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Forum: Regression Analysis

Linear regression, linear models, nonlinear regression

  1. univariate vs multivariate

    Hi, I have a question about interpreting univariate vs. multivariate (linear) regression. When I'm reading journal articles often both approaches...

    Started by williaml‎, 01-06-2009 08:58 PM
    • Replies: 5
    • Views: 40,710
    04-02-2013, 05:41 AM Go to last post
  2. Question Logistic regression and correlation

    Hi I'm building an account management scorecard with logistic regression. Some of the variables have quite large correlations, but they get selected...

    Started by Jolene‎, 06-10-2011 04:12 AM
    correlation, logistic, multicollinearity, scorecard
    • Replies: 5
    • Views: 10,942
    04-24-2013, 05:00 PM Go to last post
  3. Not Quite Quadratic Regression

    Hello all, I predict an u-shaped relation between two variables, y and x. If I perform a quadratic linear regression, i.e. use a model like ...

    Started by cause‎, 08-03-2012 09:00 PM
    fractional polynomials, non-linearity, polynomial regression, quadratic regression
    • Replies: 5
    • Views: 2,351
    08-04-2012, 07:46 AM Go to last post
  4. What does Durbin Wason for Time Series test for?

    Does the Durbin-Watson test for seasonality effect? If the p-value <.05 then there is reason to believe that some type of seasonality (whether it be...

    Started by lancearmstrong1313‎, 08-16-2012 09:47 AM
    • Replies: 5
    • Views: 2,785
    08-16-2012, 01:49 PM Go to last post
  5. Multiple Time Series Regression? Time Series with multiple independent variables

    I've asked a lot about time series in general but perhaps I should be focusing my questions about this: is it possible to do a time series...

    Started by lancearmstrong1313‎, 08-23-2012 12:37 PM
    • Replies: 5
    • Views: 20,364
    09-26-2012, 09:03 AM Go to last post
  6. Statistical Analysis - Multiple Regression?

    Hi I am struggling through my 4th year thesis - so very stuck on the data set and the best way of testing my hypotheses. I apologise if my question...

    Started by PJLopey‎, 08-24-2012 09:13 PM
    • Replies: 5
    • Views: 1,835
    08-24-2012, 11:10 PM Go to last post
  7. Appropriateness of fixed effect model for temporal/ spatial effects (Ecology)

    Hello, I hope you can help me with this. I'm in the throes of finishing my masters thesis, and am stumbling on my model. I've talked a lot with...

    Started by jeskill‎, 08-31-2012 10:37 AM
    • Replies: 5
    • Views: 2,423
    09-01-2012, 10:54 AM Go to last post
  8. what is the highest number of variables to use for regression analysis?

    Hi, Just wanted to ask what people thought was the highest number of variables could be used with regression analysis? Also, are there other...

    Started by arkantosno1‎, 09-01-2012 09:37 AM
    • Replies: 5
    • Views: 1,272
    09-01-2012, 01:43 PM Go to last post
  9. Effect size in multiple regression

    Hello, I'm using this this calculator to determine a rough sample size for a multiple regression (20 predictors). ...

    Started by bradyj2‎, 09-20-2012 08:53 AM
    • Replies: 5
    • Views: 6,616
    09-20-2012, 11:30 AM Go to last post
  10. Regression where variables cannot be below a certain value

    Hello, to quickly describe my general situation, I am trying to model total cost based on certain services used in a hospital. So for example, I want...

    Started by lancearmstrong1313‎, 09-24-2012 02:26 PM
    • Replies: 5
    • Views: 1,658
    09-24-2012, 03:01 PM Go to last post
  11. How to assess Goodness-of-fit

    I have fitted a set of data points to an exponential decay curve of the equation: y=A+Be^(-t). I wish to assess the quality of fit. Is it OK if...

    Started by dr_rk‎, 09-28-2012 03:45 AM
    chi-squared, goodness of fit, non-linear regression
    • Replies: 5
    • Views: 2,002
    09-30-2012, 11:48 AM Go to last post
  12. High coefficients and intercept

    Hello fellow forum-ers, Hoping someone can provide some insight into a regression issue I am dealing with. I am using Excel and trying to...

