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Forum: Regression Analysis

Linear regression, linear models, nonlinear regression

  1. Overdispersions and logistic regression

    Note the following comment on this: I have never been clear what the difference between grouped and ungrouped data is. My elements, notably...

    Started by noetsi‎, 09-19-2014 09:26 AM
    • Replies: 8
    • Views: 4,147
    09-20-2014, 08:04 AM Go to last post
  2. Adjusted R-squared

    Hi, I have a few questions. If I am doing linear regression with only one independent variable, is it ever viable to present an adjusted...

    Started by haralds‎, 09-18-2014 01:57 PM
    bootstrap simulation, linear regression
    • Replies: 6
    • Views: 2,486
    09-19-2014, 09:55 PM Go to last post
  3. Testing whether two related slopes/intercepts are different from each other

    Hi, I'm new and stuck. I want to see if the intercepts and slopes of two linear regression lines are significantly different. I thought I found...

    Started by Proinsias‎, 09-18-2014 08:39 PM
    intercept, intercept p value, linear regression, mancova, significance
    • Replies: 10
    • Views: 2,496
    09-19-2014, 01:43 AM Go to last post
  4. how to calculate R values

    Hello members, I have no of observation (n), no of predictors(k) and stand error of estimation(se). Can it be possible to calculate R or RSquare...

    Started by sb1‎, 09-18-2014 07:47 AM
    • Replies: 1
    • Views: 1,467
    09-18-2014, 11:31 AM Go to last post
  5. Question Coefficient of determination interpretation

    Hey guys, this my first post in here so hello everyone:) I have a question regarding the coefficient of determination. Wikipedia says: An...

    Started by bgst‎, 09-09-2014 07:51 AM
    • Replies: 4
    • Views: 2,042
    09-17-2014, 04:58 PM Go to last post
  6. Assumption of Linearity not fulfilled - what to do?

    Dear All, I want to conduct a moderated hierarchical regression. I have 3 IVs and one moderator. I started to test the underlying assumptions of...

    Started by bluemuly‎, 09-17-2014 06:02 AM
    • Replies: 1
    • Views: 3,393
    09-17-2014, 02:53 PM Go to last post
  7. Help to prove the relationship of regression coefficients of total data and sub-data

    Hello, The regression of total data set is:Y=aX+b0 The total data set is divided to two data sets. The regressions of the two sub data sets are:...

    Started by Samuel1204‎, 09-15-2014 12:34 PM
    • Replies: 8
    • Views: 2,311
    09-16-2014, 11:44 PM Go to last post
  8. Geometric Slope

    I am reading a paper that in the "Methods", it is only stated multiple linear regression conducted. In the results it reports the "geometric slopes"...

    Started by hlsmith‎, 09-15-2014 11:29 AM
    • Replies: 2
    • Views: 1,584
    09-15-2014, 11:57 AM Go to last post
  9. Exclamation Interpretating poisson regression output correctly to wirte in results from R

    Hi. I've done a poisson regression on count data in r. I need to write up the results for it but have very little idea where to start because the p...

    Started by Francesca.123‎, 09-14-2014 07:13 AM
    glm regression, output, poisson, r-statisitcs, results
    • Replies: 0
    • Views: 2,262
    09-14-2014, 07:13 AM Go to last post
  10. Question Regression with 0 intercept

    Hi, I'm taking a regression analysis class and its been a while since I took calc (a few years ago) and Im having some trouble with doing proofs of...

    Started by SilverStars‎, 09-13-2014 02:06 PM
    • Replies: 3
    • Views: 2,016
    09-14-2014, 12:51 AM Go to last post
  11. regression or remosre??!!

    what are the differences between remorse and regression????????????????????

    Started by haraharae‎, 09-12-2014 12:51 PM
    • Replies: 8
    • Views: 3,614
    09-13-2014, 05:19 AM Go to last post
  12. Preliminary Analysis in MultiLevel Analysis

    Hallo there, my name is David. I am currently trying to do a multi level analysis. I am attempting a simple multilevel analysis. One of my...

