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# Forum: Regression Analysis

Linear regression, linear models, nonlinear regression

1. ### Nonlinear regression using the Gauss-Newton algorithm in C

Hey guys, I'm being asked to program this up in C. If any of you know of any good references for the Gauss-Newton algorithm, please post them for...

• Replies: 7
• Views: 10,875
12-17-2010, 10:56 AM
2. ### Simple question about least square regression line?

A study on the effect of bus fare (X) on the number of passengers (Y) produced the following result. Bus fare (\$) 2.5 3.0 3.5 4.0 4.5 5.0 5.5 6.0...

• Replies: 1
• Views: 2,730
BGM
12-15-2010, 01:11 PM
3. ### How do you calculate B1 from a regression formula?

I have this question, which essentially asks me to find B1, I know the answer is -2.28 but can't work out how to get it! Thanks in advance everyone....

• Replies: 0
• Views: 9,647
12-15-2010, 09:01 AM
4. ### Diagnostics in regression: A visual example

The follwing R-code/picture shows a simple linear regression with no outliers and 3 different kind of outliers. It also plots the diagnostic values,...

• Replies: 0
• Views: 3,179
12-13-2010, 07:01 AM
5. ### Analysis of Data over time?

Hi! I am investigating animal social networks and I have long term data set spanning 15 years. I have looked at each animals 'network position'...

• Replies: 0
• Views: 3,205
12-13-2010, 06:31 AM
6. ### Statistic question in a simple marketing implementation?

Hello, I know this question can be too simple for this forum, but Im new here and was not sure where to post. I'm trying to build model for a...

• Replies: 0
• Views: 2,134
12-12-2010, 11:23 AM
7. ### Segmented Regression Sample Size

Hello, I am using Segmented Regression (SegReg*) to compare proportional occurrence (Y) of 18 species vs. proportional habitat cover (X) to...

• Replies: 0
• Views: 4,206
12-11-2010, 06:45 PM
8. ### Regression in excel - Is this possible?

Hi guys. Okay for my regression project, I have all my data and my Y value is based on 7 variables (i.e. Y = b0 +b1x1 +...+ b7x7) Now i have...

• Replies: 5
• Views: 4,349
12-11-2010, 01:59 PM
9. ### Linear Mixed Effects Regression

Hello, Please can anyone help me with the above topic. I'm using SAS and am unsure on how to program this. I think that a PROC MIXED is to be...

• Replies: 5
• Views: 7,031
12-10-2010, 07:14 AM
10. ### Need urgent help

Hi, I have two variables, and simple regression analysis shows that these two variables are insignificant when I add 3 more variables along with the...

• Replies: 2
• Views: 2,847
12-10-2010, 04:23 AM
11. ### Growth Rates

I have a huge panel data set consisting of thousands of firms for a time period of 8 years. I would like to transform some of my variables. For...

• Replies: 2
• Views: 3,574
12-09-2010, 05:39 AM
12. ### Regression using gram-schmidt orthogonalization

Hello dear members, Hoping again to solicit some help from the knowledgeable members here, I thought I'd come to you with this question. I'm...

• Replies: 7
• Views: 5,928
12-07-2010, 11:31 PM
13. ### Linear Regression Model with one variable and no constant

Hi, I've been given a problem sheet and I'd like some help as to start answering the questions, Given the model; Yi=β1Xi + ui a) show that this...

• Replies: 1
• Views: 4,867
12-07-2010, 10:15 PM
14. ### analyzing residual plot by hand

Hi! Thanks in advance for looking at my query. I have a very basic question regarding regression. We have to analyze a residual Plot by hand. We...

• Replies: 1
• Views: 7,857
12-06-2010, 07:54 PM
15. ### Multiple Regression and SEM

This is largely a theory question. I have been unhappy with my professor's attempt to answer this question for me so I want to get others' opinions....

• Replies: 2
• Views: 6,377
12-05-2010, 08:11 PM
16. ### How to estimate change effects through time using R?

Hi I am using project R and I have two sets of datas: 1. House prices, house info (eg. sqft, rooms, lot sizes, etc), area codes, and school...

• Replies: 1
• Views: 3,237
12-05-2010, 06:45 PM
17. ### Polynomial regression help

Hello, I am working in retailing here in Europe, and we are trying to support evidence that sales are positively correlated with space allocated,...

• Replies: 1
• Views: 3,793
12-05-2010, 04:02 PM
18. ### How to conduct a repeated measures regression with ordinal outcome variable?

Hi, I am trying to predict an ordinal variable (success: 0, 1, 2, 3). I have 3 predictor variables I want to include in the analyses together with...

• Replies: 0
• Views: 4,172
12-04-2010, 04:03 PM
19. ### insignificant variables- what to do?

