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Forum: Regression Analysis

Linear regression, linear models, nonlinear regression

  1. using partial regression to fix omitted variable bias?

    Hi Everybody, I am trying to find the effect of introducing a new variable. That is, I want to run two regressions: y = b0 + b1x1 and y...

    Started by salohcin85‎, 06-17-2013 03:35 PM
    • Replies: 0
    • Views: 1,373
    06-17-2013, 03:35 PM Go to last post
  2. Generalised least squares: from regression coefficients to correlation coefficients?

    Hi All, I asked this on Stack Exchange, but it seems no-one there knows the answer. I wonder if anyone on talkstats can shed some light on it. For...

    Started by sqrtsqrt‎, 06-17-2013 12:40 PM
    correlation, generalised least squares
    • Replies: 0
    • Views: 866
    06-17-2013, 12:40 PM Go to last post
  3. Regression help needed

    Hi All, Assuming Congo gets foreign aid from Denmark, Sweden, UK, US and Germany. How do I go about getting the effect of Denmark's aid on Congo....

    Started by royalstatus‎, 06-17-2013 10:48 AM
    • Replies: 1
    • Views: 1,377
    06-17-2013, 12:07 PM Go to last post
  4. Linear Discriminant Analysis - Sample size requirements

    As general question, Are 70 observations sufficient to design a reliable decision rule for discriminating between two groups, with a Fisher linear...

    Started by cgmac‎, 06-16-2013 07:29 AM
    discriminant analysis, lda, linear prediction, prediction model, sample size
    • Replies: 3
    • Views: 3,779
    06-16-2013, 12:49 PM Go to last post
  5. Nagelkerke and overall hit ratio won't improve in my logistic regression model!

    Hi! I have a problem doing my course assignment(with SPSS): I can't find a way to improve the overall hit ratio and Nagelkerke levels even...

    Started by Ivar‎, 06-13-2013 01:59 PM
    • Replies: 7
    • Views: 4,139
    06-14-2013, 03:31 PM Go to last post
  6. Question Analysing Panel Poisson Coefficients

    Hi, I'm running a panel poisson regression with fixed effects in Stata. The result in Stata doesn't display a constant. Normally I use standard...

    Started by Vinn‎, 06-14-2013 10:05 AM
    analysis help, coefficient, fixed effect, panel, poison regression
    • Replies: 0
    • Views: 1,572
    06-14-2013, 10:05 AM Go to last post
  7. Thumbs up How to get rid of market fluctuation? Should I?

    I am a finance student, but my real love is statistics... so I am trying to spend this summer working with little projects to learn as much as I...

    Started by kiki123‎, 06-14-2013 09:29 AM
    • Replies: 1
    • Views: 1,562
    06-14-2013, 10:01 AM Go to last post
  8. Cool Datasets for Multiple Linear Regression - How To get the Raw Data ?

    Hello everyone. kindly need ur help.. where can i get the raw data for multiple linear regression. the data should have : Atleast (5 variable)...

    Started by syafgy‎, 06-13-2013 05:32 PM
    multi linear regression
    • Replies: 2
    • Views: 4,098
    06-14-2013, 09:22 AM Go to last post
  9. What kind of regression analysis should I use?

    Dear All, I would like to conduct a regression analysis on a data set which includes dicrete inputs (Xs). The purpose is to have a regression...

    Started by togyika924‎, 06-12-2013 10:37 AM
    • Replies: 5
    • Views: 2,675
    06-14-2013, 01:49 AM Go to last post
  10. Unhappy Non linear mixed models

    HI Afer a lot of reading I am still confused what is the difference between a linear and non linear mixed model. I would really appreciate if some...

    Started by dev_fri‎, 06-13-2013 03:24 AM
    • Replies: 0
    • Views: 1,648
    06-13-2013, 03:24 AM Go to last post
  11. Grouping Categorical Variables in Regression differently in Main vs Interactions

    All, I have a very peculiar problem that I am trying to solve. What I mean is, the following is an explanation of the current solution that has...

