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Forum: Regression Analysis

Linear regression, linear models, nonlinear regression

  1. Poisson GLM with identity link function

    Hi, I'm trying to understand GLM, and was wondering why one should want to use an identity link function (for example with Poisson regression)....

    Started by Patrick‎, 08-26-2012 06:43 AM
    • Replies: 0
    • Views: 3,323
    08-26-2012, 06:43 AM Go to last post
  2. Statistical Analysis - Multiple Regression?

    Hi I am struggling through my 4th year thesis - so very stuck on the data set and the best way of testing my hypotheses. I apologise if my question...

    Started by PJLopey‎, 08-24-2012 09:13 PM
    • Replies: 5
    • Views: 1,829
    08-24-2012, 11:10 PM Go to last post
  3. GLM: Assumptions and choosing a model

    Hello all, I have a question that I would be interested in hearing other's opinions/feedback. I have monthly cost data from 2006 to 2011 (72...

    Started by lancearmstrong1313‎, 08-22-2012 07:30 AM
    2 Pages
    1 2
    • Replies: 16
    • Views: 6,515
    08-24-2012, 06:26 PM Go to last post
  4. Replication in logistic regression

    Hello. I'm planning a seed germination experiment where n total seeds are evenly distributed across i replicates of j treatments (so that n equals...

    Started by rolo‎, 08-20-2012 12:49 PM
    design, logit
    • Replies: 2
    • Views: 2,586
    08-23-2012, 01:52 PM Go to last post
  5. The claim of homoscedasticity when presenting an OLS specification

    From http://web.mit.edu/~kjforbes/www/Papers/AsianFluandRussianVirus-JIE.pdf applied econometrics paper: Why does the author claim...

    Started by derksheng‎, 08-22-2012 09:52 PM
    • Replies: 6
    • Views: 2,511
    08-22-2012, 10:12 PM Go to last post
  6. Probability of Breakdown

    I am considering using regression (either Cox or Logistic) analysis to estimate the probability of breakdown of vehicles in a fleet. I have some...

    Started by katlin‎, 08-22-2012 01:34 PM
    modeling
    • Replies: 2
    • Views: 2,615
    08-22-2012, 03:17 PM Go to last post
  7. Make predictions with standardized coefficients

    Hello, I've been struggling with a problem since a while, hopefully someone here could help me out. The problem: I want to use the...

    Started by Seko1987‎, 08-21-2012 02:21 PM
    coefficients, multiple regression, prediction, standardization
    • Replies: 4
    • Views: 3,286
    08-21-2012, 08:05 PM Go to last post
  8. Time Series ARIMA(p,d,q) - how to determine what p, d and q equal?

    Hello, I (think) understand that in order to determine the parameter values of an ARIMA(p,d,q) model, I need to look at three things: 1. PACF...

    Started by lancearmstrong1313‎, 08-17-2012 07:05 AM
    • Replies: 3
    • Views: 22,293
    08-21-2012, 07:32 AM Go to last post
  9. Dummy Variables

    Is there a limit to the number of independent variables that can be dummy coded for multiple regression as well as linear regression. In other words,...

    Started by stats2013‎, 08-19-2012 09:53 PM
    2 Pages
    1 2
    • Replies: 18
    • Views: 4,662
    08-20-2012, 05:15 PM Go to last post
  10. Should we remove non significant 1st order effects when interaction is significant

    My question is simple: When you have a multiple regression equation which is: Y = a0 + a1.X1 + a2.X2 + a12.X1X2 is it correct to remove...

    Started by lbarcelo‎, 12-03-2007 03:05 PM
    • Replies: 4
    • Views: 6,757
    08-20-2012, 10:02 AM Go to last post
  11. Using the sum of series as an explanatory variable

    In the table (attached) I am building regression models for each column series with the Overall Total column (last column, which is sum of each...

    Started by ouadad‎, 08-17-2012 04:19 PM
    • Replies: 3
    • Views: 2,030
    08-18-2012, 06:47 PM Go to last post
  12. too many samples on MANOVA

    Hello I am trying to build a MANOVA model, but my question can refer to a simple ANOVA or t-test. I have to compare 4 groups, and the data file...

