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Forum: Regression Analysis

Linear regression, linear models, nonlinear regression

  1. Do I need to treat all variables in the same way when I transform values?

    Hi, I want to carry out a Pearsons correlation to look relationships between methane flux from soil under different plantation treatments (i.e...

    Started by froglett‎, 02-16-2008 08:24 AM
    • Replies: 3
    • Views: 6,486
    02-17-2008, 02:13 PM Go to last post
  2. Multiple logistic regression models

    Hi Am I correct in saying that if my results from multiple logistic regression show that the full model does not differ significantly from the...

    Started by WTwine‎, 01-23-2008 07:58 AM
    • Replies: 5
    • Views: 3,747
    02-20-2008, 09:00 AM Go to last post
  3. Regression approach to ANOVA

    I am trying to fit regression for some categorical variables. I have two treatment A(3 levels) and B (2 levels) and their interaction. The output...

    Started by lovedieer‎, 03-03-2008 11:17 PM
    • Replies: 6
    • Views: 4,247
    03-07-2008, 04:10 PM Go to last post
  4. Multiple Regression Question

    Hello, I am examining the association bertween two independent variables and a dependent variable using multiple regression. My dependent variable...

    Started by psychologygirl‎, 03-10-2008 03:06 PM
    • Replies: 0
    • Views: 2,735
    03-10-2008, 03:06 PM Go to last post
  5. Another question re: correlation and regression

    I seem to be getting confused between correlation and regression a bit... I'm trying to identify the relationship between a series of X variables...

    Started by arikel‎, 03-19-2008 01:25 PM
    • Replies: 3
    • Views: 2,486
    03-20-2008, 11:38 AM Go to last post
  6. Dummy Variables and Multiple Regression

    Hi, if someone could make this clear for me, would be much appreciated.. Is it possible to create a dummy variable for more than one outcome. ...

    Started by janeduluth‎, 03-20-2008 11:50 AM
    • Replies: 3
    • Views: 6,290
    03-20-2008, 03:09 PM Go to last post
  7. Partial R squares

    Is there a way to generate partial r-squares (automatically) in multiple regression? Assume a Model Y=X1 X2 X3. GLM produces estimates of R square...

    Started by evm‎, 03-25-2008 12:06 PM
    • Replies: 3
    • Views: 8,603
    03-25-2008, 03:58 PM Go to last post
  8. Help Stats :( Interactions and Homoscedasticity

    IF anyone could help with this right now would appreciate it so much - have tried looking it up anywhere and finding so many different...

    Started by janeduluth‎, 03-22-2008 02:39 PM
    • Replies: 1
    • Views: 4,470
    03-26-2008, 10:33 AM Go to last post
  9. A question about bimodality.

    First question - if my Y variable has a bimodal distribution, is it at all possible to run a regression on this variable? Second - if my Y...

    Started by aquietplace‎, 03-29-2008 01:22 PM
    • Replies: 1
    • Views: 2,154
    03-29-2008, 01:24 PM Go to last post
  10. Spearmans test...?!

    Im conducting a project and it is based on radiographs, basically i look at a radiograph and decide how difficult it is likely to be i have done this...

    Started by Rara‎, 03-29-2008 08:59 AM
    • Replies: 8
    • Views: 2,902
    03-29-2008, 01:29 PM Go to last post
  11. Help with analysis. PLEASE.

    Hi all:wave: , please can any one give an indication of which stats test to use. So far I've looked at doing a bivariate and found significant data,...

    Started by georgemac‎, 03-29-2008 07:55 PM
    • Replies: 7
    • Views: 2,668
    03-30-2008, 03:28 PM Go to last post
  12. Question Can "infinite" values be used in regression?

    Hello, I am analyzing a series of plots along a recovery gradient, using "time since disturbance" as a continuous variable. I want to see how...

    Started by GiganD‎, 04-03-2008 03:21 PM
    • Replies: 4
    • Views: 4,248
    04-07-2008, 01:50 PM Go to last post
  13. Urgent: Linear Regression - Survey Design - Help needed

    Hi everyone, For my master thesis, I am trying to prepare a survey on key success factors for virtual worlds. I want to do a linear regression...