    Started by David_D‎, 09-13-2014 03:33 AM
    • Replies: 0
    • Views: 1,102
    09-13-2014, 03:33 AM Go to last post
  13. Analytical solution to correlation between two linear combinations of values

    Greetings, Suppose I have two linear combinations of values as follows: Y1 = B11*X1 + B12*X2 + B13*X3 Y2 = B21*X1 + B22*X2 + B23*X3 where...

    Started by BigBugBuzz‎, 09-12-2014 03:39 AM
    analytical solution, correlation
    • Replies: 3
    • Views: 1,741
    09-12-2014, 02:00 PM Go to last post
  14. Smile Logistic regression vs GLMM

    Hello, I'd like to ask you for help with a choice of correct model for my analysis. Here is the problem: 1.) I should find out whether the risk of...

    Started by Heisenberg1‎, 09-11-2014 05:00 AM
    • Replies: 0
    • Views: 1,325
    09-11-2014, 05:00 AM Go to last post
  15. Smile non linear least squares

    Hi everybody. I need some help with this: I am fitting some data about mortality to some hazard funtions like weibulll, lognormal, logistic...

    Started by sanmath‎, 09-10-2014 09:33 PM
    #non linear least squares
    • Replies: 0
    • Views: 1,140
    09-10-2014, 09:33 PM Go to last post
  16. Choice of final model

    There are many strategies for selecting a final model (and which variables are in the final model will likely influence the SE and the coefficients)....

    Started by noetsi‎, 09-09-2014 10:12 AM
    • Replies: 11
    • Views: 2,578
    09-10-2014, 11:55 AM Go to last post
  17. Correlation for different level of volatility

    Hi, I need to estimate correlation between 2 variables across quantiles of volatility (volatility is an independent variable).. I want to show how...

    Started by Nour‎, 09-09-2014 11:37 AM
    • Replies: 0
    • Views: 1,382
    09-09-2014, 11:37 AM Go to last post
  18. Probability distribution of a prediction

    Hi all, I'm a newbie here so apologies if I missed a similar thread. Looked for it, but couldn't find it. Let's say I've estimated a linear model...

    Started by tetrapod‎, 09-09-2014 08:28 AM
    • Replies: 0
    • Views: 1,084
    09-09-2014, 08:28 AM Go to last post
  19. Question Interpretation of interaction variables

    Hi everyone I have two datasets A and B with mutually exclusive observations and I run two identical regressions (x = y) for A and B each...

    Started by gsgcharles‎, 09-08-2014 11:20 PM
    • Replies: 0
    • Views: 1,435
    09-08-2014, 11:20 PM Go to last post
  20. cox regression

    I am new to this method, so I started this thread for questions on it. :p Some discussions of Cox treat it as a counting process and others do...

    Started by noetsi‎, 09-08-2014 08:35 AM
    • Replies: 4
    • Views: 2,149
    09-08-2014, 02:16 PM Go to last post
  21. Poisson regression

    Hello, im analyzing an article for my studies with the hypothesis if a change in work motivation ist related with a change in mental well being...

    Started by mia maria‎, 09-08-2014 10:06 AM
    • Replies: 0
    • Views: 1,556
    09-08-2014, 10:06 AM Go to last post
  22. compare beta subgroup from total group - two dummy variables

    My plain regression looks as follows: tendaystockreturn = alpha + beta * dummy variable that takes a value of 1 in case a director purchases...

    Started by smoyf1992‎, 09-04-2014 01:42 PM
    dummy compare inter
    • Replies: 1
    • Views: 2,107
    09-04-2014, 01:47 PM Go to last post
  23. Simple Linear Regression with Transformed Variables

    I ran a simple linear regression (length of stay predicts cost). I natural log transformed both the dependent and independent variables. I am...

    Started by hlsmith‎, 09-02-2014 03:36 PM
    • Replies: 3
    • Views: 2,289
    09-03-2014, 05:49 AM Go to last post
  24. Supervised learning on sporting events (Data prep)

    I'm playing around with the prediction of sporting events, my data looks something like this. A single row for each team and the stats. Team ...

    Started by qwirky64‎, 09-01-2014 03:55 AM
    • Replies: 2
    • Views: 1,274
    09-02-2014, 01:42 AM Go to last post
  25. Can the PCA scores be used as variables in multiple linear regression

    Hello, I used PCA to reduce the dimensions of a data set of 10 variables into 2 principal components (describing 82% of variance in data set of 10...

