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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: 197,244
    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: 67,011
    09-30-2005, 09:44 AM Go to last post
  1. Confused about Correlation Terms

    Hi, I am confused about different correlation terms. Can you help me? Difference between Cross correlation, Serial Correlation and Seasonality...

    Started by Fred_a‎, 12-23-2012 11:48 PM
    correlation
    • Replies: 0
    • Views: 902
    12-23-2012, 11:48 PM Go to last post
  2. Which potential predictors to add to the logistic regression model?

    I am assessing the effects of some covariables and categorcial variables (exactly 5 independent variables) on a binary outcome. When I enter the...

    Started by victorxstc‎, 12-22-2012 04:36 PM
    • Replies: 4
    • Views: 3,219
    12-23-2012, 01:48 AM Go to last post
  3. How to compare two regression lines?

    Hi, I'm trying to find out if Pearson and Spearman correlations are equally suited for my data. I've computed some Pearson and Spearman correlations...

    Started by 5''‎, 12-22-2012 05:20 PM
    • Replies: 0
    • Views: 2,193
    12-22-2012, 05:20 PM Go to last post
  4. How do I fit a glmer with poisson distributed count data in R?

    Hello everybody, I just recently started exploring R and mixed models in order to analyze the data for my master thesis. However, my data is not...

    Started by getthebat‎, 12-21-2012 02:46 PM
    • Replies: 3
    • Views: 3,221
    12-22-2012, 12:50 PM Go to last post
  5. type of statistical test to use

    Hi everyone, I'm a beginner in statistics and SPSS. I have a hypothesis, an independent variable about the number of years of work experience...

    Started by Gemma.C‎, 12-21-2012 04:55 AM
    • Replies: 4
    • Views: 2,762
    12-21-2012, 05:10 PM Go to last post
  6. t-test to be used if values are not the mean??

    Dear all, I would be very grateful for any advice. I would like to calculate if 2 statistical results are significantly different from one...

    Started by KathiF‎, 12-20-2012 04:47 PM
    • Replies: 2
    • Views: 1,213
    12-21-2012, 11:34 AM Go to last post
  7. tough one !

    Hello guys , actually I got this problem as a bonus question to be delivered ASAP , I busted my ass trying to even start with it but I couldn't ! ...

    Started by Ahmedelwakeel‎, 12-21-2012 11:29 AM
    • Replies: 0
    • Views: 880
    12-21-2012, 11:29 AM Go to last post
  8. ANOVA? how?

    hi all, this is fairly elementary, though would appreciate any help: suppose I have 3 store locations that carry identical number of product types...

    Started by corrad‎, 12-20-2012 12:38 AM
    • Replies: 3
    • Views: 1,392
    12-20-2012, 06:24 PM Go to last post
  9. College Statistics Homework using Minitab

    I have attached the files for this project that i'm doing. My Professor did not go over any aspects of minitab and I was wondering if there is...

    Started by niemi7‎, 12-20-2012 03:36 PM
    • Replies: 1
    • Views: 1,159
    12-20-2012, 04:06 PM Go to last post
  10. Post Please help me with these STAT EXERCISES

    For the following variables, determine whether it is measured on Interval or Ratio Scales, Explain. X: attendance at last night's concert X: cost...

    Started by SonTo‎, 12-20-2012 01:59 PM
    • Replies: 0
    • Views: 1,124
    12-20-2012, 01:59 PM Go to last post
  11. How to report dummy variables (logistic regression, SPSS)

    I am trying to write up a logistic regression analysis into a table, but am confused with what to report. I have a categorical variable which has 3...

    Started by bakere‎, 12-20-2012 01:52 PM
    • Replies: 0
    • Views: 2,848
    12-20-2012, 01:52 PM Go to last post
  12. taking mean of two groups, how to get SE (not pooled!)

    Dear All, First the short question: Given only condition means and SEs in a repeated measures design, how do I compute the SE when collapsing...

