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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: 197,114
    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: 66,931
    09-30-2005, 09:44 AM Go to last post
  1. Help please, maximizing function w/respect to one x variable

    OK, so I'm working on this hw assignment (I'm a grad student, and for this class this is for knowledge, not points). We were given a large data set...

    Started by BWells‎, 02-23-2013 09:45 PM
    homework, maximize, optimal, regression, stata
    • Replies: 2
    • Views: 2,391
    02-24-2013, 11:57 AM Go to last post
  2. Problems with choice of test(s): GLM, ANOVA, correlation

    Hello all Before I begin, let me say that I am sorry if this post is in the wrong section. Also, I'm sorry if this question is stupid. I am not a...

    Started by TiiTii‎, 02-24-2013 07:57 AM
    • Replies: 0
    • Views: 1,800
    02-24-2013, 07:57 AM Go to last post
  3. Main effects but no correlation..?

    Hi all, I run a two way analysis of variance and got significant main effects of type of stimulus (2 levels) and group (3 levels) but no...

    Started by melissa88‎, 02-23-2013 07:26 AM
    • Replies: 2
    • Views: 2,385
    02-24-2013, 07:37 AM Go to last post
  4. Which test for comparing before/after and control groups?

    Not sure which hypothesis tests would be best in these three scenarios: 1. Compare Before & After Scores Students take a course, with a pre-test...

    Started by dhundsness‎, 02-24-2013 03:22 AM
    hypothesis testing
    • Replies: 0
    • Views: 1,370
    02-24-2013, 03:22 AM Go to last post
  5. Multiple Regression instead of a Median Split?

    Hi, guys, I'm new here and I need some help with a report I'm writing. Some background: I'm a Psychology student and only have basic knowledge of...

    Started by Nimlot‎, 02-23-2013 07:32 PM
    • Replies: 0
    • Views: 2,742
    02-23-2013, 07:32 PM Go to last post
  6. paired samples t-test vs. repeated measures (controlling for a variable) on SPSS

    I just dont get my head around this.. I used paired samples t-test to compare high anxious subjects' memory for variable A and variable B. There was...

    Started by melissa88‎, 02-23-2013 11:18 AM
    • Replies: 1
    • Views: 2,369
    02-23-2013, 02:59 PM Go to last post
  7. confidence interval for mean difference

    hello I need to calculate an CI for a mean difference. In the attached picture you can see the sample size, sample mean and sample SD from both...

    Started by Yankel‎, 02-23-2013 05:16 AM
    • Replies: 5
    • Views: 1,625
    02-23-2013, 01:34 PM Go to last post
  8. Statistical Test

    Hello, I have 4 sets of data, 2 sets from one individual and 2 from another. I have calculated the % difference between the two sets for each...

    Started by Alex95‎, 02-23-2013 08:58 AM
    • Replies: 2
    • Views: 1,532
    02-23-2013, 10:29 AM Go to last post
  9. Data will not normalize & need to run ANOVA

    Hello, I have a set of data that I need to run a 2-way ANOVA on. My data is very highly skewed to the right, so it does not follow a normal...

    Started by Lizzbee‎, 02-22-2013 05:31 PM
    anova, minitab, normality, sigmaplot, transformations
    • Replies: 6
    • Views: 9,239
    02-22-2013, 06:55 PM Go to last post
  10. What test to use? Correlation/regression VS ANOVA

    Hey all, I am working on my final year dissertation and could use some help because I have a very shallow understanding of statistics. I...

    Started by melissa88‎, 02-22-2013 04:52 PM
    • Replies: 5
    • Views: 3,199
    02-22-2013, 06:10 PM Go to last post
  11. Post Absolute beginner needs help deciphering question

    Hi there. I am an absolute novice to statistics, and have had no formal education in it since year 9 at school when we did box-plot diagrams. I...

    Started by Mortson‎, 02-22-2013 02:05 PM
    • Replies: 7
    • Views: 1,493
    02-22-2013, 06:06 PM Go to last post
  12. measures of variation

    Three classes of math students took a test and received the following scores Class I Class II Class III X=72 ...

