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Forum: Regression Analysis

Linear regression, linear models, nonlinear regression

  1. How to approach model selection

    Hi, This is my first formal attempt at a regression analysis that we hope to write up and submit. Basically we're wanting to investigate the effect...

    Started by pgseye‎, 05-20-2011 02:44 PM
    • Replies: 4
    • Views: 2,947
    05-21-2011, 02:07 AM Go to last post
  2. Help with choosing a model and identifying problems

    Hello, I have a complicated problem, I actually didn't start working on the data yet, still in the phase of planning. I need some help in getting...

    Started by NN_STAT‎, 05-12-2011 01:57 AM
    • Replies: 5
    • Views: 2,351
    05-20-2011, 09:52 AM Go to last post
  3. Precautions when using multiply imputed data in pooled OLS regression

    Dear all I am doing a straightforward pooled linear regression on a panel dataset (45 countries, 20 years) using OLS and relevant time dummies and...

    Started by PeterU‎, 05-20-2011 04:17 AM
    • Replies: 0
    • Views: 1,992
    05-20-2011, 04:17 AM Go to last post
  4. Question Straightforward question about how to select Generalized Linear Model

    Hi! I have what I think is quite a straightforward problem for those in the know. I have a dependent variable measured in different subjects....

    Started by amorphia78‎, 05-18-2011 03:12 PM
    • Replies: 7
    • Views: 3,063
    05-19-2011, 02:54 PM Go to last post
  5. Ratings of spotlights

    I'd like to maximize my candlepower per dollar for spotlights. The packaging may list one or two parameters of watts, lumens or candlepower and I'd...

    Started by Outlier‎, 05-18-2011 06:24 PM
    • Replies: 4
    • Views: 2,476
    05-19-2011, 01:00 PM Go to last post
  6. Generalised Least Squares VS Multilevel Modeling...

    hello guys! i've been trying to wrap my head around this question for a while... if i understand things correctly, generalised least squares (GLS) is...

    Started by will22‎, 05-17-2011 04:35 AM
    • Replies: 3
    • Views: 3,004
    05-18-2011, 09:18 PM Go to last post
  7. Interactions and Subgroup-Specific Effects

    Hello, I have a question regarding interaction terms in regression equations. For example, if I want to find out whether there is an interaction...

    Started by trafalgar‎, 05-17-2011 06:24 PM
    • Replies: 3
    • Views: 2,756
    05-18-2011, 09:41 AM Go to last post
  8. Help with Exam Question?

    Given, Y = alpha + betaX + error What is the danger of applying OLS to estimate and make inference on such a model…….describe how to test if...

    Started by washgomb‎, 05-18-2011 06:00 AM
    • Replies: 0
    • Views: 1,314
    05-18-2011, 06:00 AM Go to last post
  9. Event Study with illiquid stock prices

    Hello, I am trying to conduct an event study on 250 stocks. Not every stock is liquid and as a result occasionally the price is absent or zero....

    Started by gordo178‎, 05-17-2011 01:22 PM
    • Replies: 0
    • Views: 2,350
    05-17-2011, 01:22 PM Go to last post
  10. Bootstrapping regression coefficients - count DV

    Hi folks, I'm trying to plan some analyses for a project assessing how well some subscales measuring various facets of self-control (arguably...

    Started by CowboyBear‎, 05-16-2011 10:06 PM
    • Replies: 0
    • Views: 3,096
    05-16-2011, 10:06 PM Go to last post
  11. Anomoly detection using regression

    Hi There, X1 X2 and X3 are three observations made on a system. All three variables are the response of the system and it is seen theoretically...

    Started by hnandan‎, 05-16-2011 06:58 PM
    • Replies: 0
    • Views: 1,902
    05-16-2011, 06:58 PM Go to last post
  12. Nonlinear models vs nonlinear parameters

    The book G.A.F Seber "Linear Regression Analysis" (Wiley, 1977) says after the formula (3.3) that the model Yi = b0 + b1*exp(-b2*Xi)+ei is...

    Started by nagornyi‎, 05-16-2011 04:07 PM
    • Replies: 0
    • Views: 1,658
    05-16-2011, 04:07 PM Go to last post
  13. Building my 1st model please help!!

