1. 10-14-2010
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Forum: Regression Analysis

Linear regression, linear models, nonlinear regression

  1. 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 03:37 PM
    • Replies: 3
    • Views: 788
    08-22-2014, 03:27 AM Go to last post
  2. 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 02:23 AM
    • Replies: 0
    • Views: 545
    08-21-2014, 02:23 AM Go to last post
  3. 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 08:58 AM
    • Replies: 3
    • Views: 786
    08-20-2014, 02:52 PM Go to last post
  4. 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 05:01 AM
    • Replies: 0
    • Views: 430
    08-20-2014, 05:01 AM Go to last post
  5. 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 04:32 PM
    • Replies: 0
    • Views: 635
    08-18-2014, 04:32 PM Go to last post
  6. 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 03:22 PM
    categorical dependent, logistic regression, variable selection
    • Replies: 0
    • Views: 365
    08-18-2014, 03:22 PM Go to last post
  7. 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 12:08 PM
    interdependence, multivariable, regression
    • Replies: 0
    • Views: 361
    08-18-2014, 12:08 PM Go to last post
  8. 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 11:30 AM
    • Replies: 0
    • Views: 479
    08-18-2014, 11:30 AM Go to last post
  9. 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 08:29 AM
    • Replies: 2
    • Views: 497
    08-18-2014, 08:48 AM Go to last post
  10. 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, 08-18-2014 12:37 AM
    multiple regression, stepwise
    • Replies: 1
    • Views: 459
    08-18-2014, 02:13 AM Go to last post
  11. 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 04:55 AM
    • Replies: 1
    • Views: 484
    08-15-2014, 02:39 AM Go to last post
  12. 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 11:52 PM
    • Replies: 0
    • Views: 460
    08-14-2014, 11:52 PM Go to last post
  13. 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 11:36 AM
    • Replies: 0
    • Views: 483
    08-14-2014, 11:36 AM Go to last post
  14. 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 08:13 AM
    • Replies: 1
    • Views: 435
    08-14-2014, 09:23 AM Go to last post
  15. 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 11:01 AM
    • Replies: 2
    • Views: 740
    08-14-2014, 02:48 AM Go to last post
  16. 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 05:29 PM
    • Replies: 1
    • Views: 578
    08-13-2014, 09:39 PM Go to last post
  17. 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 11:57 AM
    moderated multiple regres, regression analysis, regression equation
    • Replies: 0
    • Views: 398
    08-13-2014, 11:57 AM Go to last post
  18. 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 03:48 PM
    multiple regression, regression plot
    • Replies: 9
    • Views: 929
    08-12-2014, 07:03 PM Go to last post
  19. 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 05:13 PM
    • Replies: 0
    • Views: 556
    08-12-2014, 05:13 PM Go to last post
  20. 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 12:06 PM
    • Replies: 3
    • Views: 662
    08-12-2014, 02:00 PM Go to last post
  21. 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 07:42 PM
    binary data, logistic regression, regression analysis
    • Replies: 5
    • Views: 674
    08-12-2014, 11:38 AM Go to last post
  22. 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 06:13 AM
    • Replies: 0
    • Views: 513
    08-12-2014, 06:13 AM Go to last post
  23. What is a "count" in regression

    It is often said that you should use Poisson regression with data that involves counts. But it seems to me that most of data in the social science is...

    Started by noetsi‎, 08-11-2014 06:04 PM
    • Replies: 9
    • Views: 991
    08-11-2014, 09:51 PM Go to last post
  24. PP-Plot

    I sometimes, when doing linear regression get a normal p-p-plot of regression standardized residual that looks like the one below. Can I still use...

    Started by trexter‎, 08-11-2014 07:09 AM
    • Replies: 2
    • Views: 783
    08-11-2014, 11:12 AM Go to last post
  25. Standard Error of Estimate

    I am reading a book called Applied Statistics with Excel by G. Keller. On p593 he wrote Standard Error of Estimate=(SSE/n-k-1)^2, and SSE = sum...

    Started by yma16‎, 08-10-2014 12:45 AM
    • Replies: 7
    • Views: 980
    08-10-2014, 09:42 AM Go to last post
  26. Consequences of wrongly applying dummy variables?

