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Forum: Regression Analysis

Linear regression, linear models, nonlinear regression

  1. 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 09:59 AM
    • Replies: 8
    • Views: 1,815
    03-29-2008, 02:29 PM Go to last post
  2. 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 02:22 PM
    • Replies: 1
    • Views: 1,342
    03-29-2008, 02:24 PM Go to last post
  3. 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 03:39 PM
    • Replies: 1
    • Views: 2,715
    03-26-2008, 11:33 AM Go to last post
  4. 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 01:06 PM
    • Replies: 3
    • Views: 6,081
    03-25-2008, 04:58 PM Go to last post
  5. 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 12:50 PM
    • Replies: 3
    • Views: 4,272
    03-20-2008, 04:09 PM Go to last post
  6. 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 02:25 PM
    • Replies: 3
    • Views: 1,554
    03-20-2008, 12:38 PM Go to last post
  7. 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 04:06 PM
    • Replies: 0
    • Views: 1,603
    03-10-2008, 04:06 PM Go to last post
  8. 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: 2,725
    03-07-2008, 04:10 PM Go to last post
  9. 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: 2,558
    02-20-2008, 09:00 AM Go to last post
  10. 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: 4,681
    02-17-2008, 02:13 PM Go to last post
  11. Chi vs R for goodness of fit

    As an undergraduate, I had a physics professor who strongly preferred chi^2 as a measure of a good curve-fit as opposed to correlation coefficient r....

    Started by MALDATA‎, 02-12-2008 01:00 PM
    • Replies: 1
    • Views: 1,545
    02-16-2008, 05:10 PM Go to last post
  12. means versus total scores

    Hi I have a question about using means versus total scores. Is it better to use one or the other when conducting analyses like multiple regression...

    Started by psychologygirl‎, 02-09-2008 12:25 PM
    • Replies: 0
    • Views: 1,205
    02-09-2008, 12:25 PM Go to last post
  13. Multiple Regression Analysis of a time series

    Hello everyone! I'm trying to use multiple regression analysis of a time series, but I've run into a problem interpreting the data. First, I've...

    Started by minchazo‎, 02-04-2008 05:48 PM
    • Replies: 0
    • Views: 3,573
    02-04-2008, 05:48 PM Go to last post
  14. Multiple regression analysis

    Hi I was wondering if anyone can help me regarding multiple regression analysis. I have used the Stats program Minitab to analyse a large amount of...

    Started by Deanne‎, 02-03-2008 12:13 AM
    • Replies: 1
    • Views: 1,489
    02-04-2008, 03:26 PM Go to last post
  15. learning logistic regression

    If you're really good at multiple linear/non-linear regression analysis, would it be hard to learn how to do a logistic regression? Is that a lot...

    Started by Analytics‎, 01-20-2008 10:50 PM
    • Replies: 1
    • Views: 1,354
    01-21-2008, 03:12 AM Go to last post
  16. what I dont get about statistical techniques!

    I bought and read a book about multiple regression analysis (least squares) and it contains tests for each assumptions and not just linear models,...

    Started by Analytics‎, 01-11-2008 10:34 PM
    • Replies: 0
    • Views: 1,406
    01-11-2008, 10:34 PM Go to last post
  17. statistical analysis of global warming/fossil fuels

    Hello, I have to write a paper for a class (environmental management). I've been thinking quite a bit about global warming/weather trends and how...

    Started by Analytics‎, 01-11-2008 08:14 PM
    • Replies: 0
    • Views: 1,970
    01-11-2008, 08:14 PM Go to last post
  18. Mallow's Cp Statistic as criterion for regression

    I am building a multiple regression model using stepwise procedures and using the minimum Mallow's CP statistic as criterion for adding variables to...

    Started by johng16‎, 09-20-2006 09:14 PM
    • Replies: 2
    • Views: 19,984
    01-07-2008, 06:58 AM Go to last post
  19. What's a logistic regression?

    Hello, in college we learned multiple regression techniques (different models: linear, log-lin, lin-log, exponential, ...) - including all the...

    Started by Analytics‎, 12-24-2007 05:34 PM
    • Replies: 4
    • Views: 3,423
    12-30-2007, 05:45 PM Go to last post
  20. Red face Combining Regressions

    Hi, I have several different regressions for various sites within an area estimating Y from X. I would like to combine all these sites in to...

