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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...

• Replies: 1
• Views: 1,664
05-09-2011, 12:40 PM
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...

• Replies: 0
• Views: 3,758
05-11-2011, 04:28 AM
3. ### 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...

• Replies: 3
• Views: 2,565
05-11-2011, 09:01 PM
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...

• Replies: 0
• Views: 2,334
05-12-2011, 08:47 AM
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...

• Replies: 3
• Views: 6,235
05-12-2011, 12:58 PM
6. ### 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...

• Replies: 0
• Views: 1,695
05-12-2011, 01:39 PM
7. ### 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...

• Replies: 1
• Views: 2,350
05-16-2011, 10:07 AM

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...

• Replies: 3
• Views: 2,631
05-16-2011, 12:07 PM
9. ### 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...

• Replies: 0
• Views: 1,643
05-16-2011, 04:07 PM
10. ### 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...

• Replies: 0
• Views: 1,852
05-16-2011, 06:58 PM
11. ### 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...

• Replies: 0
• Views: 3,029
05-16-2011, 10:06 PM
12. ### 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....

• Replies: 0
• Views: 2,312
05-17-2011, 01:22 PM
13. ### 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...

• Replies: 0
• Views: 1,294
05-18-2011, 06:00 AM
14. ### 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...

• Replies: 3
• Views: 2,968
05-18-2011, 09:18 PM
15. ### 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...

• Replies: 4
• Views: 2,435
05-19-2011, 01:00 PM
16. ### 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...

• Replies: 0
• Views: 1,968
05-20-2011, 04:17 AM
17. ### 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...

• Replies: 4
• Views: 2,930
05-21-2011, 02:07 AM
18. ### 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...

• Replies: 1
• Views: 3,598
05-21-2011, 06:47 AM
19. ### 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...

• Replies: 3
• Views: 2,957
dou
05-23-2011, 04:49 AM
20. ### 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...

• Replies: 3
• Views: 3,005
05-23-2011, 05:20 AM
21. ### 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...

• Replies: 2
• Views: 1,737
05-23-2011, 07:02 AM
22. ### 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...

• Replies: 2
• Views: 3,674
05-24-2011, 12:33 PM
23. ### 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...

• Replies: 0
• Views: 2,466
05-24-2011, 10:13 PM
24. ### 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...

• Replies: 2
• Views: 3,874
05-25-2011, 12:20 AM
25. ### 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...

• Replies: 2
• Views: 7,129
05-25-2011, 12:36 AM
26. ### 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...

• Replies: 1
• Views: 2,134
05-25-2011, 12:09 PM
27. ### 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 ...

• Replies: 1
• Views: 5,945
05-27-2011, 12:34 PM
28. ### 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...

• Replies: 0
• Views: 2,587
05-29-2011, 08:57 AM
29. ### 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...

• Replies: 1
• Views: 3,376
05-29-2011, 07:01 PM
30. ### 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...

• Replies: 2
• Views: 2,391
05-30-2011, 12:05 PM
31. ### 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...

• Replies: 6
• Views: 2,451
05-31-2011, 03:13 AM
32. ### 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 ...

• Replies: 0
• Views: 2,283
06-01-2011, 01:24 PM
33. ### 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...

• Replies: 0
• Views: 1,533
06-01-2011, 01:29 PM
34. ### 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...

• Replies: 1
• Views: 4,295
06-03-2011, 09:07 PM
35. ### 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...

• Replies: 0
• Views: 2,535
06-04-2011, 05:33 AM
36. ### 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...

• Replies: 2
• Views: 2,190
06-04-2011, 11:48 PM
37. ### 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...

• Replies: 0
• Views: 1,712
wab
06-05-2011, 06:49 AM
38. ### 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...

• Replies: 8
• Views: 8,790
06-05-2011, 03:51 PM
39. ### 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...

• Replies: 1
• Views: 4,332
BGM
06-05-2011, 04:37 PM
40. ### 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. ...

• Replies: 2
• Views: 4,107
06-07-2011, 02:32 PM
41. ### 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...

• Replies: 13
• Views: 7,989
06-09-2011, 10:25 AM
42. ### 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...

• Replies: 1
• Views: 1,979
06-10-2011, 10:56 AM
43. ### 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 +...

• Replies: 0
• Views: 1,579
06-10-2011, 11:12 AM
44. ### 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...

• Replies: 9
• Views: 4,843
06-11-2011, 12:54 AM
45. ### 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,...

• Replies: 2
• Views: 2,416
06-11-2011, 05:26 AM
46. ### 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...

• Replies: 0
• Views: 1,851
06-12-2011, 05:00 AM
47. ### 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}...

• Replies: 8
• Views: 2,614
06-12-2011, 11:13 AM
48. ### 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...

• Replies: 0
• Views: 1,639
06-12-2011, 02:54 PM
49. ### 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...

• Replies: 1
• Views: 2,561
06-12-2011, 09:32 PM
50. ### 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...

• Replies: 0
• Views: 1,467
06-13-2011, 03:29 AM

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