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Forum: Regression Analysis

Linear regression, linear models, nonlinear regression

  1. \hat{SE}(coefficient) OR SE(\hat{coefficient})?

    Hi all, Typesetting a table at the moment and would like to know which is correct for the standard error, given the population model Y_t = a + b...

    Started by derksheng‎, 08-10-2012 09:08 AM
    • Replies: 6
    • Views: 2,581
    08-10-2012, 01:53 PM Go to last post
  2. [Violation] Hosmer & Lemeshow - Binary Logistics Regression

    I want to analyze some factors which contribute to smoking behavior in teenager and young adult. These are my variables: y = smoking status...

    Started by sg2kilo‎, 07-16-2012 09:14 AM
    hosmer and lemeshow
    • Replies: 5
    • Views: 2,620
    07-17-2012, 07:05 PM Go to last post
  3. Question [stata] interaction terms in conditional logit

    Dear all, There is a famous paper by Norton et al. (2003) which describes why stata's wrong about interaction terms in logit regressions. They...

    Started by Erold‎, 05-07-2014 09:08 AM
    buis, interaction term, logit, norton
    • Replies: 2
    • Views: 3,657
    05-08-2014, 04:23 AM Go to last post
  4. [Stata - Regression with categorical variables correlated] Multicollinearity

    Hello! I'm currently working on my thesis and I have a problem. I'm doing a regression where many variables are categorical ones (profession,...

    Started by cquetstr‎, 06-20-2014 06:16 AM
    categorical variables, regression, stata 11
    • Replies: 5
    • Views: 3,256
    06-21-2014, 08:25 AM Go to last post
  5. [SPSS] Multivariable logistic regression - how to transform to achieve linearity?

    Hi, I am doing a project to identify variables that can predict rehospitalisations. There are a few categorical and continuous variables that I...

    Started by Odd90‎, 07-20-2013 05:28 PM
    2 Pages
    1 2
    • Replies: 15
    • Views: 14,784
    08-12-2013, 07:05 PM Go to last post
  6. [SPSS - Logistic Regression] Resolve the linearity of logit assumption

    I am running a logistic regression and my income variable violates the linearity of the logit assumption. It is not negatively effecting the...

    Started by kdiallo11‎, 05-02-2015 03:37 PM
    linearity of logit, logistic regression, regression assumption
    • Replies: 3
    • Views: 4,707
    05-06-2015, 08:42 AM Go to last post
  7. [R]: ROC curve after fitting a logistic model to a new datset

    Hello, I have fitted a Logistic Regression model (with 1 binary DV, and several IVs), and then I fitted it to a new dataset using the function...

    Started by gianmarco‎, 01-22-2016 08:24 AM
    • Replies: 5
    • Views: 1,431
    01-23-2016, 06:45 AM Go to last post
  8. [R] Shapley values and relaimpo

    Hello everyone! Iíve been pondering this question for some time. Iíve searched online and on this forum and I havenít found the answer to my...

    Started by gheorghiu.alexandra‎, 02-01-2016 10:25 AM
    regression analysis, shapley value
    • Replies: 0
    • Views: 1,115
    02-01-2016, 10:25 AM Go to last post
  9. [R] How to calculate Confidence Interval for a prediction using Partial Regression?

    Dear all, I have two highly correlated variables (y and x), and both of them depend on a third variable (A, for Area). Multiple regression...

    Started by Dani DQ‎, 06-11-2012 06:15 PM
    • Replies: 0
    • Views: 1,690
    06-11-2012, 06:15 PM Go to last post
  10. [R] Difference between regression lines significant?

    Hi, I'm a PhD student researching processes of technology maturation. For this purpose I collected patent data which I want to use to...

    Started by Fiete‎, 06-10-2013 09:24 AM
    • Replies: 1
    • Views: 1,841
    06-11-2013, 11:35 PM Go to last post
  11. 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: 9,204
    03-02-2013, 09:23 PM Go to last post
  12. Smile [REGRESSION - REPEATED MEASURES] testing interactions with criterion scaling

    Hello everyone, I have a question about the criterion scaling method of analysing repeated-measures designs (Pedhazur, 1977). As far as I...