    Started by FigNewtons1978‎, 06-13-2013 12:39 AM
    categorical variables, multiple regression
    • Replies: 0
    • Views: 1,267
    06-13-2013, 12:39 AM Go to last post
  12. Predict race outcome off expert predictions of outcome

    Hi, I'm new to this forum and found a late 2011 discussion of the relevance of regression analysis of rank outcome interesting. I have used...

    Started by MartyQ‎, 06-12-2013 01:06 PM
    • Replies: 4
    • Views: 1,833
    06-12-2013, 03:05 PM Go to last post
  13. what's regression curve?

    Dear all, I assessed the utility of the biomarkers to discriminate between two diseases states (infection or no infection) using ROC analysis. I...

    Started by xinhui‎, 06-12-2013 04:20 AM
    • Replies: 1
    • Views: 1,201
    06-12-2013, 08:14 AM Go to last post
  14. Question Linear multilevel models + 2LS - Help !

    Hi fellows, I really need some help : I have an exam on Saturday and I am not familiar at all with linear multilevel models and 2LS, although our...

    Started by schezar5‎, 06-12-2013 07:15 AM
    • Replies: 0
    • Views: 1,585
    06-12-2013, 07:15 AM Go to last post
  15. [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: 1,839
    06-11-2013, 11:35 PM Go to last post
  16. Linear Regression while comparing results?

    Hi all I am working on a research project for a basic stats course. I'm in the planning phase and could use some pointers to make sure I'm going...

    Started by Modal‎, 06-10-2013 06:09 PM
    distinctiveness, linear, regression, unique
    • Replies: 2
    • Views: 1,281
    06-11-2013, 10:57 PM Go to last post
  17. Polynomial regression question

    Say you have a linear and quadratic term. Is it possible for the linear term to be not signficant, and the quadratic term be signficant? If so, what...

    Started by noetsi‎, 06-05-2013 12:30 PM
    • Replies: 8
    • Views: 3,009
    06-11-2013, 11:17 AM Go to last post
  18. Logistic Regression

    Helo I am faced with a problem which looks to be a clear case of logistic regression. A dependent variable(binary in nature) needs to be...

    Started by Abhijeet30‎, 06-08-2013 11:20 AM
    • Replies: 4
    • Views: 2,206
    06-10-2013, 12:14 PM Go to last post
  19. Control Vairiables in Multiple regression

    Hi, I hope someone can help me. I need to run multiple regression with 2 IVs and 1 DV and include a control variables. The control variable is...

    Started by milehigh899‎, 06-06-2013 07:24 AM
    contol variables, regression
    • Replies: 12
    • Views: 2,493
    06-10-2013, 08:34 AM Go to last post
  20. OLS Regression

    Hi Guys, I am having some difficulties estimating a univariate equation. I was not able to write down the formula here, so i have uploaded it in...

    Started by mark.viduka‎, 06-09-2013 03:23 PM
    • Replies: 0
    • Views: 1,319
    06-09-2013, 03:23 PM Go to last post
  21. Analysing failure proportions

    Hi, Please can anyone help, I have this data attached - I need to find the average mileage at when the headlights fail ( headlight lifetime) ...

    Started by LizR‎, 06-09-2013 02:53 PM
    • Replies: 0
    • Views: 2,309
    06-09-2013, 02:53 PM Go to last post
  22. Predicting cutoff point of a peak

    I have a gaussian bell shaped chromatographic peak in which my 3 closely related impurities are getting separated (In the same peak). There is a...

    Started by gaj‎, 06-07-2013 10:40 AM
    • Replies: 2
    • Views: 1,426
    06-07-2013, 12:28 PM Go to last post
  23. Help with forecasting

    Hi. I have limited experience in statistics. I've tried to read up on textbooks and such but I suspect i'm missing something that someone more...

    Started by Sally72‎, 06-07-2013 04:30 AM
    • Replies: 0
    • Views: 1,381
    06-07-2013, 04:30 AM Go to last post
  24. Moderation Interaction and much more

    Dear all, first of all Im new here, just registered. However I read the rules and couldnt really find something which fits my problems since they...

