a study that I think is very flawed. It's in German, though and it's probably flawed intentionally by the webmaster, but it raised a question...

    Started by Analytics‎, 08-28-2007 06:50 PM
    • Replies: 5
    • Views: 2,935
    08-29-2007, 05:59 PM Go to last post
  29. Is this a valid approach?

    I asked this in another thread, but unfortunately I still don't know whether it's possible to do this or not. I'll keep my question/example as brief...

    Started by Analytics‎, 08-29-2007 06:06 PM
    • Replies: 6
    • Views: 2,447
    08-30-2007, 03:30 PM Go to last post
  30. logistic regression & saturation

    I had 2 statistics classes, the first one was about the very very basics not going into detail about regression analysis. However we had diff. kinds...

    Started by Analytics‎, 09-03-2007 06:58 AM
    • Replies: 1
    • Views: 3,964
    09-03-2007, 10:35 AM Go to last post
  31. two auto-correlation questions

    Hello, I'm just wondering if I really understand what auto-correlated error terms are: Say I'm looking at time series data of the points per...

    Started by Analytics‎, 12-24-2007 05:45 PM
    • Replies: 3
    • Views: 4,071
    12-27-2007, 12:16 PM Go to last post
  32. Is this a case of auto-correlation?

    There's a person (sort of like a mentor) who I send a lot of e-mails to. During certain periods (when I need help) I send him quite a lot of e-mails....

    Started by Analytics‎, 01-17-2008 07:17 PM
    • Replies: 0
    • Views: 2,584
    01-17-2008, 07:17 PM Go to last post
  33. How to prove the magnitude of improvement (two data sets)?

    Hi Guys! I am struggling a bit with some statistical validations. Currently using Google Analytics in order to get data from my website. Testing...

    Started by analytics_stats‎, 10-01-2016 10:55 AM
    • Replies: 2
    • Views: 1,081
    10-02-2016, 10:36 AM Go to last post
  34. Help! I need to use R to calculate a recursive function!

    hi,all Z(i)=0.05X(i)+0.95Z(i-1), where i = 1.....32, and X's are given data, the question is how to use r to get the 32 values of Z. I couldn't do...

    Started by anan1986‎, 03-09-2010 04:20 PM
    • Replies: 2
    • Views: 2,360
    03-09-2010, 11:37 PM Go to last post
  35. Simple question about a repeated trial

    Say I have a die that I throw an N number of times and I record the distribution of 1s, 2s, .. 6s. Can we say anything about this distribution? Will...

    Started by anandkapur‎, 01-30-2009 12:14 AM
    • Replies: 6
    • Views: 2,077
    02-03-2009, 04:29 PM Go to last post
  36. Proof of why this happens

    I have a task that I think runs in 2 milliseconds. To judge it's performance, I time it, but the granularity of my timer is 16ms. In other words when...

    Started by anandkapur‎, 02-03-2009 04:39 PM
    • Replies: 1
    • Views: 2,353
    02-05-2009, 07:57 AM Go to last post
  37. Question Simple question about sampling

    If I know nothing about a particular distribution, is there a way for me to draw samples from it so as to determine it's characteristics? I'd be...

    Started by anandkapur‎, 04-11-2012 08:36 PM
    • Replies: 1
    • Views: 1,717
    04-11-2012, 09:09 PM Go to last post
  38. Help with Managerial report

    I have to generate a report and need help with data and its interpretation. Please help - I am using excel and statdisk Data: School Enroll Per...

    Started by anasir‎, 07-31-2008 12:26 PM
    • Replies: 0
    • Views: 2,939
    07-31-2008, 12:26 PM Go to last post
  39. 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: 1,009
    05-02-2013, 03:05 AM Go to last post
  40. False positive qustion

    Hey All I have a quick question while I was preparing my self to an interview I have , this is the question : What is better :having 10 false...

    Started by AnatA‎, 10-28-2016 06:21 AM
    • Replies: 1
    • Views: 1,223
    10-28-2016, 07:28 AM Go to last post
  41. No S.E. C.R. or p value in my SEM AMOS output

    Iím a bit concerned about the fact that I am not getting S.E., C.R or p values for many regressions (in some models). That table will normally ...

    Started by Anathema‎, 08-31-2012 02:14 AM
    • Replies: 0
    • Views: 2,461
    08-31-2012, 02:14 AM Go to last post
  42. Which statistical analysis should be used?

    Hello everyone I have seven localities from which I collected different species of plants (small number of species aout 30) I want to include some...

    Started by Anawi‎, 12-15-2014 12:02 PM
    • Replies: 4
    • Views: 1,962
    12-29-2014, 10:18 AM Go to last post
  43. Please, need some help

    Dear people, I need some help regarding the following. Hopefully someone can help!! I'm looking at the effect of student employment on grades....

    Started by Anbrhave‎, 11-25-2010 04:32 AM
    • Replies: 0
    • Views: 1,813
    11-25-2010, 04:32 AM Go to last post
  44. generating variables

    I have a variable in the SHARE dataset which is like this: EX026_ TRUST IN OTHER PEOPLE 'Finally' at the beginning of the question text removed. I...

    Started by Anca‎, 03-04-2013 08:22 AM
    • Replies: 0
    • Views: 879
    03-04-2013, 08:22 AM Go to last post
  45. Unhappy Question on Normal distributions and sampling distributions

    I have the following questions for homework and seem to have hit a roadblock..any help would be apprecieated. 1. A recent statistics exam had a...

