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# Forum: Regression Analysis

Linear regression, linear models, nonlinear regression

1. ### 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: 3,192
12-05-2010, 06:45 PM
2. ### 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: 6,318
12-05-2010, 08:11 PM
3. ### 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: 7,804
12-06-2010, 07:54 PM
4. ### 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: 4,797
12-07-2010, 10:15 PM
5. ### 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: 5,856
12-07-2010, 11:31 PM
6. ### 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: 3,510
12-09-2010, 05:39 AM
7. ### 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: 2,806
12-10-2010, 04:23 AM
8. ### 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: 6,974
12-10-2010, 07:14 AM
9. ### 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: 4,310
12-11-2010, 01:59 PM
10. ### 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: 4,177
12-11-2010, 06:45 PM
11. ### 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: 2,110
12-12-2010, 11:23 AM
12. ### 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: 3,158
12-13-2010, 06:31 AM
13. ### 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: 3,119
12-13-2010, 07:01 AM
14. ### 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: 9,606
12-15-2010, 09:01 AM
15. ### 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: 2,700
BGM
12-15-2010, 01:11 PM
16. ### 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: 10,818
12-17-2010, 10:56 AM
17. ### Combining Regression and PCA scores

I work in market research, and we're often asked to run regression to determine the impact of various components (like product attributes) on overall...

• Replies: 1
• Views: 5,430
12-19-2010, 06:40 AM
18. ### Regression for CAPM.. Finance

I am testing CAPM (a financial model) using regression. Would It be correct to say that 'c' (the constant) is equal to the alpha? Thanks

• Replies: 2
• Views: 5,205
12-26-2010, 07:24 PM
19. ### equivalence of t-test and F-test in ANOVA

Something about ANOVA is confusing me. Say you have a regression model: y = b0 + b1*x1 (where b0 and b1 are coefficients and x1 is an...

• Replies: 2
• Views: 9,108
12-26-2010, 11:21 PM
20. ### Multiple regression with spss

Hi All, I have done multiple regression in SPSS with three different methods, namely, FORWARD, BACKWARD and STEPWISE. Final outcome is...

• Replies: 0
• Views: 2,550
12-28-2010, 07:52 AM
21. ### Logistic regression: constant variance of Pearson residual condition

I am currently trying to create a logistic regression model. I know that for good model's the variance of Pearson Residual should be approximately...

• Replies: 0
• Views: 4,056
12-28-2010, 10:30 PM
22. ### Multiple regression with SPSS

Hi All, I have done multiple regression in SPSS with three different methods, namely, FORWARD, BACKWARD and STEPWISE. Final outcome is...

• Replies: 2
• Views: 13,901
01-01-2011, 01:39 PM
23. ### How to check the importance of Dummy variable in multiple regression?

Hi All, I am doing a Multiple regression with one non numeric independent variable. I changed this variable into a dummy variable which is now...

• Replies: 2
• Views: 7,649
01-02-2011, 04:33 AM
24. ### Regression and Monte Carlo Randomisation

Hi all, I'm currently working with some data in which there are 33 groups of 3 people, with roughly 100,000 datapoints per group. There are two...

• Replies: 1
• Views: 2,532
01-02-2011, 06:56 AM
25. ### Cook distance and leverage

I have a data point for which leverage value is > 3(p+1)/n but the value of cook's distance is < 1. Can i say that, this is an outlier but it is...

• Replies: 1
• Views: 5,472
01-02-2011, 07:33 PM
26. ### Transformation of variable

Hi All, I am doing simple linear regression and there is curvilinear curve in the scatter plot of the independent and dependent variable. y =...

• Replies: 0
• Views: 2,867
01-05-2011, 10:45 AM
27. ### P value results

Dear Colleagues I did a bivariate regression using 10 independent variables on each dependent variable. all the results are significant at 95%...

• Replies: 7
• Views: 5,010
01-06-2011, 07:08 PM
28. ### Multinomial Regression

have a dependent variable with 2+ categories and I know how to run multinomial regression with it. However, in multinomial regression you need to...

• Replies: 0
• Views: 2,310
01-07-2011, 02:10 PM
29. ### Easy question

Dear friends: I hope you can help me with this question: I have data of the identity for the GDP=C+I+G+X-M. If I regress C+I+G+X-M, in log...

• Replies: 1
• Views: 2,235
01-08-2011, 09:36 PM
30. ### multiple regression with *many* variables

Hello I am not a statistician but interested in knowing how the following problem would be approached by those who are. What would you do if...

• Replies: 9
• Views: 18,603
01-09-2011, 09:35 AM
31. ### Heteroscedasticity

Hello, I've done a search on this but have not found any similar threads. Using EVIEWS White test I have identified heteroscedasticity in my...

• Replies: 1
• Views: 4,712
01-09-2011, 01:44 PM
32. ### How to convert logistic Coefficient into percentage %

Hi Please I need help with conveting logistic Coefficient into percentage % to help me with analysing the regression. Regards Mod Note:...

• Replies: 0
• Views: 5,499
01-09-2011, 02:36 PM
33. ### Problem with mixed effects model with binary data

Hi guys, I have a question about logit mixed effects model. I tried to use lmer to fit a model with binary dependent variable (Yes or No), a...

• Replies: 2
• Views: 4,145
01-10-2011, 01:00 AM
34. ### Reference for max vars in a model

I used 7 predictor variables in a regression model with a sample size of 103. Someone who reviewed my manuscript said that was too many predictors. ...

• Replies: 2
• Views: 2,954
01-11-2011, 02:07 AM
35. ### Sparse Logistic regression

What method should be used when the proportions of 1's in a logistic regression problem is very low. (lets say 0.04%)???? Normal logistic method...