    I was just wondering if there were any consequences to applying dummy variables to independent variables which don't need it. For example, let's...

    Started by l_davies93‎, 08-10-2014 07:58 AM
    dummy-variable, regression
    • Replies: 0
    • Views: 475
    08-10-2014, 07:58 AM Go to last post
  27. Moderation Analysis through Process by Andrew Hayes and SPSS regression analysis

    Hello all, I need help analyzing some data for a moderation analysis. I have a continuous variable (predictor), Exhaustion, a continuous outcome,...

    Started by confooseddesi89‎, 08-09-2014 11:22 PM
    interaction, moderation, process, regression, significance
    • Replies: 0
    • Views: 1,253
    08-09-2014, 11:22 PM Go to last post
  28. Multiple Linear Regression: Coeffiecients are all insignificant - Can someone help?

    Hi together, I carried out a multiple linear Regression (OLS) and the results show me that all my explanatory variables (business model...

    Started by SimonNewbie‎, 08-09-2014 09:55 AM
    • Replies: 1
    • Views: 494
    08-09-2014, 12:18 PM Go to last post
  29. multiple regression if one corrleation variable is linear, other is nonlinear

    Hello, I am working on soil biology. I have a data set of soil CO2 emissions (dependant variable), with a number of other measured variables...

    Started by goolian‎, 08-07-2014 08:57 PM
    • Replies: 2
    • Views: 452
    08-09-2014, 09:41 AM Go to last post
  30. Post How to estimate quasi-elasticities from marginal effects of logistic regression?

    HI everyone, I am new to this forum. I need some help regarding logistic regression analysis. I am using logistic regression for my research. I...

    Started by abiduaf‎, 08-09-2014 08:11 AM
    logistic regression, quasi-elasticities, r-statisitcs
    • Replies: 0
    • Views: 563
    08-09-2014, 08:11 AM Go to last post
  31. cooks distance cutoff

    Hello, I urgently need to find out what is happening in regards to below: I am doing a huge number of simple linear regressions. For each...

    Started by Deccantraps‎, 08-07-2014 04:37 AM
    cooks distance, outlier detection
    • Replies: 9
    • Views: 4,323
    08-08-2014, 11:18 PM Go to last post
  32. interpretation nonlinear regression output

    I have run a linear regression. The independent variable is supposed to have a nonlinear relation with the dependent variable (both variables are...

    Started by rob1‎, 08-08-2014 02:49 PM
    • Replies: 0
    • Views: 529
    08-08-2014, 02:49 PM Go to last post
  33. Reasons for high lambda in ridge regression?

    I've seen a few papers where they use k-fold cross-validation (k=10) to find the optimal lambda. They end up with huge amounts such as 4000. This is...

    Started by l_davies93‎, 08-08-2014 02:23 PM
    • Replies: 0
    • Views: 404
    08-08-2014, 02:23 PM Go to last post
  34. Interpretation of restricted cubic splines' coefficients

    Hi all, I was wondering whether there is a "not-very-obscure" interpretation of the coefficients (in a regression analysis, like logistic...

    Started by Phaedrus‎, 08-08-2014 05:05 AM
    restricted cubic splines
    • Replies: 0
    • Views: 804
    08-08-2014, 05:05 AM Go to last post
  35. basic 3 year's observations forecasting - need for tips and feedback

    Hello everybody, I need advice about simple forecasting strategies and wondered if anyone here could kindly give me feedback. In each of the four...

    Started by parsec2011‎, 08-08-2014 02:46 AM
    • Replies: 0
    • Views: 311
    08-08-2014, 02:46 AM Go to last post
  36. Comparing regression slopes measured two times withinsubjets?

    Although I am not a statistics-newbee, I have no clue how to contrast the following situation against null-hypothesis, i.e. I don't know how to do...

    Started by statQuestions‎, 08-07-2014 03:09 PM
    • Replies: 3
    • Views: 584
    08-08-2014, 01:33 AM Go to last post
  37. Multiple regression then Sobel for mediation

    Hi, I am doing a mediation analysis. I first ran a multiple regression for IV (2 variables) to mediator. I want to do a Sobel test and use the...