    Started by Deccantraps‎, 08-27-2014 06:49 PM
    multiple regression, pca
    • Replies: 6
    • Views: 1,893
    08-31-2014, 04:04 AM Go to last post
  26. Confused: Mixed model, step-wise regression, testing for random effects

    Dear all, I want to perform a MLR (mixed model) on a data set (details below) that has both numeric and categorical explanatory variables. The...

    Started by Deccantraps‎, 08-30-2014 04:53 AM
    mixed model, mlr
    • Replies: 0
    • Views: 1,240
    08-30-2014, 04:53 AM Go to last post
  27. Regression Using Interaction Terms - PANEL DATA

    Good afternoon, I am working with a panel data with more than 2000 observations and only two years. My topic is on "Full Risk Insurance" in...

    Started by Guy Salgado‎, 08-29-2014 01:02 PM
    index variable, interaction terms, interaction variables, panel fixed effects, regression coefficients
    • Replies: 0
    • Views: 1,504
    08-29-2014, 01:02 PM Go to last post
  28. Mixed Model Regression in SPSS

    Hello, I have a random group of participants that answered questions on a survey regarding their general opinions on specific health activities....

    Started by nicoled3145‎, 08-28-2014 07:58 AM
    fixed effects regression, mixed models, random effects regression, regression, spss
    • Replies: 0
    • Views: 1,259
    08-28-2014, 07:58 AM Go to last post
  29. Pasimonious Model for Neural Networks forecasting, I am really confusing.

    Hello People I recently studied Neural Networks forecasting and some interesting question arose while I am reading various articles on the net. ...

    Started by auto9817‎, 08-27-2014 06:56 PM
    • Replies: 0
    • Views: 1,153
    08-27-2014, 06:56 PM Go to last post
  30. Use of factor analysis + regression

    Independent Variable: I have a survey of 50 states indicating the amount of control the state board of education has in 31 areas answered on a three...

    Started by cynicalflyer‎, 08-19-2014 11:49 AM
    • Replies: 6
    • Views: 2,849
    08-26-2014, 05:15 PM Go to last post
  31. Non-parametric regression

    I am relatively new to this so excuse my ignorance. As best I can tell non-parametric regression has no coefficients (no slopes). It does have...

    Started by noetsi‎, 08-25-2014 03:02 PM
    • Replies: 8
    • Views: 1,771
    08-26-2014, 10:25 AM Go to last post
  32. Linear or non-linear regression model

    Hi, I have 20 independent variables and 1 dependent. I've used the stepwise method to determined what predictors are more significant compared to...

    Started by djordje‎, 08-25-2014 10:58 PM
    important predictors, nonlinear regression, stepwise, type of regression
    • Replies: 1
    • Views: 1,410
    08-26-2014, 12:31 AM Go to last post
  33. Comparing 2 best fit lines for 2 halves of a data set

    I have a data set with ~200 coordinates plotted on a scatter plot. I can either use the data set as is, or split this plot into two data sets along a...

    Started by player100200‎, 08-25-2014 06:13 PM
    goodness of fit, regression
    • Replies: 0
    • Views: 975
    08-25-2014, 06:13 PM Go to last post
  34. Regression where IV/predictor is a proportion, bounded by 0 and 1

    Hi, I know that if the outcome variable is a proportion, I'd need to run a beta regression, but can anyone advise on running a regression where...

    Started by morning_sun‎, 08-25-2014 07:32 AM
    proportion, regression
    • Replies: 0
    • Views: 1,283
    08-25-2014, 07:32 AM Go to last post
  35. Statistical Analysis help for thesis - Correlation, Probit, Tobit and Moderation

    Hello Talkstats users! I am writing here cause I need some guidance on my statistical analysis which has turned out far too complex for my...

    Started by Uni_student‎, 08-25-2014 05:42 AM
    correlation, moderation, probit, tobit
    • Replies: 0
    • Views: 1,288
    08-25-2014, 05:42 AM Go to last post
  36. Which approach to use? Repeated measures with a covariate

    Hi, I hope that someone can give me a pointer please. I am trying to determine which is the most appropriate test to apply to my data. I have...