• Replies: 2
• Views: 2,730
01-13-2011, 08:01 AM
36. ### Lack to fit in bayesian beta regression model

Hello! I have a question about beta regression model. I fitted a bayesian beta regression. - Coefficients are probabilistically (using the...

• Replies: 0
• Views: 2,715
01-13-2011, 09:37 AM
37. ### Random effect

Hello everybody! I have some problems making a regression. I am told that to correct my data by using random effect. I don'nt know how this...

• Replies: 1
• Views: 2,121
01-13-2011, 01:59 PM
38. ### CLS vs OLS

What is the difference between classical least squares regression (CLSR) and linear least squares regression (also known as ordinary least squares...

• Replies: 0
• Views: 3,840
01-13-2011, 08:16 PM
39. ### Interpreting Interactions in Binary Logistic Regression

Hi! I was wondering if anyone knows how to interpret interactions in SPSS, for logistic regressions, or how a good source that might outline this....

• Replies: 1
• Views: 8,667
01-13-2011, 08:23 PM
40. ### Reporting hierarchical regression

I have a 2-step hierarchical regression. Step 1 Variable A = significant p<.001 Step 2 Variable A = now non significant Variable B =...

• Replies: 2
• Views: 5,389
01-15-2011, 07:01 AM
41. ### Poisson GLM: data set use; influence of counts

Hello Regression form, I am after a explanation in layman's terms of what's going on behind the scenes with a couple of GLM analyses I'm doing. ...

• Replies: 0
• Views: 4,331
01-16-2011, 02:46 AM
42. ### Insignificant regression explanation-HELP!!!

Hi, As part of my dissertation I am doing a regression analysis in which I am examining if gender, age, Internet use, education and occupational...

• Replies: 5
• Views: 25,021
01-16-2011, 01:24 PM
43. ### Collinearity

Hi, Is there any possibility that if colinearity exists between two or more DV variables in a regression analysis, the regression analysis to be...

• Replies: 3
• Views: 5,892
01-17-2011, 08:00 AM
44. ### Regression R2 vs Spearman's correlation

Hi everyone! I have a set of data that shows a very good Spearman's correlation coefficient (p=0,001), but when i calculate a regression equation...

• Replies: 3
• Views: 19,615
01-17-2011, 02:32 PM
45. ### partial R2 in multivariate linear regression

Hi there! I´m performing multivariable linear regression models with SPSS. I would like to know how can I calculate partial R2 for the independant...

• Replies: 0
• Views: 5,661
01-18-2011, 07:12 AM
46. ### Desperately Need Help with Regression Analysis..Please :)

hello :) I'm new here (and in doing statistics in general). I have to do a regression analysis on panel data (10 groups, 9 years - 90...

• Replies: 4
• Views: 3,417
01-20-2011, 11:17 AM
47. ### i cant understand this question :|

Hi everyone , i had small problem with this question i don't know what Sxx Syy Sxy and C.I mean? i wanna find the roles to follow but i couldn't ...

• Replies: 1
• Views: 3,149
01-20-2011, 12:04 PM
48. ### Panel Data and model specification

Sorry to ask questions which may be obvious to many, but I am just starting out with Stata and econometrics so if anyone could help me I would really...

• Replies: 1
• Views: 4,162
01-22-2011, 12:23 AM
49. ### Stepwise Regression

When a variable is added and then removed in stepwise regression, what happens to the proportion of the variance it explained?

• Replies: 1
• Views: 3,600
01-23-2011, 01:06 AM
50. ### multinomial logistic regression vs multivariate logistic regression

multinomial logistic regression vs multivariate logistic regression. Is there differences??? If so how to do with spss multivariate logistic...

• Replies: 2
• Views: 11,222
01-23-2011, 12:39 PM
51. ### AIC number of parameter

Dear all, I am new in this forum. I m facing a problem with my AIC. I m using model selection framework (Akaike’s weights) with various type...

• Replies: 0
• Views: 3,864
01-23-2011, 07:31 PM
52. ### Interpreting unstandardized coefficients and their strength

Hi, I conducted a multiple regression analysis with 2 independent variables. Now I'm trying to analyze the strength of these variables between men...

• Replies: 0
• Views: 5,441
01-26-2011, 03:32 PM
53. ### identification with ordinal independent variable

Hi, Can you help me find the relevant literature for this problem? My regression model is: Yi=Xi*b+Ei, where Yi is income and Xi is a score, Ei...

• Replies: 1
• Views: 3,015
01-26-2011, 10:15 PM
54. ### GLM repeated measurements with very large database

I am trying to perform a multivariate regression analysis in SPSS. The problem is the database is very large (one variable contains over 200.000...

• Replies: 0
• Views: 2,875
01-27-2011, 08:42 AM
55. ### LSVD regression - how many dummies

hey, I'm back and making progress :) I want to run a LSDV regression on my panel data. How many dummies do I have to include? All of them for...

• Replies: 0
• Views: 2,654
01-27-2011, 09:13 AM
56. ### Help Non linear Growth Models - Derivates

Hi!!! im amateur in mathemathicals growth models but im doing my graduated work in adjust five differents models in some growth parameters in onion,...

• Replies: 0
• Views: 2,437
01-27-2011, 06:59 PM
57. ### Need help! Fairly simple questions.

Hey guys, So I successfully proved that the sum of epsilons (the e in y=B0+B1*x+e) equaled 0. Now how do I prove that the sum of xi's...

• Replies: 0
• Views: 2,271
01-27-2011, 09:29 PM
58. ### Need Help - Dummy variable for GDP per capita

• Replies: 1
• Views: 3,840
01-29-2011, 09:39 AM

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