    Started by Yankel‎, 08-18-2012 02:13 AM
    • Replies: 0
    • Views: 1,110
    08-18-2012, 02:13 AM Go to last post
  13. Probit Regression?

    So I was working on a Logistic Regression with binary DV, but now it turns out that the DV is actually probabilities such that they are between 0 and...

    Started by Autobot‎, 08-16-2012 09:24 AM
    2 Pages
    1 2
    • Replies: 19
    • Views: 2,998
    08-17-2012, 12:01 PM Go to last post
  14. Dependent variable issues: (i) Mild skewness and (i) Measurement error

    Cross-sectional \hat{Y}_i = a + b X_i + e_i over i \in \{1,2,...,300\}. \hat{Y}_i's were estimated in a different regression (specifically, 300...

    Started by derksheng‎, 08-16-2012 07:12 AM
    • Replies: 6
    • Views: 1,755
    08-17-2012, 10:08 AM Go to last post
  15. log transformations in difference in difference models

    I am running a difference in difference regression model in which I take the subtract values of x for my control group from those in my treatment...

    Started by sponge614‎, 08-16-2012 04:49 PM
    • Replies: 1
    • Views: 2,404
    08-16-2012, 08:48 PM Go to last post
  16. What does Durbin Wason for Time Series test for?

    Does the Durbin-Watson test for seasonality effect? If the p-value <.05 then there is reason to believe that some type of seasonality (whether it be...

    Started by lancearmstrong1313‎, 08-16-2012 09:47 AM
    • Replies: 5
    • Views: 2,771
    08-16-2012, 01:49 PM Go to last post
  17. R-Sq Relevance

    Hi, I have the following figures after creating a linear regression model using mintab: S = 2.65155 R-Sq = 31.8% R-Sq(adj) = 31.6% PRESS...

    Started by arkantosno1‎, 08-15-2012 04:36 AM
    • Replies: 3
    • Views: 3,078
    08-15-2012, 10:53 AM Go to last post
  18. No mediation, how can I formulate that?

    How should i forumulate that there is no mediation? what is the best formulation? Can you please give an example? thnx

    Started by veggie‎, 08-14-2012 08:03 PM
    • Replies: 1
    • Views: 1,566
    08-15-2012, 10:29 AM Go to last post
  19. Including student grade level in multilevel analysis

    Hello, I am analyzing school data and I have students from three grades (1st, 3rd, and 5th). I would like to see whether there are any differences...

    Started by Julie30‎, 08-14-2012 01:44 PM
    • Replies: 2
    • Views: 1,698
    08-14-2012, 02:19 PM Go to last post
  20. Question about predicted probabilities from a logit model

    So I have the following data and logistic regression mode = df=data.frame(income=c(5,5,3,3,6,5), won=c(0,0,1,1,1,0), ...

    Started by amathew‎, 08-13-2012 06:16 PM
    • Replies: 3
    • Views: 2,442
    08-14-2012, 01:00 PM Go to last post
  21. Seasonal Differencing

    I have a question about seasonal differencing. I understand that the seasonal difference is just the difference between a current value and the...

    Started by lancearmstrong1313‎, 08-14-2012 08:46 AM
    • Replies: 1
    • Views: 2,675
    08-14-2012, 09:21 AM Go to last post
  22. What is LAG (time series question)

    I have heard the term LAG used for time series and sort of have a very basic grasp of it. Could someone please try explaining it (in a very basic...

    Started by lancearmstrong1313‎, 08-13-2012 02:05 PM
    • Replies: 2
    • Views: 22,179
    08-14-2012, 07:50 AM Go to last post
  23. Regression help, please!

    Hi, I have a huge set of survey data looking at the relationship between service quality and satisfaction. I have around 30 independent variables...

    Started by x19mel‎, 08-13-2012 11:24 AM
    • Replies: 3
    • Views: 3,678
    08-14-2012, 04:39 AM Go to last post
  24. Interpreting odds ratios

    Deleted post

    Started by akiko_M‎, 08-13-2012 05:07 PM
    • Replies: 0
    • Views: 1,267
    08-13-2012, 05:07 PM Go to last post
  25. Granger Causality: Lag length selection.

