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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: 197,089
    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: 66,920
    09-30-2005, 09:44 AM Go to last post
  1. Hazard Function

    Q: Given the following Hazard Function: 2t^2, what is P. I recently had this on an exam and know that the Hazard Function is the PDF/Survival...

    Started by simplemts‎, 03-03-2013 06:40 PM
    • Replies: 4
    • Views: 1,859
    03-04-2013, 01:58 PM Go to last post
  2. MANOVA question regarding writing up main effects

    My professor had us run main effects of MANOVA in two different orders in order for us to understand the impact of ordering variables. In this...

    Started by ALT803‎, 03-04-2013 10:24 AM
    • Replies: 2
    • Views: 1,748
    03-04-2013, 01:23 PM Go to last post
  3. Simple F test question

    I have 3 data series A, B and C. How do I test whether the averages across A and B AND B and C etc. are jointly equal to one another using an F-test....

    Started by Vatsa‎, 03-04-2013 12:46 PM
    f test
    • Replies: 2
    • Views: 1,466
    03-04-2013, 01:12 PM Go to last post
  4. 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: 878
    03-04-2013, 08:22 AM Go to last post
  5. Sampling and Regression questions

    Q1 Often when trying to do statistically robust sampling we are not able to obtain a comprehensive list of all agents, and even in some cases when we...

    Started by metal.torpedo‎, 03-04-2013 01:07 AM
    • Replies: 0
    • Views: 1,365
    03-04-2013, 01:07 AM Go to last post
  6. Exclamation Urgent - Need help on these data

    Greetings. I have a set of data taken from the reliability test of a tool. The tool is tested on different materials. The failure parts of...

    Started by paperheart‎, 03-02-2013 12:00 PM
    • Replies: 3
    • Views: 1,493
    03-03-2013, 10:20 PM Go to last post
  7. Ambiguous problem on hypothesis testing, need help

    This is one of the questions in my homework: It is claimed that a car is driven on the average less than 20,000 kilometers per year. To test this...

    Started by mudum‎, 03-02-2013 10:37 PM
    • Replies: 2
    • Views: 1,947
    03-03-2013, 12:17 PM Go to last post
  8. Geometric trends linear estimation

    The following records are available for a parameter \Phi \begin{tabular}{|c|c|c|c|} \hline Year & $\Phi$ & Year & $\Phi$ \\ \hline 1989 &...

    Started by keyhs‎, 02-28-2013 07:55 AM
    • Replies: 7
    • Views: 1,564
    03-03-2013, 09:18 AM Go to last post
  9. Thumbs up Comparing a list of values or mean to a predetermined value

    Hello all, I've been trying to figure this out all day but I am struggling. :( I have a number of temperature readings over a period of 21...

    Started by crispy‎, 02-27-2013 06:02 PM
    • Replies: 9
    • Views: 1,675
    03-02-2013, 07:10 PM Go to last post
  10. Normal Approximation to the Binomial Distribution Help Needed

    A multiple choice test consists of a series of questions, each with four possible choices. a) If there are 60 questions, estimate the probability...

    Started by torchflame‎, 03-01-2013 08:16 PM
    binomial distribution, homework, homework help
    • Replies: 2
    • Views: 3,163
    03-01-2013, 08:29 PM Go to last post
  11. Question hiow to sett up this partial correlation

    Hi All, I am confused how to set up the following partial corr. I want to partial out Years of Supervisory Experience from correlations of males and...

    Started by statdane‎, 03-01-2013 11:03 AM
    partial correlation
    • Replies: 4
    • Views: 1,679
    03-01-2013, 04:52 PM Go to last post
  12. Median and Mode of a normal distribution

    Hello I have a random variable X~N(mu,sigma^2) I need to find the median and mode. Now, I know it's mu, it's known, but I need to show it,...

    Started by Yankel‎, 03-01-2013 08:41 AM
    • Replies: 4
    • Views: 2,591
    03-01-2013, 04:16 PM Go to last post
  13. multiplying Standard error of means

    Hi guys, I am new here (and also to statistics :o). I have a data set of many measurements. For each one of them I calculated the mean and the...

