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Forum: Regression Analysis

Linear regression, linear models, nonlinear regression

  1. Poisson regression

    Hello, Is it possible to do a Poisson regression with only 6 observations? What is the minimum number of observations possible? Giovanna

    Started by Giovanna‎, 06-18-2009 05:48 AM
    • Replies: 0
    • Views: 3,434
    06-18-2009, 05:48 AM Go to last post
  2. Cov in multiple linear regression

    For multiple linear regression model Y = Xβ + e, assume X is non-random. Assume Gauss-Markov assumptions hold. Show that variance-covariance matrix...

    Started by hanelliot‎, 06-19-2009 08:35 PM
    • Replies: 3
    • Views: 5,380
    06-19-2009, 09:32 PM Go to last post
  3. Sum of the residuals in multiple linear regression

    In my textbook, the following results are proved in the context of SIMPLE linear regression: ∑e_i = 0 ∑(e_i)(Y_i hat)= 0 I tried to modify the...

    Started by kingwinner‎, 06-20-2009 07:09 AM
    • Replies: 1
    • Views: 7,503
    06-20-2009, 07:28 AM Go to last post
  4. Multiple linear regression: partial F-test

    "Suppose that in a MULTIPLE linear regression analysis, it is of interest to compare a model with 3 independent variables to a model with the same...

    Started by kingwinner‎, 06-18-2009 08:58 PM
    • Replies: 5
    • Views: 20,712
    06-20-2009, 11:32 AM Go to last post
  5. Regression SS in multiple linear regression

    In MULTIPLE linear regression, is it still true that the regression sum of squares is equal to ∑ (Y_i hat -Y bar)^2 ??? My textbook defines...

    Started by kingwinner‎, 06-20-2009 07:04 AM
    • Replies: 3
    • Views: 5,618
    06-20-2009, 04:55 PM Go to last post
  6. variance-stabilizing transformation for simple linear regression

    studying for a test.. need some help. Consider a simple linear regression analysis with β0 and β1 both positive. Suppose that the mean of the...

    Started by hanelliot‎, 06-21-2009 12:07 PM
    • Replies: 1
    • Views: 3,951
    06-21-2009, 06:43 PM Go to last post
  7. Multiple chi-square or logistic regression?

    Hi, I'm new to statistics and am working on a project for work. I have read extensively and believe I am on the correct path, but would like to...

    Started by Chris Webber‎, 06-22-2009 08:54 AM
    • Replies: 1
    • Views: 6,677
    06-22-2009, 07:36 PM Go to last post
  8. Best laid plans...

    My thesis design was to give participants 2 tests. One measures a personal "type" and the other asks "opinions". My manipulation was to reverse...

    Started by Roadguru‎, 05-28-2009 10:21 PM
    • Replies: 12
    • Views: 3,578
    06-24-2009, 04:04 PM Go to last post
  9. what is the best model to use?

    I have been working on this project for over 4 months. My model was approved by supervisor. The model was to run a multinomial logistic regression to...

    Started by squidly‎, 07-04-2009 09:18 AM
    • Replies: 1
    • Views: 1,981
    07-05-2009, 11:40 AM Go to last post
  10. Attempting the Impossible? Please help!

    I've been tasked with conducting a statistical analysis and have encountered a few potentially significant problems. As its been quite some time...

    Started by carriedinterest‎, 07-07-2009 08:21 AM
    • Replies: 0
    • Views: 2,440
    07-07-2009, 08:21 AM Go to last post
  11. Web Analyst: Been a While Since I Touched Stats

    Hey everyone, I joined up to this site looking to get some advice. I have been doing web analytics for just over 2 years now. I have an...

    Started by JTWood‎, 07-06-2009 11:03 PM
    • Replies: 5
    • Views: 2,718
    07-08-2009, 08:23 PM Go to last post
  12. Factorial ANOVA

    I am not sure if what i am about to ask would make complete sense so let me start from the beginning. I'm doing research to measure five different...