    Started by Lara333‎, 02-03-2012 11:11 AM
    • Replies: 0
    • Views: 1,837
    02-03-2012, 11:11 AM Go to last post
  13. [Probit] Can I be confident in my results even with a poor Goodness-of-Fit test?

    I am running a probit analysis on a data set with about 1000 cases, predicting probability of college graduation by a set of college institutional...

    Started by DavidBill‎, 02-18-2011 01:08 PM
    • Replies: 3
    • Views: 4,325
    02-18-2011, 03:27 PM Go to last post
  14. [Optimization Ė Solver] Good model fit, but wrong standard deviation coefficients

    Dear reader, I am facing an optimization problem and, at this point, I need help from someone with more knowledge than me. My goal: For a...

    Started by cgmac‎, 04-08-2013 04:54 PM
    excel, non-linear regression, optimization, solver, solvstat
    • Replies: 1
    • Views: 22,791
    04-08-2013, 04:59 PM Go to last post
  15. [ols] what is cov(xbar, bhat)?

    For a linear regression, y(i) = a + b x(i) + e(i), what is cov(xbar, bhat), ie, the covariance between the sample mean of x, xbar, and the ols...

    Started by :-)‎, 04-28-2014 07:51 AM
    covariance, ols, regression
    • Replies: 1
    • Views: 2,172
    04-28-2014, 08:34 AM Go to last post
  16. [newbie dumb question] Why is that the assumption of E(u)=0 essential for interences?

    If E(u)=0 is violated, how would it affect the inference of parameters, such as by using t-statistics? My understanding is that if E(u)=0 is...

    Started by elton.li‎, 02-09-2011 06:02 PM
    • Replies: 3
    • Views: 5,359
    02-10-2011, 12:27 AM Go to last post
  17. [Mplus] Decreasing iterations changes p value

    I'm doing longitudinal regression analysis using mplus, with cross-lagged models. In my analyses, I compare two models: one without constraints (H0),...

    Started by Delforterie‎, 05-20-2014 04:29 AM
    • Replies: 0
    • Views: 1,535
    05-20-2014, 04:29 AM Go to last post
  18. [Logistic Regression] - Is it possible to compare the outcomes?

    Dear all, First time poster here. I'm currently working on my thesis and i'm stuck with a complex matter which i hope you guys can help me with. I...

    Started by Tway‎, 11-19-2015 03:47 PM
    logistic regression
    • Replies: 1
    • Views: 1,427
    11-21-2015, 02:55 AM Go to last post
  19. [Logistic regression: Stepwise] Why does the model keep a non-significant predictor?

    Hello there, I'm running a logistic regression with four independent variables. I use the Stepwise: Backwards LR method for the regression. ...

    Started by MelinJD‎, 11-24-2015 11:01 AM
    • Replies: 2
    • Views: 1,416
    11-27-2015, 03:56 AM Go to last post
  20. Question [Logistic Analysis] How does SPSS calculate the 0.5 Cut-Point?

    I am interested in determining the classification accuracy of an outcome (binary DV - whether a participant has capacity or not to make a legal...

    Started by szuscak‎, 04-29-2016 05:25 PM
    cut-point, logistic regression
    • Replies: 0
    • Views: 1,120
    04-29-2016, 05:25 PM Go to last post
  21. [Log.reg.] Can I include confounder that does not have all categories of exposure?

    Hello. I am working on a thesis in public health science, and am stuck until this current problem i solved. Your help will be highly appreciated! ...

    Started by kristian‎, 03-21-2015 04:51 AM
    • Replies: 0
    • Views: 1,018
    03-21-2015, 04:51 AM Go to last post
  22. [Linear Regression] Regression with aggregated or separated years?

    Hello to everyone! :wave: I should do some regressions but i've an important and simple question... my dataset have this structure: ...

    Started by andre94‎, 08-25-2017 09:32 AM
    aggregation, linear regression, regression analysis
    • Replies: 4
    • Views: 325
    08-25-2017, 12:00 PM Go to last post
  23. [Linear Regression, Theory] Adequacy of Simpler Linear Regression model

    Hi Folks, That's my first post so bear with me. Also, apologies in advance for the basic question, but rummaging through Wikipedia, YouTube (which...