    Started by frymor‎, 03-23-2011 10:29 AM
    sem, standard deviation, standard error
    • Replies: 5
    • Views: 17,606
    03-01-2013, 03:54 PM Go to last post
  14. Data analysis (with R)

    I'm taking a data analysis course with R and in my assignment I am asked how variables A, B and C are associated with X. My answer should include...

    Started by valle89‎, 03-01-2013 04:07 AM
    analysis, data, r language
    • Replies: 2
    • Views: 1,960
    03-01-2013, 10:29 AM Go to last post
  15. getting the correct sample size

    Hi I am trying to use the sample size calculator on www.dssresearch.com to create a sample size for my study. My question is what values should I...

    Started by daisyboi‎, 02-21-2013 04:42 PM
    • Replies: 6
    • Views: 1,770
    03-01-2013, 06:35 AM Go to last post
  16. Which analysis to use?

    Greetings! I am a clinician with a dataset derived from a retrospective chart review. I have an n of 160, 80 males and 80 females. These are...

    Started by james000222‎, 12-12-2012 12:21 PM
    • Replies: 2
    • Views: 1,025
    03-01-2013, 02:13 AM Go to last post
  17. Multiple Regression OR GLM with repeated measures???

    I have the following data set. The average rent per year has been measured in 5 communities (one rent per community) over 10 years. Some of these...

    Started by Lilli87‎, 02-28-2013 06:23 PM
    analysis of covariance, multiple regression, spss
    • Replies: 1
    • Views: 1,014
    02-28-2013, 09:34 PM Go to last post
  18. Solving for Probability of a Population's Sum

    Hello, I am given a sample of size n from a Uniform distribution. I know that its mean is \frac{1}{2}\ \text{and variance}\ \frac{1}{12} ...

    Started by S-C-3-1-3‎, 02-28-2013 02:51 PM
    • Replies: 4
    • Views: 1,448
    02-28-2013, 08:23 PM Go to last post
  19. Skewed Continuous Predictor - dichotomize or treat as continuous?

    Hello All, I have two scales with 7 binary items. The simple raw scores from these scales (summing the item responses of 0 or 1) are very skewed...

    Started by katie25‎, 02-28-2013 10:13 AM
    continuous iv, dichotomous iv, skewness
    • Replies: 7
    • Views: 3,451
    02-28-2013, 03:46 PM Go to last post
  20. planned comparison (post hoc) with fewer than 3 groups?

    Say you've found that the IV "sex" has a significant effect on your DV, but you want to know the nature of that effect. If your IV were something...

    Started by mjgray‎, 02-25-2013 03:11 PM
    anova, gender identity, groups, post hoc tet, sex
    • Replies: 7
    • Views: 2,485
    02-28-2013, 03:44 PM Go to last post
  21. Unable to decide what test to use

    Hello everyone, I am new to statistic. I have 2 group of people. group A and Group B. And I have 3 main questions/statements for users to...

    Started by zafi2407‎, 02-28-2013 11:26 AM
    • Replies: 2
    • Views: 822
    02-28-2013, 12:28 PM Go to last post
  22. deriving coefficients for interaction term

    Given the yi = B0 + B1xi;sex + B2xi;age + B3XisexXiage + ei where B3 is interaction term between sex and age. Sex: Male:1; Female: 0 Can B3 be...

    Started by biobee‎, 02-28-2013 12:20 PM
    • Replies: 0
    • Views: 1,288
    02-28-2013, 12:20 PM Go to last post
  23. Comparing 2 time series with daily SE values - which test?

    Hello everybody! I have measured emissions from 2 treatments over 1 year on a daily basis. Since 3 measurements per day were taken, I have SE...

    Started by SoilScientist‎, 02-28-2013 10:54 AM
    • Replies: 0
    • Views: 1,356
    02-28-2013, 10:54 AM Go to last post
  24. Calculating diversity in different samples

    My knowledge of statistics is quite basic, so I apologize in advance if the answer to this question is obvious. I'd really appreciate any help. ...