    Started by tdking‎, 02-22-2013 02:03 PM
    • Replies: 3
    • Views: 1,830
    02-22-2013, 05:43 PM Go to last post
  13. Pearson Chi Square test on Extremely large sample size

    Hi guys I am new to this forum. I am working with Pearson Chi-square statistics when I run into a problem. I have a sample size of 89000 and I...

    Started by kyletan‎, 02-22-2013 01:31 PM
    large sample size, pearson chi square test
    • Replies: 4
    • Views: 11,836
    02-22-2013, 04:03 PM Go to last post
  14. Smile measures of variation

    An instructor compared two teaching techniques to see which was most successful in reaching the students. Results of the experimental and control...

    Started by tdking‎, 02-22-2013 02:07 PM
    • Replies: 7
    • Views: 1,573
    02-22-2013, 03:22 PM Go to last post
  15. Question Uniform most powerful test

    Hi all, I am new here :wave: I got a question listed below. Thanks for your generous help. Let X1;...;Xn be a random sample from the uniform...

    Started by macangyed‎, 02-22-2013 10:26 AM
    • Replies: 4
    • Views: 2,631
    02-22-2013, 11:20 AM Go to last post
  16. Hosmer Lemeshow goodness of fit test - grouping

    Hello, I need to perform Hosmer-Lemeshow test for logistic regression, but I'm not sure how to group data (continuous variable - interval 0-1). ...

    Started by julo‎, 02-22-2013 09:13 AM
    grouping, hosmer, lemeshow
    • Replies: 0
    • Views: 879
    02-22-2013, 09:13 AM Go to last post
  17. Finding the p-value for two samples which are not normally distributed.

    Hello, I am doing medical research and I have gathered data for two groups of patients with different characteristics. The data for each of the...

    Started by uwold‎, 02-20-2013 04:40 PM
    p-value
    • Replies: 8
    • Views: 2,542
    02-21-2013, 10:01 PM Go to last post
  18. sketching distribution

    I am taking a tutorial online and I ran into a quiz but I am totally new to stats..could someone help with the question below? Thank you very much in...

    Started by mazatlan‎, 02-21-2013 11:13 AM
    • Replies: 8
    • Views: 1,955
    02-21-2013, 12:40 PM Go to last post
  19. two contingency table

    When i use chi square , odds ratio and difference of proportion got similar findings. Which may be the best statistic for this type of research...

    Started by sd215‎, 02-21-2013 12:32 PM
    categorical data
    • Replies: 0
    • Views: 1,014
    02-21-2013, 12:32 PM Go to last post
  20. Using the McNemer test

    Hi all. I hope this is the right forum to ask this question. Anyway, I need to compare the results of 2 questions that each of the participents...

    Started by Shachar‎, 02-21-2013 08:53 AM
    • Replies: 4
    • Views: 1,383
    02-21-2013, 11:34 AM Go to last post
  21. Xbart Chart-Missing Data(correct sum) Question

    Good Morning, I'm in a business statistics course and I understand how to make a xbar and rchart in excel when all the data is available to me,...

    Started by nmg82‎, 02-21-2013 09:32 AM
    business statistic, control chart, missing data
    • Replies: 0
    • Views: 1,503
    02-21-2013, 09:32 AM Go to last post
  22. Correlation between radiological sign and clinical symptom: choosing the test

    Greetings, I'm new to the forum and very rusty on statistics. I'm studying to learn enough autonomy, but I really can use some of your kind help :) ...

    Started by Juzaam‎, 02-21-2013 06:39 AM
    biostatistics, incidental finding, medicine, radiology
    • Replies: 0
    • Views: 1,010
    02-21-2013, 06:39 AM Go to last post
  23. Maximum likelihood estimate two uniform distribution

    X ~ (Uniform , with probability 1/2 , (Uniform , with probability 1/2 ; (theta > 0). The following sample is taken from the distribution...

    Started by Manisha Brahmachary‎, 02-20-2013 09:47 PM
    • Replies: 1
    • Views: 3,447
    02-21-2013, 03:53 AM Go to last post
  24. Average

    Hi... I have an average rainfall,minimum and maximum temperature data.so can I find average value of this three variable?Is it meaningful? ...

