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Forum: Regression Analysis

Linear regression, linear models, nonlinear regression

  1. 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: 1,664
    05-09-2011, 12:40 PM Go to last post
  2. 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: 3,758
    05-11-2011, 04:28 AM Go to last post
  3. 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: 2,565
    05-11-2011, 09:01 PM Go to last post
  4. 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: 2,334
    05-12-2011, 08:47 AM Go to last post
  5. 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: 6,235
    05-12-2011, 12:58 PM Go to last post
  6. 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: 1,695
    05-12-2011, 01:39 PM Go to last post
  7. 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: 2,410
    05-15-2011, 08:38 AM Go to last post
  8. 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: 2,350
    05-16-2011, 10:07 AM Go to last post
  9. 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: 2,631
    05-16-2011, 12:07 PM Go to last post
  10. 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: 1,643
    05-16-2011, 04:07 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: 1,852
    05-16-2011, 06:58 PM Go to last post
  12. 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: 3,029
    05-16-2011, 10:06 PM Go to last post
  13. 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: 2,312
    05-17-2011, 01:22 PM Go to last post
  14. 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: 1,294
    05-18-2011, 06:00 AM Go to last post
  15. 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: 2,708
    05-18-2011, 09:41 AM Go to last post
  16. 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: 2,968
    05-18-2011, 09:18 PM Go to last post
  17. 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: 2,435
    05-19-2011, 01:00 PM Go to last post
  18. 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: 3,023
    05-19-2011, 02:54 PM Go to last post
  19. 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: 1,968
    05-20-2011, 04:17 AM Go to last post
  20. 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: 2,300
    05-20-2011, 09:52 AM Go to last post
  21. 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: 2,930
    05-21-2011, 02:07 AM Go to last post
  22. Standard errors in IV and 2SLS

    Hi guys, I'm running an instrumental variable regression and the same two stage least squares regression in R. I get the same coefficient...

    Started by Ageo7836‎, 05-20-2011 11:31 PM
    • Replies: 1
    • Views: 3,598
    05-21-2011, 06:47 AM Go to last post
  23. Interaction term

    Hi, I'm running linear regressions (1) Y = a + b and (2) Y = a + b + axb The coefficients for a and b in (1) have positive signs which are...

    Started by dou‎, 05-22-2011 10:23 AM
    • Replies: 3
    • Views: 2,957
    05-23-2011, 04:49 AM Go to last post
  24. Large coefficient problem

    Hello, i'm running linear regressions for a large cross country panel data: the simplified term is similar to y = a + b + axb. When I run...

    Started by dou‎, 05-23-2011 04:21 AM
    • Replies: 3
    • Views: 3,005
    05-23-2011, 05:20 AM Go to last post
  25. Desperate to get a handle on regression

    I'm looking at predictors of helmet use amongst skiers. (200 subjects sent a questionnaire.) I have 5 or 6 categorical data columns such as...

    Started by txc876‎, 05-22-2011 10:22 AM
    • Replies: 2
    • Views: 1,737
    05-23-2011, 07:02 AM Go to last post
  26. Regression on a non-normal dependant variable

    Hi there, This situation is new to me: I have non-normal DV, for which no proper non-linear transformation (that I know of) exists. It is a score...

    Started by do999‎, 05-24-2011 11:26 AM
    • Replies: 2
    • Views: 3,674
    05-24-2011, 12:33 PM Go to last post
  27. Regression with incomplete data

    I have a potentially foolish question I'm hoping someone here can answer. I'm running a laboratory-based study and the primary analyses will be...

    Started by Ollie123‎, 05-24-2011 10:13 PM
    • Replies: 0
    • Views: 2,466
    05-24-2011, 10:13 PM Go to last post
  28. Is it normal to have negative constants?

    I was wondering whether we must include an intercept term in our equation? Also I have negative (some) significant constants. I know it means that...

    Started by dou‎, 05-23-2011 04:26 AM
    • Replies: 2
    • Views: 3,874
    05-25-2011, 12:20 AM Go to last post
  29. Comparing regression models for transformed and untransformed data

    I feel like I saw an answer to my question on here in the past, so I apologize if this is a repeat, but I have been unable to find the answer today...

    Started by PhDOH!‎, 03-27-2011 12:11 PM
    • Replies: 2
    • Views: 7,129
    05-25-2011, 12:36 AM Go to last post
  30. Post Multiple Linear Regression With Dummy

    Hi Friends, i m writing my M.Sc Thesis. During regression i got some problem, my problem is in dummy variable, some variables are in...

    Started by Economists‎, 05-25-2011 07:52 AM
    • Replies: 1
    • Views: 2,134
    05-25-2011, 12:09 PM Go to last post
  31. Question What does the correlation matrix for a multiple regression analysis contain?

    hi :wave: how do u doing? I have this quiz tomorrow and I need answer for one quistion If any one of u guys knew the answer u just type it ...

