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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: 66,873
    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: 197,002
    07-16-2014, 11:01 AM Go to last post
  1. Difference between the population and sample

    I have a general understanding of the difference between a population (set of entities under study) and a sample (a subsection selected from the...

    Started by amathew‎, 05-13-2011 03:27 PM
    • Replies: 1
    • Views: 2,642
    05-13-2011, 05:27 PM Go to last post
  2. Normality Tests

    I'm trying to follow the below link to test the effectiveness of two ads....

    Started by amathew‎, 05-15-2011 09:56 PM
    • Replies: 4
    • Views: 2,164
    05-16-2011, 10:14 AM Go to last post
  3. Basic Question about Weight Average

    This is a pretty simple question and I'm wondering how to go about finding a solution. I have the following data. ttt =...

    Started by amathew‎, 05-08-2013 10:20 AM
    • Replies: 0
    • Views: 895
    05-08-2013, 10:20 AM Go to last post
  4. Probability Question

    Urn 1 has 2 white balls and 4 red balls. Urn 2 has 2 white balls and 1 red ball. a ball is then randomly picked from urn 1 and placed into urn 2...

    Started by amavadia‎, 05-11-2007 06:38 PM
    • Replies: 2
    • Views: 2,459
    05-14-2007, 03:24 AM Go to last post
  5. mean time for an random event to occur?

    I'm trying to estimate how much margin I must build into a design. The design is very simple: I have a voltage applied to the input of a comparator....

    Started by AmazinglySmooth‎, 09-16-2009 08:56 AM
    • Replies: 0
    • Views: 1,756
    09-16-2009, 08:56 AM Go to last post
  6. STATA - Finance - Portfolio Volatility

    Please refer to the Statistical Package section for this post

    Started by amazon‎, 12-02-2014 03:45 AM
    econometrics, finance, portfolio, stata, volatility
    • Replies: 0
    • Views: 1,222
    12-02-2014, 03:45 AM Go to last post
  7. Help with analysis of statistical data

    Hi, I'm new to this forum, the reason I chose to sing up was because I'm currently in the middle of solving a statistical assignment for my...

    Started by Ambeon‎, 05-03-2010 01:24 PM
    • Replies: 0
    • Views: 2,363
    05-03-2010, 01:24 PM Go to last post
  8. Question about Mantel Test results

    Hello, I have two matrices that I would like to join together for analysis -providing they are similar "enough". My Mantel test stat result was...

    Started by amber33‎, 08-27-2008 10:08 PM
    • Replies: 0
    • Views: 2,892
    08-27-2008, 10:08 PM Go to last post
  9. help please: issues with test selection and interpretation of results

    Hello I've got what is hopefully a simple problem which I would really appreciate some guidance and advice on: my data is in the form of...

    Started by amber33‎, 01-28-2009 09:21 PM
    • Replies: 14
    • Views: 6,059
    02-04-2009, 01:14 AM Go to last post
  10. Confounding vs. Extraneous Variables?

    I need to know the difference between these two in a psychological research paper I am studying, in which there are two levels of independent...

    Started by amberlowings‎, 04-01-2014 05:02 AM
    confounding variable, extraneous variable, psychology
    • Replies: 3
    • Views: 2,544
    04-01-2014, 03:09 PM Go to last post
  11. Help determining normality test...low N and uneven sample size

    Hi all, I am trying to do some statistics on juvenile coral growth rates from a 4 year study. I am looking to answer how growth rates differ from...

    Started by ambermlittle‎, 04-27-2010 10:04 AM
    • Replies: 1
    • Views: 3,758
    04-27-2010, 11:13 AM Go to last post
  12. Unweighted and Weighted Data (Chi Square)

    Here's my situation: I have a dataset with unweighted data taken from a small, annual survey. I also have a large dataset with weighted and...

    Started by ambermrichardson‎, 01-19-2007 08:38 AM
    • Replies: 0
    • Views: 7,207
    01-19-2007, 08:38 AM Go to last post
  13. Unhappy Which analysis do i need for this type of likert-scale questions?