    Started by Lisaly2345‎, 04-10-2008 10:28 AM
    • Replies: 5
    • Views: 3,662
    04-16-2008, 03:28 AM Go to last post
  14. Dissertation help with Likert scale

    Hello, I'm having some problems with the stats for my dissertation. My dissertation is about the effect of the physical surroundings of a...

    Started by Bunecarera‎, 04-15-2008 05:28 AM
    • Replies: 9
    • Views: 11,535
    04-16-2008, 01:27 PM Go to last post
  15. Doubt regarding Multiple Regression

    Hi, I have some doubt in Multiple regression. I have Y as the dependent variable (mutual fund returns) I have many independent variables...

    Started by akshay_ajmani‎, 04-20-2008 03:40 PM
    • Replies: 2
    • Views: 3,045
    04-24-2008, 01:13 PM Go to last post
  16. Regression Analysis

    I am looking for a Introductory Regression Analysis book. The extent of my education is Elementary Stats in college, is there more knowledge, of...

    Started by frailjar7‎, 05-25-2008 07:33 AM
    • Replies: 1
    • Views: 2,519
    05-25-2008, 08:59 AM Go to last post
  17. Damage Assessment

    I apologize for this question being exceedingly vague, but I'm not sure of the correct terminology. After running a regression analysis, I have...

    Started by DCohen‎, 05-23-2008 03:17 PM
    • Replies: 4
    • Views: 3,054
    05-25-2008, 09:07 AM Go to last post
  18. multiple comparisons with multiple regressions?

    Hi there, I'm hoping that someone can answer my query or point me in the direction of a reliable source to find out more. My question is - Is the...

    Started by meema‎, 05-26-2008 09:23 AM
    • Replies: 3
    • Views: 3,365
    05-27-2008, 08:36 AM Go to last post
  19. Regression analysis - normal distribution and linearity

    I am using a scale for a paper. The scores are based on 7 questions with Likert-type responses. I want to use it as a dependent variable in a...

    Started by Staticia‎, 05-29-2008 08:32 AM
    • Replies: 0
    • Views: 4,065
    05-29-2008, 08:32 AM Go to last post
  20. Increasing variance in linear regression

    Hi, I have a response and a predictor variable, weight and height, to which I've fitted a linear regression. The relationship appears to be...

    Started by Statstastic‎, 05-28-2008 10:26 AM
    • Replies: 6
    • Views: 12,605
    05-29-2008, 09:33 AM Go to last post
  21. Multiple Regression Equation.

    Can someone please tell me if this if correct or not. I'm such an idiot. if i have coefficients of : intercept = -17.514 Food =-0.351...

    Started by el1‎, 05-29-2008 07:57 PM
    • Replies: 0
    • Views: 2,597
    05-29-2008, 07:57 PM Go to last post
  22. Repeated measures in EEG.

    Hello, I am currently working on the analysis of an EEG data set. We measured the EEG signal for 170 verbs and 24 subjects in a picture naming...

    Started by SomeLinguist‎, 06-12-2008 07:07 AM
    • Replies: 0
    • Views: 3,895
    06-12-2008, 07:07 AM Go to last post
  23. multiple regression model

    I think 'C' is the answer.. does it look reasonable?

    Started by wasupbaby2‎, 06-12-2008 04:33 PM
    • Replies: 1
    • Views: 2,512
    06-12-2008, 05:19 PM Go to last post
  24. statistics problem

    I am stumped on how to go about making the test statistic for this problem. Any help would be appreciated. Thank you. Suppose that you would like...

    Started by rambo67‎, 06-11-2008 09:17 PM
    • Replies: 7
    • Views: 4,321
    06-12-2008, 05:56 PM Go to last post
  25. F-Statistic Question

    I'm sorry for probably asking a foolish question, but my searches have yielded very limited results (as well as my reading) in regards to the...