    Started by vn32427‎, 11-28-2013 05:33 PM
    linear regression;
    • Replies: 1
    • Views: 2,604
    12-01-2013, 12:18 AM Go to last post
  24. [Help -please!] Multiple Regression Model

    all done now

    Started by doomedromance‎, 06-05-2010 02:35 AM
    • Replies: 1
    • Views: 2,871
    06-05-2010, 04:55 PM Go to last post
  25. Question [Book suggestion] Analysis strategy

    So, I feel like what I've had in mind of statistics is sort of fragmented, but have trouble putting pieces together in a coherent and systematic...

    Started by non-sleeper‎, 11-01-2012 02:53 PM
    • Replies: 0
    • Views: 1,127
    11-01-2012, 02:53 PM Go to last post
  26. [age] discrete variable or continuous variable in linear regression?

    Hi i need some help. I hope you can guide me. I have a survey and i need to predict the variable e18. The issue is i'm not sure how to treat the...

    Started by jfca283‎, 04-24-2014 11:23 AM
    • Replies: 4
    • Views: 3,171
    04-24-2014, 12:51 PM Go to last post
  27. [ 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: 2,437
    11-05-2013, 08:25 AM Go to last post
  28. zero-inflated count data

    I want to do a regression where both the response and an explanatory variable are zero-inflated counts. It's fairly straightforward to do a ZIP...

    Started by erz‎, 07-11-2012 04:30 PM
    • Replies: 1
    • Views: 1,738
    07-11-2012, 05:35 PM Go to last post
  29. Zero-inflated continuous independent variables

    Are there ways of handling zero-inflated continuous independent variables?

    Started by doh_ramey‎, 11-01-2012 08:22 AM
    • Replies: 4
    • Views: 6,071
    11-01-2012, 10:44 AM Go to last post
  30. Zero values

    Hello, I need to do regression analysis and have price as an independent variable. The price is zero sometimes. How to handle this kind of data...

    Started by john_f‎, 05-01-2014 10:27 AM
    • Replies: 1
    • Views: 1,659
    05-06-2014, 02:58 AM Go to last post
  31. zero value of the regression parameter

    Hello. I would like to ask if anyone knows a website with the theme: regression testing parameter. I need only theory on the topic (to school). Just...

    Started by Dominik556‎, 04-25-2016 09:51 AM
    • Replies: 5
    • Views: 1,327
    04-25-2016, 09:33 PM Go to last post
  32. Zero inflated negative binomial regression interpreting main and interaction effects

    I am running a zero inflated negative binomial model (zinb) and want to interpret the main and interaction effects. I have the following: ...

    Started by random_android‎, 04-21-2017 03:51 PM
    interaction effects, main effect, negative binomial model, stata 14, zero inflated
    • Replies: 4
    • Views: 1,036
    04-22-2017, 02:43 AM Go to last post
  33. z-Transformation and interpretation

    My independent variables are mainly measured in percentages but also Euro and Age. Do I need to do a z-transformation? And how can I interprete...

    Started by Abigail‎, 11-28-2013 04:59 PM
    • Replies: 0
    • Views: 1,194
    11-28-2013, 04:59 PM Go to last post
  34. Z-test in NB regression model

    what is the null hypothesis of z-test in negative binomial regression?

    Started by najmehjami‎, 06-12-2011 04:55 PM
    • Replies: 4
    • Views: 3,498
    06-15-2011, 10:54 AM Go to last post
  35. Z-scores in Neg. Binomial Regression

    Hi I'm running a negative binomial regression model for some count data and did a Tukey's HSD range test to compare the different factors. When I...

    Started by nebulus‎, 07-18-2012 05:27 PM
    • Replies: 2
    • Views: 2,586
    07-23-2012, 02:25 AM Go to last post
  36. year fixed effects in time series regression

    I'm trying to estimate what effect the tariff rate in a specific country has on evasion of tariffs (or rather the underreporting of the value of...