    Started by dcnieho‎, 12-07-2012 02:08 AM
    • Replies: 4
    • Views: 1,690
    12-20-2012, 10:32 AM Go to last post
  13. Unhappy Help required for making graph representation

    Dear fellows; I have to present large data set as a graph in poster. I have attached the datasheet as .xls. In the sheet I have queries column...

    Started by reaz‎, 12-20-2012 02:38 AM
    • Replies: 0
    • Views: 924
    12-20-2012, 02:38 AM Go to last post
  14. Question for those already in work using statistical models

    I am a newb to stats and am wondering how in the workplace statistical models come about and take shape. This is what I envisage but no doubt it...

    Started by urbano‎, 12-19-2012 06:41 PM
    • Replies: 1
    • Views: 1,013
    12-19-2012, 07:19 PM Go to last post
  15. Binary logistic regression independent variables, help please asap

    Hi, I am writing a short paper on voter turnout. I would like to use bianary logistic regression for this purpouse. I have one problem, my household...

    Started by Dan23‎, 12-16-2012 05:06 PM
    • Replies: 2
    • Views: 1,831
    12-19-2012, 06:14 AM Go to last post
  16. Help understanding Q Q plot....

    I'm trying to understand elements of a Q Q plot and am struggling with the following.... So I understand if the quantiles of my sample match up...

    Started by urbano‎, 12-18-2012 10:06 PM
    • Replies: 1
    • Views: 4,758
    12-19-2012, 12:53 AM Go to last post
  17. Question Dealing with multicollinearity by separating common variance

    On this page, I read about multiple ways to deal with multicollinearity: http://www.chsbs.cmich.edu/fattah/courses/empirical/multicollinearity.html....

    Started by hpk2106‎, 12-18-2012 04:48 PM
    multicollinearity, regression
    • Replies: 0
    • Views: 1,111
    12-18-2012, 04:48 PM Go to last post
  18. Statistiical Measure of Mean AND Dispersion

    Started by Glottalpoly‎, 12-17-2012 11:11 PM
    • Replies: 2
    • Views: 1,044
    12-18-2012, 03:55 PM Go to last post
  19. Normal distrubtion (Find standard deviation)

    Random variable X is normally distributed. Mean = β , standard deviation = h given that the difference of 68th percentile and 36th percentile is...

    Started by well‎, 12-17-2012 05:03 AM
    • Replies: 4
    • Views: 1,728
    12-18-2012, 11:38 AM Go to last post
  20. Cox's Regression help

    Hello, I'm looking at survival in mice with 10 different knockouts. I've exposed these knockouts to 6 different diets and am looking to do a...

    Started by rockshow6‎, 12-17-2012 09:21 AM
    • Replies: 5
    • Views: 2,149
    12-18-2012, 09:14 AM Go to last post
  21. Unhappy 15 Likert scale questions: How do I find the mean, median and mode?

    Please Help! I need to find the mean the median and the mode and also use a t test to interpret my results between females and males in mate...

    Started by cardo‎, 12-17-2012 04:38 PM
    • Replies: 11
    • Views: 14,499
    12-18-2012, 03:03 AM Go to last post
  22. How do I input data from a survey onto SPSS?

    Title: Gender Differences in Mate Selection How do I input data from my survey onto SPSS? For example one of my questions is: How important do...

    Started by cardo‎, 12-17-2012 07:47 PM
    • Replies: 0
    • Views: 1,859
    12-17-2012, 07:47 PM Go to last post
  23. Likert items-->Likert scale-->analysis

    I'm working on a research project trying to identify motivation types and self-identity changes of the participants. Then I have to do group...

    Started by btomatoe‎, 12-17-2012 02:21 AM
    • Replies: 7
    • Views: 1,788
    12-17-2012, 06:25 PM Go to last post
  24. (SPSS logistic regression) Variable effect in wrong direction

    I am running a logistic regression with 7 IVs, N= 214. The model is significant and the R2 is .45. However, the individual variables show some odd...