    Started by dfrisch‎, 05-28-2008 12:30 PM
    • Replies: 6
    • Views: 25,110
    06-23-2008, 03:28 PM Go to last post
  26. Regression questions

    I have answered the questions below can someone please check them to make sure i have them right. I have answered the questions but need to have...

    Started by CREATIONS‎, 06-27-2008 01:29 AM
    • Replies: 2
    • Views: 22,935
    06-27-2008, 09:27 AM Go to last post
  27. Exclamation Coefficients and standard deviations

    Hi, I have seen in a paper that the author states that the coefficient he gets in a regression implies that an increase of one standard deviation...

    Started by bobesp‎, 07-02-2008 03:52 PM
    • Replies: 2
    • Views: 10,916
    07-05-2008, 04:58 PM Go to last post
  28. Unhappy Very basic questions on some terms.

    I apologize if this is a little too basic for you, but I'm an RN taking statistics ovr the summer and my brain just doesn't work like this. My...

    Started by smarge117‎, 07-12-2008 03:50 PM
    • Replies: 6
    • Views: 2,964
    07-13-2008, 07:25 PM Go to last post
  29. Question effect size in hierarchical multiple regression (categorical predictor)

    Hello all So glad to have found this useful forum and have already gotten some clarity on other issues related to the hierarchical regression...

    Started by sybil‎, 07-30-2008 01:23 PM
    • Replies: 0
    • Views: 4,419
    07-30-2008, 01:23 PM Go to last post
  30. Meaning of T-Ratio and parameter standard error in HLM analysis

    Hello. I've recently used an Hierachical Linear Modeling (HLM aka mixed modeling) analysis method to look at some data. I'm only just beginning to...

    Started by jonblazn‎, 07-31-2008 11:38 AM
    • Replies: 2
    • Views: 17,430
    08-02-2008, 10:34 PM Go to last post
  31. Multiple Regression

    Hi, I am doing regression for dependent variable Y and independent variables X1, X2, X3 and X4. Y is the weekly stock price of a company which...

    Started by a_quantum‎, 08-04-2008 03:00 AM
    • Replies: 4
    • Views: 2,610
    08-06-2008, 03:39 AM Go to last post
  32. consulting help needed (will pay)

    In about a month, I will be in need of help on some statistical analyses in the following areas: -categorical data analysis -multiple linear...

    Started by jediclampet‎, 02-19-2008 01:58 PM
    • Replies: 1
    • Views: 2,649
    08-12-2008, 02:41 PM Go to last post
  33. Statistics Help (Invoice Question)

    Please help! The manager of the purchasing department of a large banking organization would like to develop a model to predict the amount of time...

    Started by student00‎, 08-12-2008 02:55 PM
    • Replies: 4
    • Views: 5,766
    08-13-2008, 08:05 PM Go to last post
  34. Help with Multiple Regression

    Hi all, im struggling with what to do with this multiple regression question, any help tips or pointers would be greatly appreciated! Am i...

    Started by Mosphaitus‎, 08-15-2008 08:35 AM
    • Replies: 6
    • Views: 3,742
    08-16-2008, 12:43 PM Go to last post
  35. Post Check and develop my answers, multiple regression

    This is the question, i was wondering if anyone could check if i did the correct thing, and help me develop my written answers if needed. a)...

    Started by Mosphaitus‎, 08-17-2008 08:22 AM
    • Replies: 4
    • Views: 6,896
    08-17-2008, 12:49 PM Go to last post
  36. how to enter certain data, and should i use t test?

    Hi all,:wave: I'm new here and need life saving help with my MEd dissertation! I'm studying moral development (SRMS SCORE) and play opportunities...

    Started by ladyt‎, 08-16-2008 08:10 AM
    • Replies: 2
    • Views: 5,470
    08-18-2008, 04:38 AM Go to last post
  37. Centering and transforming

    Hello, I'm performing a multiple regression analysis and have a question about transforming variables. I am using two IVs to see if there are...

