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Forum: Regression Analysis

Linear regression, linear models, nonlinear regression

  1. Hosmer-Lemeshow

    Hi! How do you discussion the vaule for the Hosmer-Lemeshow goodness of fitt in a logistic regression? I tha value 0,290 bad? Regards!

    Started by igolonte‎, 03-30-2011 07:25 AM
    • Replies: 7
    • Views: 9,339
    04-04-2011, 07:24 AM Go to last post
  2. 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: 9,313
    09-06-2008, 01:01 AM Go to last post
  3. Time Series - Differencing the data

    I'm still trying to teach myself time series and have a bunch of questions about differencing the data. I would be super appreciative if anyone could...

    Started by lancearmstrong1313‎, 08-20-2012 01:32 PM
    • Replies: 9
    • Views: 9,283
    09-17-2012, 12:46 PM Go to last post
  4. Use of regression models with centered variables

    Hi all, I'm a little confused about how to use a regression model with centered variables. I know how centering variables works for reducing...

    Started by Ytrack‎, 01-30-2012 10:37 PM
    centering variables, interaction terms, regression
    • Replies: 6
    • Views: 9,256
    02-01-2012, 12:23 AM Go to last post
  5. Question equivalence of t-test and F-test in ANOVA

    Something about ANOVA is confusing me. Say you have a regression model: y = b0 + b1*x1 (where b0 and b1 are coefficients and x1 is an...

    Started by rayuk‎, 12-26-2010 10:33 PM
    • Replies: 2
    • Views: 9,224
    12-26-2010, 11:21 PM Go to last post
  6. Post [R] Between subjects repeated measures ANOVA help. Level: Novice.

    Dear community, I am fairly new to the field of statistics and R and I apologise if my problem seems to be too basic. In my research I have...

    Started by pickle‎, 02-17-2013 09:25 AM
    3 Pages
    1 2 3
    • Replies: 40
    • Views: 9,200
    03-02-2013, 09:23 PM Go to last post
  7. Logistic Regression - Residual Deviance > Residual Df

    Hi There I'm doing a logistic regression on a set of data with 753 groups of observations (although some groups just have one observation). In...

    Started by uzuria‎, 03-28-2011 08:31 AM
    • Replies: 3
    • Views: 9,182
    04-03-2011, 08:08 AM Go to last post
  8. Logistic regression detection of multicollinearity- is VIF applicable?

    I have a model with a dichotomous DV and IVs both continuous/numerical and dichotomous. I checked for collinearity with Pearson. How do I check...

    Started by mtsip‎, 11-22-2012 07:40 PM
    detection, logistic, multicollinearity, regression, vif
    • Replies: 1
    • Views: 9,168
    04-24-2013, 04:36 PM Go to last post
  9. Partial r is greater than zero-order correlation

    I am puzzled by something I have not come across before. To explain, I have conducted a hierarchical multi-regression with a post-therapy outcome...

    Started by RDresearcher‎, 10-22-2010 02:47 PM
    • Replies: 1
    • Views: 9,151
    10-24-2010, 06:05 AM Go to last post
  10. Sxx from ANOVA output?

    Hi everyone, I have an upcoming test in Stats class. The professor has posted review questions but isn't responding to my questions. Below is a...

    Started by Sheesh19‎, 11-10-2011 10:55 AM
    • Replies: 2
    • Views: 9,108
    11-10-2011, 12:52 PM Go to last post
  11. Interaction Term in Logistic Regression

    I'm reading Kutner, et al., Applied Linear Statistical Models (5th), and came across something I don't recall the authors explaining. I vaguely...

    Started by bryangoodrich‎, 06-17-2011 12:07 AM
    • Replies: 8
    • Views: 9,091
    06-17-2011, 05:10 PM Go to last post
  12. heteroskedasticity and non normal residuals in linear regression - please help!

    Dear All I'm struggling with a linear model. My dependent variable is change in central anterior chamber depth of the eye with time. ...