Hello, I'm running a few regressions for an econometrics paper and have a question: should insignificant independent variables be omitted from...

• Replies: 2
• Views: 10,557
12-04-2010, 01:23 AM
20. ### Survey Results & Regression Analysis..Dummy Variable?

Hello All. I have just received results back from a survey that I launched and I need help on how to analyze the results. There may be some need...

• Replies: 1
• Views: 4,733
12-04-2010, 01:08 AM
21. ### Step by Step by Step help please?

Hello all, can anyone help me understand this step by step understanding of linear regression and correlation?

• Replies: 6
• Views: 3,965
12-03-2010, 04:14 AM
22. ### Multiple linear regression + QQplots problem! Includes Pics!

Hello I want to do multiple linear regression, but one of the requirements is the residuals to be normally distributed, and I can check that with...

• Replies: 3
• Views: 3,048
11-30-2010, 12:34 PM
23. ### Interpretation of MANOVA

Hello everyone, Forgive me for my ignorance, but I have a quick basic question. When conducting a MANOVA (Using JMP) the output gives me values...

• Replies: 1
• Views: 4,307
11-29-2010, 01:55 PM
24. ### Develop regression model while given "average" data

I'm stuck on the following question and would like some guidance please: From a study, the average heights of Grade 5, Grade 6 and Grade 7 boys...

• Replies: 2
• Views: 2,892
11-28-2010, 06:32 PM
25. ### Plz suggest good textbook for statistics in regression analysis

Hie. Can anyone please post a good text book or a reference guide for the Multi regression analysis which can explain all the statistics behind the...

• Replies: 0
• Views: 4,027
11-27-2010, 02:13 PM
26. ### Multinomial 2 dv's?

Hi All. I'm happy to be part of the Talk. Question: Is is possible to do a multinomial logistic regression if you only have 2 categories of...

• Replies: 1
• Views: 2,616
11-26-2010, 08:44 AM
27. ### Rmse

Ok so now I have developed calibration regression models for predicting the levels of 2 Fatty acid isomers 1 and 2. The isomer 1 is present in high...

• Replies: 0
• Views: 2,873
11-24-2010, 06:07 PM

Hello, I have a strong history in modelling chemical data and other scientific data. I have a data set that I'm working with and I want to take...

• Replies: 0
• Views: 2,430
11-24-2010, 09:37 AM
29. ### Comparing coefficients for nested logistic regressions

Hi, maybe one out there can help. I am interested in comparing the coefficients of two binary logistic models. In one nested in the other one,...

• Replies: 9
• Views: 4,440
11-24-2010, 08:45 AM
30. ### Excel's t stat question.

Hi guys, I'm a little confused over this right now. I performed a regression in excel and as an example, this is what i got for my first...

• Replies: 3
• Views: 5,122
11-23-2010, 06:49 PM
31. ### choosing the right model

Hello, Does it makes sense to test H_knot : Beta1 = 0 after having rejected H_knot : Beta2 = 0. So in other words, if it appears that a 2nd...

• Replies: 4
• Views: 2,773
11-23-2010, 12:03 PM
32. ### Instrumental variable analysis

Dear people, In my simple regression analysis are two variables endogenous. GPAi = α + β•Wi +β•Wi^2 + θ•Si + θ•Si^2 + Qi•φ + εi Where Wi and Si...

• Replies: 0
• Views: 4,797
11-23-2010, 07:55 AM
33. ### centered polynomials

in a model involving Y= B0 + B1X1 + B2X2^2, how does centering the model affect the parameters. why does the hypothesis test associated with B2...

• Replies: 1
• Views: 4,180
11-23-2010, 01:01 AM
34. ### Regression Estimated variance and Chi-square distribution

Hi all * If i have a data set and I model it using linear regression I estimate intercept, slope and variance Ymodel=a+bx and the...

• Replies: 0
• Views: 4,309
11-21-2010, 04:48 AM
35. ### Interaction term

Hi! On a general basis I'm wondering if it is ok (meaningful) to exclude a covariat from a regression model when an interaction is included. ...

• Replies: 0
• Views: 2,850
11-20-2010, 12:43 PM
36. ### Weighty issue...

Hi I have a conceptual issue with some data I am analysing. I am looking at the point prevalence of a particular disease as reported in medical...

• Replies: 0
• Views: 2,381
11-19-2010, 04:59 AM
37. ### MANOVA vs multiple ANOVAs

Hello everyone, For starters, I just found this site and am wondering where it has been all my life, or all my PhD, they feel like the same thing...

• Replies: 1
• Views: 6,845
11-18-2010, 11:24 PM
38. ### Multinomial Logit vs Dummies vs Ordinal Logit

Hello everybody, I need help with the following: I would like to conduct a survey, where my dependent variable would be a discrete, nominal...

