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Forum: Regression Analysis

Linear regression, linear models, nonlinear regression

  1. Regression Methods

    Hello, I have 1 dependent variable and 30 independent variables. I used forward method for selecting the important variables. The Adjusted R square...

    Started by Bahareh‎, 11-01-2013 03:01 PM
    2 Pages
    1 2
    • Replies: 15
    • Views: 3,504
    11-07-2013, 04:59 PM Go to last post
  2. How to model large multivariate dataset

    I have a years worth of data at a manufacturing plant with 20 predictor variables and 8 response variables that I'm interested in. A number of the...

    Started by bjbreitling‎, 11-07-2013 10:42 AM
    multiple regression
    • Replies: 2
    • Views: 1,375
    11-07-2013, 12:46 PM Go to last post
  3. regression analysis to measure TV advertising effectiveness

    Hi, I am running a TV advertising analysis where I want to measure if having a 5 day advertising campaign or 7 day advertising campaign would be...

    Started by jennxf‎, 11-06-2013 02:05 AM
    • Replies: 1
    • Views: 2,067
    11-07-2013, 08:40 AM Go to last post
  4. Multiple Linear Regression and likelihood Ratio Test

    Hi All, I have completed multiple regressions with one model including an interaction term, and the other not including the interaction term. ...

    Started by chiccaboom‎, 11-05-2013 09:44 PM
    • Replies: 4
    • Views: 5,648
    11-06-2013, 09:22 PM Go to last post
  5. Help me interperet this output with non significance. :)

    I have completed analysis on the effects of two drug treatments over a period of time on the CD4 cell count of a number of patients. I have taken the...

    Started by tamintl‎, 11-05-2013 07:06 AM
    • Replies: 1
    • Views: 1,224
    11-06-2013, 02:47 PM Go to last post
  6. Comparing negative binomial model to the null model with offsets

    Hi there, I have a negative binomial model of count data with an offset (total counting effort) in R: ...

    Started by stikbeard‎, 11-05-2013 02:38 PM
    negative binomial, null hypothesis, r help
    • Replies: 0
    • Views: 1,936
    11-05-2013, 02:38 PM Go to last post
  7. Confidence Intervals for predicted values

    Hu Guys, I hope you could provide hints to put me on the right track. A scholar has devised a device to measure the momentum of inertia (Mi) of...

    Started by gianmarco‎, 10-21-2013 05:02 AM
    • Replies: 10
    • Views: 4,212
    11-05-2013, 01:17 PM Go to last post
  8. [ self-selection - nonresponse bias] 65% of population answered survey

    Dear TalkStatstters, I want to investigate possible wage gaps between different groups of people with doctorate degree, in my region. So, I have...

    Started by lukeskywalker84‎, 11-02-2013 11:04 AM
    bias, response, self-selection, survey data
    • Replies: 3
    • Views: 2,416
    11-05-2013, 08:25 AM Go to last post
  9. how to assess the influence of these two variables on this score?

    Hello, this is my case: I have the follow variables: clinical condition: yes/no, smoke: yes/no: test score; continuos variable, in my case it gos...

    Started by Rerun‎, 11-04-2013 07:08 AM
    • Replies: 3
    • Views: 2,036
    11-04-2013, 08:00 AM Go to last post
  10. Multiple Regression Equation Analysis for Percentage?

    Hi, I am hoping someone can help me understand something. I have the following multiple regression equation (note thse numbers are just an example...

    Started by abe333200‎, 11-02-2013 02:02 PM
    • Replies: 4
    • Views: 2,809
    11-02-2013, 02:36 PM Go to last post
  11. Spunky's idea of Weighted Least Squares

    hey! sorry for the late post. i didn't end up coming back yesterday until late at night (as usual, lol) but i really wish to clarify whatever...

    Started by spunky‎, 10-29-2013 01:04 PM
    • Replies: 13
    • Views: 2,850
    11-01-2013, 11:37 AM Go to last post
  12. A regression problem with optional treatment

    I have an interesting problem here and really need your suggestion to analyze the data in a proper way. In 2012 we collected data about retention...