    Started by bakere‎, 12-17-2012 10:05 AM
    • Replies: 2
    • Views: 2,206
    12-17-2012, 12:19 PM Go to last post
  25. minimal sufficient statistics

    Please anybody give the hint or solution...

    Started by wawataiji‎, 12-16-2012 11:56 AM
    • Replies: 3
    • Views: 2,374
    12-17-2012, 10:16 AM Go to last post
  26. statistics help please

    I'm having trouble with a few questions in my text book and was hoping you could help...I need to know this for my exam and I just need some help...

    Started by katanne2813‎, 12-17-2012 02:50 AM
    anova, correlation, factors, pearson, statistics
    • Replies: 0
    • Views: 3,689
    12-17-2012, 02:50 AM Go to last post
  27. residuals for Beta's as shown hw

    I need to interpret a residual table which was fitted by y_.0123 (final residual) against the x_1.023. The table represents residuals produced by...

    Started by Snowy88‎, 12-16-2012 06:04 PM
    homework
    • Replies: 0
    • Views: 1,511
    12-16-2012, 06:04 PM Go to last post
  28. Control Variate Monte Carlo

    Consider the function f(x)=e^{-x^2} . Using successfully higher order Taylor expansion , find two appropriate control functions. Then assuming ...

    Started by LED2127‎, 12-15-2012 10:23 PM
    • Replies: 3
    • Views: 3,248
    12-16-2012, 03:23 PM Go to last post
  29. statictics problem.

    the transform T ' = f(T) of a sufficient statistic T by a function f(.) is usually not sufficient : only when f(.) is one-to-one is f(T) always...

    Started by wawataiji‎, 12-16-2012 12:08 PM
    • Replies: 1
    • Views: 1,359
    12-16-2012, 12:46 PM Go to last post
  30. can someone solve this ?

    Started by Ahmedelwakeel‎, 12-15-2012 07:37 PM
    • Replies: 4
    • Views: 1,860
    12-16-2012, 04:16 AM Go to last post
  31. p-Values(Please Help asap, preparation for final exam)

    Hey, I have one question about the p-value. So for example, the test statistics of something will be 1.7821. So to find the p-value we use z-score. ...

    Started by ramil13‎, 12-15-2012 01:30 AM
    • Replies: 2
    • Views: 1,350
    12-15-2012, 09:07 AM Go to last post
  32. Binomial Distribution Cumulative Probability Table

    Ok so, the table starts from n=5 and ends at n = 25. Some questions I have are binomial questions that are for example X ~ (30, 0.5) <= is more...

    Started by ramil13‎, 12-15-2012 01:32 AM
    • Replies: 2
    • Views: 2,081
    12-15-2012, 09:04 AM Go to last post
  33. Statistics for mapping differences between groups over a time period?

    I'm in the middle of an experiment on mice in which each group contains a transgene of interest. Eachday, I have to count the number of deceased. The...

    Started by rockshow6‎, 12-08-2012 06:58 PM
    • Replies: 4
    • Views: 1,864
    12-15-2012, 06:25 AM Go to last post
  34. 4 continuous IVs predicting a single binary DV

    Like the title says... I have 4 continuous IVs, whose combined effects (i.e. interactions possible) should predict a binary DV (possible values 1...

    Started by fizix‎, 12-14-2012 02:04 PM
    binary dependent variable
    • Replies: 9
    • Views: 2,026
    12-14-2012, 07:44 PM Go to last post
  35. Test whether the SD of multiple normal distributions differs between two genes

    Hi, I am comparing data on gene expression between two different genes that have been tagged with GFP. Gene expression is measured using flow...

    Started by acgerstein‎, 12-14-2012 03:13 PM
    normal distribution, standard deviation
    • Replies: 0
    • Views: 1,155
    12-14-2012, 03:13 PM Go to last post
  36. Least Median of Squares

    Hello everyone, I have difficulty on when I try to estimate the regression coefficient (beta) in multiple linear regression through least median of...

    Started by Bella‎, 12-14-2012 05:48 AM
    • Replies: 1
    • Views: 2,259
    12-14-2012, 11:53 AM Go to last post
  37. Expected value of absolute value

    Please help me. I don't kown... how I solve the problem...