    Hi! I have two questions in my questionnare which has already been applied to 507 people. The questions are like this: There are the factors which...

    Started by ambrossia‎, 06-07-2009 05:55 AM
    • Replies: 0
    • Views: 3,064
    06-07-2009, 05:55 AM Go to last post
  14. Interpreting sensitivity and specificity with corresponding PPV and NPV

    Hello, I have calculated sensitivities, specificities with pos and neg predictive values for different cutoff values of two biomarkers. What i...

    Started by amb_e‎, 08-15-2013 09:26 AM
    negative, positive, predictive value, sensitivity, specificity
    • Replies: 9
    • Views: 3,531
    08-15-2013, 02:43 PM Go to last post
  15. Red face Hypothesis Testing of Plant Height

    Hello, I'm trying to figure out how to do hypothesis testing, working only from class notes, and the following example I just cannot follow. " We...

    Started by amcca064‎, 12-10-2007 04:23 PM
    • Replies: 1
    • Views: 3,790
    12-12-2007, 12:00 AM Go to last post
  16. Analysis advice.

    I am working on project that is comparing two types of corn and their crop yield. For each corn variety they were planted in various soil types and...

    Started by amcclur‎, 03-23-2014 10:49 AM
    • Replies: 1
    • Views: 1,207
    03-23-2014, 04:08 PM Go to last post
  17. Effective sample size

    Hi, I'm trying to work on a survey dataset, and am unsure whether I should be using the effective sample size, or the actual sample size as a...

    Started by AME1982‎, 03-23-2010 11:07 AM
    • Replies: 0
    • Views: 2,614
    03-23-2010, 11:07 AM Go to last post
  18. Coefficient of variation

    I have some yearly time series data (20 years) on the level of income for a variety of institutions, and want to assess whether the level of...

    Started by AME1982‎, 12-06-2010 12:58 PM
    • Replies: 0
    • Views: 3,375
    12-06-2010, 12:58 PM Go to last post
  19. Test to compare email open rates

    Hi, I am trying to measure an email campaign and I have the open rates of emails from various segments of customers (there are about 10 segments...

    Started by ame2005‎, 11-02-2014 06:23 PM
    campaign, email, open rate, test data
    • Replies: 3
    • Views: 1,939
    11-07-2014, 02:39 AM Go to last post
  20. Logistic regression cutoff at 0.3

    Hi, I have built a logistic regression model with misclassification rate around 18%. When I look at the ROC curve(area under the curve is 0.76)...

    Started by ame2005‎, 11-22-2014 03:56 PM
    event, logistic, probability cutoff
    • Replies: 3
    • Views: 1,381
    11-23-2014, 07:12 AM Go to last post
  21. LInear discriminant analysis

    I have been reading up on LDA and I found the following on Wikipedia Homogeneity of variance/covariance (homoscedasticity): Variances among...

    Started by ame2005‎, 11-26-2014 11:08 PM
    • Replies: 0
    • Views: 1,382
    11-26-2014, 11:08 PM Go to last post
  22. Cool Any One Can Tell Me Desirable Properties of Interval Estimation ?????

    Dear All of you i need your help i need help about this "Desirable Properties of Interval Estimation "

    Started by ameeq7746‎, 03-05-2013 11:49 AM
    • Replies: 8
    • Views: 1,434
    11-21-2013, 11:48 AM Go to last post
  23. Wink Intresting In Statistics

    Hi , I hope you all of you fine if any wanna intrested or want to work together, or publishing the paper he can contact with me, I will help all of...