    Started by Lewh‎, 06-06-2013 11:03 AM
    • Replies: 2
    • Views: 1,997
    06-06-2013, 12:36 PM Go to last post
  25. interpretation of logarithmic independent variable?

    Hi I have a dependent variable return on assets (%) and a independent variable which is ln(GNI/cap) thus a log transformed variable to the base...

    Started by julius‎, 06-06-2013 08:58 AM
    • Replies: 1
    • Views: 1,042
    06-06-2013, 09:15 AM Go to last post
  26. Not Significant Coefficients

    I've run a logit regression to estimate the probability of attending high school. I've done this for many years. The thing is that some coefficients...

    Started by chipi-arg‎, 05-23-2013 11:13 AM
    coefficient, logit, significance
    • Replies: 9
    • Views: 2,602
    06-05-2013, 11:29 AM Go to last post
  27. Binomial Logistic Regression - Predicted Probabilities

    Hi. I’m taking my first steps on binomial logistic regression and I was hoping you could help me with some doubts I’m having. My model has a...

    Started by FDFS‎, 05-27-2013 11:15 AM
    logistic
    • Replies: 9
    • Views: 2,165
    06-05-2013, 08:38 AM Go to last post
  28. Two Time Dummies?

    Hey all, I have a question about time dummies. I'm running a regression with country-years. For each country I have observations for the years...

    Started by sonja1000‎, 06-04-2013 08:17 AM
    • Replies: 3
    • Views: 1,961
    06-05-2013, 05:56 AM Go to last post
  29. help needed with two groups.

    i'm sorry if this is an incredibly stupid question, this is something i've never done before. i'm doing a study which involves asking two groups the...

    Started by appletoothpaste‎, 06-04-2013 08:15 PM
    • Replies: 1
    • Views: 1,031
    06-04-2013, 08:22 PM Go to last post
  30. Regression and Measurement Error

    Hi all, I stil have a problem with the regression regarding my thesis. For one variable, The relative net postions of speculators on the future...

    Started by Denniono‎, 06-03-2013 08:06 AM
    • Replies: 0
    • Views: 750
    06-03-2013, 08:06 AM Go to last post
  31. NonLinear Regression

    Hello all, I have a pretty general question: Which nonlinear regression is more reliable when you have a small sample of 50 - 70 size one...

    Started by triunk‎, 05-09-2013 08:24 AM
    • Replies: 6
    • Views: 1,589
    06-02-2013, 05:13 AM Go to last post
  32. Choosing between Binominal, Negative binominal and Poisson regression

    Hey guys, can some one explain to me in which situation it is best to use one of these three regressions? And what tests would I need to do in SPSS...

    Started by IvLi‎, 06-01-2013 02:53 PM
    • Replies: 1
    • Views: 1,338
    06-01-2013, 07:31 PM Go to last post
  33. Help with the cross-sectional regression and GMM

    Hi, Can someone please help me with this one? I'm trying to run the next multivariate regression: R_t = β_0 + B*F_t + β_L*L_t + e_t where...

    Started by thd‎, 06-01-2013 03:09 PM
    • Replies: 0
    • Views: 2,107
    06-01-2013, 03:09 PM Go to last post
  34. Comparing linear regressions - what method to use?

    I have a number of measurements of the initial reaction rate of x reactions. Assuming linearity until t = y gives me x linear regressions with...

    Started by ulrika‎, 05-27-2013 11:29 AM
    chemistry, comparing slopes, reaction rate
    • Replies: 5
    • Views: 1,818
    06-01-2013, 09:04 AM Go to last post
  35. Question Regression Analysis to increase operator safety

    Hi, First off, Ive never taken statistics (I have taken a few calculus classes in college, so some of the notation I am coming across is not too...

    Started by jblaven‎, 05-14-2013 09:13 AM
    • Replies: 3
    • Views: 1,389
    05-31-2013, 06:44 AM Go to last post
  36. system of two regressions with one endogenous regressor

    Hi Guys, i want to estimate the following model with 2 equations simultaneous, but im not quite sure if im on the right track r = a0 +...