    Started by PsychRachel‎, 08-07-2014 10:31 PM
    • Replies: 1
    • Views: 386
    08-07-2014, 10:33 PM Go to last post
  38. Logistic regression p-value significance

    Dear all, I have done logistic regression for 20 independent variables for which all of them are categorical (0 and 1) also 1 binomial response...

    Started by smurts‎, 08-07-2014 01:44 PM
    • Replies: 3
    • Views: 639
    08-07-2014, 03:17 PM Go to last post
  39. Question about standardizing in ridge regression

    Hey guys I found one or two papers which use ridge regression (for basketball data). I was always told to standardize my variables if I ran a ridge...

    Started by l_davies93‎, 08-07-2014 06:13 AM
    • Replies: 0
    • Views: 373
    08-07-2014, 06:13 AM Go to last post
  40. Upper Envelope on XY Data

    Hi There, I am working with a set of data where I get a scatter as shown in the attached image. When looking at the data, I can convince myself...

    Started by ntlegg‎, 08-05-2014 10:57 AM
    • Replies: 3
    • Views: 613
    08-06-2014, 08:13 AM Go to last post
  41. Interaction effect for quadratic relation

    Looking at the outcome of a linear regression (see also the file enclosed), there is an inverted U-shaped relation between ambidexterity and the...

    Started by rob1‎, 08-05-2014 11:13 AM
    • Replies: 2
    • Views: 517
    08-05-2014, 01:11 PM Go to last post
  42. Constant negative fitted values...am I missing something?

    Hello all, I'm attempting to fit a model where y variable is a variety of $/ha/year figures (all positive) ranging between 0.01 and 2520. The...

    Started by samuelle‎, 08-04-2014 08:54 AM
    glm, linear, negative values
    • Replies: 2
    • Views: 423
    08-05-2014, 05:34 AM Go to last post
  43. Testing multiple interaction variables in logistic regression

    Hi everyone, For a study that I'm currently conducting I want to know the effect of some of my variables on other variables, which I think should...

    Started by mjspijker‎, 08-03-2014 07:18 PM
    how to, interaction variables, logistic regression, model selection
    • Replies: 6
    • Views: 786
    08-04-2014, 08:11 PM Go to last post
  44. Appropriate model for (repeated) data

    I have some cross-sectional data, where I'm interested in estimating a relationship between the "number of items in use" in sector i of country j and...

    Started by longshot‎, 08-01-2014 08:58 PM
    regression analysis, regression equation, regression models, repeated cases, repeated measurements
    • Replies: 0
    • Views: 469
    08-01-2014, 08:58 PM Go to last post
  45. Interaction between time and time-varying between-subjects variable

    I'm struggling with how to think about a question that seems like it should be really straightforward. I have some survey data about regrets...

    Started by CowboyBear‎, 07-31-2014 06:52 PM
    • Replies: 6
    • Views: 735
    08-01-2014, 06:35 PM Go to last post
  46. Smile Correlation between two non stationary time series

    Hey everyone, I'm trying to figure out if there is significant correlation between two non stationary time series (e.g. temperature on a a given...

    Started by s_chrodinger‎, 07-28-2014 06:51 PM
    correlation, monte carlo, non-stationary, regression analysis, time series
    • Replies: 9
    • Views: 1,961
    08-01-2014, 03:03 PM Go to last post
  47. Insignificant coefficients. Fixed effects model.

    Dear all, I have a panel data, and I estimate a regression using fixed-effects model (i.e. I use 'xtreg' command in Stata). The regression is as...

    Started by Man‎, 08-01-2014 02:20 PM
    • Replies: 0
    • Views: 945
    08-01-2014, 02:20 PM Go to last post
  48. Bayesian GLM with missing data

    Just while I'm on a roll with simple questions... I'm using MCMCregress {MCMCpack} to do a Bayesian regression in R. My dataset has a good chunk...