    Started by ameeq7746‎, 06-27-2013 12:39 PM
    • Replies: 0
    • Views: 1,179
    06-27-2013, 12:39 PM Go to last post
  24. Need Help

    Any one can help me on this topic i need help on "Ethical hacking and networking and their role in statistics"

    Started by ameeq7746‎, 01-30-2014 07:52 AM
    • Replies: 1
    • Views: 932
    01-30-2014, 07:53 AM Go to last post
  25. Efficiency of an estimator (truncated Poisson)

    Hello, I wonder if anyone could help me with this problem. I have been asked to answer Exercise 2.23 of this book; ...

    Started by Amelia‎, 10-26-2009 04:04 AM
    • Replies: 0
    • Views: 2,349
    10-26-2009, 04:04 AM Go to last post
  26. is there another solution? this one is not intuitive.

    Here is the problem and the solution. I understand them both but, the solution is not intuitive. Is there another way to work it out? problem: ...

    Started by Amer‎, 03-31-2011 11:08 AM
    discrete probability, practice problem
    • Replies: 5
    • Views: 4,765
    03-31-2011, 02:18 PM Go to last post
  27. Question High Correlations with Very Different Distributions..?

    Sorry about the post in wrong section...

    Started by american_rob‎, 07-08-2008 09:20 AM
    • Replies: 0
    • Views: 1,963
    07-08-2008, 09:20 AM Go to last post
  28. Descriptive Statistics

    There's information about a variety of descriptive statistics, such as measures of location, measures of variability, and measures that will help you...

    Started by amet426‎, 02-04-2012 07:04 PM
    • Replies: 3
    • Views: 2,696
    02-04-2012, 08:28 PM Go to last post
  29. Question Calculating Z- Scores.. Anyone??

    Ok, I know how to get to the Z score using the standard deviation and the mean. However I am not sure how to figure a out a problem in regards to...

    Started by AMG1982‎, 07-12-2009 01:36 PM
    • Replies: 1
    • Views: 3,354
    07-12-2009, 08:53 PM Go to last post
  30. Confidence Intervals

    Hello All, I am having a bit of trouble figuring out what equations to use when asked to find a particular percentage for a confidence interval...

    Started by AMG1982‎, 07-22-2009 02:05 PM
    • Replies: 0
    • Views: 2,848
    07-22-2009, 02:05 PM Go to last post
  31. Calculate the exact P-Value for an F-Test by hand

    Does anyone know the algorithm, formula, or procedure to calculate the exact p-value for an F-test by hand? I already know how to find out what...

    Started by AMGGWB‎, 09-07-2011 09:01 PM
    p-value for f-test
    • Replies: 2
    • Views: 27,139
    09-07-2011, 09:38 PM Go to last post
  32. Mixed model

    Hello there! I have a question concerning my data and the use of Mixed models in SPSS 21.0. I want to investigate the influence of the...

    Started by amgistel‎, 05-21-2017 03:53 AM
    • Replies: 0
    • Views: 755
    05-21-2017, 03:53 AM Go to last post
  33. Question about which test to use

    Hi there everyone, I apologize if this is in the wrong section. It is not technically coursework but is elementary (I think) so I put it here! ...

    Started by amichel‎, 12-08-2015 12:42 AM
    • Replies: 1
    • Views: 1,370
    12-08-2015, 02:59 AM Go to last post
  34. Sampling Distribution

    Hi Guys, I hope you can help me out to figure what I am doing wrong... I have the answer to the exercise and I don't get how I find something...

    Started by Aminalek‎, 08-20-2017 05:53 AM
    • Replies: 0
    • Views: 202
    08-20-2017, 05:53 AM Go to last post
  35. ANOVA/ANCOVA/Regression

    question : The linkage between "self learning" and "work efficiency" differs between women and men can be determined by : a. two-way ANOVA....

    Started by amir‎, 02-07-2009 04:38 AM
    • Replies: 6
    • Views: 3,382
    02-08-2009, 10:24 AM Go to last post
  36. 4 sets of true/false data

    I just need a hint .. I have 19 subjects, and I have performed 4 types of examinations on each of them - trying to measure the same parameter...