    Started by jaanus_lallu‎, 07-11-2009 06:11 PM
    • Replies: 2
    • Views: 3,059
    07-15-2009, 06:49 AM Go to last post
  13. Logistic regression vs multiple regression

    I have a 3 predictor variables that I am using to predict participation rates. How do I determine whether to use logistic regression or multiple...

    Started by Cohen's monkey‎, 07-15-2009 06:20 PM
    • Replies: 1
    • Views: 6,389
    07-15-2009, 07:54 PM Go to last post
  14. Please explain differences between R and r

    Hello, I received my dissertation back with comments from the dean. He flagged the following text and added the following comments: Am I...

    Started by lph2005‎, 07-17-2009 11:48 PM
    • Replies: 0
    • Views: 8,368
    07-17-2009, 11:48 PM Go to last post
  15. Simple Linear Regression with GUM Uncertainties

    I would appreciate it if someone could suggest some references that discuss how to formally incorporate measurement uncertainties (as calculated per...

    Started by Tom La Bone‎, 07-23-2009 04:31 PM
    • Replies: 0
    • Views: 4,356
    07-23-2009, 04:31 PM Go to last post
  16. Ordinal Logistic Regression and Bimodality

    Hello, I'm running ordinal logistic regressions with survey weights. I was under the impression that there are no distributional assumptions for...

    Started by trafalgar‎, 07-24-2009 01:28 PM
    • Replies: 0
    • Views: 4,391
    07-24-2009, 01:28 PM Go to last post
  17. Calculating Omega Squared

    Hi All I have been battling with my stats over the last two months and have managed, by reading books and researching the web, to stumble through...

    Started by 2461c‎, 07-26-2009 06:30 AM
    • Replies: 2
    • Views: 26,089
    07-28-2009, 10:25 AM Go to last post
  18. Wink Regression/Time Series

    Hello All:wave: I am looking for research help:yup: There is a data set and the goal is to build a model. There are events that happen....

    Started by iknowu99‎, 03-18-2009 03:55 PM
    • Replies: 11
    • Views: 5,320
    07-30-2009, 03:28 PM Go to last post
  19. Which test to use?

    I have just learned that I chose the wrong test for my data and I am now at a total loss. Basically I sent out a questionnaire which had a likert...

    Started by 2461c‎, 07-28-2009 10:31 AM
    • Replies: 3
    • Views: 2,369
    08-01-2009, 02:44 AM Go to last post
  20. Smile Nonparametric multivariate survey analysis - suggestions please!

    Hi I'm about to start analysis on some educational survey data with the following predictor and response variables: PREDICTOR: age class (2...

    Started by Tabs‎, 08-01-2009 03:28 PM
    • Replies: 2
    • Views: 2,227
    08-02-2009, 04:27 PM Go to last post
  21. relationship between test conditions and time to failure using linear regression

    Hello all, I'm Tom and i've decided it'd be a good idea to join this forum as i'm just about to start my third year of my degree in september; a Beng...

    Started by t0mmm‎, 08-04-2009 06:39 AM
    • Replies: 0
    • Views: 1,694
    08-04-2009, 06:39 AM Go to last post
  22. Dependent / conditional regression?

    Hi there! Long time lurker, first time poster (first post in ANY board), so my sincerest apologies if I'm doing anything wrong! I have searched...

    Started by Murphy-dk‎, 08-11-2009 05:23 AM
    • Replies: 0
    • Views: 2,042
    08-11-2009, 05:23 AM Go to last post
  23. Using Regression When Y = # Wins

    Hello, This is my first post, and so I apologize if this is a dumb question. I'm considering using multiple linear regression to predict Y = #...

    Started by GaryB‎, 08-18-2009 01:01 AM
    • Replies: 2
    • Views: 2,436
    08-18-2009, 04:43 PM Go to last post
  24. Problem with small amount of cases

    Hi New here, and fairly new with statistics. I have a problem with too few cases, but more than enough variables and observations. I have no...