    Started by CowboyBear‎, 07-31-2014 07:57 PM
    • Replies: 3
    • Views: 748
    07-31-2014, 10:23 PM Go to last post
  49. Clarifying collinearity

    I am trying to run a regression model where the Y is concentration and predictors are stove type (e.g., stove1, stove 2, stove 3) and fuel type...

    Started by statshelp1234‎, 07-30-2014 06:21 PM
    collinearity, interpret, regression analysis
    • Replies: 3
    • Views: 539
    07-31-2014, 10:46 AM Go to last post
  50. bootstrap validation

    how can we do bootstrap validation in sas?

    Started by nancy10‎, 07-31-2014 09:14 AM
    • Replies: 0
    • Views: 374
    07-31-2014, 09:14 AM Go to last post
  51. Do i need to correct for family wise error when doing moderation and mediation?

    Hi, I've been analyzing data for moderating and mediating relationships and am wondering how necessary it is to correct for family wise error in...

    Started by LisaB‎, 07-30-2014 10:19 PM
    family wise error, mediation, moderation, type i error, type ii error
    • Replies: 0
    • Views: 368
    07-30-2014, 10:19 PM Go to last post
  52. Multivariate repeated measures, binary and continuous

    Hello all. I am working with a data set of multivariate repeated measurements. Specifically, subjects performed an exercise they were taught up to...

    Started by robsncoppers‎, 07-21-2014 04:16 AM
    binary, correlation, hrv, multivariate, regression
    • Replies: 3
    • Views: 616
    07-30-2014, 08:01 PM Go to last post
  53. Bizarre multicollinearity (inferred from VIF) in regression

    I'm really confused about why I have such high VIFs in a multiple regression I've run. My predictors are country (2 different countries, so -1 and...

    Started by psychmajor‎, 07-30-2014 06:39 AM
    multicollinearity, regression, vif
    • Replies: 2
    • Views: 518
    07-30-2014, 05:00 PM Go to last post
  54. Interpreting the regression RMSE when responses are measurements with known SD

    Hi all, I'm fitting a simple regression model (Y = a + bX) where my responses are measurements whose standard deviations, SD, are available....

    Started by fgg‎, 07-19-2014 10:04 PM
    • Replies: 8
    • Views: 2,140
    07-29-2014, 08:11 PM Go to last post
  55. Logistic regression: trouble finding out which variables are significant

    Hi, I'm using logistic regression to analyse a dataset on managerial decision making. Managers have made decisions to fire 2 employees out of a...

    Started by mjspijker‎, 07-29-2014 08:36 AM
    interpreting results, logistic regression, significance
    • Replies: 7
    • Views: 676
    07-29-2014, 07:12 PM Go to last post
  56. How to integrate an interaction term into a fixed effect model?

    Hi, I have a balanced panel data set for t=2. I want to estimate a fixed effects model in the following way: Y= β(0) + β(1)*x + β(2)*z +...

    Started by JB81‎, 07-29-2014 07:21 AM
    • Replies: 0
    • Views: 409
    07-29-2014, 07:21 AM Go to last post
  57. Question about homoscedasticity (for a probably non-linear relation)

    I predict that independent variable X, has an U-shaped relation with dependent variable Y. I test this assumption using a regression analysis...

    Started by rob1‎, 07-28-2014 11:59 AM
    • Replies: 1
    • Views: 521
    07-28-2014, 12:04 PM Go to last post
  58. weight of evidence

    If WOE>0, what does it imply?

    Started by nancy10‎, 07-28-2014 09:11 AM
    • Replies: 0
    • Views: 370
    07-28-2014, 09:11 AM Go to last post
  59. "Averaging" linear trends = linear regression slopes ?

    Hello everyone, I was not able to find a solution for the following question, explaining it with a simple example: We have N=12 weather boxes...

    Started by statQuestions‎, 07-27-2014 05:02 PM
    • Replies: 1
    • Views: 439
    07-27-2014, 06:18 PM Go to last post
  60. correlation of trends?

    Hi, I have extracted trends from two time series (one correspond to some climate parameters, the other one to chemical composition of tree...

    Started by Valido‎, 07-23-2014 04:34 AM
    • Replies: 1
    • Views: 599
    07-27-2014, 05:11 PM Go to last post

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