    Started by SiBorg‎, 09-26-2012 01:23 PM
    3 Pages
    1 2 3
    • Replies: 35
    • Views: 9,082
    10-21-2012, 11:36 AM Go to last post
  13. Comparing coefficients in Logistic Regression

    Hello ! I would like to have guidance on what follows. I was fitting a Logistic Regression model, and I got the coefficients for the model's...

    Started by gianmarco‎, 07-29-2014 07:08 AM
    • Replies: 14
    • Views: 9,043
    06-02-2015, 09:08 AM Go to last post
  14. Question Partial Correlation vs. Multiple Regression

    What is the purpose of doing JUST a partial correlation as opposed to a full multiple regression? (In cases where there is a clear outcome variable.)...

    Started by ionpattern‎, 03-12-2010 10:50 AM
    • Replies: 2
    • Views: 8,991
    04-07-2010, 08:40 AM Go to last post
  15. How many data points needed before a nonlinear regression model can be performed?

    With a within-subject design of only one independent variable, I'm wondering how many data points (levels of the indept variable along X axis) do I...

    Started by metric‎, 08-09-2010 01:52 PM
    • Replies: 4
    • Views: 8,980
    08-09-2010, 03:29 PM Go to last post
  16. Incremental update to *existing* Logistic Regression model?

    Hi, In our work, we have a large-scale logistic regression model we hate to train everyday. Is there a way we can somehow update the existing...

    Started by peacherwoo‎, 01-17-2011 01:47 PM
    incremental, l1 regularizer, logistic regression, update
    • Replies: 6
    • Views: 8,930
    05-28-2014, 03:18 AM Go to last post
  17. Regression delivers significant results, but correlation no

    Hello there, This is my first posting and I would highly appreciate if someone could help me :) After utilizing the search function, I found no...

    Started by JoXel‎, 01-16-2013 08:31 AM
    • Replies: 3
    • Views: 8,927
    01-17-2013, 12:13 PM Go to last post
  18. Confidence Intervals for Estimates in Multinomial Logistic Regression

    Hello all, Is there a way to calculate a confidence interval for the estimates occurances of a dependent variable when using multinomial logistic...

    Started by PsychResearcherRASIS‎, 02-07-2011 11:09 AM
    • Replies: 8
    • Views: 8,892
    06-05-2011, 03:51 PM Go to last post
  19. Choosing predictor variables to use in multiple linear regression models

    I want to figure out what combination (both individual variables and interactions, if any) of independent variables predict my dependent variable....

    Started by TreeMan13‎, 12-18-2011 10:08 PM
    • Replies: 2
    • Views: 8,847
    12-18-2011, 11:09 PM Go to last post
  20. Unhappy Logistic Regression on small sample size/case ratio - SPSS?

    Hi all - I have a small issue. I have a categorical dichotomous DV (0,1) with 4 IV's , two of which are categorical and dichotomous (0,1), and the...

    Started by ProXy124c41‎, 10-30-2014 12:08 PM
    logistic
    • Replies: 2
    • Views: 8,839
    11-03-2014, 10:04 PM Go to last post
  21. dummy variable multiple regression

    Hello guys, I am doing a project on calendar affects(seasonality) in the stock market for which i am trying to perform a dummy variable regression...

    Started by Manasa‎, 02-17-2011 08:45 AM
    • Replies: 2
    • Views: 8,833
    02-17-2011, 12:04 PM Go to last post
  22. Proof of Variance(b1)

    So I guess this is simple regression through the origin. I'm not sure if I'm doing this wrong or what to do next in the proof. I skipped a few steps...

    Started by TheRealAct‎, 09-28-2013 04:23 PM
    • Replies: 14
    • Views: 8,789
    09-29-2013, 10:45 AM Go to last post
  23. Interpreting Interactions in Binary Logistic Regression

    Hi! I was wondering if anyone knows how to interpret interactions in SPSS, for logistic regressions, or how a good source that might outline this....