    Started by Cai‎, 08-16-2009 11:47 AM
    • Replies: 5
    • Views: 2,467
    08-19-2009, 12:09 PM Go to last post
  25. Moderation graphs

    Hi all, (I hope I'm posting this in the right sub-forum) I have two data sets for which I've done hierarchical regression analysis to test for...

    Started by darc‎, 09-02-2009 06:10 AM
    • Replies: 0
    • Views: 13,278
    09-02-2009, 06:10 AM Go to last post
  26. help with interpretation of multiple regression results

    Dear forum members, I am running multiple regressions with SPSS and I need help with possible interpretation of my results. Firm...

    Started by metanex‎, 09-03-2009 02:19 AM
    • Replies: 0
    • Views: 3,456
    09-03-2009, 02:19 AM Go to last post
  27. mahalanobis distance critical values > 10 df

    dear all, analysing my dataset (N=1056) with SPSS for my Ph.D., I'm currently testing with linear multiple regression. before entering a...

    Started by hbos‎, 09-03-2009 09:58 AM
    • Replies: 0
    • Views: 10,968
    09-03-2009, 09:58 AM Go to last post
  28. I need to understand regression analysis. Please Help

    Hi guys i need help badly. We were given this to solve in my first RA class and i have no idea how to begin. Please this is the first time i'm...

    Started by henryneo‎, 09-01-2009 10:07 AM
    • Replies: 2
    • Views: 3,213
    09-06-2009, 09:00 PM Go to last post
  29. predicting X using multiple regression?

    Hello: I have been reviewing a study in which Multiple Linear Regression (MLR) was used to evaluate the relationship between the concentration of...

    Started by AquaMan‎, 09-11-2009 04:56 PM
    • Replies: 0
    • Views: 2,079
    09-11-2009, 04:56 PM Go to last post
  30. Can I use mediation with my data?

    Thanks for taking the time to read this in advance it is quite detailed, but I'm currently working on my psychology honours dissertation, and due to...

    Started by kristy008‎, 09-12-2009 10:08 PM
    • Replies: 2
    • Views: 3,442
    09-13-2009, 01:27 AM Go to last post
  31. Error estimates with r2 in linear regression

    I have been given the results of some regression analysis, where some variable y is a function of x1 and x2. I have a r2 value for the analysis, and...

    Started by mh8782‎, 09-18-2009 04:29 AM
    • Replies: 2
    • Views: 3,088
    09-18-2009, 09:44 AM Go to last post
  32. How do I do this calculation

    Hi all, I am a mature student and just dont get how to do what most around me take as simple calculations This is from a coefficients table where...

    Started by kay2000‎, 09-20-2009 08:40 PM
    • Replies: 1
    • Views: 2,453
    09-20-2009, 09:14 PM Go to last post
  33. Question Classification Rate of Multivariate Logistic Regression

    Hello, I'm running a binary (2 groups), multivariate (multiple predictors) logistic regression analysis, and would like to test the classification...

    Started by eyeballjunk‎, 09-28-2009 09:10 AM
    • Replies: 1
    • Views: 5,085
    09-29-2009, 03:01 PM Go to last post
  34. Beta coefficients in multiple regression

    Hi guys. I have a question about beta coefficients that are calculated for standard multiple linear regression procedure. I kind of don't...

    Started by kobylkinks‎, 01-30-2009 04:02 AM
    • Replies: 4
    • Views: 21,907
    10-06-2009, 09:35 AM Go to last post
  35. Question what is: correlation? regression? confidence?

    I need to learn statistics for a project I'm working on. I am totally lost and am spending more time than I thought I would on trying to understand...

    Started by brad henrie‎, 10-08-2009 08:38 PM
    • Replies: 1
    • Views: 4,797
    10-09-2009, 03:40 AM Go to last post
  36. Linear regression analysis - Urgent assistance required

    Hi I am trying to examine the relation between ad. liking and attitude towards the brand. My hypothesis H1: "Commercials that are liked will...

