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Forum: Regression Analysis

Linear regression, linear models, nonlinear regression

  1. pearson correlation in linear mixed models?

    Hi, I'm trying to understand a research article that used linear mixed models, and I think they have done something wrong. Basically, the...

    Started by williaml‎, 02-24-2009 05:50 AM
    • Replies: 0
    • Views: 2,330
    02-24-2009, 05:50 AM Go to last post
  2. This simple linear regression isn't adding up..

    Edit/Cliffnotes: CORRECTION- The second SSR formula in question is SSR = SUM((yhat(i) - ybar)^2), not SSR = SUM((y(i) - ybar)^2). Dragan resolved my...

    Started by Math Adventures‎, 02-18-2009 08:40 PM
    • Replies: 2
    • Views: 2,730
    02-18-2009, 10:19 PM Go to last post
  3. three way interactions and centering in multiple regression

    Hello, I am examining three variables to see whether they interact with each other to predict my DV using multiple regression. I typically center my...

    Started by psychologygirl‎, 02-14-2009 10:07 PM
    • Replies: 4
    • Views: 3,192
    02-16-2009, 08:43 PM Go to last post
  4. Question About a Seemingly Invalid Sampling

    Hi, I was wondering if someone can help me with the following question: Suppose that we were interested in the effects of a prep course on SAT...

    Started by snipez‎, 02-15-2009 03:30 AM
    • Replies: 1
    • Views: 1,300
    02-15-2009, 03:35 PM Go to last post
  5. multiple comparisons

    Hi, I'm a vet doing a research project, but am not really strong in stats. I have a question about whether correction for multiple comparisons is...

    Started by jknuppel‎, 02-09-2009 09:13 PM
    • Replies: 8
    • Views: 2,367
    02-13-2009, 02:12 AM Go to last post
  6. Percentage/proportion prediction interval

    Hi, anyone could help with this: we know that with a considerably large sample we can estimate what is the proportion of cases having a certain...

    Started by Johngr55‎, 02-09-2009 12:38 PM
    • Replies: 1
    • Views: 2,357
    02-09-2009, 01:00 PM Go to last post
  7. Comparing regression equations

    I am thinking of trying to use the logit model to determine the probability of whether patients will participate in a particular health program. My...

    Started by Clouds1988‎, 02-07-2009 07:35 PM
    • Replies: 2
    • Views: 2,209
    02-08-2009, 11:31 AM Go to last post
  8. Linear Regression Models

    I am being asksed if an equation is linear in the paramenters or variables and I am a bit lost. I understand that for something to be linear it cant...

    Started by ajmax01‎, 02-01-2009 12:19 AM
    • Replies: 1
    • Views: 1,725
    02-01-2009, 10:04 AM Go to last post
  9. Risk Model Re-Weighting Help Needed

    Long story somewhat short My company uses a risk model with 10+ variables. Each of these variables is weighted according to the risk it...

    Started by Forty6ixAnd2‎, 01-19-2009 08:52 PM
    • Replies: 2
    • Views: 1,661
    01-28-2009, 03:13 PM Go to last post
  10. "Best" Multiple (Multivariate) Nonlinear Regression?

    Hi all, I'm just getting started in R. I've had good luck finding the right (predictive) correlation weights using orthogonal polynomials in Java....

    Started by Axl‎, 01-21-2009 05:58 PM
    • Replies: 2
    • Views: 2,913
    01-22-2009, 03:05 PM Go to last post
  11. Stats analysis help would be very much appreciated

    I have carried out some research. The research involved respondents filling in a questionnaire of 62 questions. Answers were on a scale - Strongly...

    Started by oakmoss‎, 01-18-2009 09:32 AM
    • Replies: 4
    • Views: 2,114
    01-20-2009, 06:33 AM Go to last post
  12. Logistic regression or DFA?

    Hi! I am trying to get my masters thesis done. I am taking a statistics course right now, but I need to get started on things sooner rather than...