    Started by morning_sun‎, 08-24-2014 07:44 AM
    ancova, covariate, regression, repeated measures
    • Replies: 0
    • Views: 976
    08-24-2014, 07:44 AM Go to last post
  37. Post Beta NO Intercept purpose

    Hey guys, What would a Beta with NO intercept tell me about a time series model?

    Started by talbobai‎, 08-23-2014 06:19 AM
    beta, beta regression, regresion analysis
    • Replies: 0
    • Views: 1,186
    08-23-2014, 06:19 AM Go to last post
  38. Adding dummy variables let significance of coefficients disappear

    Hi all I have a regression with two variables x1 and x2, both are significant. When I add a dummy variable D (which is significant), one of the...

    Started by weasel‎, 08-22-2014 04:22 AM
    • Replies: 3
    • Views: 2,318
    08-22-2014, 07:14 AM Go to last post
  39. Strong Predictor

    Hi guys! I have a question... I'm trying to fit 4 predictors to regress on abdominal fat. Multicollinearity was checked for, and all the other...

    Started by gene2420‎, 08-21-2014 02:37 PM
    • Replies: 3
    • Views: 1,826
    08-22-2014, 02:27 AM Go to last post
  40. Are there model specification tests for Two Stage Least Squares (2SLS)?

    Question. Are there model specification tests for Two Stage Least Squares (2SLS)? I am trying to estimate the parameters (B1, B2, B3) of the...

    Started by Socks‎, 08-21-2014 01:23 AM
    • Replies: 0
    • Views: 1,322
    08-21-2014, 01:23 AM Go to last post
  41. Question Regression confusion

    I am looking at relationship between GHQ12 and treatment. Just wondering is it suitable to do regression analysis on this? But which would be my...

    Started by nmm‎, 08-20-2014 07:58 AM
    • Replies: 3
    • Views: 2,054
    08-20-2014, 01:52 PM Go to last post
  42. Linear regression, and scatter plot

    Hi for everyone, i have some difficulties with interpretation of the regressions, probably linear, i am a lawyer so for me it is quite difficult to...

    Started by HagaMaga‎, 08-20-2014 04:01 AM
    • Replies: 0
    • Views: 1,246
    08-20-2014, 04:01 AM Go to last post
  43. problem with linear multiple regression in R

    Hi, I have a problem to build and to explain the linear multiple regression. I have a data set called Cars93 with 26 variables and 93...

    Started by angersan‎, 08-18-2014 03:32 PM
    • Replies: 0
    • Views: 1,058
    08-18-2014, 03:32 PM Go to last post
  44. mixed predicator types for building logistic regression model

    There has a data set, some predicator variables are of categorical types, such as X1={A, B,C}; X2={1, 2, 3}; and other predicator variables are of...

    Started by winecoding‎, 08-18-2014 02:22 PM
    categorical dependent, logistic regression, variable selection
    • Replies: 0
    • Views: 955
    08-18-2014, 02:22 PM Go to last post
  45. Question Multivariate Regression when Independent Variables could have Dependencies

    First post, have looked and could not find this question elsewhere. Struggling with this so hopefully someone can help. I am trying to predict the...

    Started by GTsn311‎, 08-18-2014 11:08 AM
    interdependence, multivariable, regression
    • Replies: 0
    • Views: 861
    08-18-2014, 11:08 AM Go to last post
  46. Linear regression with an interaction variable

    I have a linear regression model: Dependent variable = α + independent variable 1 (continuous variable) + independent variable 2 (categorical) +...

    Started by VicB‎, 08-18-2014 10:30 AM
    • Replies: 0
    • Views: 1,308
    08-18-2014, 10:30 AM Go to last post
  47. linear specification vs. logarithmic specification

    Dear all When I do a box-cox test to evaluate whether to use a logarithmic transformation for my dependent variable (which are IRRs, and the...

    Started by weasel‎, 08-18-2014 07:29 AM
    • Replies: 2
    • Views: 1,191
    08-18-2014, 07:48 AM Go to last post
  48. Multiple Linear Regression Problem

    Hi, I want to do a multiple regression analysis. I have one Y which are numeric values (sample number = 85) and the following Xs. Sr...