    Started by Blain Waan‎, 11-01-2013 03:48 AM
    hypothesis testing, logistic regression
    • Replies: 0
    • Views: 1,431
    11-01-2013, 03:48 AM Go to last post
  13. Aggregating or Pooling Multinomial Logistic Regression Coefficients

    I'm trying to recreate the MNL analysis like this paper or this one. In Excel I have a sheet with my choice column which contains the market share...

    Started by airflorida‎, 10-29-2013 12:09 AM
    logistic regression
    • Replies: 1
    • Views: 1,628
    10-31-2013, 05:35 PM Go to last post
  14. Difference-in-difference testing

    Hi folks -- Never posted to this forum before, so forgive me if I make an error or three. I'm trying to conceive of how to do significance...

    Started by ultros‎, 10-31-2013 04:49 PM
    • Replies: 0
    • Views: 2,058
    10-31-2013, 04:49 PM Go to last post
  15. 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: 8,286
    10-31-2013, 12:56 PM Go to last post
  16. cumulative odds ratios - additive or exponential?

    I have run some regression models that examine the effect of variable X (a 15 point continuous scale) on Y (a binary variable - didn't perform/did...

    Started by Marvelli‎, 10-30-2013 11:16 AM
    logistic regression, odds ratio
    • Replies: 3
    • Views: 3,215
    10-31-2013, 11:49 AM Go to last post
  17. how to detect outliers for logistic regression model

    Hello, I am working on a logistic regression model. For several continuous variables, I need to detect outliers. What shall I do to detect outliers?I...

    Started by t.wang21@yahoo.com.au‎, 10-29-2013 06:01 AM
    • Replies: 3
    • Views: 9,647
    10-31-2013, 08:11 AM Go to last post
  18. stronger beta in multivariate than in univariate regression?

    Hi, I have a problem interpretig univariate vs multivariate regression. I have a dependent variable and want to analyze what factors independently...

    Started by crudo‎, 10-31-2013 08:00 AM
    • Replies: 1
    • Views: 4,512
    10-31-2013, 08:04 AM Go to last post
  19. substitutes/complements

    Hi! I have a problem to conclude if variables are substitutes or complements. In regression, varible A has positive effect, variable B has negative...

    Started by johnny009‎, 10-31-2013 04:41 AM
    • Replies: 0
    • Views: 1,801
    10-31-2013, 04:41 AM Go to last post
  20. Variables in Stock Trading System

    Hey guys I have designed an application to allow me to test certain variables in a stock trading system, i.e. to determine which variables cause the...

    Started by matthewnyc‎, 10-30-2013 10:13 PM
    • Replies: 0
    • Views: 1,788
    10-30-2013, 10:13 PM Go to last post
  21. Dummy coding in linear regression, with an interaction

    I am using linear regression with a categorial variable (3 levels of stress manipulation) and continuous variables. I am unsure how to dummy code my...

    Started by Liz4218‎, 10-06-2013 03:08 AM
    • Replies: 1
    • Views: 4,179
    10-30-2013, 09:29 PM Go to last post
  22. 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: 8,157
    10-30-2013, 11:59 AM Go to last post
  23. Ordered Probit Diagnostics.

    Hello everyone, I'm dealing wth an ordered probit model, I need now to test the different specifications of my model, but I've not clear ideas on...

    Started by hamidreza‎, 10-30-2013 11:48 AM
    • Replies: 0
    • Views: 3,029
    10-30-2013, 11:48 AM Go to last post
  24. Multiple Regression - Variable variation and Beta estimation

    Dear all, First thing first, thank you for looking at this post. I have looked on the website but could not find at I am after. Regression...

    Started by Pierrick‎, 10-29-2013 06:32 PM
    • Replies: 0
    • Views: 1,214
    10-29-2013, 06:32 PM Go to last post
  25. Introduction of Heteroscedasticity with additional variable

    Hi everyone, I am running an analysis in which I am also checking for heteroscedasticity of my data. The tests tell me that I have...