    Started by danboyk‎, 12-19-2007 10:01 AM
    • Replies: 3
    • Views: 4,932
    12-28-2007, 11:31 AM Go to last post
  21. Need your help with AIC and model selection

    Hello. If someone could help me with this problem, I would really appreciate it!! I am working on multiple Mantel tests (like multiple regression)....

    Started by fsms‎, 12-05-2007 03:56 AM
    • Replies: 1
    • Views: 1,878
    12-06-2007, 02:14 PM Go to last post
  22. Cluster Analysis

    Hi all, I have a small sample of 75 participants. I'm conducting an exploratory study looking at psychological distress and gender role...

    Started by cmuhooligan‎, 11-29-2007 11:26 AM
    • Replies: 0
    • Views: 1,494
    11-29-2007, 11:26 AM Go to last post
  23. Exclamation Regression & Predictions

    I have a problem to work out involving forecasting/predicting: Given multiple data sets (variables), I need to evaluate which set is the best...

    Started by corrinebean‎, 11-25-2007 07:15 PM
    • Replies: 1
    • Views: 1,490
    11-26-2007, 04:10 AM Go to last post
  24. Question Regression Analysis Assignment

    :confused: hi all! I'm new here but I sort of need some help. I have this regression analysis assignment to do using SPSS and stats knowledge...

    Started by Laurence‎, 11-05-2007 09:44 AM
    • Replies: 0
    • Views: 3,045
    11-05-2007, 09:44 AM Go to last post
  25. Regression and metric space

    Hi, I have two independent variables X and Y and one dependent variable Z. X alone explains 45 percent of the variation in Z (Rsquare) and Y...

    Started by senbet‎, 10-29-2007 04:40 PM
    • Replies: 0
    • Views: 1,349
    10-29-2007, 04:40 PM Go to last post
  26. More than 1 squared term in a regression equation?

    If I have a multiple regression model in which there are more than 1 or 2 terms that are non-linear with the dependent variable Y, then what can I do...

    Started by enman‎, 10-19-2007 12:34 PM
    • Replies: 0
    • Views: 1,770
    10-19-2007, 12:34 PM Go to last post
  27. Significance Issue in Regression

    Hi everyone! I have a statistical question that I hope someone can answer. I am doing a research about relationship between satisfaction and...

    Started by Mikica‎, 08-26-2007 08:14 AM
    • Replies: 9
    • Views: 2,395
    08-29-2007, 04:17 PM Go to last post
  28. Multicollinearity

    Hello at everyone, I'm new at the site, and I'd appreciate your suggestions. I have a multiple -through the origin- regression model. Working with...

    Started by hernan‎, 08-24-2007 07:13 PM
    • Replies: 2
    • Views: 4,484
    08-24-2007, 07:49 PM Go to last post
  29. generalized least squares

    Hello. How can I modify least square linear regression method in order to fit a straight line to data with non gaussian error (such as Levy, Poisson...

    Started by skan‎, 07-29-2007 02:21 PM
    • Replies: 6
    • Views: 2,109
    08-02-2007, 06:53 AM Go to last post
  30. Weightings Problem

    I have been given an EXCEL model and my assigned task is (only) to fix it for problems that I might call "unintended consequences" of the underlying...

    Started by deanalt‎, 07-16-2007 10:32 PM
    • Replies: 4
    • Views: 1,871
    07-19-2007, 03:33 PM Go to last post
  31. Interactions in regression analysis

    Is their anyone who knows how to identify interactions between independent variables in a regression analysis? How does one use the output...

    Started by firefly‎, 06-08-2007 09:30 AM
    • Replies: 5
    • Views: 3,548
    06-09-2007, 10:42 PM Go to last post
  32. Need my answers checked.. Am I right? Fingers crossed : )

    Hey everyone, tomororw morning I am doing a statisctics exam but I had a few questions before I go in there. I have been reviewing the slides from...

    Started by crunchy‎, 05-15-2007 07:00 PM
    • Replies: 0
    • Views: 1,334
    05-15-2007, 07:00 PM Go to last post
  33. Regression Analysis Non linear estimation using squares

    Hi, I have used Gompertz model to estimate an equation. I have followed these two sites they explain it all. ...

    Started by vladinator‎, 04-30-2007 04:01 AM
    • Replies: 1
    • Views: 1,648
    04-30-2007, 10:01 PM Go to last post
  34. Anova problems.........please help.thank you

    1.A study has been conducted to determine whether the mean spending for recreational activities during the month of August differs for residents of...