    Started by fievel‎, 02-28-2013 07:49 AM
    • Replies: 2
    • Views: 1,569
    02-28-2013, 08:31 AM Go to last post
  25. Post Why remove non-sig interaction terms when building hierarchical models of ANOVA

    Hi, I hope someone can offer me some help here! In an assignment we have been asked to explain what to do if you have non-sig interaction terms...

    Started by stats-student‎, 02-24-2013 08:41 AM
    • Replies: 2
    • Views: 1,565
    02-28-2013, 08:14 AM Go to last post
  26. p-test for the hypothesis that the regression coefficient is zero

    I am asked to do a single and multiple regression on various variables affecting wages using STATA and a data set. Afterwards I'm asked to: record...

    Started by kingsolomonsgrave‎, 02-27-2013 11:48 PM
    • Replies: 0
    • Views: 1,102
    02-27-2013, 11:48 PM Go to last post
  27. Test for comparing two population sizez

    I'm really struggling to get the right stats tests for my data. I have a group that is spilt my gender and then again into age catergories.I want to...

    Started by gpater91‎, 02-27-2013 05:56 PM
    • Replies: 1
    • Views: 797
    02-27-2013, 09:12 PM Go to last post
  28. Calculating Estimated Standard Error

    Hello! The question is "For two factors-starchy or sugary and green base leaf or white base leaf-the following counts for the progeny of self...

    Started by Slime‎, 02-27-2013 07:21 PM
    • Replies: 0
    • Views: 857
    02-27-2013, 07:21 PM Go to last post
  29. How to convert statistical counting error into percent?

    Hello! I am trying to calculate appropriate error bars on a figure for a scientific paper. My original data was a simple count of # of photons...

    Started by aklytle‎, 02-27-2013 01:25 PM
    • Replies: 0
    • Views: 922
    02-27-2013, 01:25 PM Go to last post
  30. Normal Distribution question

    Hello, I am trying to find b in: X~N(-1.5,1.44) P(-b<X<b)=0.447 what I did is: P(X<b)-P(X<-b)=P(X<b)-=2P(X<b)-1=0.447 --> P(X<b)=0.7235

    Started by Yankel‎, 02-27-2013 05:36 AM
    • Replies: 3
    • Views: 975
    02-27-2013, 01:07 PM Go to last post
  31. Paired t-Test

    Hello fellow Talk Stats members! I'm doing some homework regarding business statistics. I'm having trouble doing one question in particular (see...

    Started by Mr K‎, 02-27-2013 11:13 AM
    • Replies: 2
    • Views: 1,099
    02-27-2013, 12:35 PM Go to last post
  32. Problem Calculating 90% Confidence Intervals

    Hello, I am trying to solve the following problem: "Suppose that an independent identically distributed sample of size 16 from a normal...

    Started by S-C-3-1-3‎, 02-27-2013 01:47 AM
    • Replies: 3
    • Views: 1,117
    02-27-2013, 12:12 PM Go to last post
  33. Standard deviation/E@R over time with changing exposure

    Hello, I need some help with this statistics/finance problem: Imagine you own an asset over four periods and the value of it is affected by...

    Started by kieranpcondon‎, 02-27-2013 04:50 AM
    • Replies: 1
    • Views: 1,931
    02-27-2013, 11:07 AM Go to last post
  34. What test can I use?

    Hi, I have data on the same participant group over a four year period. I'm looking to see whether there are distinct patterns within this data,...

    Started by cls1‎, 02-27-2013 07:53 AM
    • Replies: 2
    • Views: 1,359
    02-27-2013, 11:02 AM Go to last post
  35. statistical test with zeros

    Hi, I need some opinions about my question, if you could help me. I have a lot of vectors (a list) like this and I need to apply some...

    Started by slavia‎, 02-26-2013 10:24 AM
    • Replies: 6
    • Views: 1,687
    02-27-2013, 10:21 AM Go to last post
  36. Unhappy forecasting dependent time series

    Hi guys, I have a problem to solve and for which I am struggling to find a good approach, so I was hoping that someone might have some insight......