    Started by Cunner‎, 10-29-2013 02:46 AM
    • Replies: 3
    • Views: 1,545
    10-29-2013, 08:19 AM Go to last post
  26. Common method bias linear regression

    I have an article for resubmission where the reviewer writes: "For example, you could test a CFA model in which you add an orthogonal method...

    Started by Kristina.s‎, 10-25-2013 03:11 PM
    • Replies: 2
    • Views: 2,367
    10-28-2013, 07:03 AM Go to last post
  27. Logistic regression with interactions

    Hi, I've asked this question already on another forum, but nobody has been able to answer, so I try it here. Because of my inexperience with...

    Started by JosefOndrej‎, 10-20-2013 06:36 AM
    logistic regression
    • Replies: 2
    • Views: 1,639
    10-27-2013, 02:35 PM Go to last post
  28. Collinearity in multivariate regression trees.

    Hi, I m new here and I am looking for help with my analysis. I have performed a multivariate regression tree using 8 variables as response and 10...

    Started by Valreg‎, 10-24-2013 10:42 AM
    • Replies: 0
    • Views: 2,262
    10-24-2013, 10:42 AM Go to last post
  29. Cool Logit model fails - collinearity between categoricals. How to fix?

    Hello all! I have a logistic regression model where I'm trying to determine the effects of two categorical variables. However, one of the...

    Started by nbread‎, 10-23-2013 05:39 PM
    • Replies: 0
    • Views: 1,408
    10-23-2013, 05:39 PM Go to last post
  30. Interaction Terms: Logistic Regression

    Dear forum, trying again... I would really like some advice on the proper construction and interpretation of a small experiment and analysis...

    Started by rclukey‎, 10-23-2013 12:02 PM
    interaction terms, logistic, regression
    • Replies: 7
    • Views: 3,100
    10-23-2013, 05:33 PM Go to last post
  31. Adjust for which confounders

    Hello! I have done a logistic regression to compare pregnancy rates amongst various ordinal categories of a specific blood hormone measurement....

    Started by t3nnam‎, 10-23-2013 04:22 AM
    • Replies: 4
    • Views: 2,582
    10-23-2013, 10:58 AM Go to last post
  32. no observations r(2000)

    Hi All, I ran the code below and it returned an error saying "no observations". Does anyone know what this means? I do not have a great number of...

    Started by Windows7‎, 10-23-2013 10:18 AM
    • Replies: 0
    • Views: 1,114
    10-23-2013, 10:18 AM Go to last post
  33. Logistic regression probabilities

    Hi I have built a logistic regression model that predicts the response probability from a marketing campaign. The model ranks correctly (i.e. the...

    Started by JMvS‎, 10-22-2013 05:36 AM
    link function, logistic regression, logit
    • Replies: 4
    • Views: 1,586
    10-23-2013, 07:57 AM Go to last post
  34. How to interpret Multiple Linear Regression Output from SPSS

    Hi All, I have completed a multiple linear regression in SPSS and I need a bit of help interpreting the results. dependent variable-score of...

    Started by chiccaboom‎, 10-23-2013 01:43 AM
    • Replies: 0
    • Views: 2,069
    10-23-2013, 01:43 AM Go to last post
  35. 4PL Non-Linear Regression, Transforming observed y values

    Good Afternoon, I'm currently teaching my self how to fit response curves, and have run into some trouble. I currently need assistance on...

    Started by BrainExploding‎, 10-21-2013 03:34 PM
    4pl, curve fitting, log transformation, non-linear regression, response curve
    • Replies: 7
    • Views: 4,995
    10-22-2013, 12:33 PM Go to last post
  36. Multiple Linear Regression with categorical interaction?

    HI All, I'm not sure if what I am doing is correct. I have a continuous exposure variable, a continuous outcome variable and another variable...