    Hi there, First of all please excuse my lack of knowledge of the subject I have just started a course in Econometrics and find using the...

    Started by Drareg‎, 05-07-2011 09:49 AM
    building regression model
    • Replies: 3
    • Views: 2,700
    05-16-2011, 12:07 PM Go to last post
  14. Standardized Linear Regression Help

    Hello, I'm a bit confused about what exactly plays the most important role in understanding correlations- the r or the probability? And which is...

    Started by ksenxx‎, 05-16-2011 05:11 AM
    • Replies: 1
    • Views: 2,388
    05-16-2011, 10:07 AM Go to last post
  15. Question about a strange type of variable in Cox regression table

    I have a question about this Cox regression analyse table; If you take a look at the valuation of variables in this table, you will see that...

    Started by Thijs‎, 05-14-2011 03:44 PM
    • Replies: 2
    • Views: 2,447
    05-15-2011, 08:38 AM Go to last post
  16. Exclamation Logistic regression model returns lower than expected logit

    Hi all, I'm using a logistic regression model with 3 variables to separate true positives from errors in a data set. All in all it seems to...

    Started by d_chall‎, 05-12-2011 01:39 PM
    logistic regression, logit, regression, regression analysis
    • Replies: 0
    • Views: 1,727
    05-12-2011, 01:39 PM Go to last post
  17. Help Regarding Linear Regression in SPSS (R Square help)

    Hi, this is my situation for a Human Resources research project. I have 100 respondents and 14 questions. All the questions are simple tick...

    Started by vipinkr3‎, 05-09-2011 05:15 AM
    • Replies: 3
    • Views: 6,298
    05-12-2011, 12:58 PM Go to last post
  18. Industry-Year regressions - excluding observations - need advice

    Hello, I am trying to run firm-year specific regressions in SAS to get to an expected value for industry-year. However, I need to exclude the i'th...

    Started by bcommerf‎, 05-12-2011 08:47 AM
    regression, regression analysis, sas
    • Replies: 0
    • Views: 2,360
    05-12-2011, 08:47 AM Go to last post
  19. Exclamation What type of regression?

    I am trying to determine if there is a relationship between two variables and how strong it is... Each patient has: number of comorbidities and...

    Started by matthewgrayson‎, 05-10-2011 06:55 PM
    • Replies: 3
    • Views: 2,607
    05-11-2011, 09:01 PM Go to last post
  20. assumption of linearity in the logit and transformation of continuous IV

    Hello, I am doing logistic regression in spss for my phd research. Testing the assumption of the linearity in the logit I included in the analysis...

    Started by Catherina‎, 05-11-2011 04:28 AM
    • Replies: 0
    • Views: 3,799
    05-11-2011, 04:28 AM Go to last post
  21. how to get an error estimate from a regression equation

    I am working with regression equations that were generated from biological data, plugging in values of x to get y. In addition to the y values, I...

    Started by l3a9k‎, 05-09-2011 12:04 PM
    • Replies: 1
    • Views: 1,690
    05-09-2011, 12:40 PM Go to last post
  22. Regression Analysis w/Dummy Variable

    I am trying to run a regression on a dataset. The dataset has the regions listed as 1, 2, 3, and 4. To run a regression, do i need to recode these...

    Started by oxygen‎, 05-07-2011 08:46 AM
    dummy variable, effect, regression, relationship
    • Replies: 2
    • Views: 3,057
    05-09-2011, 10:49 AM Go to last post
  23. Question regarding dummy variable and parameter equation.

    Hi, I am doing assignment and it requires me to develop a conceptual model and parameter equivalent to show my understanding in data analysis. So,...

    Started by musmus86‎, 05-08-2011 07:45 AM
    • Replies: 0
    • Views: 2,008
    05-08-2011, 07:45 AM Go to last post
  24. Data for regression analysis

    I am helping a friend with a project involving regression analysis. First off he wants to know if there is a way to determine if the extracted data...

    Started by c2q‎, 05-06-2011 06:43 PM
    • Replies: 4
    • Views: 2,403
    05-07-2011, 11:53 AM Go to last post
  25. Demonstrate that dependent variable is correlated with random error term

    The hint - show that if e rises, dependent variable Y also rises. C=a+bY+e Y=C+I C - consumption function Y - GDP I - investment e...