    Started by stan09‎, 01-11-2011 11:40 AM
    interaction effect
    • Replies: 1
    • Views: 8,733
    01-13-2011, 08:23 PM Go to last post
  24. why is the covariance of my residuals not 0?

    hello there. i am trying to wrap my head around the assumption that, in regular OLS regression, the covariance of the residuals is 0. i worked out a...

    Started by will22‎, 09-29-2011 09:45 PM
    • Replies: 11
    • Views: 8,699
    09-30-2011, 12:41 PM Go to last post
  25. 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: 8,626
    03-25-2008, 03:58 PM Go to last post
  26. Proving variance of b0(hat)

    i have a question asking to prove (attached image): I'm completely stuck and any help would be appreciated. thanks

    Started by s-z‎, 04-02-2014 02:24 AM
    • Replies: 3
    • Views: 8,558
    04-02-2014, 10:02 PM Go to last post
  27. Seasonality and dummy variables

    Hey, I've got this econometric problem I could use some help with. I'm looking for day of the week effects in a certain index. I'm using a regression...

    Started by Sands‎, 11-22-2011 03:35 AM
    • Replies: 11
    • Views: 8,555
    11-23-2011, 05:30 AM Go to last post
  28. multiple regression

    Hi , i have three variables for the question below.For each scenarios that is gulf view houses and no gulf view houses. The variables are sale...

    Started by SadieKhan‎, 11-09-2010 06:12 PM
    • Replies: 4
    • Views: 8,539
    11-10-2010, 01:06 AM Go to last post
  29. Linear Regression Coefficient and Multiple Regression Coefficient

    Hello Folks: When you use just 2 variables for regression and then when you use the same 2 variables plus an additional 2 other independent...

    Started by jintu7977‎, 04-02-2011 10:10 PM
    omitted variable bias
    • Replies: 3
    • Views: 8,463
    04-07-2011, 08:48 PM Go to last post
  30. Multiple Regression with negative constant for price

    Hi there, I am carrying out a project study, in which I am studying the relationship between the price of property in three regions in the UK along...

    Started by sajin‎, 03-24-2013 04:40 AM
    • Replies: 2
    • Views: 8,450
    03-25-2013, 11:11 AM Go to last post
  31. Descriptive research and regression analysis?

    Please pardon my ignorance...can I use multiple regression analysis in a descriptive research design to answer my hypotheses? If not, can anyone...

    Started by reakhavok‎, 09-18-2010 01:53 PM
    • Replies: 4
    • Views: 8,412
    09-19-2010, 01:11 PM Go to last post
  32. Regressional on likert scale data using spss

    Hi guys, I am in a fix!!:confused:. My questionnaires have recently been filled but am yet to figure out how to analyze my data. My topic is "impact...

    Started by thega‎, 04-04-2011 06:59 AM
    • Replies: 2
    • Views: 8,401
    08-26-2015, 08:56 AM Go to last post
  33. Multiple regression models, AIC and PASW

    Hi. I would like to calculate AIC values from the different models I have created via stepwise multiple regression in the program PASW (SPSS). I...

    Started by Pen‎, 07-27-2010 07:25 AM
    • Replies: 2
    • Views: 8,366
    07-27-2010, 05:31 PM Go to last post
  34. Please explain differences between R and r

    Hello, I received my dissertation back with comments from the dean. He flagged the following text and added the following comments: Am I...

    Started by lph2005‎, 07-17-2009 11:48 PM
    • Replies: 0
    • Views: 8,357
    07-17-2009, 11:48 PM Go to last post
  35. 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: 8,318
    10-31-2013, 12:56 PM Go to last post
  36. Ordinal Regression: Test of Parallel Lines

    Hi, I am trying to fit a model by using ordinal regression. I have got two co-variates, and one factor with four groups. The dependent variable...

    Started by Lotte‎, 08-26-2010 07:06 PM
    • Replies: 3
    • Views: 8,292
    08-27-2010, 09:47 PM Go to last post
  37. The differences between subdistribution hazard ratios and hazard ratios

    Hello everybody! I just wondered if someone knows what the differences is between a subdistribution hazard ratios (sHR) and the hazard ratios...