    Started by chiccaboom‎, 10-21-2013 11:53 PM
    • Replies: 2
    • Views: 2,077
    10-22-2013, 08:51 AM Go to last post
  37. Regressions questions

    Hi guys. I tried this questions for my quiz last night and did really badly. I am not sure about the answers. I got 0.672, 1.771(I'm not sure about...

    Started by willy0625‎, 10-21-2013 06:41 PM
    • Replies: 2
    • Views: 1,844
    10-21-2013, 06:57 PM Go to last post
  38. 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: 6,908
    10-21-2013, 08:11 AM Go to last post
  39. Correlation between four parameters

    Dear memebers, I need to make correlation between four parameters; how can I do it and by which outil it's possible? Can someone please tell me...

    Started by sld312‎, 10-20-2013 08:12 AM
    • Replies: 1
    • Views: 2,136
    10-20-2013, 12:32 PM Go to last post
  40. Checking assumptions for interaction terms? too confusing.. please help.

    I am checking assumptions and outliers before running moderated regression analysis. I wonder if I should check normality, linearity, and equal...

    Started by Ilikespring‎, 10-18-2013 11:40 PM
    • Replies: 3
    • Views: 3,491
    10-19-2013, 05:21 PM Go to last post
  41. Issues with cutoff value and interpretation of Exp (B)

    Hello again :). Coming back with my log.regression analysis's issues, which i have 2 for the moment. 1. When i run log.regression i need to...

    Started by badibad‎, 10-17-2013 01:46 AM
    • Replies: 0
    • Views: 1,476
    10-17-2013, 01:46 AM Go to last post
  42. Large part of population sampled with logistic regression

    Hi all, Back from a hiatus with a question. I'm doing an analysis on survey data on commuting to work. We're interested in the factors that...

    Started by Junes‎, 10-16-2013 07:41 PM
    • Replies: 4
    • Views: 1,413
    10-16-2013, 09:20 PM Go to last post
  43. Combining several regression

    Sorry for this simple, maybe idiotically so, question :) I'm trying to make a very basic model for basketball, though the sport doesn't really...

    Started by donkstafari‎, 10-13-2013 12:16 PM
    • Replies: 1
    • Views: 1,409
    10-14-2013, 11:24 AM Go to last post
  44. logistic regression predicted values and confidence interval

    Hello I have run a logistic regression with two independent variables. I have used transformed my y(sales) and my x1(population) and x2(water). I...

    Started by mostats00‎, 10-13-2013 03:19 AM
    confidence interval, logistic regression, predicted value
    • Replies: 0
    • Views: 1,577
    10-13-2013, 03:19 AM Go to last post
  45. Interpretaing the coefficients of polynomial regression and multiple regression.

    How do i interpret the coefficients of the 2nd degree polynomial regression model: (crop yield)=1.22+2.1(Nitrogen doses)+3.1(Nitrogen doses)^2 ...

    Started by akash_ansari‎, 10-10-2013 08:10 PM
    multiple regression, polynomial regression
    • Replies: 4
    • Views: 1,416
    10-12-2013, 08:00 AM Go to last post
  46. Advice is needed about log.regression and research group

    hello, I have started my first journey to logistic regression, and i have already got my first problem. so, my SPSS merged file contains: -...

    Started by badibad‎, 10-11-2013 01:48 PM
    • Replies: 8
    • Views: 1,379
    10-11-2013, 04:51 PM Go to last post
  47. Non normal residuals

    Hi everyone. Im rookie in this forum and also in regression analysis so i hope there I will be able find the help :) I created OLS multivariable...

    Started by trenekas‎, 10-11-2013 08:04 AM
    residuals non-normal
    • Replies: 3
    • Views: 1,924
    10-11-2013, 09:00 AM Go to last post
  48. Want to plot line to subgroups for relation between one of the IV and the DV

    Hi all, I will try to explain my case as detailed as I'm able to... I have measured on 11 plant species. I want to know the determinants of...

    Started by Steefann‎, 10-11-2013 06:27 AM
    ancova, interaction, multiple regression
    • Replies: 0
    • Views: 952
    10-11-2013, 06:27 AM Go to last post
  49. Can logistic regression give opposite results than univariate analyses?