    Started by derek.canada‎, 10-17-2012 11:51 AM
    • Replies: 5
    • Views: 2,016
    10-17-2012, 01:05 PM Go to last post
  13. Multiple Regression - Multicollinearity

    Hi I'd really appreciate it if anyone could help me with this. I'm doing statistics coursework as part of a Psychology degree and have come across...

    Started by James73‎, 11-10-2012 07:11 PM
    multicollinearity, multiple regression
    • Replies: 5
    • Views: 1,893
    11-12-2012, 03:58 AM Go to last post
  14. Linear regression - Controlling the pre-measure of my response variable

    Hello everyone! :wave: Context: I want to analyze the change in anxiety scores (STAI) in a group of patients undergoing surgery and relate it to...

    Started by Mase‎, 11-13-2012 03:33 AM
    • Replies: 5
    • Views: 3,121
    11-14-2012, 11:53 AM Go to last post
  15. 22 enough for multiple regression?

    Hello guys, i am doing a thesis on a given industry having only 22 enterprises. As the population size is small i have decided to go for census. But...

    Started by gett_u@yahoo.com‎, 11-16-2012 01:40 AM
    • Replies: 5
    • Views: 1,902
    11-20-2012, 02:58 AM Go to last post
  16. Choosing the best dependent variable (Y)

    Hello, I'm working on a multiple regression model. The dependent variable (Y) is an ordered multinomial qualitative variable. To do regression...

    Started by goldenboy‎, 11-23-2012 05:16 AM
    best dependent variable
    • Replies: 5
    • Views: 3,068
    12-03-2012, 05:03 AM Go to last post
  17. Logistics Regression and Mediation

    Hey, I'm soon to be using data from a large cohort. Ideally I want to look at whether depressive symptoms in childhood effects attentional...

    Started by loops22‎, 04-09-2013 11:16 AM
    • Replies: 5
    • Views: 2,828
    04-09-2013, 04:18 PM Go to last post
  18. Regression sample size

    Members, Please let me know if i can do a regression analysis for a sample size 40 with 8 predictor variables?

    Started by chella‎, 01-20-2013 01:34 PM
    • Replies: 5
    • Views: 3,305
    01-24-2013, 05:24 AM Go to last post
  19. Hypothesis Testing in Regression

    I have fit a multilinear regression with response Y and predictors x1, x2, x3, x4 and x5. I have constructed a hypothesis i wish to test. The null is...

    Started by Wizboar‎, 05-07-2013 08:29 PM
    • Replies: 5
    • Views: 2,944
    05-07-2013, 11:58 PM Go to last post
  20. Logistic model interpretation - insignificant main effect, significant interaction

    Hi! I am running a logistic regression model where I investigate what characteristics matter when a group of people chooses representatives for...

    Started by plopp‎, 04-10-2013 08:23 AM
    • Replies: 5
    • Views: 5,303
    04-10-2013, 05:19 PM Go to last post
  21. Comparing 2 multiple regression model???

    Hi im new here and to tell the truth i'm still learning about stat and struggling a little bit in my thesis so my question is what should i use is...

    Started by Andy_G‎, 01-10-2013 01:33 PM
    compare regression linear
    • Replies: 5
    • Views: 1,809
    01-11-2013, 09:34 AM Go to last post
  22. Regression with only positive values

    Hi, I'm new and I don't have much mathematical knowledge, just the basis. I have 13 independent variables, and I'm trying to know how much each of...

    Started by Paul_‎, 01-02-2013 07:57 PM
    • Replies: 5
    • Views: 3,480
    01-08-2013, 05:07 PM Go to last post
  23. Regression Model is signifianct but all explanatory variables are insignifiant!!!

    Hi all, I need your help is the following: My Model is as the following Dependent variable is GDP per capita growth rate Explanatory...

    Started by mnouri‎, 01-15-2013 08:21 AM
    insignificant, model checking, regression coefficients
    • Replies: 5
    • Views: 1,305
    01-24-2013, 05:35 AM Go to last post
  24. Question Question about dealing with missing values in regression

    Hey guys, I have a dataset with ~50 variables, but my dataset is incomplete. For some of these variables (e.g. those for gender) i have created...