    Started by E574‎, 05-06-2011 05:47 PM
    • Replies: 0
    • Views: 2,669
    05-06-2011, 05:47 PM Go to last post
  26. Help with regression SpSS

    I am currently working on my master's thesis on Drunk Driving. Unfortunately my chair is very unhelpful and we have had lack of training using SPSS...

    Started by natas‎, 05-06-2011 02:18 PM
    • Replies: 0
    • Views: 1,781
    05-06-2011, 02:18 PM Go to last post
  27. Some help with exam preparation please

    Hi everyone! I'm studying for a stats exam and I am stuck on a few questions. Any help would be appreciated. Here are the coefficients and S.E.s...

    Started by Diane86‎, 05-04-2011 05:10 AM
    • Replies: 3
    • Views: 1,950
    05-06-2011, 12:55 PM Go to last post
  28. Special case of independent variable

    Hi guys, I have a question on how to deal with a specific independent variable in a logistic regression model. The independent variable is a...

    Started by eylan‎, 05-06-2011 02:31 AM
    • Replies: 0
    • Views: 1,716
    05-06-2011, 02:31 AM Go to last post
  29. Did I just fudge this categorical data transformation too much?

    I have a public data set gathered from 336 hospitals, with about 28,000 rows. I want to see if there is relationship between a particular input...

    Started by greg.neyman‎, 05-02-2011 04:33 PM
    categorical data analysis, dummy variables
    • Replies: 7
    • Views: 3,754
    05-05-2011, 05:05 PM Go to last post
  30. Calculating confidence bands for nonlinear regression

    Hi, I am trying to find a way to calculate the 95% confidence bands for nonlinear regression. I have found the following text on the web, but I do...

    Started by Dolphin72‎, 05-05-2011 11:53 AM
    confidence bands, nonlinear, regression
    • Replies: 0
    • Views: 2,847
    05-05-2011, 11:53 AM Go to last post
  31. Post Multiple regression - Best predictor

    Hello there! I am studying for a final exam next week and I'm not sure about this. How do we determine the "best predictor" in multiple...

    Started by johncuny‎, 05-03-2011 05:49 PM
    • Replies: 2
    • Views: 7,651
    05-04-2011, 08:23 AM Go to last post
  32. HELP PLEASE--Issue with Logistic Regression significance tests

    Hi, I have my independent work paper due on Tuesday, and I'm trying to test for the significance of specific variables for separate years 2003-11,...

    Started by TarHeel3007‎, 05-01-2011 01:27 AM
    • Replies: 1
    • Views: 2,863
    05-03-2011, 08:04 AM Go to last post
  33. Stationarity of Seasonal Box-Jenkins Model

    We've been working on group projects where we were given a set a of seasonal data, and from it create a Box-Jenkins model. In class, we were that...

    Started by downthesun01‎, 05-03-2011 02:50 AM
    • Replies: 0
    • Views: 2,249
    05-03-2011, 02:50 AM Go to last post
  34. Regularized Canonical Correlation Analysis

    Hi, I have a question about sample size and regularized canonical correlation analysis. Is a sample size of 15 unreasonable to use in a regularized...

    Started by cupcake‎, 05-01-2011 08:05 PM
    canonical correlation, data analysis, regularized, sample size
    • Replies: 0
    • Views: 2,053
    05-01-2011, 08:05 PM Go to last post
  35. Calculate the MSE of s-squared

    Consider the multiple regression model y=Xb+u where u~N(0,sigma-squared times identity) where b is a Kx1 vector, X is a non-stochastic full rank...

    Started by eBopBob‎, 05-01-2011 06:35 AM
    • Replies: 0
    • Views: 3,143
    05-01-2011, 06:35 AM Go to last post
  36. Lightbulb Multiple Linear Regression w/ Categorical Predictor Variables (Linearity Assumption?)

    Hi, How do we test the linearity assumption for categorical predictor variables such as gender? What kind of a transformation do I need to use?