    Started by statishtics‎, 08-27-2008 03:45 PM
    • Replies: 1
    • Views: 3,025
    08-28-2008, 05:05 AM Go to last post
  38. very basis question

    Hi guys, one very basic question: what is the actual difference between simple linear regression and univariate analysis? examples would be...

    Started by nelson‎, 08-31-2008 11:57 AM
    • Replies: 3
    • Views: 3,004
    09-01-2008, 08:25 AM Go to last post
  39. Number of IV's in multiple regressions: How many is 'too many'?

    Hello I need to run a number of individual regressions and am trying to decide how to break them down. I was wondering whether there is a limit...

    Started by gemma7‎, 09-02-2008 07:00 AM
    • Replies: 2
    • Views: 4,366
    09-02-2008, 03:51 PM Go to last post
  40. Prediction Limits

    Morning everyone. First thread, so take it easy on me. I am using a holt-winters times series to predict future call and transactional volume. ...

    Started by andrew01‎, 09-03-2008 06:48 AM
    • Replies: 0
    • Views: 3,399
    09-03-2008, 06:48 AM Go to last post
  41. Unhappy Unstandardized regression coefficient in Multiple Regression Interaction

    Hi all, I am trying to interpret a significant cross product interaction in a Multiple Regression and I am getting more and more confused. There...

    Started by suliman‎, 09-05-2008 11:57 PM
    • Replies: 1
    • Views: 9,293
    09-06-2008, 01:01 AM Go to last post
  42. A quick regression QUESTION

    Hi i just have a really simple question regarding multiple regression. i have a independant variable called DPR that is the dividend payout ratio...

    Started by pad1w07@soton.ac.uk‎, 09-15-2008 12:06 PM
    • Replies: 2
    • Views: 2,782
    09-16-2008, 03:10 AM Go to last post
  43. Simple CORRELATION query

    hi. i am analysing my data using a correlation matrix, and then multiple regression. I have noticed that some of my correlation co-effecients are...

    Started by pad1w07@soton.ac.uk‎, 09-19-2008 03:40 AM
    • Replies: 1
    • Views: 2,297
    09-19-2008, 12:11 PM Go to last post
  44. URGENT POOLD OLS regression

    ok basically heres the deal. ive used OLS multiple regression on panel data (so ive used a pooled OLS regression.) what i want to know is whats...

    Started by pad1w07@soton.ac.uk‎, 09-20-2008 12:25 PM
    • Replies: 0
    • Views: 2,037
    09-20-2008, 12:25 PM Go to last post
  45. brain freeze.....

    im having a really stupid moment, but what does it mean when a multiple regression coeffecient is insignificant. say hair colour is found to be...

    Started by pad1w07@soton.ac.uk‎, 09-22-2008 06:07 AM
    • Replies: 1
    • Views: 2,322
    09-22-2008, 09:15 AM Go to last post
  46. AM I allowed to do this?

    Basically i have a binary variable called DP ( takes values 0 or 1) that i had to drop from my multiple regression due to few observations with of...

    Started by pad1w07@soton.ac.uk‎, 09-18-2008 07:36 AM
    • Replies: 1
    • Views: 2,267
    09-22-2008, 06:06 PM Go to last post
  47. Question Testing suppression with SEM

    hey everybody Using multiple regression analysis on my data, I've discovered a suppression effect. Now I started analyzing the same data with...

    Started by piweli‎, 09-04-2008 04:30 AM
    • Replies: 1
    • Views: 6,299
    09-30-2008, 10:27 AM Go to last post
  48. Repeated measures - appropriate for my study or not?

    Howdy folks - first time poster here. I'm a grad student at CU-Boulder working on grassland ecology and need some assistance. I've got six...

    Started by Charlie‎, 10-09-2008 01:58 PM
    • Replies: 1
    • Views: 2,797
    10-10-2008, 01:23 AM Go to last post
  49. Issues with using composites in linear regression?

    Hi, What sort of issues do I need to consider if I include composites as independent variables in a linear regression? (The composites are averages...