    Started by Bob777‎, 02-27-2013 12:47 AM
    • Replies: 4
    • Views: 1,314
    02-27-2013, 09:27 AM Go to last post
  37. Post finding the impacts of independent variables to dependent variables

    Hi everyone. I am new in this forum and also new in statistic. My background is civil engineering. I've been looking for a solution for my question...

    Started by garybooz‎, 02-26-2013 06:11 AM
    non-parametric, significance testing
    • Replies: 5
    • Views: 1,792
    02-27-2013, 01:45 AM Go to last post
  38. T-Test with Chi-Square

    Is the t-test always used with chi-square?

    Started by TheStatProf‎, 02-26-2013 11:48 AM
    chi-square, t-test
    • Replies: 7
    • Views: 1,719
    02-26-2013, 10:18 PM Go to last post
  39. Repeated measures ANOVA vs 1-way ANOVA with repeated measures

    Hi, I'm not a statistician or mathematician, I'm a biological science student and could do with your help please! :) My lecturer confused me today...

    Started by hrj21‎, 02-26-2013 04:20 PM
    • Replies: 0
    • Views: 1,063
    02-26-2013, 04:20 PM Go to last post
  40. Post [Sponsored]Statistical estimations with Finaquant Protos – free .net library with tab

    Hello all, We would like to introduce our non-commercial software for students and academic staff: finaquant® protos - free .net library with...

    Started by quark‎, 02-26-2013 01:38 AM
    • Replies: 0
    • Views: 21,534
    02-26-2013, 01:38 AM Go to last post
  41. Bivariate Gaussian - Axses of Ellipses & Prob. Contours

    Hi, I found the following link on the web which explains quite well the steps I need to follow to calculate Axes points of probability contours. ...

    Started by TomObserver‎, 02-25-2013 07:03 PM
    bivariate gaussian, eigenvalues, eigenvector
    • Replies: 6
    • Views: 2,984
    02-25-2013, 08:17 PM Go to last post
  42. How to Quantify if Past Performance Effects Future Performance

    Hi TalkStats users, I have data sets of fund performance, 100 funds, between the years 2000-2005 and 2006-2011 and wish to compare the data. Does...

    Started by MartinNU‎, 02-06-2013 03:43 PM
    • Replies: 3
    • Views: 1,512
    02-25-2013, 07:07 PM Go to last post
  43. Exclamation Minimum Clinically Important Difference

    I can't figure out out to find this! lol. I've contacted experts in the field with no response as a last resort. Does anyone have an idea how I...

    Started by StatsNovice11‎, 02-25-2013 06:24 PM
    • Replies: 1
    • Views: 1,201
    02-25-2013, 06:34 PM Go to last post
  44. Creating Contrasts

    hi - I have a an assignment that I'm working on, and I'm a bit stuck (or perhaps overthinking it...): The assignment has four groups: group...

    Started by nipper‎, 02-25-2013 04:13 PM
    • Replies: 2
    • Views: 2,863
    02-25-2013, 06:10 PM Go to last post
  45. Performing a t-test on averages??

    Is it "statistically legal" to perform a t-test on the averages of two groups? In other words, the data set values are averages themselves (example:...

    Started by antstat‎, 02-25-2013 04:59 PM
    averages, mean of means, pseudo-replication, t-test, ttest
    • Replies: 0
    • Views: 1,523
    02-25-2013, 04:59 PM Go to last post
  46. Confidence Interval for a Proportion of a Population

    I was hoping someone could help me out with a problem based on an audit performed where I work. To provide some context, we are required to audit...

    Started by tgriffi2‎, 02-25-2013 03:52 PM
    • Replies: 0
    • Views: 959
    02-25-2013, 03:52 PM Go to last post
  47. Why is the mean of sample variances not equal to the population variance?

    Several texts say that the mean of all values of an unbiased estimator is equal to the parameter it is estimating. They also say that the sample...

    Started by doajig‎, 02-14-2013 05:35 PM
    bessel's correction, biased estimator, mean of sample variances, sample variance, unbiased estimator
    • Replies: 2
    • Views: 4,169
    02-25-2013, 03:38 PM Go to last post
  48. Interpreting a R^2 in light of a regression coefficient

    If I have a regression coefficient of say 0.5 and a R^2 of 0.01 how do I interpret this? The dependent variable increases by 0.5 for a one unit...