    Started by Poonam‎, 02-20-2013 03:42 AM
    2 Pages
    1 2
    • Replies: 18
    • Views: 3,131
    02-21-2013, 02:25 AM Go to last post
  25. What statistical test do I need to use? PLEASE HELP!!

    Hey guys, could use a little bit of help. I haven't taken a stats course since college (5 years ago). I am a little bit rusty. My boss wants me to...

    Started by satobc757‎, 02-20-2013 03:30 PM
    • Replies: 4
    • Views: 1,383
    02-21-2013, 02:18 AM Go to last post
  26. Simulating and Estimating from Time Series

    What is the best Rpackage to fit a time series?

    Started by lord12‎, 02-20-2013 06:48 PM
    • Replies: 2
    • Views: 1,215
    02-20-2013, 07:33 PM Go to last post
  27. Testing for the effect of a categorical variable in general linear regression

    Hi, Hope someone can help? I have a data set which I have used to derive prediction equations for intramuscular fat (IMF) in the muscle of an animal...

    Started by neilc‎, 02-20-2013 04:04 PM
    • Replies: 1
    • Views: 1,353
    02-20-2013, 05:36 PM Go to last post
  28. ROC curve or other

    I am trying to help prepare something for FDA. It involves 2-dimensional Western blots. The result is that for a particular condition, one has two...

    Started by STATbio‎, 02-20-2013 03:34 PM
    • Replies: 1
    • Views: 1,162
    02-20-2013, 04:16 PM Go to last post
  29. Cluster analysis - longitudinal variation in results?

    Hi, I'm wondering if there are any feasible ways in which to look at longitudinal data using cluster analysis. I've got four years worth of data...

    Started by cls1‎, 02-19-2013 07:22 AM
    • Replies: 3
    • Views: 1,892
    02-20-2013, 11:24 AM Go to last post
  30. probit vs. logit regression

    What is the difference between PROBIT and LOGIT regression? How can this difference change the description of analysis results?

    Started by yulia‎, 02-19-2013 03:22 PM
    • Replies: 10
    • Views: 6,675
    02-19-2013, 08:36 PM Go to last post
  31. Width of CI comparison, Slutsky vs. Approximation

    Hello, I am working on a problem right now where I am trying to prove the following: for any 0 < p < 1 , P(W_{n} \le V_{n}) goes to 1 as n...

    Started by GTaiko‎, 02-19-2013 01:04 AM
    • Replies: 4
    • Views: 1,687
    02-19-2013, 07:32 PM Go to last post
  32. Integration problem once more

    I'm working with an apARCH model and need to find a percentile for r_t+2. In order to make presentation of the problem simpler I use an ARCH...

    Started by JesperHP‎, 02-17-2013 05:42 PM
    • Replies: 1
    • Views: 2,575
    02-19-2013, 05:59 PM Go to last post
  33. Best fit, standard deviation, and R2

    Hi, I am wondering if someone can help me with a fairly basic question. I am looking at whether power, linear, or exponential curves fit a set of...

    Started by Rockprincess‎, 02-19-2013 02:17 PM
    • Replies: 3
    • Views: 27,135
    02-19-2013, 03:11 PM Go to last post
  34. Best guess for the next value from a set of fairly random values

    Hello there, I've been searching the forum trying to find a discussion on this topic, and the only thread I've found is this one, which ended...

    Started by jeromakay‎, 02-19-2013 01:30 PM
    • Replies: 2
    • Views: 3,135
    02-19-2013, 02:04 PM Go to last post
  35. What type of ANOVA/model to use for hypothesis test?

    I am trying to work out the most appropriate way to analyse some data from an experiment and would be really grateful for any ideas. The experiment...

    Started by PhD‎, 02-18-2013 02:13 PM
    anova, hypothesis test, repeat observation, repeated measures anova, two way anova
    • Replies: 6
    • Views: 1,751
    02-19-2013, 12:54 PM Go to last post
  36. Statistical tests

    Hi. I have two groups with different dimensions to compare distributions. I need to do some statistical tests, like chi-square test, but with...

