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# Forum: Regression Analysis

Linear regression, linear models, nonlinear regression

1. ### Mean Squared Prediction Error?

Hi, I am having trouble understanding how to use MSPE. Let's say I have 30 data points and then a sample of 4 of them is selected (the 'test...

• Replies: 0
• Views: 3,703
04-12-2011, 10:50 AM
2. ### Discrete regression

What is the/an appropriate regression technique to use where the dependent variables are discrete labels. For example, I have predicted survival...

• Replies: 0
• Views: 2,403
04-12-2011, 11:59 AM
3. ### Factor in binary logistic regression?

Hi, I am currently performing a binary logistic regression, with a number of predictors. The aim is to measure the relationship between the...

• Replies: 1
• Views: 3,251
04-13-2011, 02:47 AM
4. ### Johansen Cointegration test issue

Hello, Let me describe the issue: I have a vector of four time series, each component of which is I(1). When I put the four series into a matrix...

• Replies: 0
• Views: 2,262
04-14-2011, 05:00 PM
5. ### Time series or just repeated measures?

Hi All, I have data on 7 clusters (ie, sites). The date are monthly counts (there is no zero inflation in most of the outcomes of interest...most...

• Replies: 0
• Views: 2,966
04-14-2011, 09:14 PM
6. ### proof:variance

Hi, I want to find the variance of coeffiicient b(beta) in a regression without constant term(no intercept).I am not ]with variance algebra. I...

• Replies: 2
• Views: 4,855
04-15-2011, 09:27 AM
7. ### working correlation matrix to use in generalized estimating equations

I have a design with a between-subject variable (emotion) and within-subject variable (task type), and response data were binary (answer to a task:...

• Replies: 0
• Views: 3,623
Yue
04-15-2011, 02:41 PM
8. ### Logit Equation - fitting the quadratic

Hi, I posted a question in the main stats forum, but basically, I wondered if anyone knows the formula to fit the quadratic to the logit equation?...

• Replies: 1
• Views: 3,105
04-16-2011, 11:48 PM
9. ### regression with categorical predictor

Hi people, i have a problem which i could not solve myself, maybe somebody can help me. i have three groups (A/A, A/B and B/B) and a continuous...

• Replies: 1
• Views: 3,269
04-17-2011, 12:02 AM
10. ### Moderated Multiple Liner Regression

Hey, I'm doing some research on the sensitivity of executive compensation (DP) to a set of economic determinants (IV). The main part of my...

• Replies: 1
• Views: 2,464
04-17-2011, 12:20 AM
11. ### Regression with latent variable

Hi, I'm doing some research for my dissertation and need to construct a latent variable that includes observations of various economic...

• Replies: 3
• Views: 6,980
04-17-2011, 01:11 PM
12. ### Interaction Between Quadratic Variables in Logistic Regression

Hi, I got some questions about assumption and interpretation of conditional logistic regression. It seems that two of my variables (let says N and...

• Replies: 0
• Views: 3,360
STG
04-18-2011, 07:42 AM
13. ### complex survey analysis and weight variables in proc surveylogistic

I am analyzing the effect of Calcium on Obesity in adults based on the NHANES dataset. I have two questions. First, since I am combining two day...

• Replies: 1
• Views: 4,145
04-18-2011, 11:05 AM
14. ### Multiple regression test of significance using r squared

I have a multiple regression with 5 independent variables, and obtained the r^2. Then I removed two IVs, and get the R^2 for the reduced model with...

• Replies: 4
• Views: 9,737
04-19-2011, 05:06 PM
15. ### Error Propagation in Multivariable Regression

I've spent all day reading Matlab tutorials and can't seem to find anything about propagating error in regression analysis. I have a set of x and y...

• Replies: 0
• Views: 2,956
04-20-2011, 05:41 PM
16. ### Easy Questions: Simple regression

Hi, I have three questions for you on which I have issues: Should I use correlation test or simple regression: that "ratio data" is...

• Replies: 3
• Views: 2,806
04-21-2011, 03:51 PM
17. ### Multiple Regression: Help to prove SD Beta 3 minus Beta 4

Hi I've been having a lot of trouble with this problem. How do I show that; SD_Beta3 - Beta4 = √(Var(Beta_3)+Var(Beta_4)-2Cov(Beta_3, Beta_4))...

• Replies: 4
• Views: 2,754
04-21-2011, 05:57 PM
18. ### Linear mixed model without random or repeated effects? GLMZ?