    Started by walol‎, 05-27-2011 06:59 AM
    • Replies: 1
    • Views: 5,945
    05-27-2011, 12:34 PM Go to last post
  32. crazy b and exp(b) in logistic

    Hi I'm running an interaction in logistic regression and when I do so my b and exp(b) for one of my main effect variables gets crazy. I know that...

    Started by dce219‎, 05-27-2011 11:40 AM
    • Replies: 4
    • Views: 2,677
    05-27-2011, 01:20 PM Go to last post
  33. Lightbulb Exclude Interaction Term and Include Fixed Effects instead

    Hey everybody. I know I shouldn't exclude the terms of an interaction variable in my regression; however, If I include both terms I have the...

    Started by 5forwards‎, 05-29-2011 08:57 AM
    • Replies: 0
    • Views: 2,587
    05-29-2011, 08:57 AM Go to last post
  34. Rescaling Variables

    hi guys, I'm trying to rescale variables so that I don't get such small coefficients. How should I go about this? Multiply independent by a...

    Started by Ageo7836‎, 05-26-2011 08:39 PM
    • Replies: 1
    • Views: 3,376
    05-29-2011, 07:01 PM Go to last post
  35. Regression Questions

    I am investigating the effect of cruise ship size on cruise ship occupancy rates. In addition, I am investigating the effect of cruise itinerary...

    Started by slee‎, 05-29-2011 10:31 AM
    • Replies: 2
    • Views: 2,391
    05-30-2011, 12:05 PM Go to last post
  36. Many DV's

    Hello, I need help, maybe someone can assist. My data consist signal that comes from a machine (a sensor of a machine). The engineers that...

    Started by NN_STAT‎, 05-29-2011 01:17 PM
    • Replies: 6
    • Views: 2,451
    05-31-2011, 03:13 AM Go to last post
  37. Multiple regression model validity question

    Regression Analysis: Return versus S, M, A, T The regression equation is Return = - 1.15 + 0.00507 S + 0.674 M - 0.141 A + 0.082 T ...

    Started by kaboom786‎, 06-01-2011 01:24 PM
    • Replies: 0
    • Views: 2,283
    06-01-2011, 01:24 PM Go to last post
  38. Weather Prediction

    I am looking at past temperature, solar angle, and wind vectors to develop a prediction of the temperature in the next hour. What would be the...

    Started by Aquabug222‎, 06-01-2011 01:29 PM
    • Replies: 0
    • Views: 1,533
    06-01-2011, 01:29 PM Go to last post
  39. How do i disprove a trend?

    Hi there, I have collected some data (points) over the last twenty years of 50,000+ people who have broken their hips. Their ages (mean and SDs)...

    Started by bonedoctor‎, 05-31-2011 06:35 PM
    • Replies: 6
    • Views: 2,854
    06-03-2011, 11:40 AM Go to last post
  40. Data Transformations in Multiple Regression

    I have a non-normal distribution for the residuals I'm testing for a multiple regression--what's the best course of action to take? If I transform...

    Started by Pachy‎, 06-03-2011 08:05 PM
    • Replies: 1
    • Views: 4,295
    06-03-2011, 09:07 PM Go to last post
  41. I(1)?deterministic trend? you could probably answer this!

    Hey all I am using the Augmented Dickey-Fuller test on EViews7 to test for stationarity in two series; ln(employment) and the ln(wage rate). Both...

    Started by Drareg‎, 06-04-2011 05:33 AM
    • Replies: 0
    • Views: 2,535
    06-04-2011, 05:33 AM Go to last post
  42. Applying SEM model to mutually exclusive smaller datasets

    Hello, I have an SEM model I am happy with and I am examining the standardized path coefficients. Then when I split the original data set into...

    Started by leylay‎, 06-03-2011 01:19 PM
    path coefficients, pathway model, sem, structural equation model
    • Replies: 2
    • Views: 2,190
    06-04-2011, 11:48 PM Go to last post
  43. Comparing time-based regressions

    Hello! I have a ton of temperature data over time for 38 different subjects (over 100,000 lines of data) that I ran regressions on for each...

    Started by wab‎, 06-05-2011 06:49 AM
    regression, time
    • Replies: 0
    • Views: 1,712
    06-05-2011, 06:49 AM Go to last post
  44. Which regression to choose ?

    Hello, I need some help fitting a linear regression model. I have one dependent variable, and 2 IV's. I need to find the best model, which is, a...

    Started by Yankel‎, 06-04-2011 01:55 AM
    • Replies: 11
    • Views: 4,849
    06-05-2011, 01:24 PM Go to last post
  45. Confidence Intervals for Estimates in Multinomial Logistic Regression

    Hello all, Is there a way to calculate a confidence interval for the estimates occurances of a dependent variable when using multinomial logistic...

    Started by PsychResearcherRASIS‎, 02-07-2011 11:09 AM
    • Replies: 8
    • Views: 8,790
    06-05-2011, 03:51 PM Go to last post
  46. Use of p-values for Cox proportional hazards model.

    I'm just reading what looks like quite a robust cohort study looking at patient survival after taking beta-blockers (a heart drug). The authors...