    Started by slavia‎, 02-19-2013 12:02 PM
    • Replies: 4
    • Views: 1,455
    02-19-2013, 12:51 PM Go to last post
  37. time series analysis

    I have several series (~30) of observations. Each of them consists of 500 values​​. Can I find in them the same effects by statistical analysis?...

    Started by vic_sido‎, 02-19-2013 12:27 PM
    • Replies: 1
    • Views: 1,274
    02-19-2013, 12:34 PM Go to last post
  38. which test (help)

    hi let's say that i want to measure a strength of a part of a body and i want to see if there is a side that is stronger. But i don't want to...

    Started by myyk‎, 02-18-2013 05:17 PM
    • Replies: 4
    • Views: 1,476
    02-19-2013, 02:47 AM Go to last post
  39. Which post hoc statisticcal analysis? (help)

    hi friends, I need an advice about the which analysis I should use. I made a MANCOVA and I have 3 groups one is for control group, the other two were...

    Started by ibrhmymn‎, 02-18-2013 01:06 PM
    • Replies: 6
    • Views: 1,886
    02-18-2013, 11:49 PM Go to last post
  40. law of expected value and variance question

    Hi guys, kinda new here and would really appreciate some help. i'm stuck on a problem related to the law of expected value and variance. ...

    Started by bling71‎, 02-18-2013 09:21 PM
    • Replies: 2
    • Views: 2,549
    02-18-2013, 09:42 PM Go to last post
  41. Question Regarding Poisson (I think)

    Hello, I have a question, whereby I already have the answer. What Im struggeling with is, where exactly these numbers were obtained, and was...

    Started by mikerichardson‎, 02-18-2013 02:02 AM
    • Replies: 4
    • Views: 1,560
    02-18-2013, 06:35 PM Go to last post
  42. Question regarding studentized range statistic

    I have been reading about it from http://www.vassarstats.net/textbook/ch14pt2.html. But now i am confuse how to calculate Qcv. Assume i have this...

    Started by x509‎, 02-18-2013 01:49 AM
    • Replies: 1
    • Views: 1,769
    02-18-2013, 05:21 PM Go to last post
  43. ROC Curve Help

    I have been reading about ROC curves...but I am still a little lost on how to apply them. What I am trying to do is specificity/sensitivity of...

    Started by STATbio‎, 02-18-2013 05:18 PM
    • Replies: 0
    • Views: 1,219
    02-18-2013, 05:18 PM Go to last post
  44. Method to analyse wind turbine data

    Dear All, I wish to find a method to analyse our wind turbine health montoring data flowing every minute. (126 parameters (power, speed,...

    Started by PRABHUCHAMY‎, 02-18-2013 06:55 AM
    • Replies: 2
    • Views: 1,565
    02-18-2013, 12:37 PM Go to last post
  45. Non-linearity and correlations

    I understand that Pearson's R is highly influenced by non-linear data. I am less clear if this is true with Spearman's Rho or in any case how serious...

    Started by noetsi‎, 02-18-2013 10:51 AM
    • Replies: 2
    • Views: 1,163
    02-18-2013, 12:00 PM Go to last post
  46. Can you index means?

    If I have a data set which has three sub groups, each of a different size and with a different mean can I index the means to adjust for the...

    Started by kingsolomonsgrave‎, 02-16-2013 06:33 PM
    • Replies: 2
    • Views: 1,648
    02-18-2013, 11:28 AM Go to last post
  47. Exclamation Statistics. Determining the mean.

    Hello! Can someone help me please with this exercise? The Kentucky Derby is held the first Saturday in May at Churchill Downs in Louisville,...

    Started by Lisa92‎, 02-17-2013 06:13 AM
    means
    • Replies: 1
    • Views: 5,566
    02-18-2013, 05:13 AM Go to last post
  48. Possible nested experimental design?

    Hi, I inherited a "nested experimental design" from a post doc and now have to defend my results for my undergrad thesis. My design is as...

    Started by MotherNature911‎, 02-18-2013 12:51 AM
    • Replies: 0
    • Views: 1,320
    02-18-2013, 12:51 AM Go to last post
  49. Question regarding T-Test

    would choosing a large/small nominal level for type-i error in t-test to while comparing 2 groups means ?