    Started by Deccantraps‎, 08-17-2014 11:37 PM
    multiple regression, stepwise
    • Replies: 1
    • Views: 899
    08-18-2014, 01:13 AM Go to last post
  49. The absolute dependence in panel data

    Hello, I want to ask something related to the panel data analysis. In traditional regression and correlation analysis, it is clear that if the...

    Started by enchoj‎, 08-13-2014 03:55 AM
    • Replies: 1
    • Views: 1,188
    08-15-2014, 01:39 AM Go to last post
  50. Generalised Linear Model - with negative skewed DV

    Hi All, I am trying to fit a generalised linear model to which the dependant variable is negatively skewed. The DV ranges from 0 to 150 with 45%...

    Started by TheTransporter‎, 08-14-2014 10:52 PM
    • Replies: 0
    • Views: 2,162
    08-14-2014, 10:52 PM Go to last post
  51. Help: Bootstrap Regression (or not)

    I am an ecologist with enough statistics background to know I am confused. The trophic magnification factor (TMF) is a commonly used measure to...

    Started by mudminnow‎, 08-14-2014 10:36 AM
    • Replies: 0
    • Views: 1,062
    08-14-2014, 10:36 AM Go to last post
  52. When to use partial bivariate correlation and when to use multiple linear regression?

    Let's say I have X and Y and wonder how strongly they correlate, but am suspecting that Z is a confounder. What research question would lead me...

    Started by trexter‎, 08-14-2014 07:13 AM
    • Replies: 1
    • Views: 1,043
    08-14-2014, 08:23 AM Go to last post
  53. Interpretation CATREG interaction coefficient

    Hi everybody. I have done an Catreg analyses on my data and have included interaction variables (for example nutrient * sex). However sex is...

    Started by inge1804‎, 08-13-2014 10:01 AM
    • Replies: 2
    • Views: 1,458
    08-14-2014, 01:48 AM Go to last post
  54. Problem/question regarding Cox Regression

    Hello! I am new to statistics and research and am looking for a little help. I am doing a study looking at the the effects of post-operative...

    Started by drronin9790‎, 08-13-2014 04:29 PM
    • Replies: 1
    • Views: 1,126
    08-13-2014, 08:39 PM Go to last post
  55. Moderator regression: plotting graphs from multiple product terms

    This is my first time posting, so apologies if I don't make sense. I've conducted a hierarchical regression analysis. I have multiple IVs whereby...

    Started by pete14678‎, 08-13-2014 10:57 AM
    moderated multiple regres, regression analysis, regression equation
    • Replies: 0
    • Views: 941
    08-13-2014, 10:57 AM Go to last post
  56. Plot for multiple regression

    Hi All, I have a very basic question. When I run a regression to predict Y from X, I basically draw a scatterplot in excel. I am wondering how...

    Started by mac101‎, 08-12-2014 02:48 PM
    multiple regression, regression plot
    • Replies: 9
    • Views: 2,831
    08-12-2014, 06:03 PM Go to last post
  57. Robustness check of univariate results

    Hi all I calculated several univariate regressions with different explanatory variables. Some are significant, while others aren't. Some show the...

    Started by weasel‎, 08-12-2014 04:13 PM
    • Replies: 0
    • Views: 1,705
    08-12-2014, 04:13 PM Go to last post
  58. Cox proportional hazard

    I am trying to understand how to interpret the change in the hazard function for a one unit change in a dummy predictor. I know for a continuous...

    Started by noetsi‎, 08-12-2014 11:06 AM
    • Replies: 3
    • Views: 1,672
    08-12-2014, 01:00 PM Go to last post
  59. Logistic regression, but no negative responses?

    So I am trying to model who is likely, from a list of addresses, to go to a store. I have lots of criteria about the people who have visited my...

    Started by bernstml19‎, 08-11-2014 06:42 PM
    binary data, logistic regression, regression analysis
    • Replies: 5
    • Views: 1,331
    08-12-2014, 10:38 AM Go to last post
  60. Moderated regression - how to create the graph for some (not all) variables.

    I've run into a problem and I was hoping someone could help me out. My research question is whether beliefs about controllability of weight...

    Started by artemisynn‎, 08-12-2014 05:13 AM
    • Replies: 0
    • Views: 1,163
    08-12-2014, 05:13 AM Go to last post

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