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Forum: Regression Analysis

Linear regression, linear models, nonlinear regression

  1. 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: 4,067
    05-29-2008, 08:32 AM Go to last post
  2. 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: 3,369
    05-27-2008, 08:36 AM Go to last post
  3. 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: 3,059
    05-25-2008, 09:07 AM Go to last post
  4. 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: 2,522
    05-25-2008, 08:59 AM Go to last post
  5. 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: 3,050
    04-24-2008, 01:13 PM Go to last post
  6. 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: 11,542
    04-16-2008, 01:27 PM Go to last post
  7. 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: 3,665
    04-16-2008, 03:28 AM Go to last post
  8. 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: 4,257
    04-07-2008, 01:50 PM Go to last post
  9. 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
  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: 2,903
    03-29-2008, 01:29 PM Go to last post
  11. 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: 2,155
    03-29-2008, 01:24 PM Go to last post
  12. 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: 4,476
    03-26-2008, 10:33 AM Go to last post
  13. 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: 8,615
    03-25-2008, 03:58 PM Go to last post
  14. 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: 6,295
    03-20-2008, 03:09 PM Go to last post
  15. 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: 2,489
    03-20-2008, 11:38 AM Go to last post
  16. 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: 2,744
    03-10-2008, 03:06 PM Go to last post
  17. 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: 4,251
    03-07-2008, 04:10 PM Go to last post
  18. 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: 3,752
    02-20-2008, 09:00 AM Go to last post
  19. 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: 6,497
    02-17-2008, 02:13 PM Go to last post
  20. 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: 2,725
    02-16-2008, 05:10 PM Go to last post
  21. 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: 2,190
    02-09-2008, 12:25 PM Go to last post
  22. 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: 5,974
    02-04-2008, 05:48 PM Go to last post
  23. 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: 2,791
    02-04-2008, 03:26 PM Go to last post
  24. 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: 2,350
    01-21-2008, 03:12 AM Go to last post
  25. 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: 2,563
    01-11-2008, 10:34 PM Go to last post
  26. 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: 4,152
    01-11-2008, 08:14 PM Go to last post
  27. 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 08:14 PM
    • Replies: 2
    • Views: 26,084
    01-07-2008, 06:58 AM Go to last post
  28. 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: 5,758
    12-30-2007, 05:45 PM Go to last post
  29. 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: 7,642
    12-28-2007, 11:31 AM Go to last post
  30. 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: 2,964
    12-06-2007, 02:14 PM Go to last post
  31. 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: 2,847
    11-29-2007, 11:26 AM Go to last post
  32. 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: 2,996
    11-26-2007, 04:10 AM Go to last post
  33. 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: 5,202
    11-05-2007, 09:44 AM Go to last post
  34. 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 03:40 PM
    • Replies: 0
    • Views: 3,456
    10-29-2007, 03:40 PM Go to last post
  35. 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 11:34 AM
    • Replies: 0
    • Views: 2,887
    10-19-2007, 11:34 AM Go to last post
  36. 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 07:14 AM
    • Replies: 9
    • Views: 3,908
    08-29-2007, 03:17 PM Go to last post
  37. 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 06:13 PM
    • Replies: 2
    • Views: 6,756
    08-24-2007, 06:49 PM Go to last post
  38. 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 01:21 PM
    • Replies: 6
    • Views: 4,136
    08-02-2007, 05:53 AM Go to last post
  39. 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 09:32 PM
    • Replies: 4
    • Views: 2,966
    07-19-2007, 02:33 PM Go to last post
  40. 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 08:30 AM
    • Replies: 5
    • Views: 5,027
    06-09-2007, 09:42 PM Go to last post
  41. 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 06:00 PM
    • Replies: 0
    • Views: 2,223
    05-15-2007, 06:00 PM Go to last post
  42. 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 03:01 AM
    • Replies: 1
    • Views: 3,305
    04-30-2007, 09:01 PM Go to last post
  43. 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 12:20 AM
    • Replies: 0
    • Views: 3,712
    04-23-2007, 12:20 AM Go to last post
  44. 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 09:23 AM
    • Replies: 0
    • Views: 2,179
    04-17-2007, 09:23 AM Go to last post
  45. 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: 3,959
    02-05-2007, 05:27 PM Go to last post
  46. 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: 2,900
    01-31-2007, 02:28 PM Go to last post
  47. 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: 4,141
    01-23-2007, 10:05 PM Go to last post
  48. 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: 6,761
    12-10-2006, 05:01 AM Go to last post
  49. 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: 4,136
    12-06-2006, 07:26 PM Go to last post
  50. 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: 7,437
    11-13-2006, 02:50 PM Go to last post
  51. 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 04:08 AM
    • Replies: 1
    • Views: 3,555
    10-08-2006, 05:46 PM Go to last post
  52. 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 05:47 PM
    • Replies: 2
    • Views: 2,534
    09-29-2006, 02:27 PM Go to last post
  53. 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 04:03 PM
    • Replies: 1
    • Views: 6,231
    09-05-2006, 08:27 PM Go to last post
  54. 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 12:22 AM
    • Replies: 1
    • Views: 105,163
    08-29-2006, 01:56 PM Go to last post
  55. 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 12:49 PM
    • Replies: 2
    • Views: 3,620
    08-29-2006, 09:22 AM Go to last post
  56. 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 03:34 AM
    • Replies: 0
    • Views: 3,885
    08-27-2006, 03:34 AM Go to last post
  57. 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 05:43 AM
    • Replies: 5
    • Views: 4,006
    08-11-2006, 12:24 AM Go to last post
  58. 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 12:25 PM
    • Replies: 0
    • Views: 3,336
    08-06-2006, 12:25 PM Go to last post
  59. 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 07:41 PM
    • Replies: 0
    • Views: 2,655
    06-11-2006, 07:41 PM Go to last post
  60. 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 06:29 PM
    • Replies: 0
    • Views: 2,921
    06-05-2006, 06:29 PM Go to last post

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