    Started by x509‎, 02-17-2013 07:40 PM
    • Replies: 3
    • Views: 1,761
    02-17-2013, 10:29 PM Go to last post
  50. Confidence Intervals for Pairwise Independant Normally Distributed Samples

    Good day, I have been thinking over this exercize for a couple of hours now and I have trouble finding a starting point. Suppose that X1,i iid∼...

    Started by stsman‎, 02-17-2013 08:58 AM
    confidence intervals, difference of means, normal distribution
    • Replies: 0
    • Views: 1,433
    02-17-2013, 08:58 AM Go to last post
  51. Mutually inclusive and collectively exhaustive

    I need 1- An event that is mutually inclusive but not collectively exhaustive 2-An event that is collectively exhaustive but not mutually...

    Started by Jimmy Conway‎, 02-17-2013 08:37 AM
    • Replies: 1
    • Views: 4,600
    02-17-2013, 08:46 AM Go to last post
  52. Coefficient of Determination

    Data Set Follows CARS X(Wight/Pound) Y(MPG) 1 3762 19 2 3988 18 3 ...

    Started by PSG‎, 02-16-2013 09:35 PM
    • Replies: 2
    • Views: 1,202
    02-17-2013, 01:02 AM Go to last post
  53. Talking Hi! im looking for which advance data analysis is actually helpful to real life.

    Hi! I really really need real life examples of how and which advance data analysis you personally can use to help in your life. so no basic stuff...

    Started by datana6521‎, 02-16-2013 02:34 AM
    2 Pages
    1 2
    • Replies: 22
    • Views: 4,249
    02-17-2013, 12:36 AM Go to last post
  54. Integration problem

    I have a problem regarding calculating some timeseries probabilities. I need to evaluate: \int \phi (\delta + a \epsilon^2_{T+2}, \alpha...

    Started by JesperHP‎, 02-16-2013 02:34 PM
    • Replies: 1
    • Views: 750
    02-16-2013, 08:29 PM Go to last post
  55. For satisfaction survey - How do I compare against "neutral"?

    I am wondering how to do statistical analysis for a survey conducted on likability and usability of an application. I used a Likert 7-point...

    Started by pinkswansays‎, 02-15-2013 11:35 AM
    • Replies: 4
    • Views: 1,772
    02-16-2013, 05:24 PM Go to last post
  56. Finding sum of mu(column)-mu

    The question: I started with constructed an ANOVA table and worked backwards to get a value for SSE = 900 since I was dumb and thought ...

    Started by APOCooter‎, 02-16-2013 01:38 PM
    • Replies: 0
    • Views: 1,722
    02-16-2013, 01:38 PM Go to last post
  57. Calculating the mean and variance of a sampling distribution two different ways

    Hello again! "Consider a population consisting of five values: 1, 2, 2, 4, and 6. Calculate the sampling distribution of the mean of a sample of...

    Started by S-C-3-1-3‎, 01-30-2013 03:04 AM
    • Replies: 4
    • Views: 2,870
    02-16-2013, 12:23 PM Go to last post
  58. Sample distribution of means and the minimum number of samples/population size

    Hi, Im having some issues with 2 things, and would appreciate it if someone could clear things up. (1) Ive read that the mean of "the sampling...

    Started by Hans Rudel‎, 02-07-2013 04:11 AM
    central limit theorem, population, population mean, population size
    • Replies: 1
    • Views: 2,387
    02-16-2013, 10:57 AM Go to last post
  59. Probability question

    Hello, After major efforts, I am just incapable of solving the 2 question attached (below). A prompt answer would be great! Thank you in...

    Started by lielle‎, 02-16-2013 09:29 AM
    bins, probability
    • Replies: 0
    • Views: 1,737
    02-16-2013, 09:29 AM Go to last post
  60. permutations and confidence intervals

    Hello! I am in need of a little guidance on a stat problem... I've performed a permutation on two data sets, in R, regarding sunblock efficacy,...

    Started by kweb313‎, 02-15-2013 10:14 PM
    confidence interval, homework, homework help, permutation
    • Replies: 0
    • Views: 1,372
    02-15-2013, 10:14 PM Go to last post

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