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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...

    Started by bruzzo‎, 12-05-2010 01:55 PM
    • Replies: 1
    • Views: 3,192
    12-05-2010, 06:45 PM Go to last post
  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....

    Started by krytellan‎, 12-04-2010 03:37 AM
    • Replies: 2
    • Views: 6,318
    12-05-2010, 08:11 PM Go to last post
  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...

    Started by ealeql‎, 12-06-2010 07:42 PM
    • Replies: 1
    • Views: 7,804
    12-06-2010, 07:54 PM Go to last post
  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...

    Started by PaulDaniel‎, 12-07-2010 09:16 PM
    • Replies: 1
    • Views: 4,797
    12-07-2010, 10:15 PM Go to last post
  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...

    Started by Link‎, 12-05-2010 12:33 PM
    • Replies: 7
    • Views: 5,856
    12-07-2010, 11:31 PM Go to last post
  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...

    Started by Statanoob‎, 12-08-2010 01:28 PM
    • Replies: 2
    • Views: 3,510
    12-09-2010, 05:39 AM Go to last post
  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...

    Started by SadieKhan‎, 12-09-2010 03:03 PM
    • Replies: 2
    • Views: 2,806
    12-10-2010, 04:23 AM Go to last post
  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...

    Started by sasa81‎, 10-16-2010 04:40 PM
    • Replies: 5
    • Views: 6,974
    12-10-2010, 07:14 AM Go to last post
  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...

    Started by c2q‎, 11-22-2010 08:14 PM
    • Replies: 5
    • Views: 4,310
    12-11-2010, 01:59 PM Go to last post
  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...

    Started by sherwood043‎, 12-11-2010 06:45 PM
    • Replies: 0
    • Views: 4,177
    12-11-2010, 06:45 PM Go to last post
  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...

    Started by elad‎, 12-12-2010 11:23 AM
    • Replies: 0
    • Views: 2,110
    12-12-2010, 11:23 AM Go to last post
  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'...

    Started by Emma2415‎, 12-13-2010 06:31 AM
    • Replies: 0
    • Views: 3,158
    12-13-2010, 06:31 AM Go to last post
  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,...

    Started by thedreamshaper‎, 12-13-2010 07:01 AM
    • Replies: 0
    • Views: 3,119
    12-13-2010, 07:01 AM Go to last post
  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....

    Started by mmeola‎, 12-15-2010 09:01 AM
    • Replies: 0
    • Views: 9,606
    12-15-2010, 09:01 AM Go to last post
  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...

    Started by gankeel‎, 12-15-2010 07:17 AM
    • Replies: 1
    • Views: 2,700
    12-15-2010, 01:11 PM Go to last post
  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...

    Started by Link‎, 12-16-2010 04:59 PM
    • Replies: 7
    • Views: 10,818
    12-17-2010, 10:56 AM Go to last post
  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...

    Started by Injektilo‎, 12-18-2010 07:07 PM
    • Replies: 1
    • Views: 5,430
    12-19-2010, 06:40 AM Go to last post
  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

    Started by drinu_89‎, 12-22-2010 03:07 AM
    • Replies: 2
    • Views: 5,205
    12-26-2010, 07:24 PM Go to last post
  19. Question 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...

    Started by rayuk‎, 12-26-2010 10:33 PM
    • Replies: 2
    • Views: 9,108
    12-26-2010, 11:21 PM Go to last post
  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...

    Started by sach_83‎, 12-28-2010 07:52 AM
    • Replies: 0
    • Views: 2,550
    12-28-2010, 07:52 AM Go to last post
  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...

    Started by rayuk‎, 12-28-2010 10:30 PM
    • Replies: 0
    • Views: 4,056
    12-28-2010, 10:30 PM Go to last post
  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...

    Started by sach_83‎, 12-29-2010 03:55 AM
    • Replies: 2
    • Views: 13,901
    01-01-2011, 01:39 PM Go to last post
  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...

    Started by sach_83‎, 01-01-2011 05:50 PM
    • Replies: 2
    • Views: 7,649
    01-02-2011, 04:33 AM Go to last post
  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...

    Started by blastStu‎, 12-22-2010 04:08 AM
    • Replies: 1
    • Views: 2,532
    01-02-2011, 06:56 AM Go to last post
  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...

    Started by sach_83‎, 01-02-2011 04:37 AM
    • Replies: 1
    • Views: 5,472
    01-02-2011, 07:33 PM Go to last post
  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 =...