    Started by Sirikon‎, 06-04-2012 08:17 AM
    • Replies: 2
    • Views: 8,267
    06-05-2012, 06:19 AM Go to last post
  38. Significance of regression coefficients and interpretation problems

    Dear All, I am currently facing a problem regarding the statistical interpretation of nonsignificant coefficients. I would like to know whether...

    Started by pff‎, 01-07-2011 06:05 AM
    • Replies: 3
    • Views: 8,195
    01-11-2011, 02:28 PM Go to last post
  39. Large logit coefficient - what it means

    I am constructing a logit model with 6 explanators, trying to predict outcomes of hockey matches using odds (the variable I am referring to below)...

    Started by neil1690‎, 03-11-2013 10:41 AM
    logit model
    • Replies: 12
    • Views: 8,189
    03-12-2013, 06:06 PM Go to last post
  40. calculating adjusted rsquared by hand

    Hi. I just wanted to make sure I am doing these calculations correctly. I have 8 models, one with no variables. So to get the adjusted rsquared, I...

    Started by brian005‎, 10-21-2013 06:43 PM
    • Replies: 1
    • Views: 8,189
    10-30-2013, 11:59 AM Go to last post
  41. unable to make model Hessian positive definite - help!

    Hello all, My first time posting here, and really hoping that someone can help me out! I have data from a repeated measures experiment in which...

    Started by rtoaff‎, 01-16-2012 10:10 AM
    covariance structure, hessian positive definite, proc mixed, repeated measures
    • Replies: 0
    • Views: 8,157
    01-16-2012, 10:10 AM Go to last post
  42. Post hoc in ANCOVA

    I'm trying to conduct a post hoc test on the results of an ANCOVA: > model <- aov(Max~Weight*Diet) > summary(model) But when I run the Tukey...

    Started by Oritteropus‎, 01-18-2012 05:39 AM
    • Replies: 5
    • Views: 8,107
    01-20-2012, 07:59 AM Go to last post
  43. Relationship between Pearson correlation and variance in regression model

    If the correlation between X and Y, say, is 0.5, then the standard deviation of the differences between the Y values and their predicted values on...

    Started by _joey‎, 08-12-2012 08:50 PM
    • Replies: 14
    • Views: 8,089
    08-12-2012, 11:33 PM Go to last post
  44. Gauss Elimination

    Hi guys. Im being asked to program Gauss Elimination in R .Im new using this kind of program. It's simple but i don't know how to start. can someone...

    Started by DeMouraBR‎, 06-02-2011 09:45 AM
    • Replies: 13
    • Views: 8,066
    06-09-2011, 10:25 AM Go to last post
  45. Sample size of Categorical Variables

    Hi, I'm running a binary logistic model that includes categorical variables. One of my main covariates has 8 categories and some of the sample...

    Started by li_mee‎, 07-09-2012 10:21 AM
    categorical variable, dummy variables, logistic regression, sample
    • Replies: 6
    • Views: 8,044
    07-23-2012, 08:17 AM Go to last post
  46. Question Significant regression coefficient vs. significant overall model

    Hi everyone, I have rather a simple question but for some reason have not been able to find a clear answer. My apologies if I have missed a...

    Started by Lara333‎, 02-01-2012 09:57 AM
    multiple regression, significance
    • Replies: 2
    • Views: 8,043
    02-02-2012, 08:51 AM Go to last post
  47. Question Any software to get sample size/power analysis for probit regression?

    Hi All, I need to figure out sample size for an upcoming study that will utilize a probit regression to test agreement of a new diagnostic test to...

    Started by SabbyATL‎, 09-14-2011 04:12 AM
    • Replies: 12
    • Views: 8,026
    09-19-2011, 12:06 PM Go to last post
  48. ridge regression example

    Data Display Row x1 x2 y 1 1 1 2 2 5 4 5 3 5 5 6 4 5 6 6 5 ...