    Consider simple G-Causality on two stationary time series vectors, each with 100+ observations. It's daily financial market time series data. I...

    Started by derksheng‎, 08-13-2012 02:46 AM
    • Replies: 0
    • Views: 2,325
    08-13-2012, 02:46 AM Go to last post
  26. Relationship between Pearson correlation and variance in regression model

    If the correlation between X and Y, say, is 0.5, then the standard deviation of the differences between the Y values and their predicted values on...

    Started by _joey‎, 08-12-2012 08:50 PM
    • Replies: 14
    • Views: 8,001
    08-12-2012, 11:33 PM Go to last post
  27. Simultaneous causality?

    I'm doing some applied econometrics and I'm a bit concerned about the model that I've been asked to estimate. Consider 3 stochastic time series...

    Started by derksheng‎, 08-11-2012 04:47 AM
    • Replies: 3
    • Views: 7,785
    08-11-2012, 10:14 AM Go to last post
  28. \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: 2,555
    08-10-2012, 01:53 PM Go to last post
  29. Help pls! :( OLS firm fixed effects model with time varying and invariant interaction

    Dear all, My paper proposal was just declined. Appearantly, I estimated the wrong model and have only 2 days to correct it. I ran ols...

    Started by lemza‎, 08-09-2012 10:13 AM
    • Replies: 0
    • Views: 1,511
    08-09-2012, 10:13 AM Go to last post
  30. hierarchical regression for controlling variables?

    For my dissertation, my supervisor told me to do a regression analysis and control for 2 variables. So should I report in my dissertation that I have...

    Started by veggie‎, 08-02-2012 03:24 PM
    2 Pages
    1 2
    • Replies: 15
    • Views: 12,297
    08-07-2012, 09:41 AM Go to last post
  31. Someone help me make sense of this regression analysis

    Hello, I was reading a paper "Sociable and Prosocial Dimensions of Social Competence in Chinese Children: Common and Unique Contributions to...

    Started by pjtaylor‎, 08-06-2012 09:26 AM
    interaction, moderation, mutliple regression, prospective
    • Replies: 1
    • Views: 1,736
    08-06-2012, 10:09 AM Go to last post
  32. What to do with very low Durbin-Watson?

    For 100 companies, I have collected (i) `tweets` and (ii) corporate website `pageviews` for `148` days. The tweetvolume and pageviews per day are two...

    Started by reveller‎, 08-06-2012 06:16 AM
    autocorellation, durbin-watson, residuals, spss
    • Replies: 0
    • Views: 3,528
    08-06-2012, 06:16 AM Go to last post
  33. Interpreting regression output

    Hi there, I have performed a linear regression of the energy consumption of an electric car on 7 measured parameters. They are 1. Max...

    Started by bradyj2‎, 08-06-2012 05:15 AM
    • Replies: 0
    • Views: 1,059
    08-06-2012, 05:15 AM Go to last post
  34. Confusing statement on heteroscedasticity 1986 paper

    From Sefcik & Thompson's (1986) "An approach to statistical inference in Cross-Sectional Models with Security Abnormal Returns as Dependent...

    Started by derksheng‎, 08-04-2012 06:18 AM
    • Replies: 2
    • Views: 1,312
    08-05-2012, 06:57 AM Go to last post
  35. Not Quite Quadratic Regression

    Hello all, I predict an u-shaped relation between two variables, y and x. If I perform a quadratic linear regression, i.e. use a model like ...

    Started by cause‎, 08-03-2012 09:00 PM
    fractional polynomials, non-linearity, polynomial regression, quadratic regression
    • Replies: 5
    • Views: 2,342
    08-04-2012, 07:46 AM Go to last post
  36. post test

    Dear all I run OLS regression and I have to test for Akaike info criterion, Schwarz criterion, Hannan-Quinn criterion, Durbin watsonstat, S.E OF...