    Started by surveystat‎, 05-01-2011 04:04 AM
    • Replies: 0
    • Views: 3,194
    05-01-2011, 04:04 AM Go to last post
  37. Help with interpretation of Wald, chow, t-tests

    Sorry about the double post - it is in the elementary forum as well. But I should have put it here to begin with. Thanks in advance. I hope you...

    Started by nerdboy2317‎, 04-30-2011 01:16 AM
    • Replies: 1
    • Views: 7,008
    04-30-2011, 05:30 PM Go to last post
  38. Panel data, two measurment, what methods? Fixed effect models?

    In need of assistance! I have two datasets, one from 1998 and one from 2006 that have been merged using ID-numbers. In 1998 I measure if the...

    Started by inspire‎, 04-30-2011 04:24 PM
    • Replies: 0
    • Views: 1,504
    04-30-2011, 04:24 PM Go to last post
  39. Confidence interval for coefficient of regression

    Hi, I dont understand how we can find the CI when we dont know what is n ? My question says. c) Assume that Se^2 =12.84 and V(β)= Se^2/(sumX^1)...

    Started by SadieKhan‎, 04-30-2011 02:19 PM
    • Replies: 2
    • Views: 2,911
    04-30-2011, 02:32 PM Go to last post
  40. Statistical significance in linear vs logistic regression

    Hey all, I'm running a multiple linear regression with a continuous Y variable and five continuous X variables (including a continuous-continuous...

    Started by constantly‎, 04-30-2011 12:59 PM
    • Replies: 0
    • Views: 1,981
    04-30-2011, 12:59 PM Go to last post
  41. Logistic Regression- Multicollinearity?

    Hi, I would really appreciate some guidance- I am running logistic regression equations with indepedent variables in SPSS, however there is a lot of...

    Started by pochi04‎, 04-29-2011 10:39 PM
    • Replies: 2
    • Views: 2,862
    04-30-2011, 12:31 PM Go to last post
  42. Multiple regression

    Hi, I have five factors for sixteen variables. I want to develop a regression expression for a dependent variable using the correlated variables....

    Started by tassi‎, 04-28-2011 11:43 AM
    • Replies: 1
    • Views: 1,832
    04-30-2011, 01:43 AM Go to last post
  43. Talking House Price Regression - Need opinion and suggestion.

    Hi everyone, This is my very first time running regression(am very excited :D) and any opinion and suggestion will be very welcome !! I have...

    Started by Dude888‎, 04-12-2011 11:34 AM
    • Replies: 1
    • Views: 2,843
    04-30-2011, 01:06 AM Go to last post
  44. Impossible exam question!

    I just got done taking an exam by an evil and cruel professor who likes to throw in problems that he's never discussed in class, never assigned for...

    Started by danjohnson10‎, 04-27-2011 08:11 PM
    • Replies: 8
    • Views: 4,503
    04-29-2011, 11:00 PM Go to last post
  45. the t-values for regression coefficients

    How can I calculate the t-values of the regression coeffs if I have the sample size and the correlation matrix only? Is this possible? Thanks in...

    Started by liamplayt‎, 04-27-2011 11:04 PM
    regresion, t-test
    • Replies: 2
    • Views: 2,407
    04-29-2011, 09:13 AM Go to last post
  46. inverse transformation and reflection

    Hi all, I'm doing a multiple regression analysis and my outcome variable is strongly positively skewed. Without transformation skewness = 2.10...

    Started by abuschgens‎, 04-29-2011 05:18 AM
    • Replies: 0
    • Views: 2,850
    04-29-2011, 05:18 AM Go to last post
  47. Question Is this the right way to do things?

    So I have been trying to do a time-series regression to attempt to discover causality between a bunch of variables. I had 4 variables with around 25...

    Started by Royalty‎, 04-27-2011 11:41 AM
    • Replies: 1
    • Views: 1,607
    04-27-2011, 03:44 PM Go to last post
  48. Assumptions for adding indicator variable

    Hi, can you please tell me the assumptions that are needed to be satisfied before adding indicator variables? I have searched on internet but I...