    Started by wawataiji‎, 12-13-2012 02:54 PM
    expected value
    • Replies: 6
    • Views: 4,610
    12-14-2012, 11:50 AM Go to last post
  38. correlogram and Dickey fuller test

    Hi eveyrone !! I'm kind of lost in time series analysis. I've never done it before, but I need to make some descriptive analysis of a series. I've...

    Started by Freymann‎, 07-30-2012 10:52 AM
    • Replies: 5
    • Views: 5,205
    12-14-2012, 11:02 AM Go to last post
  39. Independent Sample T Test - Levene's Test for Equality of Variances

    Hi everyone! I am currently doing a dissertation for my undergraduate studies. I am currently stuck with a question about Levene's Test for Equality...

    Started by xLioneLx‎, 12-12-2012 07:33 AM
    • Replies: 5
    • Views: 7,768
    12-13-2012, 09:48 PM Go to last post
  40. Goodness-of-fit of model derived from multivariate logistic regression

    I have a question regarding the relationship between the value of Chi square and df in determining the goodness-of-fit in a model derived from...

    Started by Satori‎, 12-13-2012 07:24 PM
    chi square, goodness of fit, multivariate logistic reg
    • Replies: 0
    • Views: 1,069
    12-13-2012, 07:24 PM Go to last post
  41. ANCOVA - testing interactions with multiple covariates

    Hello, I have a question concerning ANCOVA and was hoping one of you could help me out :). I tried looking all over the internet and of course in...

    Started by Jagers‎, 12-13-2012 03:33 PM
    • Replies: 4
    • Views: 6,269
    12-13-2012, 05:20 PM Go to last post
  42. Determine store close schedule

    Hi, Deleting this thread. Thanks!

    Started by barca‎, 12-13-2012 09:52 AM
    • Replies: 1
    • Views: 1,131
    12-13-2012, 04:17 PM Go to last post
  43. The MLE and sufficient statistic problem.

    the Problems is in imiges files... please help me...

    Started by wawataiji‎, 12-13-2012 02:31 PM
    mle
    • Replies: 3
    • Views: 2,192
    12-13-2012, 03:01 PM Go to last post
  44. Showing Beta is from Exponential family

    I'm trying to do the proof for beta to exponential family proof. here is what I did Can somebody check it and tell me if it's good? ...

    Started by ankc‎, 12-11-2012 12:15 PM
    • Replies: 4
    • Views: 2,578
    12-13-2012, 01:36 PM Go to last post
  45. Covariance of two functions for error propagation

    Hi all, I have two functions: X=A-B Y=A+2B I need to calculate the covariance of X and Y in terms of the (known) variances of A and B as...

    Started by FrankDrebon‎, 12-13-2012 09:58 AM
    covariance, error propagation
    • Replies: 2
    • Views: 3,312
    12-13-2012, 11:03 AM Go to last post
  46. Experiment design and analysis - please help!

    Hi all, I'm having a really rough time with some work I'm doing and the more I look at it the less any of it seems to makes sense! The...

    Started by shiv379‎, 12-13-2012 08:58 AM
    • Replies: 0
    • Views: 1,043
    12-13-2012, 08:58 AM Go to last post
  47. T-test help needed

    Hey there, I have data I collected from a CEGE test of two game prototypes my group and I developed for a course. There were two respondents, who...

    Started by Happysmiley‎, 12-12-2012 07:50 AM
    • Replies: 3
    • Views: 2,231
    12-13-2012, 08:52 AM Go to last post
  48. Non normality in residuals in SLR

    Hey guys. I've done a SLR and after testing the residuals for normality using the Shapiro-Wilk test and I've learned that the residuals are not...

    Started by starpen‎, 12-12-2012 03:05 PM
    normality, residuals, slr, wilk
    • Replies: 7
    • Views: 2,330
    12-13-2012, 03:26 AM Go to last post
  49. What analysis to use?