    Started by adeola1820‎, 04-23-2007 01:20 AM
    • Replies: 0
    • Views: 1,965
    04-23-2007, 01:20 AM Go to last post
  35. Ancova

    Hello, I'm trying to compare regression models of the same form between three groups. Each model has two continuous independent variables. I need...

    Started by gysr‎, 04-17-2007 10:23 AM
    • Replies: 0
    • Views: 1,362
    04-17-2007, 10:23 AM Go to last post
  36. Mutliple Regression with a known coefficient

    I'm performing multiple regression on a linear model with several independent variables to generate equations such as: W = aX + bY + cZ X = dW +...

    Started by lfalin‎, 02-05-2007 08:26 AM
    • Replies: 1
    • Views: 2,230
    02-05-2007, 05:27 PM Go to last post
  37. Interaction variable in regression

    I'm analyzing data from an experiment in which there are two groups of subjects (patients and controls), and in each group the independent variable...

    Started by rak128‎, 01-31-2007 02:28 PM
    • Replies: 0
    • Views: 1,664
    01-31-2007, 02:28 PM Go to last post
  38. How to develop a regression expression using factor scores?

    Hi, I have four factors for fourteen variables. I want to develop a regression expression for a dependent variable using the correlated variables....

    Started by aceprod51‎, 01-21-2007 03:22 PM
    • Replies: 1
    • Views: 2,911
    01-23-2007, 10:05 PM Go to last post
  39. Doing logistic regression using epi-info

    Hi there! I'd really appreciate help with this one. I'm finding the prevalence of anemia and its determinants. There are about 23 factors that...

    Started by confusedmedstudent‎, 12-10-2006 05:01 AM
    • Replies: 0
    • Views: 4,128
    12-10-2006, 05:01 AM Go to last post
  40. dummy coding help for cat variables

    I have a questionnaire with 28 items - 20 items are Likert attitude questions. In fact there are 5 main variables (constructs?) being measured by 4...

    Started by ehb23‎, 12-06-2006 07:26 PM
    • Replies: 0
    • Views: 2,214
    12-06-2006, 07:26 PM Go to last post
  41. Help with prediction interval problem

    Construct the indicated prediction interval for an individual y. The equation of the regression line for the paired data below is = 3x and the...

    Started by maharriso‎, 11-13-2006 02:50 PM
    • Replies: 0
    • Views: 3,321
    11-13-2006, 02:50 PM Go to last post
  42. Multiple Regression Analysis

    Hi there, i would need some advice with regards to Multiple regression. Hopefully i have done the analysis in SPSS correctly. I would like to...

    Started by cookies8‎, 10-08-2006 05:08 AM
    • Replies: 1
    • Views: 1,907
    10-08-2006, 06:46 PM Go to last post
  43. Need help selecting statistical test

    I am working on my dissertation proposal and have run into a snag in the analyses section. I am trying to analyze data drawn from two time-points. ...

    Started by psychstudent‎, 09-28-2006 06:47 PM
    • Replies: 2
    • Views: 1,595
    09-29-2006, 03:27 PM Go to last post
  44. Multiple regression help needed

    I am struggling with the concept of a forced entry linear multiple data regression. Could someone please explain what they are, why they are used,...

    Started by southerngirl920‎, 09-05-2006 05:03 PM
    • Replies: 1
    • Views: 4,232
    09-05-2006, 09:27 PM Go to last post
  45. Question Multiple Regression - Interpreting t-stat

    Hi all, If the model fit is satisfactory (ie. R-squared value is sufficiently high), how should the t-stat be interpreted... my reading indicated...

    Started by big-b‎, 08-28-2006 01:22 AM
    • Replies: 1
    • Views: 95,017
    08-29-2006, 02:56 PM Go to last post
  46. My regression has me confused!

    Can someone help me explain this? I did a stepwise multiple regression using the three factors. In Step 3, it shows the Bs in the order I...

    Started by Mcnuggets‎, 08-27-2006 01:49 PM
    • Replies: 2
    • Views: 1,853
    08-29-2006, 10:22 AM Go to last post
  47. Durbin watson

    :confused: :confused: i'm in a big big problem? i'm a demonestrator in medical statistics department this week i have to prepare a seminar about...