    Started by magicianmagi‎, 01-09-2012 10:08 AM
    • Replies: 4
    • Views: 7,992
    01-11-2012, 01:43 AM Go to last post
  49. Develop analysis plan on Medical data - trend analysis and model

    First, let me say thank you for any help you can give. I have been searching for nearly two days for a solution to my problem and continue to be...

    Started by JHale‎, 02-24-2011 08:43 AM
    • Replies: 1
    • Views: 7,969
    02-24-2011, 11:20 AM Go to last post
  50. Simultaneous causality?

    I'm doing some applied econometrics and I'm a bit concerned about the model that I've been asked to estimate. Consider 3 stochastic time series...

    Started by derksheng‎, 08-11-2012 04:47 AM
    • Replies: 3
    • Views: 7,904
    08-11-2012, 10:14 AM Go to last post
  51. simultaneous causality correction?

    Hi Based on a data set I have to answer whether the use of tele-diagnosis and tele-evaluation by health professionals in Andalusia has a positive...

    Started by m.lindebjerg‎, 01-04-2013 01:22 PM
    bias, causality, regression, simultaneous
    • Replies: 2
    • Views: 7,883
    01-04-2013, 04:44 PM Go to last post
  52. analyzing residual plot by hand

    Hi! Thanks in advance for looking at my query. I have a very basic question regarding regression. We have to analyze a residual Plot by hand. We...

    Started by ealeql‎, 12-06-2010 07:42 PM
    • Replies: 1
    • Views: 7,874
    12-06-2010, 07:54 PM Go to last post
  53. Combining Prediction Intervals

    I'm having trouble finding how to combine a number of prediction intervals. The best way to explain the problem is: Imagine a race with 4 relay...

    Started by Rob‎, 11-16-2007 11:13 AM
    • Replies: 4
    • Views: 7,856
    07-22-2010, 04:12 PM Go to last post
  54. variance for multiple regression model

    studying for a test.. any help appreciated.. Consider the multiple regression model Y = Xβ + ϵ, where X is n x (k+1) matrix, β is a vector of...

    Started by hanelliot‎, 06-21-2009 12:00 PM
    • Replies: 5
    • Views: 7,817
    06-22-2012, 03:47 AM Go to last post
  55. (SPSS) Multinomial Logistic Regression- testing IIA- Hausman-McFadden

    hi all, I am using SPSS 20 to analyze survey data. I am using Multinomial Logistic Regression and have come up with three "models", containing...

    Started by Syd‎, 02-25-2013 08:26 PM
    iia
    • Replies: 2
    • Views: 7,760
    02-28-2013, 09:08 PM Go to last post
  56. How to check the importance of Dummy variable in multiple regression?

    Hi All, I am doing a Multiple regression with one non numeric independent variable. I changed this variable into a dummy variable which is now...

    Started by sach_83‎, 01-01-2011 05:50 PM
    • Replies: 2
    • Views: 7,718
    01-02-2011, 04:33 AM Go to last post
  57. Question Confusion over the F-ratio in a hierarchical multiple regression

    Hey all, I'm not used to work with multiple regression analysis, so I would be glad if anyone could help me interpreting this result: I...

    Started by Comfort Eagle‎, 08-26-2013 03:43 AM
    f-change, f-ratio, hierarchical regression, multiple regression
    • Replies: 1
    • Views: 7,656
    08-26-2013, 09:33 AM Go to last post
  58. 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: 7,655
    12-28-2007, 11:31 AM Go to last post
  59. test of non-linearity

    I am reading an interesting econometric book where the author suggests testing if non-linearity exist by specifying a quadratic term, if its...

    Started by noetsi‎, 06-25-2016 03:56 PM
    2 Pages
    1 2
    • Replies: 15
    • Views: 7,651
    06-30-2016, 02:24 PM Go to last post
  60. Post Multiple regression - Best predictor

    Hello there! I am studying for a final exam next week and I'm not sure about this. How do we determine the "best predictor" in multiple...

    Started by johncuny‎, 05-03-2011 05:49 PM
    • Replies: 2
    • Views: 7,643
    05-04-2011, 08:23 AM Go to last post

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