Hi, I'm working on a dissertation, of which many chapters have longitudinal data and I've been using linear mixed models to estimate growth. I...

• Replies: 1
• Views: 3,082
04-22-2011, 10:18 AM
19. ### Logistic Regression Probability

Hi Guys, I'm working on a simple logistic regression problem. I'm wanting to find the exact value of x(independent variable) that gives a 0.5...

• Replies: 4
• Views: 2,557
04-22-2011, 02:47 PM
20. ### Choosing the Best Regression Model

I have been asked to build a predictive model of a population based on cost. The sample size of the population is 30k for the current test (with data...

• Replies: 0
• Views: 3,663
JAH
04-22-2011, 03:48 PM
21. ### 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...

• Replies: 0
• Views: 1,704
04-23-2011, 03:32 AM
22. ### 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...

• Replies: 1
• Views: 3,436
04-23-2011, 11:18 AM
23. ### 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...

• Replies: 5
• Views: 3,627
04-23-2011, 03:32 PM
24. ### 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...

• Replies: 1
• Views: 1,953
04-24-2011, 10:54 AM
25. ### 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...

• Replies: 7
• Views: 6,549
04-24-2011, 12:51 PM
26. ### 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...

• Replies: 1
• Views: 23,691
04-24-2011, 01:39 PM
27. ### 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...

• Replies: 1
• Views: 12,504
04-24-2011, 07:33 PM

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...

• Replies: 1
• Views: 1,819
04-24-2011, 10:24 PM
29. ### 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....

• Replies: 1
• Views: 2,228
04-25-2011, 10:14 AM
30. ### 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....

• Replies: 4
• Views: 3,210
04-26-2011, 02:43 AM
31. ### 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...

• Replies: 3
• Views: 13,196
04-27-2011, 02:11 AM
32. ### 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...

• Replies: 2
• Views: 3,130
04-27-2011, 03:07 PM
33. ### 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...

• Replies: 1
• Views: 1,578
04-27-2011, 03:44 PM
34. ### 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...

• Replies: 0
• Views: 2,835
04-29-2011, 05:18 AM
35. ### 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...

• Replies: 2
• Views: 2,393
04-29-2011, 09:13 AM
36. ### 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...

• Replies: 8
• Views: 4,480
04-29-2011, 11:00 PM
37. ### 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...

• Replies: 1
• Views: 2,822
04-30-2011, 01:06 AM
38. ### 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....

• Replies: 1
• Views: 1,827
04-30-2011, 01:43 AM
39. ### 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...

• Replies: 2
• Views: 2,855
04-30-2011, 12:31 PM
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...

• Replies: 0
• Views: 1,969
04-30-2011, 12:59 PM
41. ### 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)...

• Replies: 2
• Views: 2,904
04-30-2011, 02:32 PM
42. ### 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...

• Replies: 0
• Views: 1,488
04-30-2011, 04:24 PM
43. ### 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...

• Replies: 1
• Views: 6,963
04-30-2011, 05:30 PM
44. ### 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?

• Replies: 0
• Views: 3,184
05-01-2011, 04:04 AM
45. ### 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...

• Replies: 0
• Views: 3,115
05-01-2011, 06:35 AM
46. ### 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...

• Replies: 0
• Views: 2,046
05-01-2011, 08:05 PM
47. ### 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...

• Replies: 0
• Views: 2,241
05-03-2011, 02:50 AM
48. ### 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...

• Replies: 2
• Views: 7,601
05-04-2011, 08:23 AM
49. ### 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...

• Replies: 0
• Views: 2,806
05-05-2011, 11:53 AM
50. ### 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...

• Replies: 7
• Views: 3,746
05-05-2011, 05:05 PM
51. ### 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...

• Replies: 0
• Views: 1,712
05-06-2011, 02:31 AM
52. ### 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...

• Replies: 3
• Views: 1,932
05-06-2011, 12:55 PM
53. ### 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...

• Replies: 0
• Views: 1,769
05-06-2011, 02:18 PM
54. ### 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...

• Replies: 4
• Views: 2,381
c2q
05-07-2011, 11:53 AM
55. ### 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,...

• Replies: 0
• Views: 1,984
05-08-2011, 07:45 AM
56. ### 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...

• Replies: 2
• Views: 3,037
05-09-2011, 10:49 AM

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