    Started by amir.z‎, 02-21-2009 02:33 PM
    • Replies: 1
    • Views: 1,527
    02-26-2009, 03:13 AM Go to last post
  37. lot quality assurance sampling

    Why in lot quality assurance sampling, means are compared, when in fact we are getting proportions as immunization coverage etc.?

    Started by amirkm‎, 07-28-2011 10:23 AM
    lot quality
    • Replies: 0
    • Views: 1,705
    07-28-2011, 10:23 AM Go to last post
  38. Post How can I compare regression coefficients in a same multivariate regression mode

    Hi, I think this question has been answered in bits and pieces here and there, but I am still a bit unsure about what the best approach for this is:...

    Started by amirpakpour‎, 02-27-2014 08:34 AM
    compare coefficients
    • Replies: 3
    • Views: 1,993
    02-27-2014, 11:45 AM Go to last post
  39. Statistical Study Help

    Hi, would someone mind reading this study and explaining the statistics used and some of the graphs and charts? I'm only in an introductory...

    Started by amishrifle‎, 06-03-2014 07:07 PM
    design, statistics, study
    • Replies: 0
    • Views: 1,279
    06-03-2014, 07:07 PM Go to last post
  40. Logistic Regression

    Could someone explain the basics of logistic regression? Thank you!

    Started by amishrifle‎, 06-04-2014 05:32 PM
    logistic, regression
    • Replies: 12
    • Views: 3,119
    06-06-2014, 05:01 AM Go to last post
  41. calulating a sample size for a PhD project

    Hello all, And thank you for viewing my post, I have begun developing my PhD proposal and become unstuck on sample size calulations. this is what...

    Started by amiz‎, 01-26-2013 09:17 AM
    samplesize
    • Replies: 5
    • Views: 3,039
    01-29-2013, 03:02 PM Go to last post
  42. Z score

    I am having difficulty understanding the Z score. Its looks like that SD and Z score is doing the same function? Could you please explain with small...

    Started by Amjad‎, 01-25-2006 01:18 PM
    • Replies: 2
    • Views: 4,204
    01-25-2006, 05:41 PM Go to last post
  43. Question New Student need help

    Hi, I am a new student in statistics and any help will really appriciate. I am doing my assignment and one of the question was about level of...

    Started by Amjad‎, 01-24-2006 10:02 PM
    • Replies: 2
    • Views: 3,121
    01-25-2006, 11:12 AM Go to last post
  44. Variability

    Hi, I have a question for my home work about finding the 3 measure sof vairability for the variable that is given to us.but i am little confuse...

    Started by Amjad‎, 01-31-2006 03:56 PM
    • Replies: 2
    • Views: 3,923
    02-01-2006, 10:49 AM Go to last post
  45. Question level of meausrement

    Hi , I am woundering if you can tell me if I am corect in understanding the levelof mesuremnet? The following data's level of measurement is...

    Started by Amjad‎, 02-13-2006 01:57 PM
    • Replies: 2
    • Views: 3,091
    02-13-2006, 03:53 PM Go to last post
  46. level of measurement

    Hi John, just to confirm if the following is the ratio measurement. I belive its ratio because the zero is the actual possibility, when there is no...

    Started by Amjad‎, 02-23-2006 11:15 AM
    • Replies: 4
    • Views: 7,906
    02-23-2006, 01:53 PM Go to last post
  47. Lightbulb level of measurement.

    Hi john, I am real confuse when I see zero in the data, in the following I am thinking,:confused: is ordinal but when I see the zero it seems it...

    Started by Amjad‎, 03-23-2006 02:27 PM
    • Replies: 2
    • Views: 2,650
    03-24-2006, 10:56 AM Go to last post
  48. Calculating Sample Size - Determining Sampling Plan

    Hi All, I need some help to determine the best method to go about setting up a sampling plan of some sort. Here is the situation... our business...