    Started by lovejonesuk‎, 06-05-2011 03:34 PM
    • Replies: 1
    • Views: 4,332
    06-05-2011, 04:37 PM Go to last post
  47. Question I need assistance with the interpretation of the attached regression

    Questions: I am trying to regress for price. Bal Prin= the unpain principle balance on the note CLTV=combined loan to value (1st +2nd...

    Started by Robert Moreno‎, 06-06-2011 01:33 PM
    • Replies: 0
    • Views: 1,891
    06-06-2011, 01:33 PM Go to last post
  48. Appropriate regression for dependent count data and independent "not count data"

    Hello, My independent data are continuous variables. My dependent variable is count data. I want to use regression to look for a relationship. ...

    Started by nofunsally‎, 06-06-2011 11:57 PM
    binomial, count data, poisson, regression
    • Replies: 2
    • Views: 4,107
    06-07-2011, 02:32 PM Go to last post
  49. Gauss Elimination

    Hi guys. Im being asked to program Gauss Elimination in R .Im new using this kind of program. It's simple but i don't know how to start. can someone...

    Started by DeMouraBR‎, 06-02-2011 09:45 AM
    • Replies: 13
    • Views: 7,989
    06-09-2011, 10:25 AM Go to last post
  50. Interdependence problem in time-series regression

    Hello I have a sample of 26 firms. I have computed transparency scores for these firms’ annual financial reports. The goal is to determine if...

    Started by atol‎, 06-10-2011 06:48 AM
    • Replies: 1
    • Views: 1,979
    06-10-2011, 10:56 AM Go to last post
  51. Comparing coefficients with different input dependent variables, but the same model.

    I have the following problem. I have the following model I use per sector (for example: Industrial, telecom, tech etc.): cccountry = a +...

    Started by alain1985‎, 06-10-2011 11:12 AM
    • Replies: 0
    • Views: 1,579
    06-10-2011, 11:12 AM Go to last post
  52. Prediction Region/Set from Multiple Logistic Regression

    Hello all, I'm not sure how easy or difficult the following question actually is but for all my efforts I haven't been able to find the answer, if...

    Started by chaps‎, 05-25-2011 04:24 AM
    • Replies: 9
    • Views: 4,843
    06-11-2011, 12:54 AM Go to last post
  53. SEM logic: beginner question

    Hello everybody, I have a question with regard to the basic logic of SEM: How is it plausible to expect that, for example, four indicators (a1,...

    Started by DataMonkey‎, 06-07-2011 03:47 PM
    • Replies: 2
    • Views: 2,416
    06-11-2011, 05:26 AM Go to last post
  54. Logstic Regression: What's this Graph Mean

    I'm learning logistic regression from reading and asking questions on my own. The following plot is from the predicted values of a logistic...

    Started by trinker‎, 06-10-2011 10:59 PM
    • Replies: 6
    • Views: 2,983
    06-11-2011, 09:01 AM Go to last post
  55. beta value- standardised regression coefficient

    Hi I was wondering if the t-test in a regression output can be used to state the significance of the Beta value and not just the unstandardised...

    Started by nicole‎, 06-12-2011 05:00 AM
    • Replies: 0
    • Views: 1,851
    06-12-2011, 05:00 AM Go to last post
  56. Question covariance and variance of BLUE

    Consider an RBD with 5 replications and 4 treatments t_1,t_2,t_3,t_4. We are given the following three treatment-contrasts: \frac{t_1-t_2}{2}...

    Started by Sambit‎, 06-10-2011 08:45 AM
    • Replies: 8
    • Views: 2,614
    06-12-2011, 11:13 AM Go to last post
  57. regression in repeated-measures design with questionnaires as predictors

    Hi everyone, I have 2X2 repeated measures design (congruent/incongruent and negative/neutral). I want to predict the main effects and the...

    Started by noga‎, 06-12-2011 02:54 PM
    questionnaire, repeated measures
    • Replies: 0
    • Views: 1,639
    06-12-2011, 02:54 PM Go to last post
  58. what method to use for modeling flue motality rate

    Here is the flu mortality graph from CDC. http://www.cdc.gov/flu/weekly/weeklyarchives2010-2011/images/picurve22.gif Mortality rate(red line) is...

    Started by aha123‎, 06-12-2011 08:42 PM
    • Replies: 1
    • Views: 2,561
    06-12-2011, 09:32 PM Go to last post
  59. Looking for Statistical explanation

    Hello, I deal now with multivariate regression, I have 2 IV's, called X1 and X2, and I have several Y's (DV's), and I try to fit a model to each...

    Started by NN_STAT‎, 06-13-2011 03:29 AM
    • Replies: 0
    • Views: 1,467
    06-13-2011, 03:29 AM Go to last post
  60. Comparing regression models with different predictor variables

    Hi I have done a multiple linear regression analysis on some measured acoustical parameters and have come up with tree equations that I wish to...

    Started by thelukewarm‎, 06-12-2011 04:42 AM
    • Replies: 1
    • Views: 2,583
    06-13-2011, 04:25 AM Go to last post

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