    Started by ancorsi‎, 04-10-2009 03:52 PM
    • Replies: 0
    • Views: 4,835
    04-10-2009, 03:52 PM Go to last post
  46. Reasons and advantages of using an ANCOVA instead of a Regression

    Hello everyone, Just wondering if any of you could help me. Just wondering when the variables Iím using can be used for both ANCOVA and...

    Started by ANCOVA'D‎, 06-08-2016 08:59 AM
    ancova, regression
    • Replies: 1
    • Views: 1,880
    06-08-2016, 02:46 PM Go to last post
  47. Survey Analysis-Test for significance?

    Hello, This is my first post to the forum so I hope i am in the appropriate category. I am analyzing satisfaction data for my organization. I...

    Started by andersa2‎, 06-07-2010 01:29 PM
    • Replies: 2
    • Views: 4,383
    06-12-2010, 12:04 AM Go to last post
  48. Largest Number within the lowest 90% of a group of Numbers

    How would you go about writing a formula (ideally in excel, access, vba code, etc) that would return the largest number within the lowest 90% of a...

    Started by andfrie1‎, 02-20-2014 05:05 PM
    • Replies: 4
    • Views: 1,267
    02-21-2014, 09:31 AM Go to last post
  49. Minimum Detectable Difference for Two-Sample t-Test for Means

    Dear all, I was looking for a method for posthoc calculation of the minimum detectable difference for Two-Sample t-Test and I came across this...

    Started by andhou‎, 01-15-2015 06:00 AM
    • Replies: 0
    • Views: 3,103
    01-15-2015, 06:00 AM Go to last post
  50. Statistics Help

    My question may be very simple but here it is, Find the value of z such that the area under the standard normal curve in teh left tail is 0.05. ...

    Started by Andie36‎, 10-21-2008 11:50 AM
    • Replies: 3
    • Views: 3,829
    10-21-2008, 12:12 PM Go to last post
  51. Stndrd Norm Distrib

    For a standardized normal distribution, calculate the following probabilities: a. P(z<1.5) b. P(z_> 0.85) c. P(-1.28< z <1.75) Aren't I missing...

    Started by Andie36‎, 10-23-2008 10:51 AM
    • Replies: 3
    • Views: 2,922
    10-23-2008, 11:30 AM Go to last post
  52. Normal distribution - do it need to test that for Kendall's W

    Hello guys, i have a quick question, i am currently conducting my master thesis and am ranking some barriers according to their mean and median...

    Started by andih‎, 07-29-2013 04:05 AM
    • Replies: 0
    • Views: 1,194
    07-29-2013, 04:05 AM Go to last post
  53. Factor analysis (pcf) and linear regression

    Der all, I've got a general question on factor analysis using principle-component-factors in Stata in order to check for the validity of the...

    Started by andik‎, 02-12-2015 03:07 AM
    • Replies: 5
    • Views: 1,726
    02-12-2015, 09:10 AM Go to last post
  54. chi-square test with very uneven binary variable and an ordered variable

    Hello everyone, this is probably a quite simple question, yet I would like to ask it here. I want to run a chi-square test between one binary coded...

    Started by andik‎, 11-24-2015 11:28 PM
    • Replies: 3
    • Views: 1,174
    11-26-2015, 03:35 AM Go to last post
  55. Exclamation Box-Cox-Model: How to get p-Values?

    :wave: Hello everybody, Does anybody know how to get p<chi2-values for each of the independent variables when running a box-cox model in...

    Started by andony‎, 08-31-2008 03:06 PM
    • Replies: 0
    • Views: 2,070
    08-31-2008, 03:06 PM Go to last post
  56. Reduce dummy variables to scores reflecting underlying dimensions

    I'm having a set of 34 dummy variables for a little more than 100 obs. I would now like to know what would be an appropriate technique to find out ...

    Started by andony‎, 06-08-2010 05:13 AM
    • Replies: 5
    • Views: 5,582
    06-21-2010, 10:11 AM Go to last post
  57. Annotation of bootstrapping

    Hi all, I've been asked by reviewers to make the methods section of a paper more formal. The method in short is bootstrapping a probability...

    Started by Andorin‎, 12-27-2015 04:44 PM
    • Replies: 2
    • Views: 1,525
    12-27-2015, 05:48 PM Go to last post
  58. Wilcoxon signed-rank test - Can I use for this case?

    Hello guys, I'm trying test if the results of a measurement variable (obtained with observation) is significantly greater than a other (obtained...

    Started by Andre‎, 02-27-2012 04:41 AM
    observation, random, wilcoxon signed-rank test
    • Replies: 0
    • Views: 1,760
    02-27-2012, 04:41 AM Go to last post
  59. Paired t on large data set

    This is my first of hopefully many posts. Statistics is not one of my strong points :) I have a question. Below is the output from a paired t-test...

    Started by Andre Smit‎, 12-19-2008 11:27 AM
    • Replies: 7
    • Views: 5,356
    12-31-2008, 11:31 AM Go to last post
  60. ANOVA vs Regression?

    Attached with this post is a comma delimited file I used to run some stats analysis. I am interested in the significance and influence of 3...

    Started by Andre Smit‎, 08-03-2009 12:16 PM
    • Replies: 5
    • Views: 6,880
    08-05-2009, 10:29 PM Go to last post

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