    Started by kingsolomonsgrave‎, 02-25-2013 01:00 PM
    • Replies: 1
    • Views: 1,272
    02-25-2013, 01:57 PM Go to last post
  49. Beta Distribution

    When we are using Beta distribution, does the low values of alpha and beta have any effect on posterior and meant that the data weighed much more...

    Started by shany‎, 02-25-2013 12:59 PM
    beta distribution
    • Replies: 3
    • Views: 1,359
    02-25-2013, 01:50 PM Go to last post
  50. interpreting a regression coefficient

    Having done a linear regression on two variables: one for student reading test scores (ranging from about 300 to 600) and one for teacher experience...

    Started by kingsolomonsgrave‎, 02-25-2013 12:56 PM
    • Replies: 1
    • Views: 1,239
    02-25-2013, 01:49 PM Go to last post
  51. SPSS: Creating plots with data adjusted for covariance

    So, I have to variables: Arterial stiffness and disease duration (yrs). What I want to do is make a scatter plot (or something similar) to explore...

    Started by eirikik‎, 02-25-2013 07:47 AM
    • Replies: 0
    • Views: 1,480
    02-25-2013, 07:47 AM Go to last post
  52. Correlation between two times series?

    Hello, I have two sets of data that occur at regular monthly intervals and i want to see how they correlate however, i'm not sure how to go about...

    Started by joshuanathan‎, 02-25-2013 07:10 AM
    • Replies: 0
    • Views: 1,210
    02-25-2013, 07:10 AM Go to last post
  53. Hypothesis testing problem

    This is a question posted by a prof of mine, it was posted yesterday, due tomorrow, he does not answer e-mails and I don't know where to begin. ...

    Started by kingsolomonsgrave‎, 02-11-2013 08:53 PM
    • Replies: 2
    • Views: 1,391
    02-24-2013, 08:14 PM Go to last post
  54. standard error question

    given that the standard error is calculated as sd/sqrt(n), the standard error in different sub groups will differ according to their sd and how big n...

    Started by kingsolomonsgrave‎, 02-24-2013 08:13 PM
    • Replies: 0
    • Views: 885
    02-24-2013, 08:13 PM Go to last post
  55. Box's Test sig .000 - now what?

    I'm running a manova (teaching myself along the way) and I can't seem to get a handle on something - I'm not sure if I'm having a sample size problem...

    Started by mjgray‎, 01-18-2013 03:03 AM
    • Replies: 13
    • Views: 8,387
    02-24-2013, 06:31 PM Go to last post
  56. [JMP] Which test should I use? Comparing the fit between nominal variables

    Hello, I have a data set of 136 participants. Each participant completed a drawing and a story. The drawings and stories are each rated twice, as...

    Started by Gaelan‎, 02-23-2013 04:18 PM
    • Replies: 2
    • Views: 2,109
    02-24-2013, 05:21 PM Go to last post
  57. What's an easy way to write an MA(p) process as an infinite series?

    For MA(1) or AR(1) I know how to find the infinite series representation, but how do you write this for MA(p) or AR(q) for p >1, q>1? For example if...

    Started by lord12‎, 02-24-2013 03:10 PM
    • Replies: 0
    • Views: 893
    02-24-2013, 03:10 PM Go to last post
  58. Variance question

    Hello, Any help with this one would be appreciated. In a college 80 students are taking the exam in the spring semester. Their grades has a...

    Started by Yankel‎, 02-24-2013 08:57 AM
    • Replies: 3
    • Views: 1,690
    02-24-2013, 01:33 PM Go to last post
  59. Forecasting MA(1) process

    Suppose x_{t} = w_{t} + \theta w_{t-1} where w_t is white noise with variance \sigma_{w}^2 Derive the minimum mean square error one-step forecast...

    Started by lord12‎, 02-23-2013 10:49 PM
    • Replies: 3
    • Views: 10,109
    02-24-2013, 12:29 PM Go to last post
  60. 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: 2,390
    02-24-2013, 11:57 AM Go to last post

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