• Replies: 0
• Views: 4,275
11-18-2010, 03:22 PM
39. ### suppressor variables

I have built a multiple linear regression model with two independent variables (say X1 and X2). The primary aim is *not* to use the model for...

• Replies: 0
• Views: 2,393
11-17-2010, 05:58 AM
40. ### Mixed model variance estimates

Hello, With the mixed model y_ij = mu + alpha_i + epsilon_ij where alpha_i a random effect with distribution assumed normal and epsilon_ij is...

• Replies: 0
• Views: 2,554
11-15-2010, 11:15 PM
41. ### Non-Existent Beta Matrix

Help please: Consider only a simple linear regression model for this please. so, Y(vector) = X matrix * Beta matrix + Error(vector) under...

• Replies: 1
• Views: 2,479
11-15-2010, 12:13 PM
42. ### Kruskal-Wallis equality-of-populations rank test

Dear Colleagues I am using KW test to check the differences between Four different types of companies and I use four variables, so I check for...

• Replies: 0
• Views: 5,407
11-12-2010, 09:27 AM
43. ### Estimation method for ratio dependent variable?

Hi, Logistic regression is used if the dependent variable is a discrete choice variable. My dependent variable is not a discrete choice variable,...

• Replies: 4
• Views: 11,513
11-12-2010, 05:30 AM
44. ### quick question

Can someone tell me the difference between Model I and Model II regression? I have some data that I'd like to plot in JMP but I'm not sure which...

• Replies: 0
• Views: 2,895
11-09-2010, 04:43 AM
45. ### Help with estimation method

Hi, I have a dataset as follows: There are n individuals. Each individual has a fixed amount of money spent on a basket of three goods A, B, C....

• Replies: 0
• Views: 2,469
11-09-2010, 03:07 AM
46. ### Dealing with Null values in Differenced Data

Hi everyone, I'm running a regression analysis to try and explain the effect of advertising on brand interest. Essentially, what I want to be able...

• Replies: 0
• Views: 2,225
11-08-2010, 08:40 PM
47. ### least squares restrictions

Hi there, I want to perform least squares for a lineaar model with linear restrictions on the parameters. The restrictions are also linear with...

• Replies: 0
• Views: 2,073
11-08-2010, 05:40 PM
48. ### transform y to log(y)

Hi, I'm wondering what kind of data is appropriate for transforming the response y into log(y)? ( So the model becomes log(y)= a^x1 +...

• Replies: 10
• Views: 7,286
11-08-2010, 01:43 PM
49. ### Instruments

I have a question concerning endogenous variables. I want to do the following OLS regression: Grade Point Average=constant + φ1 work hours + φ2...

• Replies: 1
• Views: 2,151
11-08-2010, 12:40 PM
50. ### logistic regression

Hi I am using a logistic regression to determine siginificant variables for dependent variable as well as to develop a function to predict the...

• Replies: 0
• Views: 2,270
JFI
11-08-2010, 11:09 AM
51. ### Forecasting assignment (Time series data)

Hi - I am new to this forum and hope to learn a thing or two from you experienced lads! I work at a companacy where we are looking into the...

• Replies: 1
• Views: 4,478
11-08-2010, 07:47 AM
52. ### Finding standard error for elasticity (log-log model)

Hi guys, Can anyone help with this? In(sub) = 3.43 - 0.899 In(Price) + 0.374 In(Age) + 0.141 In(Age)In(Price) + 0.229 In(Characters) The...

• Replies: 0
• Views: 4,948
11-08-2010, 04:04 AM
53. ### results explanation (help please)

After running a bivariate probit model and likelihood ratio for two different categories I got these results, so what do you think of it. any...

• Replies: 0
• Views: 2,061
11-05-2010, 11:12 AM
54. ### How to deal with the dependent predictors in the regression ?

My data have some high correlated predictors, so it fit worse in the linear regression. what regression methods are proposed to solve this...

• Replies: 4
• Views: 3,458
11-04-2010, 11:18 AM
55. ### Need some help with multiple regression

Hi guys. For my project i need to to a regression with a bunch of data I've gathered. I have 7 variables and i did the regression in excel and got...

• Replies: 4
• Views: 2,179
c2q
11-03-2010, 03:28 AM
56. ### Marginal effects after biprobit

Dear Colleagues, I run a biprobit regression and all variables are significant but I found that the sign of the independent variables changes...

• Replies: 0
• Views: 4,580
11-01-2010, 04:32 PM
57. ### Panel: Interaction and centering

Hi guys, I have a panel where I want to run a fixed effects regression with an interaction term. The problem is that one factor of the term is...

• Replies: 0
• Views: 3,526
11-01-2010, 08:12 AM

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