    Dear anyone I am studying the risk for taking drug X. My study population includes >500 people. I have a list of variables (gender, age…)...

    Started by loedrup.ab‎, 10-09-2013 08:56 AM
    • Replies: 4
    • Views: 2,732
    10-11-2013, 03:25 AM Go to last post
  50. Interpreting log-linear model

    I am having some difficulties interpreting my regression results. I have a log-linear model. My dependent variable is a “time spent with children”...

    Started by Limen‎, 10-09-2013 09:49 AM
    • Replies: 1
    • Views: 1,731
    10-11-2013, 01:47 AM Go to last post
  51. Stationarity in regression

    This is much a time series question as a regression one, but I work a lot with regression using time series data these days. I am running regression...

    Started by noetsi‎, 10-10-2013 09:59 AM
    • Replies: 4
    • Views: 3,800
    10-10-2013, 12:09 PM Go to last post
  52. Regression involving likert scale response

    Hi, I am trying to carry out regression analysis. I would like my dependent variable to be a Yes/No type, and my independent variables to be...

    Started by sparkeymd‎, 09-11-2013 12:50 PM
    likert scale analysis, regression
    • Replies: 8
    • Views: 2,946
    10-09-2013, 08:57 PM Go to last post
  53. Logistic Regression with unequal proportions

    Hello With the help of this forum I'm getting my head around logistic regression. My data contains a survived/died response and within the...

    Started by scotchpie‎, 10-08-2013 02:30 AM
    • Replies: 7
    • Views: 2,340
    10-09-2013, 03:06 PM Go to last post
  54. Assessing the Fit of a model: multiple regression

    Hi Guys I'm not sure whether this question belongs to this section or in SAS. I'm using SAS to create a regression model for a response variable...

    Started by excelmac‎, 09-29-2013 03:32 PM
    • Replies: 9
    • Views: 1,875
    10-09-2013, 08:41 AM Go to last post
  55. Saving regression coefficients in a loop and drawing a histogram

    hey i need help with the following task i have to do for university: I have a data set and should in a first step produce a random sample with 100...

    Started by Frank88‎, 10-09-2013 04:08 AM
    • Replies: 2
    • Views: 1,341
    10-09-2013, 07:58 AM Go to last post
  56. Robust standard errors.

    When your model has heteroskedasticity, is it "enough" to specify your model to have robust se? With a large number of obs.

    Started by Limen‎, 10-08-2013 10:48 AM
    • Replies: 3
    • Views: 2,089
    10-08-2013, 09:02 PM Go to last post
  57. comparing regression coefficients among many groups

    Hi all, first of all, sorry for my poor English since I'm not native English speaker, I have this simple OLS regression equation model with one...

    Started by bomool‎, 09-23-2013 05:09 AM
    compare coeff / groups
    • Replies: 2
    • Views: 2,135
    10-08-2013, 06:05 AM Go to last post
  58. How do you intrepret coefficients in logistic regression?

    I am studying whether opinion polls predict presidential elections in one course project. The data I have is of following kind. I have a binary...

    Started by El Pollo‎, 10-07-2013 05:14 PM
    • Replies: 3
    • Views: 2,471
    10-08-2013, 04:35 AM Go to last post
  59. Does the standard error of the regression not need to be corrected by n?

    The standard error of an estimator is defined as the square root of the the estimator variance (or mean squared error (MSE) for unbiased estimators)....

    Started by Econstats‎, 10-07-2013 01:15 PM
    ols, standard error, sum of square type, variance
    • Replies: 2
    • Views: 1,122
    10-07-2013, 01:49 PM Go to last post
  60. unstandardised coeffcients value over 1.0?

    Hello all First post from somebody who uses stats for work but not a statistician Dumb question perhaps, but if my multiple regression...

    Started by NT5224‎, 10-07-2013 01:44 AM
    • Replies: 4
    • Views: 1,471
    10-07-2013, 10:55 AM Go to last post

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