    Started by Ghada‎, 08-27-2006 04:34 AM
    • Replies: 0
    • Views: 2,725
    08-27-2006, 04:34 AM Go to last post
  48. Question Linear Regression Equation

    Dear friends, I have a set of data as follows: 1....... 58.823.23 10....... 62.57.90 50....... 87.232.33 100....... 110.2910.33...

    Started by pavnesh‎, 07-27-2006 06:43 AM
    • Replies: 5
    • Views: 2,193
    08-11-2006, 01:24 AM Go to last post
  49. regression, pairs of random variables

    with observations of an x variable, and a y variable whose expected values lie on a straight line, and whose residual errors are normally...

    Started by lhomer‎, 08-06-2006 01:25 PM
    • Replies: 0
    • Views: 1,896
    08-06-2006, 01:25 PM Go to last post
  50. backtranformation of log transformed data

    Hi forum, I've a simple question that has probably a difficult answer. In a lineair regression of the form: log(y) ~ x resulting in an...

    Started by koen‎, 07-25-2006 10:39 AM
    • Replies: 0
    • Views: 1,685
    07-25-2006, 10:39 AM Go to last post
  51. Plz Help!!!!!!!!!!!!!!!!!!!:(

    HEY GUZ CAN U PLZ HELP ME ON THSES @ PROBLEMS< PLZZZ. 1. Please derive solution of parameter estimation for Multiple Linear Regression Model....

    Started by kal‎, 06-11-2006 08:41 PM
    • Replies: 0
    • Views: 1,356
    06-11-2006, 08:41 PM Go to last post
  52. How do I estimate sales given a multiple regression?

    Hi, I'm doing a problem that involves multiple regression. The question asks me to make an estimate of future sales for 15 stores for 2004, given a...

    Started by Emawk‎, 06-05-2006 07:29 PM
    • Replies: 0
    • Views: 1,829
    06-05-2006, 07:29 PM Go to last post
  53. Multiple regression least square estimation

    Can someone show me the equations and the derivation of the least square estimation of multiple linear regression? It would be even greater if...

    Started by byip‎, 05-20-2006 12:44 PM
    • Replies: 0
    • Views: 2,285
    05-20-2006, 12:44 PM Go to last post
  54. Pooling data for multiple regression

    Hi All, :wave: I have a few issues with some collected data. I have been collecting attitude/perception questionaires using likert scales...

    Started by funkymunky‎, 05-12-2006 02:13 PM
    • Replies: 2
    • Views: 3,034
    05-13-2006, 09:43 AM Go to last post
  55. Unsure of which test to use!

    If I want to assess the effects of a number of different factors such as sex, income etc on exam results which statistical test should I use? I have...

    Started by jagsman‎, 05-04-2006 09:01 PM
    • Replies: 4
    • Views: 1,717
    05-06-2006, 02:42 PM Go to last post
  56. 2SLS - endogeneity issue

    I am running a regression on the relationship between aid inflows and investment levels in developing countries. One obvious other explanatory...

    Started by Alex E‎, 05-01-2006 10:37 AM
    • Replies: 1
    • Views: 2,222
    05-06-2006, 02:40 PM Go to last post
  57. MLR: R2 and RMSE in assessing quality

    How would one judge the quality of a multiple linear regression model if the model had a high value for cross-validated R2 but also a high value for...

    Started by Grateful‎, 04-26-2006 07:35 PM
    • Replies: 1
    • Views: 4,179
    04-26-2006, 09:00 PM Go to last post
  58. Need help with regression statistics analysis

    Hello I need serious help. I did my last project fine. I've followed all my instructions for this final project, and did everything, but the part to...

    Started by HeavenSoldier‎, 04-04-2006 02:46 PM
    2 Pages
    1 2
    • Replies: 20
    • Views: 4,693
    04-19-2006, 11:20 PM Go to last post
  59. Multiple regression?

    Hi, I'm wondering if it is a bad violation to try to conduct a multiple regression analysis if some of the variables are non-parametric? My...

    Started by Mimi Le Rue‎, 04-11-2006 12:00 PM
    • Replies: 4
    • Views: 2,771
    04-13-2006, 10:59 AM Go to last post
  60. Help with easy stats

    Hi guys I desperately need help revising for my STATS module. We have been given practice exam questions but are not given the answers so I can't...

    Started by borgmeister‎, 04-01-2006 05:52 PM
    • Replies: 0
    • Views: 1,558
    04-01-2006, 05:52 PM Go to last post

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