    Started by qazxsw99‎, 01-08-2013 07:53 PM
    missing values, stata
    • Replies: 5
    • Views: 1,368
    01-09-2013, 05:40 PM Go to last post
  25. bivariate regression question

    Hi everyone: I am have conducted bivariate regression analysis to examine the effect of: an (x) independent variable, age (nominal) on a (y)...

    Started by parsec2011‎, 03-15-2013 12:46 AM
    • Replies: 5
    • Views: 2,672
    03-15-2013, 02:52 PM Go to last post
  26. Post Logistic Regression: To dummy code or not to? Which backward elimination to use?

    I have 10 binary dependent variables (disease prevalence: yes/no, 1/0). I want to do a logistical regression with each of them with the following...

    Started by Daedalus‎, 02-21-2013 12:13 PM
    backward elimination, binary variables, dummy coding, logistical regresion
    • Replies: 5
    • Views: 16,386
    02-22-2013, 11:13 AM Go to last post
  27. Stepwise multiple regression (spss gives warning that no variables were entered)

    Hello everyone, Help! Help!!!!!! I need help for stepwise multiple linear regression I'm performing with spss version 21. I have tried several...

    Started by Kasco‎, 04-16-2013 04:15 AM
    • Replies: 5
    • Views: 16,933
    04-16-2013, 05:54 AM Go to last post
  28. Questions on which stats to use & sigmaplot for Logistic Regression

    Hi Everyone, This is my first time on the forum. I have been having problems deciding on what test to use for my data and how to input the data...

    Started by Bennice‎, 03-04-2013 07:59 PM
    • Replies: 5
    • Views: 4,250
    03-05-2013, 12:09 PM Go to last post
  29. Logistic Regression: Odds Ratio Estimate=1

    Hi, I am working with a logistic regression which I got as result the odds ratio estimate equals 1 for some predictive variables. As odds ratio=1,...

    Started by Marcio_m_r‎, 04-17-2013 07:31 AM
    • Replies: 5
    • Views: 1,569
    04-18-2013, 12:03 PM Go to last post
  30. Regression more than two Y variables

    Hi, sorry this is probably a very stupid question! I'm just trying to finish m thesis proposal and have just realised that my statistics are wrong. I...

    Started by cheesefeind‎, 02-04-2013 11:36 AM
    • Replies: 5
    • Views: 3,517
    02-04-2013, 02:12 PM Go to last post
  31. Independent variables: 1 to 5 star rating

    Hello, I'm having a little difficulty specifying two independent variables; Customer Score and Expert Score. The reviews are each assigned 1 to...

    Started by BellaRiley‎, 04-24-2013 12:39 PM
    • Replies: 5
    • Views: 2,629
    04-25-2013, 12:11 AM Go to last post
  32. Lots of regressions!

    Hi, I need to run a whole slew of regressions for a study. Should I use a more strict cut-off (e.g. p<0.01) and why? Thanks in advance! Jvic

    Started by JVIC‎, 05-03-2013 12:36 AM
    • Replies: 5
    • Views: 1,480
    05-03-2013, 08:05 AM Go to last post
  33. Specific and common variables

    Hello! I'm trying to build a regression model for forecasting. The problem is that some parameters, are common for all observations and one of them...

    Started by crazyfrogspb‎, 05-03-2013 08:57 AM
    • Replies: 5
    • Views: 1,901
    05-06-2013, 12:08 PM Go to last post
  34. Question Asasociation between two series of measurements

    I have series of (metric) lab variables measured in a group of patients, with once daily measurements over 20 days, and I would like to investigate...

    Started by AVoelp‎, 05-22-2013 04:36 AM
    • Replies: 5
    • Views: 1,313
    05-23-2013, 06:04 AM Go to last post
  35. Comparing linear regressions - what method to use?

    I have a number of measurements of the initial reaction rate of x reactions. Assuming linearity until t = y gives me x linear regressions with...

    Started by ulrika‎, 05-27-2013 11:29 AM
    chemistry, comparing slopes, reaction rate
    • Replies: 5
    • Views: 1,791
    06-01-2013, 09:04 AM Go to last post
  36. What kind of regression analysis should I use?