    Started by Merlion‎, 01-14-2009 10:52 PM
    • Replies: 3
    • Views: 4,301
    01-15-2009, 08:43 AM Go to last post
  13. Unbalanced Sample Sizes

    Given two variables: one is a single estimate measured on one individual, the other is comprised of multiple samples taken from the same individuals...

    Started by scoter‎, 01-12-2009 05:06 PM
    • Replies: 0
    • Views: 2,094
    01-12-2009, 05:06 PM Go to last post
  14. Statistical Significance

    I am completing a statistics project having been given data for 30 years. I have calculated the pairwise correlation coefficients between Infant...

    Started by shanny9‎, 01-04-2009 07:22 AM
    • Replies: 2
    • Views: 1,926
    01-04-2009, 03:42 PM Go to last post
  15. Unhappy multiple regression analysis on likertscale

    Dear All, I am doing the analysis of my data obtained through a questionaire. i want to find the relationship of different forms justice...

    Started by Mobushir riaz Khan‎, 12-22-2008 10:18 AM
    • Replies: 1
    • Views: 1,545
    12-24-2008, 07:46 AM Go to last post
  16. Linear regression

    Hi all I was given a data sample of 35 countries which included the country name,the number of railways and the number of airports in the given...

    Started by gloew‎, 12-19-2008 04:44 AM
    • Replies: 6
    • Views: 2,246
    12-23-2008, 06:09 PM Go to last post
  17. Multiple logistic Regression Power Analysis

    Hi to everybody, Please does anybody can help me to solve this problem? I have a multiple logistic regression model with more than one BINARY...

    Started by Canyon75‎, 12-20-2008 08:05 AM
    • Replies: 1
    • Views: 3,532
    12-22-2008, 09:04 AM Go to last post
  18. Hlm?

    I am working with a large data set, n = 1200+ average course grades culled from over 15,000 students from a school. I ran a regression using average...

    Started by ewblack‎, 12-09-2008 01:23 PM
    • Replies: 9
    • Views: 3,568
    12-17-2008, 12:21 PM Go to last post
  19. Binary Logistic Regression in R

    Warning: this is going to be a long post. Acknowledgement: Thanks to The Ecologist for getting me started on what I hope is the right road. This...

    Started by jerh‎, 12-04-2008 11:10 AM
    2 Pages
    1 2
    • Replies: 24
    • Views: 19,274
    12-16-2008, 03:21 AM Go to last post
  20. adjusting a proportion score (controling for age)

    I have 20 yes/no ratings (did this product help you). People were able to rate as many of the 20 products as they used (on average people rated 5...

    Started by chinaplate‎, 12-15-2008 10:19 PM
    • Replies: 8
    • Views: 3,010
    12-15-2008, 11:23 PM Go to last post
  21. ANOVA confusions- Please Help

    Hello, I was wondering if you could please offer any advice as I appear to have got rather muddled. I am writing a resesarch proposal, and I...

    Started by GuineaPig‎, 12-09-2008 03:35 PM
    • Replies: 8
    • Views: 2,115
    12-10-2008, 11:14 PM Go to last post
  22. Can you guys check these for me

    Shade answers to T/F questions and type letter answer to multiple choice questions next to problem number. Chapters 13 & 14 included. T F 1. If a...

    Started by Bicano‎, 12-08-2008 11:07 AM
    • Replies: 1
    • Views: 3,767
    12-08-2008, 03:33 PM Go to last post
  23. Question Multiple Regression & Multiple Linear Regression: 2 Qu's

    I know these are 2 very basic question, but if someone could please confirm them for me I'd be very grateful indeed: 1. Am I correct in thinking...

    Started by gemma7‎, 08-31-2008 08:49 AM
    • Replies: 4
    • Views: 9,460
    12-05-2008, 03:40 PM Go to last post
  24. price determination prediction

    Its been 2 years since my last statistics class. I did fairly well but the material isn't so fresh since I haven't had to use it. I am writting a...