    Started by momo‎, 08-03-2012 09:51 PM
    • Replies: 0
    • Views: 1,594
    08-03-2012, 09:51 PM Go to last post
  37. Best regression for linear data with nonlinear data in the top quartile?

    I am looking at the relationship between percentile ranking of asset management product performance and subsequent fund inflows/outflows (from...

    Started by gopherone‎, 08-01-2012 01:20 PM
    • Replies: 7
    • Views: 2,799
    08-03-2012, 09:17 AM Go to last post
  38. No mediation, how mentioning this in discussion?

    I performed the mediation hypothesis described by baron and kenny and eventough all 4 paths for mediation were significant and the standard...

    Started by veggie‎, 08-02-2012 03:18 PM
    • Replies: 2
    • Views: 2,046
    08-02-2012, 11:05 PM Go to last post
  39. Moderated multiple regression - comparing interactions with dummy variables

    Hello - I ran a moderated multiple regression in SPSS and am having a hard time understanding the results with my dummy codes. IV - rejection...

    Started by Susanmarkunas‎, 07-19-2012 02:29 PM
    • Replies: 6
    • Views: 2,985
    08-02-2012, 12:33 PM Go to last post
  40. What are the weaknesses of bootstrapping OLS standard errors?

    What are the weaknesses of bootstrapping OLS standard errors using residuals and pairs bootstrapping methodology? I've seen many sources on this...

    Started by derksheng‎, 08-01-2012 12:07 AM
    • Replies: 4
    • Views: 3,660
    08-02-2012, 10:46 AM Go to last post
  41. Error contribution from covariance in linear regression

    Hello, I try to consider the covariance in the error analysis of a linear regression with few data points. I could not find for this a worked...

    Started by Asterix‎, 07-24-2012 08:35 AM
    • Replies: 8
    • Views: 3,033
    08-02-2012, 08:07 AM Go to last post
  42. Goodness-of-fit for Poisson regression

    Hello, I have a couple questions that I'd love some help with. Thanks very much for your time! I'm running a Poisson regression to look at...

    Started by kirkby‎, 07-27-2012 12:14 PM
    • Replies: 1
    • Views: 4,716
    08-01-2012, 06:22 PM Go to last post
  43. Analyses of count data for seedling survival: poisson or logistic regression?

    Am I dealing with survival data (binary) or count data, and which is the best statistical analysis? I have counted seedlings surviving in each of...

    Started by ndafuda‎, 06-15-2012 04:38 AM
    • Replies: 8
    • Views: 3,875
    08-01-2012, 04:42 AM Go to last post
  44. Newbie Logistic regression/weighted regression

    Greetings I have been reading this article http://vassarstats.net/logreg1.html and trying to understand it but I am getting confused at how they...

    Started by aivoryuk‎, 07-26-2012 03:19 PM
    • Replies: 6
    • Views: 2,324
    07-31-2012, 05:03 PM Go to last post
  45. What does this mean?

    I ran a regression. One independent variable. One dependent variable. After I finished I got an r-squared of 0.85. Now suppose I do the following...

    Started by rummage‎, 07-30-2012 05:44 PM
    • Replies: 4
    • Views: 2,220
    07-31-2012, 03:03 PM Go to last post
  46. Compare regression coŽfficiŽnts in 2 models/ same sample, + 1 IV, SPSS

    Dear all, I am doing a master thesis in criminology and am trying to detect confounding effects of response styles on theoretical models....

    Started by Mathis‎, 07-22-2012 06:22 AM
    • Replies: 3
    • Views: 23,496
    07-30-2012, 02:45 PM Go to last post
  47. Investment risk vs. return

    Three investments in one of several groups of investments have finally given me a negative total return, so. . . for the last several years I put...

    Started by Outlier‎, 07-30-2012 12:20 PM
    • Replies: 0
    • Views: 1,397
    07-30-2012, 12:20 PM Go to last post
  48. Percentage variable [0,100) with a 30% of zeroes. Model type?

    Hi, which model would you suggest to model an independent varaible that: - It is is a percentage taking values in [0,100) - Around 30% of the...