    Started by bulu‎, 10-09-2009 06:14 PM
    • Replies: 6
    • Views: 4,894
    10-11-2009, 04:10 AM Go to last post
  37. Time-series analysis with three variables

    :wave:I have some time-series across three variables. I want to see the association of two variables while controlling for a third. I am using SPSS...

    Started by jimd@uic.edu‎, 10-13-2009 08:26 AM
    • Replies: 0
    • Views: 3,550
    10-13-2009, 08:26 AM Go to last post
  38. Latent growth process

    Hi, I'm starting a study investigating the use of several medical imaging measurements taken pre-treatment to predict treatment outcome. Treatment...

    Started by parkej‎, 10-15-2009 03:51 PM
    • Replies: 0
    • Views: 1,611
    10-15-2009, 03:51 PM Go to last post
  39. scale issues

    Please look at the following descriptive labels for a scale of importance. Extremely critical (7) Highly important (6) Very Important (5) ...

    Started by Dr.Appalayya‎, 10-17-2009 04:53 AM
    • Replies: 4
    • Views: 2,644
    10-19-2009, 08:11 AM Go to last post
  40. Logistic regression null values

    I think I know the answer, but just confirming. I'm doing a multiple logistic regression with 15 predictor variables. Must ALL values of the...

    Started by jawon‎, 10-21-2009 05:30 PM
    • Replies: 0
    • Views: 3,901
    10-21-2009, 05:30 PM Go to last post
  41. Standard Error of Coefficients in Multiple Regression

    Hi, I have built a model in Excel to do Multiple Regression. I am able to correctly calculate the intercept and the regression coefficients but I...

    Started by JoeA838‎, 10-26-2009 02:08 PM
    • Replies: 1
    • Views: 14,086
    10-26-2009, 02:49 PM Go to last post
  42. Post ANCOVA controversy?

    Hello all, I have a question regarding ANCOVA, which seems straightforward, however an answer has eluded me. The question is: Can a...

    Started by jhdc‎, 10-31-2009 04:43 PM
    • Replies: 3
    • Views: 12,127
    11-03-2009, 08:30 PM Go to last post
  43. Multiple Regression Interaction

    Figured it out, thanks!

    Started by jamesmartinn‎, 11-05-2009 02:54 PM
    • Replies: 0
    • Views: 2,614
    11-05-2009, 02:54 PM Go to last post
  44. using prediction results in a separate model

    hello! I'm looking for some feedback on an idea, if you're interested. The issue at hand is how to deal with the variable "age" as a predictor of...

    Started by phoebe‎, 11-05-2009 04:20 PM
    • Replies: 1
    • Views: 2,245
    11-07-2009, 05:48 PM Go to last post
  45. How many IVs can I use?

    I am hoping to publish the results of this in a journal (not a statistics one, an experimental science one). I have a sample size of 71...

    Started by BrenH‎, 11-05-2009 01:00 AM
    • Replies: 2
    • Views: 3,022
    11-11-2009, 04:08 PM Go to last post
  46. Exclamation Problem interpreting Multiple Regression on Video Game Sales

    Hi everyone, I am a new member, I am so glad to have found the forum. I'm tearing my hair out about this problem. These are my results: ...

    Started by aplfalcon‎, 11-09-2009 10:17 PM
    • Replies: 3
    • Views: 5,322
    11-11-2009, 04:28 PM Go to last post
  47. Multiple Regression Help

    Hi, I'm currently working on an assignment in which I have to run a multiple regression, however I am a little confused regarding the order of the...

    Started by boogers‎, 11-12-2009 05:20 PM
    • Replies: 1
    • Views: 2,230
    11-13-2009, 08:02 AM Go to last post
  48. Analysis of data set derived from simulation

    I'm an engineer working for an architecture firm, and I'm currently trying to analyze some data I've derived from a parametric building simulation I...

    Started by jeemang‎, 11-19-2009 06:50 PM
    • Replies: 0
    • Views: 1,968
    11-19-2009, 06:50 PM Go to last post
  49. have a .por file, no spss, need to run analysis by tomorrow

    Hi all.. I thought I could open the .por file I have on my home computer but it turns out the version I have doesn't open a file like this with more...