    Started by mikeo1313‎, 12-01-2008 02:56 AM
    • Replies: 1
    • Views: 1,395
    12-01-2008, 03:14 AM Go to last post
  25. Did i get theese right i am confused, can anyone help me please

    25. In multiple regression analysis, residual analysis is used to test the requirement that A) the variation in the residuals is the same for all...

    Started by Bicano‎, 11-30-2008 08:26 PM
    • Replies: 2
    • Views: 19,374
    11-30-2008, 09:08 PM Go to last post
  26. Testing for difference 2 regression models

    Hello, I am working on multiple regressions at the moment and have come to a point that I need a little assistance. I have the following question:...

    Started by devreede‎, 11-28-2008 12:16 PM
    • Replies: 8
    • Views: 22,436
    11-29-2008, 11:29 AM Go to last post
  27. Looking for mult. linear regression equations

    Hi - I'm having trouble finding the equations for the coefficients for a multiple linear regression with two independent variables (a=, b1=, b2=). ...

    Started by dave25‎, 11-26-2008 07:28 PM
    • Replies: 1
    • Views: 1,926
    11-26-2008, 08:13 PM Go to last post
  28. Cool Multiple Regression with Multiple Groups

    Hello, I am looking at predictor variables (scores on partner perception measures) on a criterion variable (relationship satisfaction), in order to...

    Started by Shadow3758‎, 11-26-2008 05:35 PM
    • Replies: 9
    • Views: 3,871
    11-26-2008, 06:58 PM Go to last post
  29. 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: 11,931
    11-19-2008, 10:17 AM Go to last post
  30. 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: 2,929
    11-18-2008, 03:32 PM Go to last post
  31. 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: 1,295
    11-16-2008, 06:04 AM Go to last post
  32. 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: 1,703
    11-13-2008, 07:26 PM Go to last post
  33. 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: 15,808
    11-11-2008, 04:53 AM Go to last post
  34. 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: 17,903
    11-11-2008, 12:04 AM Go to last post
  35. 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: 12,565
    11-06-2008, 02:26 PM Go to last post
  36. 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: 1,939
    11-05-2008, 04:41 PM Go to last post
  37. 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: 1,398
    10-21-2008, 02:40 PM Go to last post
  38. 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: 9,316
    10-20-2008, 04:47 AM Go to last post
  39. 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: 1,433
    10-16-2008, 07:49 AM Go to last post
  40. 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: 1,375
    10-14-2008, 10:05 PM Go to last post
  41. 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: 1,805
    10-10-2008, 01:23 AM Go to last post
  42. 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: 4,672
    09-30-2008, 10:27 AM Go to last post
  43. 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: 1,484
    09-22-2008, 06:06 PM Go to last post
  44. 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: 1,461
    09-22-2008, 09:15 AM Go to last post
  45. 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: 1,495
    09-20-2008, 12:25 PM Go to last post
  46. 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: 1,629
    09-19-2008, 12:11 PM Go to last post
  47. 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: 1,649
    09-16-2008, 03:10 AM Go to last post
  48. 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: 7,388
    09-06-2008, 01:01 AM Go to last post
  49. 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: 1,693
    09-03-2008, 06:48 AM Go to last post
  50. 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: 2,730
    09-02-2008, 03:51 PM Go to last post
  51. 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: 1,656
    09-01-2008, 08:25 AM Go to last post
  52. 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: 1,695
    08-28-2008, 05:05 AM Go to last post
  53. 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: 3,072
    08-18-2008, 04:38 AM Go to last post
  54. 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: 4,633
    08-17-2008, 12:49 PM Go to last post
  55. 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: 2,542
    08-16-2008, 12:43 PM Go to last post
  56. 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: 4,048
    08-13-2008, 08:05 PM Go to last post
  57. 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: 1,559
    08-12-2008, 02:41 PM Go to last post
  58. 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: 1,710
    08-06-2008, 03:39 AM Go to last post
  59. 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: 14,473
    08-02-2008, 10:34 PM Go to last post
  60. 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: 3,354
    07-30-2008, 01:23 PM Go to last post

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