    Started by wtf83‎, 05-30-2013 02:25 PM
    wtf
    • Replies: 0
    • Views: 1,344
    05-30-2013, 02:25 PM Go to last post
  37. Moderated Multiple Regression Analysis - but with repeated measures too?

    Dear stats experts, I have been struggling with a problem the whole day and only found a partial solution so far, which I think is not sufficient...

    Started by Geth85‎, 05-30-2013 12:24 PM
    • Replies: 2
    • Views: 3,980
    05-30-2013, 01:39 PM Go to last post
  38. Predicting the increase of one variable by the height of another variable

    Hi everybody, I have the following question: I have two continuous variables (assertiveness & team-identification). I have measured...

    Started by Geof‎, 05-30-2013 05:20 AM
    • Replies: 1
    • Views: 1,666
    05-30-2013, 12:07 PM Go to last post
  39. Calculation of effect size in Hierarchical regression

    Hello there, I have conducted a hierarchical regression with two steps. Statistical significance resulted form the first step, as the second...

    Started by YunaniQA‎, 05-29-2013 06:37 AM
    effect size
    • Replies: 3
    • Views: 4,199
    05-29-2013, 11:02 AM Go to last post
  40. Urgent: Help needed with ordinal data

    Hey all, So far I mostly worked with quantitative data, but now I have to do an analysis on effects alcohol consumption. Now I got a questionnaire...

    Started by allez‎, 05-26-2013 08:41 AM
    • Replies: 1
    • Views: 1,701
    05-29-2013, 09:44 AM Go to last post
  41. best regression for slaughterhouse variable?

    I'd like to know how several variables are related to the number of small-scale slaughterhouses at the county level throughout the US. There are...

    Started by jolesen‎, 05-28-2013 12:00 PM
    poisson regression
    • Replies: 3
    • Views: 1,319
    05-28-2013, 04:16 PM Go to last post
  42. Question AIC for models weighted

    Have to choose the best fit between different model. model.list <- list (model1 = nls (y ~ (a * exp (b * x)), data = dat, weights = n, start = list...

    Started by ksantos95‎, 05-28-2013 10:47 AM
    • Replies: 0
    • Views: 1,136
    05-28-2013, 10:47 AM Go to last post
  43. Help with dummy variable

    Hi, I have a set of OLS-fixed effects models comprising continuous and dummy variables, with the latter used as control parameters. My models aim...

    Started by anant.nanocorp‎, 05-26-2013 09:24 AM
    dummy variables, fixed effects, regression, stata
    • Replies: 1
    • Views: 2,207
    05-27-2013, 09:25 PM Go to last post
  44. Urgent help needed

    what sort of anaylsis should I use if I am trying to find the relationship between earthworm densities and soil properties (pH and organic matter...

    Started by peter704‎, 05-26-2013 10:46 PM
    • Replies: 1
    • Views: 1,571
    05-27-2013, 12:15 AM Go to last post
  45. Question Interpretation of Binary Logistic regression with confounder

    I simplified it a bit so I can get my question across easier Dep variable: Happy(0) or Sad(1) Independent variable: Age Independent V: Sent to...

    Started by Roymcfreely‎, 05-26-2013 02:25 AM
    logistic
    • Replies: 3
    • Views: 1,656
    05-26-2013, 05:59 PM Go to last post
  46. Interaction terms - lower level isn't significant!

    Hi there. I'm running a model with a 3 level interaction which is significant. I included all the two levels interactions which make the basis for...

    Started by PedroR‎, 05-26-2013 10:55 AM
    • Replies: 1
    • Views: 1,603
    05-26-2013, 11:48 AM Go to last post
  47. Red face Should I delete sampling zero points before adjusting a curve

    I need to fit a curve (regression and non-parametric smoothing) a set of points. These points represent the prevalence of disease by age. However, as...

    Started by ksantos95‎, 05-24-2013 04:26 PM
    • Replies: 0
    • Views: 965
    05-24-2013, 04:26 PM Go to last post
  48. PCR interaction of PCs

    Hi, I am using PCA to avoid multicollinearity problems and then I want to use the first 2 PCs in linear regression. The 1st PC contains 60% of...