    Hi, I am helping a friend complete an analysis of some data. The experiment takes two groups -those with formal training in sound engineering...

    Started by holb‎, 12-11-2012 08:26 PM
    • Replies: 1
    • Views: 1,443
    12-12-2012, 11:38 PM Go to last post
  50. Binomial Distribution Significance Level

    Let X have a Binomial distribution with the number of trials n=15 and with probability of "success" p. We wish to test Ho: p=0.30 vs. H1: p doesn't...

    Started by marty6491‎, 12-12-2012 08:43 PM
    • Replies: 1
    • Views: 2,166
    12-12-2012, 11:28 PM Go to last post
  51. Finding point estimate for true average, median, variance, and standard deviation.

    I am given the data of-- 2.22, 1.96, 0.92, 1.77, 2.08, 1.60, 1.46, 1.73. I have a TI-84 Silver Plus Edition and I would like to know how to use it...

    Started by milleras‎, 12-12-2012 07:28 PM
    • Replies: 0
    • Views: 4,829
    12-12-2012, 07:28 PM Go to last post
  52. BIBD in SPSS?

    Could someone please point me to a good online resource for how to analyze and interpret a balanced incomplete block design using SPSS? Also, there...

    Started by marika‎, 12-12-2012 03:13 PM
    • Replies: 0
    • Views: 4,900
    12-12-2012, 03:13 PM Go to last post
  53. least squares homework

    I need help with this question and how to proceed need to rewrite the following regression fitting, can someone assist with this problem. I don't...

    Started by Snowy88‎, 12-12-2012 12:41 PM
    least squares
    • Replies: 3
    • Views: 1,634
    12-12-2012, 02:31 PM Go to last post
  54. what does it mean by criterion and power?

    The latest in the “You may be a redneck if . . . ” genre has produced a simple questionnaire. If more than 80% of the questions are answered in...

    Started by moe6142‎, 12-12-2012 01:54 PM
    • Replies: 1
    • Views: 1,146
    12-12-2012, 02:22 PM Go to last post
  55. t test question

    In your summer job at the Lucerne plant, you are in charge of the machine that packages frozen peas. It is supposed to package 1.0 kg of peas in a...

    Started by moe6142‎, 12-12-2012 12:26 PM
    • Replies: 3
    • Views: 1,249
    12-12-2012, 01:42 PM Go to last post
  56. question relatedto type 1, type 2 errors.

    let me see give me a sec

    Started by moe6142‎, 12-11-2012 08:26 PM
    • Replies: 1
    • Views: 1,768
    12-12-2012, 04:34 AM Go to last post
  57. Comparing kappa coefficients

    I have a simple R script which uses the psych package to calculate cohens kappa (weighted) from a csv file. The csv file has 2 columns of ordinal...

    Started by moadeep‎, 12-12-2012 04:03 AM
    • Replies: 0
    • Views: 1,209
    12-12-2012, 04:03 AM Go to last post
  58. Amchem's Tax Credit case study - stuck in a rut

    Hello everyone, and first of all thank you for taking the time to read this. I am a student in a Management postgraduate program and during our...

    Started by .chester‎, 12-10-2012 03:51 PM
    amchem tax credit, spss
    • Replies: 1
    • Views: 3,347
    12-12-2012, 03:34 AM Go to last post
  59. Binomial Distribution Hypothesis Testing

    Let X have a Binomial distribution with the number of trials n = 15 and with probability of “success” p. We wish to test H_0 : p = 0.30 vs. H_1 : p ≠...

    Started by marty6491‎, 12-10-2012 10:00 PM
    • Replies: 2
    • Views: 2,573
    12-11-2012, 10:19 PM Go to last post
  60. Likert scale analysis

    Hi. I have carried out a staff survey with about 30 questions grouped into a number of variables eg staff engagement, communication. I have done a...

    Started by crm‎, 12-08-2012 08:39 PM
    • Replies: 8
    • Views: 1,726
    12-11-2012, 05:51 PM Go to last post

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