    Started by jts‎, 10-14-2008 10:05 PM
    • Replies: 0
    • Views: 2,389
    10-14-2008, 10:05 PM Go to last post
  50. Help!

    Hi, I'm in the social sciences (psych) using cross sectional data. I'm completing a multiple hierarchical regression looking at interaction...

    Started by statishtics‎, 10-15-2008 05:12 PM
    • Replies: 3
    • Views: 2,173
    10-16-2008, 07:49 AM Go to last post
  51. Standard Deviation or Response / Prediction - Linear Regression

    Hi, I'm hoping someone out there can help me with what is probably a very simple question. For a stats assignment, I've created a linear...

    Started by dzeni‎, 10-05-2008 06:28 PM
    • Replies: 4
    • Views: 11,484
    10-20-2008, 04:47 AM Go to last post
  52. Is there any limitation on number of predictors if I run stepwise linear regression

    Hi... I need help to solve a problem actually i want to do stepwise linear regression and my predictors are 2279 (differenct combinations of soil...

    Started by Mobushir riaz Khan‎, 10-21-2008 02:40 PM
    • Replies: 0
    • Views: 2,467
    10-21-2008, 02:40 PM Go to last post
  53. multiple comparison issue in linear regression

    I am puzzled by the following question: If you have a 3-level categorical predictor in a linear regression model, you will get 2 estimated...

    Started by nahh‎, 11-05-2008 04:41 PM
    • Replies: 0
    • Views: 2,941
    11-05-2008, 04:41 PM Go to last post
  54. Factor analysis with non-normal distribution?

    Hi all, Does anyone know an alternative to factor anlysis for non-normal distrbutions which explores factors or clusters on a set of 64...

    Started by Wiggy‎, 11-06-2008 05:59 AM
    • Replies: 3
    • Views: 16,324
    11-06-2008, 02:26 PM Go to last post
  55. calculating multiple regression by hand

    How would you calculate a regression equation such as Y = b1X1 + b2X2 + b3X3 + a by HAND??? I can find in textbooks the way to calculate two...

    Started by HCrazy‎, 11-10-2008 11:52 PM
    • Replies: 1
    • Views: 23,408
    11-11-2008, 12:04 AM Go to last post
  56. Calculations for the unstandardized coefficients for a multiple regression analysis

    I am looking to write a spreadsheet of the calculations for the unstandardized coefficients for a multiple regression analysis (the B values). ...

    Started by Baggies‎, 11-10-2008 03:54 AM
    • Replies: 3
    • Views: 18,966
    11-11-2008, 04:53 AM Go to last post
  57. Muliple regression - lets try again

    I posted a question earlier (variable transformation) and am wondering if I didn't explain myself very well. Here's a more straighforward and paired...

    Started by statishtics‎, 08-20-2008 01:30 PM
    • Replies: 2
    • Views: 2,640
    11-13-2008, 07:26 PM Go to last post
  58. Two-way ANOVA...or not?

    The following data is observed by a building society: No of mortgage applications per month Year 1989 1990 1991 1992 AVERAGE Season...

    Started by sashimi‎, 11-16-2008 06:04 AM
    • Replies: 0
    • Views: 2,203
    11-16-2008, 06:04 AM Go to last post
  59. Help needed with ANOVA analysis

    ANOVA df SS MS F Significance F Regression 6 5510.4 918.4 11.67 0.0081 Residual 5 393.2 78.65 Total ...

    Started by d.g.aspinall‎, 11-17-2008 07:46 PM
    • Replies: 1
    • Views: 5,068
    11-18-2008, 03:32 PM Go to last post
  60. Independent variables correlate to each other: violation of regression assumoptions?

    Ok, so bear with me - total statistical idiot here, in way over his head. I'm running multiple regressions of plant cover against precipitation,...

    Started by Charlie‎, 11-13-2008 03:37 PM
    • Replies: 11
    • Views: 13,602
    11-19-2008, 10:17 AM Go to last post

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