    Started by szm‎, 05-24-2013 12:11 PM
    interaction, pca, pcr, regression
    • Replies: 3
    • Views: 1,168
    05-24-2013, 12:45 PM Go to last post
  49. Help on method selection

    Hi all, I wonder whether some of you have some valuable input on which method I should use in my research. The main idea is that I decompose a...

    Started by Starelite‎, 05-24-2013 03:08 AM
    measurement error, methodology
    • Replies: 0
    • Views: 1,307
    05-24-2013, 03:08 AM Go to last post
  50. Help understanding Microsoft Excel ANOVA output (Significance F ?)

    Hi, So I created my own very simple excel table, with a set of X and Y values, and then I told Excel to run a regression analysis. ...

    Started by spearchew‎, 05-22-2013 08:29 AM
    • Replies: 8
    • Views: 19,614
    05-23-2013, 12:43 PM Go to last post
  51. 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: 1,830
    05-23-2013, 12:03 PM Go to last post
  52. Question Asasociation between two series of measurements

    I have series of (metric) lab variables measured in a group of patients, with once daily measurements over 20 days, and I would like to investigate...

    Started by AVoelp‎, 05-22-2013 04:36 AM
    • Replies: 5
    • Views: 1,327
    05-23-2013, 06:04 AM Go to last post
  53. Multi-Factors model - Linear regression on Market Size

    Dear all, I'm working on a multi factors model analysis to come up with a formula to estimate market size of some countries based on several...

    Started by dudumomo‎, 05-20-2013 10:02 AM
    • Replies: 4
    • Views: 3,430
    05-22-2013, 12:46 PM Go to last post
  54. Path Model (SEM)

    Hello, Can anybody please explain how to interpret the "Path Model" results? In path models the structure is predefined (LV, MV and the Path),...

    Started by PKA111‎, 05-20-2013 03:26 PM
    • Replies: 3
    • Views: 1,896
    05-21-2013, 06:18 PM Go to last post
  55. Strange Wald Chi Square Value

    I ran a logistic regression model with 46 IV and 405 usable cases (and yes I know that is a lot of IV but for what I was doing it was required). In...

    Started by noetsi‎, 05-20-2013 12:49 PM
    • Replies: 4
    • Views: 1,723
    05-21-2013, 04:04 PM Go to last post
  56. RMA regression

    Hello! I'm trying to fit regression as a modeling approach between predictor variables (radiation, temperature, relative humidity, etc.) and...

    Started by ekullaj‎, 05-21-2013 03:18 PM
    rma or ols regression
    • Replies: 0
    • Views: 2,711
    05-21-2013, 03:18 PM Go to last post
  57. Moderation analysis problems

    Hi girls and guys :) I'm pretty stuck rigth now with my moderation analysis. First of all, this is for my bachelor thesis, psychology. I've...

    Started by ChristophR‎, 05-15-2013 10:53 AM
    • Replies: 3
    • Views: 3,617
    05-21-2013, 02:42 PM Go to last post
  58. Post Multiple linear regression

    Dear all, My question is, Why we use W, LR and LM tests instead of F tests to develop the preliminary test estimatior in a multiple linear...

    Started by Arumairajan‎, 05-21-2013 12:15 AM
    • Replies: 1
    • Views: 1,099
    05-21-2013, 02:40 PM Go to last post
  59. clustering similar lines (on chart)

    Firstly sorry if this is the wrong forum for this question. I have a matrix made up of distances in meters and for every distance I have an R2...

    Started by teshub‎, 05-20-2013 11:28 AM
    clustering, correlations, relationships
    • Replies: 0
    • Views: 1,131
    05-20-2013, 11:28 AM Go to last post
  60. Regression with 4 highly collinear IVs and 4 DVs, best approach?

    I have a dataset consisting of four continuous independent variables with a value between 0 and 1, and four continuous dependent variables with a...

    Started by ryūzaki‎, 05-18-2013 01:49 PM
    multivariate, regression
    • Replies: 1
    • Views: 1,484
    05-20-2013, 10:15 AM Go to last post

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