    Started by TM957‎, 07-20-2012 04:51 AM
    • Replies: 2
    • Views: 2,136
    07-30-2012, 11:09 AM Go to last post
  49. Heckman selection model

    Dear All I am running a GMM panel data. The most important independent variable includes a huge number of zero observations (45%). How to...

    Started by momo‎, 07-29-2012 01:44 AM
    • Replies: 0
    • Views: 2,204
    07-29-2012, 01:44 AM Go to last post
  50. Controlling for age in multiple regression?

    Please bear with me, I'm hopeless at statistics and so very lost right now. I'm wanting to run a multiple regression with 9 IVs and 1 DV. I want...

    Started by kk89‎, 07-26-2012 05:07 AM
    • Replies: 1
    • Views: 2,202
    07-27-2012, 12:32 PM Go to last post
  51. dummy variables

    Hello everyone, Regarding my regression model i have several missing observations regarding one of my independent variable, in this case Research...

    Started by slacknoise‎, 07-27-2012 04:39 AM
    • Replies: 4
    • Views: 3,087
    07-27-2012, 06:49 AM Go to last post
  52. Regression in longitudinal survey data

    Hello, I have some longitudinal survey data which measures change in depression from time 1 to time 2. I want to analyse what factors, such as...

    Started by wb3gt‎, 07-26-2012 11:17 AM
    • Replies: 0
    • Views: 3,396
    07-26-2012, 11:17 AM Go to last post
  53. Thoughts on logistic regression dataset

    Hello! I'm running a logistic regression with 5 or so IVs predicting the outcome. The problem is that only around 300 cases out of about 1300 have...

    Started by drove5‎, 07-25-2012 03:38 PM
    • Replies: 2
    • Views: 2,147
    07-25-2012, 06:04 PM Go to last post
  54. Methodology design: "Which stocks fall first" & "Which stocks fall the most"

    Hi guys, I'm looking at an event study of 500 stocks. The event is a financial crisis, where I expect most stocks to fall over the window. I have...

    Started by derksheng‎, 07-25-2012 11:01 AM
    • Replies: 0
    • Views: 1,382
    07-25-2012, 11:01 AM Go to last post
  55. Finding complex relationships with multiple independent variables

    Howdy. Question - how can I find complex relationships when there are multiple independent variables. Specifically, I am looking at a situation where...

    Started by dwl‎, 07-25-2012 09:29 AM
    • Replies: 1
    • Views: 2,078
    07-25-2012, 10:45 AM Go to last post
  56. logistic regression, problems with missing values

    Hi all, I am new to logistic regression, so please forgive me if this question sounds stupid... I am doing an logistic regression on a Likert item...

    Started by moomin101‎, 07-25-2012 08:15 AM
    • Replies: 1
    • Views: 1,703
    07-25-2012, 09:12 AM Go to last post
  57. Testing arbitrary contrasts based on summary statistics

    Following the discussion in this recent thread (Getting F statistic from multiple t-statistics?) and spunky's request therein, here is a neat trick...

    Started by Jake‎, 07-24-2012 03:20 AM
    • Replies: 3
    • Views: 3,278
    07-24-2012, 07:55 PM Go to last post
  58. Poynomial Regression through the origin

    I am trying to program in SQL a polynomial regression of degree two with a zero intercept. I can't seem to find the appropriate literature on this...

    Started by coling‎, 07-24-2012 03:43 PM
    • Replies: 8
    • Views: 4,158
    07-24-2012, 05:50 PM Go to last post
  59. Holt-Winter forecasting for many future events

    Hello, I have been investigating and testing forecasting methods for incoming call volumes. I have many months of data. The data exhibits a...

    Started by youshouldneverthrowacat‎, 07-24-2012 10:25 AM
    forecasting, holt, triple exponential, winter
    • Replies: 0
    • Views: 2,354
    07-24-2012, 10:25 AM Go to last post
  60. Autocorrelation Remedy Help

    For my bachelor thesis I need to regress historical stock price with earning per share. My data consist of eleven years period with yearly...

    Started by ardinea‎, 07-21-2012 11:12 AM
    • Replies: 1
    • Views: 1,910
    07-24-2012, 07:30 AM Go to last post

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