    Started by SadieKhan‎, 04-27-2011 12:25 PM
    • Replies: 2
    • Views: 3,165
    04-27-2011, 03:07 PM Go to last post
  49. Find expected value and variance of ARMA(1,1) model

    My apologies if this isn't the correct subforum to ask this question. Here's the model: y_{t}=50+ 0.8y_{t-1} + a_{t} - 0.2a_{t-1} How do I...

    Started by downthesun01‎, 04-25-2011 06:13 PM
    • Replies: 3
    • Views: 13,275
    04-27-2011, 02:11 AM Go to last post
  50. collinearity - incorrect sign?

    I read from a book that the collinearity (or multicollinearity) could possibly lead the signs of the regression coefficients to being incorrect....

    Started by liamplayt‎, 04-25-2011 10:01 PM
    collinearity, regression
    • Replies: 4
    • Views: 3,263
    04-26-2011, 02:43 AM Go to last post
  51. testing regressions

    Hi, I have a very simple question: when I run a regression what are the things that I should test for to make sure that my regression is solid....

    Started by 12345678‎, 04-23-2011 11:38 AM
    • Replies: 1
    • Views: 2,242
    04-25-2011, 10:14 AM Go to last post
  52. Subadditivity?

    I am being asked whether certain interactions in a multiple logistic regression model with are subadditive or not. I was told to use a graph to...

    Started by Adam J.R. Tallman‎, 04-24-2011 10:23 PM
    • Replies: 1
    • Views: 1,837
    04-24-2011, 10:24 PM Go to last post
  53. Interpreting the coefficient in a NegBin regression

    Hi, I am doing a regression on immigration in Denmark. My dependent variable is a count variable with the number of immigrants between two regions...

    Started by Jeppe‎, 04-23-2011 04:20 PM
    • Replies: 1
    • Views: 12,622
    04-24-2011, 07:33 PM Go to last post
  54. Partial regression plots in R

    Hey guys, I'm slowly converting myself from an SPSS user to an R user. I'm running a pretty basic multiple regression model and want to produce...

    Started by pinkfreud‎, 04-24-2011 11:15 AM
    multiple, partial, plots, regression
    • Replies: 1
    • Views: 23,848
    04-24-2011, 01:39 PM Go to last post
  55. Thumbs up Dealing with missing data?!

    Hi guys, I was wondering if anyone can help me figure out what to do, I am pretty bad at statistics but needs must and all that! :p Basically...

    Started by Royalty‎, 04-23-2011 11:03 AM
    • Replies: 7
    • Views: 6,615
    04-24-2011, 12:51 PM Go to last post
  56. Instrumental variables

    I am doing monte carlo simulations and comparing OLS with instrumental variables estimates, however while most of my betas seem consistent when IV is...

    Started by thedreamshaper‎, 04-24-2011 09:02 AM
    • Replies: 1
    • Views: 1,971
    04-24-2011, 10:54 AM Go to last post
  57. Phonetics: Interactions without one of the main effects

    I am using a logistic regression model with bias reduction in order to predict the contrast between /b/ and /p/ in Ojibwe based on acoustic...

    Started by Adam J.R. Tallman‎, 04-22-2011 09:11 PM
    aic discriminant, interaction effect
    • Replies: 5
    • Views: 3,648
    04-23-2011, 03:32 PM Go to last post
  58. Estimated Variance of R squared

    I'm looking to compare two R squareds using a formula derived from a article called Correlation Redux by Olkin & Finn. This technique doesn't appear...

    Started by trinker‎, 04-21-2011 07:35 PM
    • Replies: 4
    • Views: 7,460
    04-23-2011, 11:50 AM Go to last post
  59. Test Review HELP!!

    this is a example for my test review and i dont know how to do b,c,d,e parts of it can someone tell me how to do it/the answer so i can better...

    Started by patshea098‎, 04-23-2011 08:14 AM
    • Replies: 1
    • Views: 3,469
    04-23-2011, 11:18 AM Go to last post
  60. Correlation and Multiple Regression

    Can you please help me understand the following questions - 1. Looking at correlations and scatterplots how can we determine if multiple regression...

    Started by raamaak‎, 04-23-2011 03:32 AM
    • Replies: 0
    • Views: 1,715
    04-23-2011, 03:32 AM Go to last post

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