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Forum: Regression Analysis

Linear regression, linear models, nonlinear regression

  1. 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 12:44 PM
    • Replies: 3
    • Views: 1,500
    08-07-2014, 02:17 PM Go to last post
  2. 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 09:31 PM
    • Replies: 1
    • Views: 987
    08-07-2014, 09:33 PM Go to last post
  3. 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 02:09 PM
    • Replies: 3
    • Views: 1,224
    08-08-2014, 12:33 AM Go to last post
  4. 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 01:46 AM
    • Replies: 0
    • Views: 1,004
    08-08-2014, 01:46 AM Go to last post
  5. 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 04:05 AM
    restricted cubic splines
    • Replies: 0
    • Views: 2,636
    08-08-2014, 04:05 AM Go to last post
  6. 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 01:23 PM
    • Replies: 0
    • Views: 1,588
    08-08-2014, 01:23 PM Go to last post
  7. 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 01:49 PM
    • Replies: 0
    • Views: 2,277
    08-08-2014, 01:49 PM Go to last post
  8. 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 03:37 AM
    cooks distance, outlier detection
    • Replies: 9
    • Views: 10,306
    08-08-2014, 10:18 PM Go to last post
  9. 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 07:11 AM
    logistic regression, quasi-elasticities, r-statisitcs
    • Replies: 0
    • Views: 1,255
    08-09-2014, 07:11 AM Go to last post
  10. 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 07:57 PM
    • Replies: 2
    • Views: 1,515
    08-09-2014, 08:41 AM Go to last post
  11. 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 08:55 AM
    • Replies: 1
    • Views: 1,143
    08-09-2014, 11:18 AM Go to last post
  12. 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 10:22 PM
    interaction, moderation, process, regression, significance
    • Replies: 0
    • Views: 3,182
    08-09-2014, 10:22 PM Go to last post
  13. 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 06:58 AM
    dummy-variable, regression
    • Replies: 0
    • Views: 1,187
    08-10-2014, 06:58 AM Go to last post
  14. 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, 08-09-2014 11:45 PM
    • Replies: 7
    • Views: 1,974
    08-10-2014, 08:42 AM Go to last post
  15. 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 06:09 AM
    • Replies: 2
    • Views: 2,732
    08-11-2014, 10:12 AM Go to last post
  16. 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 05:04 PM
    • Replies: 9
    • Views: 2,473
    08-11-2014, 08:51 PM Go to last post
  17. 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
  18. 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
  19. 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: 1,671
    08-12-2014, 01:00 PM Go to last post
  20. 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
  21. 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
  22. 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
  23. 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
  24. 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
  25. 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
  26. 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
  27. 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: 2,159
    08-14-2014, 10:52 PM Go to last post
  28. 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
  29. 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
  30. 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
  31. 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
  32. 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
  33. 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: 954
    08-18-2014, 02:22 PM Go to last post
  34. 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
  35. 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: 1,245
    08-20-2014, 04:01 AM Go to last post
  36. 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: 2,053
    08-20-2014, 01:52 PM Go to last post
  37. 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
  38. 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
  39. 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
  40. 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
  41. 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
  42. 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
  43. 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
  44. 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
  45. 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
  46. 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
  47. 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
  48. 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
  49. 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
  50. 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
  51. 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: 1,239
    08-30-2014, 04:53 AM Go to last post
  52. 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
  53. 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
  54. 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: 2,287
    09-03-2014, 05:49 AM Go to last post
  55. 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
  56. 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
  57. 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
  58. 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
  59. 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
  60. 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

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