    Started by ammosman‎, 03-10-2015 08:00 AM
    • Replies: 2
    • Views: 1,373
    03-10-2015, 08:23 AM Go to last post
  49. help need

    AOA respected sir kindly guide me in this artical which link is given below, how auther has been drived instability index value in table no. 4 with...

    Started by amna_wish34@y.com‎, 01-03-2011 07:52 AM
    • Replies: 0
    • Views: 1,719
    01-03-2011, 07:52 AM Go to last post
  50. Correlation of dependent variables

    Hello! I've been googling all night without finding what I'm looking for, so now I post here hoping that someone can point me in the right...

    Started by amorner‎, 01-31-2011 07:03 PM
    • Replies: 5
    • Views: 6,016
    02-01-2011, 08:39 PM Go to last post
  51. McNemar test: are my reviewers bone-headed or have I misunderstood?

    Hi all, I would very much appreciate any comments on an analysis I have conducted. I think it's a straightfoward issue, but several reviewers of...

    Started by amorphia‎, 10-06-2009 09:16 AM
    • Replies: 1
    • Views: 2,491
    10-06-2009, 01:39 PM Go to last post
  52. Question Pool data from individuals in sign test or Fisher's exact test - valid or pseudorep?

    Hi all! My intuition is telling me a particular approach is valid even though is appears to go against the principle of not pooling multiple data...

    Started by amorphia‎, 03-13-2012 06:40 AM
    • Replies: 10
    • Views: 2,893
    03-16-2012, 04:52 AM Go to last post
  53. nonlinear least square vs. maximum likelihood

    I am trying to fit spawner recruit data to typical recruitment models (e.g. Beverton holt, Ricker), can this be done with nonlinear least squares, or...

    Started by amosbobamos‎, 03-16-2011 02:05 PM
    • Replies: 0
    • Views: 2,514
    03-16-2011, 02:05 PM Go to last post
  54. Comparing percentages

    I'm having trouble wrapping my head around some of this. I need to determine whether or not there is a statistical difference between two...

    Started by amperes‎, 03-28-2011 11:33 PM
    • Replies: 10
    • Views: 33,090
    10-11-2011, 03:31 PM Go to last post
  55. standardizing a small sample?

    I'm looking to compare a sample A (n=33) to a smaller sample B (n=18). In both of these samples, several different measurements and counts were...

    Started by amperes‎, 04-26-2011 11:48 PM
    standardizing sample
    • Replies: 0
    • Views: 1,749
    04-26-2011, 11:48 PM Go to last post
  56. small sample size n=18

    I have two samples and I was wondering if there is a way to standardize the calculations in my smaller sample so that the calculations in both...

    Started by amperes‎, 04-28-2011 04:45 PM
    • Replies: 6
    • Views: 4,205
    04-30-2011, 07:21 PM Go to last post
  57. Questions about KL divergence

    Hi all, I am comparing two distributions with KL divergence which returns me a non-standardized number that, according to what I read about this...

    Started by ampleforth‎, 07-29-2010 09:19 PM
    • Replies: 1
    • Views: 3,283
    08-03-2010, 04:48 PM Go to last post
  58. Publications that use/report KL divergence

    Who can point me to papers and publications that used KL divergence and report it in the paper in some direct form. I would like to read how it is...

    Started by ampleforth‎, 07-29-2010 09:21 PM
    • Replies: 0
    • Views: 2,746
    07-29-2010, 09:21 PM Go to last post
  59. Methods for distributional

    The question in short: What methods can be used to quantify distributional relationships between data when the distribution is un-known? Now the...

    Started by ampleforth‎, 08-03-2010 04:58 PM
    • Replies: 0
    • Views: 2,300
    08-03-2010, 04:58 PM Go to last post
  60. Lorenz curve = QQ plot ?

    Are Lorenz curves and QQ plots the same? If not, where are the differences? I read about both of them and they appear to be two terms for the same...

    Started by ampleforth‎, 09-19-2010 03:27 AM
    • Replies: 1
    • Views: 3,921
    09-22-2010, 12:50 PM Go to last post

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