    Dear All, I would like to conduct a regression analysis on a data set which includes dicrete inputs (Xs). The purpose is to have a regression...

    Started by togyika924‎, 06-12-2013 10:37 AM
    • Replies: 5
    • Views: 2,646
    06-14-2013, 01:49 AM Go to last post
  37. Computing confidence interval for a derivative of the population regression function

    Hello, My is question is in the attached pdf file. I hope this is the right place to ask this/ Thanks in advance!

    Started by mrrmd‎, 06-18-2013 10:20 AM
    • Replies: 5
    • Views: 2,033
    06-18-2013, 01:34 PM Go to last post
  38. Regression coefficient- random variable or a constant?

    Hello, The question is in the attached pdf, thanks in advance. I am sorry, but I having trouble writing math in the thread itself

    Started by mrrmd‎, 06-23-2013 09:45 AM
    • Replies: 5
    • Views: 4,443
    06-23-2013, 02:32 PM Go to last post
  39. Time Series regression: No significance with increased sample size

    Hi there, I am running a time series regression with an equity markets returns as my dependent variable and a) oil prices, b) interest rate...

    Started by jamier‎, 07-31-2013 12:30 AM
    • Replies: 5
    • Views: 1,745
    07-31-2013, 10:25 AM Go to last post
  40. Combining various prediction equations.

    Hello all, I have been looking for a method to combine various linear prediction equations. These equations predict the same quantity but...

    Started by zoulzubazz‎, 06-21-2013 01:01 PM
    • Replies: 5
    • Views: 1,572
    07-05-2013, 12:55 PM Go to last post
  41. Regression Equation : Looking for some help

    Hi buddies, I'm new here and trying to learn SPSS. To be honest, do not have good knowledge on it. looking for some help. Would really be thankful...

    Started by hadiur‎, 08-01-2013 05:06 PM
    regression analysis
    • Replies: 5
    • Views: 2,447
    08-01-2013, 06:47 PM Go to last post
  42. Multi variabile time series analysis

    Hi guys, I am looking at a multi variate regression with time series data. I am basically looking at finding out the impact that oil prices (WTI...

    Started by jamier‎, 07-24-2013 02:38 PM
    • Replies: 5
    • Views: 1,740
    07-25-2013, 09:22 AM Go to last post
  43. [SOLVED] Robust regression

    I am new to this method. SAS uses one of two alternates to generate the weights that are central to addressing outliers in robust regression. One is...

    Started by noetsi‎, 06-28-2013 12:09 PM
    • Replies: 5
    • Views: 1,919
    07-01-2013, 05:17 PM Go to last post
  44. Unordered categorical variables and linear regression

    Hi everyone, I am new to this forum and still sort of a novice with regards to statistics. In my M.A. thesis I use one binary dependent...

    Started by Rasgal‎, 07-19-2013 10:19 AM
    • Replies: 5
    • Views: 3,769
    07-26-2013, 01:04 PM Go to last post
  45. Standardized regression coefficients - why?

    Hello everybody :wave: When doing a multiple linear regression analysis, you would often like to know which predictor variable has the most...

    Started by RorschachDK‎, 07-16-2013 09:20 AM
    • Replies: 5
    • Views: 2,126
    07-18-2013, 08:57 AM Go to last post
  46. Mediation analysis with the DV following a gamma distribution.

    Hi there, I am in the early stages of data analysis and could really use some advise. Basically, I am testing whether music tempo influences...

    Started by claudiamalvinas‎, 07-04-2013 10:55 PM
    • Replies: 5
    • Views: 1,233
    07-05-2013, 12:01 AM Go to last post
  47. Interpreting multiple regression analysis

    Hello, I hope someone knows what the answer is to my question: I have a multiple regression analysis. Dependent variable is performance (time)...

    Started by people‎, 08-01-2013 06:50 AM
    • Replies: 5
    • Views: 1,740
    08-01-2013, 12:39 PM Go to last post
  48. Interaction effect and model interpretation

    Hello all, Hoping someone can help with a model selection question... I'm testing the degredation rates of DNA (amount of error in...