    Started by Empathy‎, 11-23-2009 09:13 PM
    • Replies: 0
    • Views: 3,807
    11-23-2009, 09:13 PM Go to last post
  50. Nonparametric multiple regression

    I want to know how to conduct the nonparametric equivalent of a multiple regression? I have 3 variables that are correlated according to spearman's...

    Started by marinelizard‎, 11-27-2009 06:26 PM
    • Replies: 0
    • Views: 3,217
    11-27-2009, 06:26 PM Go to last post
  51. Hpw to Determine the Hypotheses for a T-test Study?

    delete thread mods please. thanks.

    Started by SoLost‎, 11-28-2009 04:13 AM
    • Replies: 4
    • Views: 4,578
    11-29-2009, 12:04 AM Go to last post
  52. Multiple regression

    I am a bit confused with multiple regression. I understand every predictor will lead to different Y values and will create different linear lines...

    Started by jamie10‎, 11-30-2009 05:44 AM
    • Replies: 0
    • Views: 2,103
    11-30-2009, 05:44 AM Go to last post
  53. Linear Regression

    Hi, I have a dataset which contains a long list of variables (categorical eg. gender, zipcode group etc and continuous eg. income, home value etc)...

    Started by blueycool‎, 12-01-2009 11:19 AM
    • Replies: 0
    • Views: 2,057
    12-01-2009, 11:19 AM Go to last post
  54. very quick question about the 'intercept'

    If I am asked to state the intercept which one do I quote? Estimate, Std error, t value or Pr(>|t|) ? (If it makes any difference I am doing a...

    Started by misc763‎, 12-03-2009 03:47 PM
    • Replies: 4
    • Views: 3,811
    12-03-2009, 04:47 PM Go to last post
  55. multivariate multiple regression

    Hello all: I'm working on a multivariate multiple regression analysis in SAS. I have 3 response variables and 2 independent variables. When...

    Started by jamesmartinn‎, 12-03-2009 06:58 PM
    • Replies: 0
    • Views: 4,495
    12-03-2009, 06:58 PM Go to last post
  56. multiple regression and adjusted r-squ

    Hi there, I just found this forum in a fit of frustration and angst... Anyway, I'm running a multiple linear regression in SAS for a final...

    Started by smurf‎, 12-05-2009 01:31 PM
    • Replies: 0
    • Views: 2,508
    12-05-2009, 01:31 PM Go to last post
  57. Chi square as sneak peek into logistic regression

    Let's say I have these variables... Dependent var: cancelled_flag Independent vars: region, gender, etc My ultimate goal is to do a logistic...

    Started by jawon‎, 12-03-2009 07:12 PM
    • Replies: 1
    • Views: 4,451
    12-05-2009, 08:23 PM Go to last post
  58. Teaching multivariate statistics: text & software recommendations

    Hello all, I'll be leading an introductory seminar to multivariate statistics in the spring and was looking for recommendations for texts that...

    Started by jwallin‎, 12-06-2009 07:20 PM
    • Replies: 3
    • Views: 4,440
    12-08-2009, 09:54 AM Go to last post
  59. confusion about Ho/Ha hypothesis for simple/multiple regression

    The one thing I do not understand (and my book doesn't explain) is how do you determine if it's Ha > 0, Ha < 0 or Ha =/= 0? Anyone can shed some...

    Started by Parad0x‎, 12-04-2009 01:02 PM
    • Replies: 2
    • Views: 9,386
    12-08-2009, 08:14 PM Go to last post
  60. Standard error of multiple regression coefficients

    I was revising my undergraduate courses of Statistics which I took before 20 years. I was exercising how to construct ANOVA table for a regression...

    Started by davidbinyam‎, 05-29-2008 11:13 AM
    • Replies: 14
    • Views: 34,457
    12-11-2009, 07:49 PM Go to last post

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