    Started by oscarscheja‎, 08-26-2011 03:23 AM
    dummy variables, fixed effects, time series
    • Replies: 0
    • Views: 3,819
    08-26-2011, 03:23 AM Go to last post
  37. Year dummies in Fixed Effects estimation with panel data

    Quick question. I'm working with an unbalanced international dataset. I'm using fixed effects because (at least mostly because) I want to allow for...

    Started by ewalcott‎, 03-19-2013 08:40 AM
    dummy variables, fixed effects, panel data
    • Replies: 0
    • Views: 2,631
    03-19-2013, 08:40 AM Go to last post
  38. xtlogit coefficient interpretations

    I'm working on a project where I am using a logit model in the program Stata. I'm using the xtlogit command with panel data for city and years. My...

    Started by ohjosr‎, 03-17-2012 01:46 PM
    • Replies: 0
    • Views: 3,566
    03-17-2012, 01:46 PM Go to last post
  39. Writing R^2 strictly in terms of simple correlations among variables

    Say we have the following regression Y_i=\beta_0+\beta_1X_{1i}+\beta_2X_{2i}+\epsilon_i I want to write the multiple R^2 for this regression...

    Started by Jake‎, 10-17-2014 03:45 PM
    • Replies: 8
    • Views: 3,176
    02-07-2015, 07:06 PM Go to last post
  40. Writing down firth logistic regression equation

    Hi, This is a really simple question that I'm sort of embarrassed I can't answer - how would you write down a firth logistic regression? Now to...

    Started by Wendero‎, 04-25-2016 10:01 PM
    • Replies: 6
    • Views: 1,605
    04-27-2016, 12:59 PM Go to last post
  41. Would Seemingly Unrelated Regression apply here?

    I am trying to model changes in employee behavior along two different dimensions, y1 and y2, as a function of several explanatory variables, X (e.g.,...

    Started by mdv6‎, 11-13-2012 05:56 PM
    • Replies: 0
    • Views: 1,096
    11-13-2012, 05:56 PM Go to last post
  42. Worrying results of F/Wald test in panel data regressions - please help

    Hi All, I am running regression on panel data with 6 time periods and around 160 countries. I have been trying different combinations, but get...

    Started by SylviaS‎, 04-09-2012 07:40 AM
    • Replies: 1
    • Views: 1,925
    04-09-2012, 07:43 AM Go to last post
  43. working correlation matrix to use in generalized estimating equations

    I have a design with a between-subject variable (emotion) and within-subject variable (task type), and response data were binary (answer to a task:...

    Started by Yue‎, 04-15-2011 02:41 PM
    • Replies: 0
    • Views: 3,662
    04-15-2011, 02:41 PM Go to last post
  44. WLS Regression Weights

    I am working on a problem for which I need to do a multiple regression that involves a dependent variable and two independent variables. The...

    Started by elanmorin‎, 06-16-2012 02:08 PM
    • Replies: 0
    • Views: 3,339
    06-16-2012, 02:08 PM Go to last post
  45. WLS in application

    Dear stats experts I am aware that the following questions are maybe trivial but I never really got it. Consider I have data of one subject...

    Started by statsdonkey‎, 08-16-2012 06:35 PM
    • Replies: 1
    • Views: 1,336
    09-01-2012, 02:18 AM Go to last post
  46. Question WLS Confidence interval

    Guys can anyone assist? I've googled and read lots on the matter of WLS (mainly lecture notes from asorted university courses google finds)....

    Started by dj_johnphillips‎, 06-23-2015 10:31 AM
    • Replies: 3
    • Views: 2,700
    06-24-2015, 02:09 AM Go to last post
  47. With or without random effects, same interpretation?

    Hi, I did some observations about chickens in a free range area, which was divided in sections. The response variable is: 1 if there were chickens...

    Started by LukasVO‎, 05-23-2013 12:03 PM
    • Replies: 0
    • Views: 1,838
    05-23-2013, 12:03 PM Go to last post
  48. Winsorizing when I have different size groups

    I have a sample that consists of large, medium, and small firms and i want to run a separate regression for each size group. When I winsorize a...