    Started by lk9‎, 07-27-2013 07:56 AM
    • Replies: 5
    • Views: 2,626
    07-29-2013, 10:08 AM Go to last post
  49. New To Regression Analysis, Positive Beta should be negative?

    Hey everyone, new to the community and looking for some help. Would greatly appreciate any input you're able to offer! I'm currently in the...

    Started by ScientistBlah‎, 07-31-2013 03:54 PM
    • Replies: 5
    • Views: 2,729
    08-01-2013, 12:29 PM Go to last post
  50. help on SAS Output

    Hi everyone, new to the community and looking for some help. I'm currently in the process of writing my thesis and having some difficulties with...

    Started by Dilschad‎, 08-16-2013 05:05 PM
    • Replies: 5
    • Views: 1,994
    08-17-2013, 08:33 AM Go to last post
  51. How to do Curve fit for data

    I am not able to fit curve for the data I have, and need some help. I removed metal from water and obtained the following results: days Removal...

    Started by Chandrima‎, 08-28-2013 12:55 AM
    • Replies: 5
    • Views: 1,738
    08-28-2013, 10:56 AM Go to last post
  52. How to deal with collinearity?

    I am wondering what methods everyone uses to deal with collinearity. I recently came across this article http://bit.ly/14wDcgH But it doesn't really...

    Started by stats4cool‎, 09-08-2013 03:40 PM
    • Replies: 5
    • Views: 4,869
    09-09-2013, 03:14 PM Go to last post
  53. continuous dep variable with several indip dicotomic variables: which statistic?

    Hello there! I have to analyze these results: my dependent variable is continuous (blood levels of a substance) I have several indipendent...

    Started by Rerun‎, 09-01-2013 03:30 PM
    • Replies: 5
    • Views: 2,490
    09-04-2013, 08:30 AM Go to last post
  54. LH ratio significant but covariates not?

    I have performed Cox regression analysis using Forward LR method. As a results two covariates are included in the final model. First one has two...

    Started by arkiaamu‎, 09-03-2013 01:45 PM
    • Replies: 5
    • Views: 1,763
    09-06-2013, 10:06 AM Go to last post
  55. Lightbulb Repeated Measures ANOVA (Split-Plot ANOVA) analysis of residuals

    Hi, how to process decent residual analysis in repeated measures? I know that the residuals should have normal distribution (altogether an in...

    Started by Martin Marko‎, 09-09-2013 12:33 PM
    anova, model checking, repeated measures, residual analysis, residuals
    • Replies: 5
    • Views: 3,928
    09-10-2013, 07:02 AM Go to last post
  56. Normalized dependent variable in regression

    Hello I have normalized my DV to have normal residuals for regression analysis using natural logarithm transformation. However I'm confused about...

    Started by Bahareh‎, 10-18-2013 02:41 AM
    • Replies: 5
    • Views: 6,868
    10-21-2013, 08:11 AM Go to last post
  57. Multiple regression analysis-coefficient table

    Hi, I am currently working on a project which requires a multiple regression analysis (using enter-standard method) and I am stuck with...

    Started by Elina‎, 11-22-2013 11:35 AM
    • Replies: 5
    • Views: 1,894
    11-22-2013, 04:55 PM Go to last post
  58. Linear correlation coefficient with a yes or no variable...

    Please pardon my ignorance as I have not had statistics in 20 years. I would like to attempt correlate student GPA with use of an ipod during school...

    Started by tomgallopavo‎, 11-19-2013 12:28 PM
    • Replies: 5
    • Views: 2,450
    11-19-2013, 01:14 PM Go to last post
  59. Urgent regression analysis

    Guys i have an assesment for tommorow, and i have to make an analysis, simple but hard since i didnt really pay attention in class.... I have been...

    Started by kozanostraa‎, 09-30-2013 08:50 PM
    • Replies: 5
    • Views: 1,940
    10-01-2013, 03:06 AM Go to last post
  60. Ordinal Regression: Parallel Lines Test

    Hi All, I'm analyzing survey results with many responses coming in the form of Likert scales. In this case, I actually have two Likert scale...

    Started by jeffweiner41‎, 10-31-2013 12:00 AM
    ordinal regression
    • Replies: 5
    • Views: 8,245
    10-31-2013, 12:56 PM Go to last post

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