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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)....

• Replies: 0
• Views: 3,323
08-26-2012, 06:43 AM
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...

• Replies: 5
• Views: 1,829
08-24-2012, 11:10 PM
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...

• Replies: 16
• Views: 6,515
08-24-2012, 06:26 PM
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...

• Replies: 2
• Views: 2,586
08-23-2012, 01:52 PM
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...

• Replies: 6
• Views: 2,511
08-22-2012, 10:12 PM
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...

• Replies: 2
• Views: 2,615
08-22-2012, 03:17 PM
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...

• Replies: 4
• Views: 3,286
08-21-2012, 08:05 PM
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...

• Replies: 3
• Views: 22,293
08-21-2012, 07:32 AM
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,...

• Replies: 18
• Views: 4,662
08-20-2012, 05:15 PM
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...

• Replies: 4
• Views: 6,757
08-20-2012, 10:02 AM
11. 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...

• Replies: 0
• Views: 1,110
08-18-2012, 02:13 AM
12. 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...

• Replies: 19
• Views: 2,998
08-17-2012, 12:01 PM
13. 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...

• Replies: 6
• Views: 1,755
08-17-2012, 10:08 AM
14. 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...

• Replies: 1
• Views: 2,404
08-16-2012, 08:48 PM
15. 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...

• Replies: 5
• Views: 2,771
08-16-2012, 01:49 PM
16. 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...

• Replies: 3
• Views: 3,078
08-15-2012, 10:53 AM
17. 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

• Replies: 1
• Views: 1,566
08-15-2012, 10:29 AM
18. 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...

• Replies: 2
• Views: 1,698
08-14-2012, 02:19 PM
19. 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), ...

• Replies: 3
• Views: 2,442
08-14-2012, 01:00 PM
20. 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...

• Replies: 1
• Views: 2,675
08-14-2012, 09:21 AM
21. 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...

• Replies: 2
• Views: 22,179
08-14-2012, 07:50 AM

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

• Replies: 3
• Views: 3,678
08-14-2012, 04:39 AM
23. Interpreting odds ratios

Deleted post

• Replies: 0
• Views: 1,267
08-13-2012, 05:07 PM
24. 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...

• Replies: 0
• Views: 2,325
08-13-2012, 02:46 AM
25. 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...

• Replies: 14
• Views: 8,001
08-12-2012, 11:33 PM
26. 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...

• Replies: 3
• Views: 7,785
08-11-2012, 10:14 AM
27. \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...

• Replies: 6
• Views: 2,555
BGM
08-10-2012, 01:53 PM
28. 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...

• Replies: 0
• Views: 1,511
08-09-2012, 10:13 AM
29. 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...

• Replies: 15
• Views: 12,297
08-07-2012, 09:41 AM
30. 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...

• Replies: 1
• Views: 1,736
08-06-2012, 10:09 AM
31. 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...

• Replies: 0
• Views: 3,528
08-06-2012, 06:16 AM
32. 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...

• Replies: 0
• Views: 1,059
08-06-2012, 05:15 AM
33. 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...

• Replies: 2
• Views: 1,312
08-05-2012, 06:57 AM

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 ...

• Replies: 5
• Views: 2,342
08-04-2012, 07:46 AM
35. 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...

• Replies: 0
• Views: 1,594
08-03-2012, 09:51 PM
36. 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...

• Replies: 2
• Views: 2,046
08-02-2012, 11:05 PM
37. 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...

• Replies: 6
• Views: 2,985
08-02-2012, 12:33 PM
38. 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...

• Replies: 4
• Views: 3,660
08-02-2012, 10:46 AM
39. 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...

• Replies: 8
• Views: 3,033
08-02-2012, 08:07 AM
40. 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...

• Replies: 1
• Views: 4,716
08-01-2012, 06:22 PM
41. 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...

• Replies: 8
• Views: 3,875
08-01-2012, 04:42 AM
42. 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...

• Replies: 6
• Views: 2,324
07-31-2012, 05:03 PM
43. 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...

• Replies: 4
• Views: 2,220
07-31-2012, 03:03 PM
44. Compare regression coëfficiënts 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....

• Replies: 3
• Views: 23,496
07-30-2012, 02:45 PM
45. 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...

• Replies: 0
• Views: 1,397
07-30-2012, 12:20 PM
46. 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...

• Replies: 2
• Views: 2,136
07-30-2012, 11:09 AM
47. 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...

• Replies: 0
• Views: 2,204
07-29-2012, 01:44 AM
48. 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...

• Replies: 1
• Views: 2,202
07-27-2012, 12:32 PM
49. dummy variables

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

• Replies: 4
• Views: 3,087
07-27-2012, 06:49 AM
50. 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...

• Replies: 0
• Views: 3,396
07-26-2012, 11:17 AM
51. 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...

• Replies: 2
• Views: 2,147
07-25-2012, 06:04 PM
52. 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...

• Replies: 0
• Views: 1,382
07-25-2012, 11:01 AM
53. 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...

• Replies: 1
• Views: 2,078
07-25-2012, 10:45 AM
54. 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...

• Replies: 1
• Views: 1,703
07-25-2012, 09:12 AM
55. 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...

• Replies: 3
• Views: 3,278
07-24-2012, 07:55 PM
56. 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...

• Replies: 8
• Views: 4,158
07-24-2012, 05:50 PM
57. 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...

• Replies: 0
• Views: 2,354
07-24-2012, 10:25 AM
58. 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...

• Replies: 1
• Views: 1,910
07-24-2012, 07:30 AM

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