    Started by 12345678‎, 02-03-2017 04:41 AM
    outliers
    • Replies: 0
    • Views: 1,931
    02-03-2017, 04:41 AM Go to last post
  49. winsorisation of a numerical scale from 1 to 23 assigned to the credit rating

    Dear Members, Iam preparing a regression model and my supervisor told me to winsorise all the variables. However, among the variables I have a...

    Started by granis89‎, 07-03-2014 05:59 PM
    credit rating, linear regression, outliers, winsorization
    • Replies: 0
    • Views: 883
    07-03-2014, 05:59 PM Go to last post
  50. Willingness To Pay is out of ranges of bids asked in survey

    Hello, I'm trying to estimate the willingness to pay (WTP) for whale watching by using a probit model (the results are similiar with a logit). But...

    Started by dmitre88‎, 08-23-2012 03:26 PM
    bid, logit, probit, whale watching, wtp
    • Replies: 2
    • Views: 2,172
    08-27-2012, 10:26 PM Go to last post
  51. Will Cochrane-Orcutt process remedy heteroskedasticity? Using GRETL

    I tried searching for this in the forums but cant seem to find anything. I'm probably just wording it wrong. I'm working on a research project for...

    Started by NorCalLove‎, 11-17-2015 12:19 AM
    • Replies: 1
    • Views: 1,198
    11-17-2015, 05:44 AM Go to last post
  52. Will a logarithmic transformation create curvilinearity?

    Hello All, Ok, I'm a bit stuck on this one. I ran a logarithmic transformation on my DV to overcome a serious skew and now I'm seeing quite a few...

    Started by Rob1983‎, 07-08-2014 08:01 AM
    • Replies: 2
    • Views: 1,638
    07-08-2014, 09:41 AM Go to last post
  53. Why X1 nor X2 is insignificant but together [X1, X2] are significant in a regression

    Hi, I run 2 similar linear regressions on election vote shares as the dependent variable : Regression 1 with X1 as the key explanatory...

    Started by wand‎, 02-24-2014 09:35 PM
    • Replies: 2
    • Views: 2,488
    02-25-2014, 02:03 PM Go to last post
  54. why the first two regressions are not enough and why the other two are

    we want to see if there is income convergence when trade liberalization takes place. we use two measures. . The fi rst is the standard deviation of...

    Started by eac13‎, 11-17-2013 05:19 AM
    • Replies: 0
    • Views: 1,043
    11-17-2013, 05:19 AM Go to last post
  55. Why is there perfect multicollinearity in this regression?

    Hi Everybody, I will simplify my problem to make this all more clear. Suppose I have three countries (1, 2 and 3) and I have data on migration...

    Started by Salohcin‎, 10-03-2012 03:58 PM
    • Replies: 4
    • Views: 2,857
    10-03-2012, 05:02 PM Go to last post
  56. Why is there endogeneity in this specification?

    See http://www.talkstats.com/showthread.php/26427-Critique-my-endogeneity-proof.

    Started by derksheng‎, 06-21-2012 06:01 AM
    • Replies: 1
    • Views: 1,618
    06-22-2012, 09:26 AM Go to last post
  57. 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: 8,701
    09-30-2011, 12:41 PM Go to last post
  58. Why doesn't the through the origin method work?

    I am doing a question on the regression between the number of pizzas and the delivery time. The lowest number of pizzas is 2. I am given the...

    Started by S-C-3-1-3‎, 01-24-2014 02:58 AM
    • Replies: 3
    • Views: 1,491
    01-24-2014, 01:20 PM Go to last post
  59. Why does the coefficient change sign when another variable is added to the OLS model?

    Dear all, I am trying to run an OLS regression in Stata 13, with log of per capita calorie as my dependent variable and age and years of education...

    Started by monzur‎, 12-19-2014 03:53 PM
    • Replies: 7
    • Views: 5,741
    12-19-2014, 04:27 PM Go to last post
  60. Why does efficiency matter

    In a discussion of my old favorite non-normal data, Fox notes that while CI and test of signficance are commonly not effected much by nonnormality in...

    Started by noetsi‎, 02-16-2012 02:01 PM
    • Replies: 5
    • Views: 1,746
    02-17-2012, 11:49 AM Go to last post

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