    Started by sach_83‎, 01-05-2011 10:45 AM
    • Replies: 0
    • Views: 2,867
    01-05-2011, 10:45 AM Go to last post
  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%...

    Started by momo‎, 11-11-2010 03:51 PM
    • Replies: 7
    • Views: 5,010
    01-06-2011, 07:08 PM Go to last post
  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...

    Started by sweeper‎, 01-07-2011 02:10 PM
    • Replies: 0
    • Views: 2,310
    01-07-2011, 02:10 PM Go to last post
  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...

    Started by cmontalvo‎, 01-08-2011 04:01 PM
    • Replies: 1
    • Views: 2,235
    01-08-2011, 09:36 PM Go to last post
  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...

    Started by Levon‎, 12-27-2010 10:00 AM
    • Replies: 9
    • Views: 18,603
    01-09-2011, 09:35 AM Go to last post
  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...

    Started by Epsilon‎, 01-08-2011 02:08 PM
    • Replies: 1
    • Views: 4,712
    01-09-2011, 01:44 PM Go to last post
  32. Dependent variable as a percentage-which model to use

    Hello, I am dealing with a dependent variable which is a percentage, so which regression model would be better in this case? The histogram and...

    Started by pff‎, 01-07-2011 06:59 AM
    • Replies: 1
    • Views: 6,310
    01-09-2011, 02:08 PM Go to last post
  33. 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:...

    Started by suha‎, 01-09-2011 02:36 PM
    • Replies: 0
    • Views: 5,499
    01-09-2011, 02:36 PM Go to last post
  34. 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...

    Started by pydbl‎, 01-09-2011 11:44 PM
    binary, complete separation, glmer, lmer, mixed effects
    • Replies: 2
    • Views: 4,145
    01-10-2011, 01:00 AM Go to last post
  35. 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. ...

    Started by LBerg‎, 01-10-2011 08:22 PM
    # of predictor variables, sample size
    • Replies: 2
    • Views: 2,954
    01-11-2011, 02:07 AM Go to last post
  36. Significance of regression coefficients and interpretation problems

    Dear All, I am currently facing a problem regarding the statistical interpretation of nonsignificant coefficients. I would like to know whether...

    Started by pff‎, 01-07-2011 06:05 AM
    • Replies: 3
    • Views: 8,153
    01-11-2011, 02:28 PM Go to last post
  37. 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...

    Started by bs0409‎, 11-12-2010 05:28 AM
    • Replies: 2
    • Views: 2,730
    01-13-2011, 08:01 AM Go to last post
  38. 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...

    Started by Rodrigo1981‎, 01-13-2011 09:37 AM
    bayesian beta regression, lack-of-fit
    • Replies: 0
    • Views: 2,715
    01-13-2011, 09:37 AM Go to last post
  39. 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...

    Started by freddysurgery‎, 01-13-2011 11:27 AM
    • Replies: 1
    • Views: 2,121
    01-13-2011, 01:59 PM Go to last post
  40. CLS vs OLS

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

    Started by hazelnut‎, 01-13-2011 08:16 PM
    • Replies: 0
    • Views: 3,840
    01-13-2011, 08:16 PM Go to last post
  41. 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....

    Started by stan09‎, 01-11-2011 11:40 AM
    interaction effect
    • Replies: 1
    • Views: 8,667
    01-13-2011, 08:23 PM Go to last post
  42. Question 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 =...

    Started by sneaks‎, 01-12-2011 11:57 AM
    • Replies: 2
    • Views: 5,389
    01-15-2011, 07:01 AM Go to last post
  43. 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. ...

    Started by Columbine‎, 01-16-2011 02:46 AM
    • Replies: 0
    • Views: 4,331
    01-16-2011, 02:46 AM Go to last post
  44. 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...

    Started by alexandros__23‎, 01-15-2011 07:39 PM
    • Replies: 5
    • Views: 25,021
    01-16-2011, 01:24 PM Go to last post
  45. 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...

    Started by alexandros__23‎, 01-16-2011 03:33 PM
    • Replies: 3
    • Views: 5,892
    01-17-2011, 08:00 AM Go to last post
  46. 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...

    Started by juacochero‎, 01-17-2011 10:49 AM
    • Replies: 3
    • Views: 19,615
    01-17-2011, 02:32 PM Go to last post
  47. partial R2 in multivariate linear regression

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

    Started by juanpe000‎, 01-18-2011 07:12 AM
    • Replies: 0
    • Views: 5,661
    01-18-2011, 07:12 AM Go to last post
  48. 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...

    Started by jayde‎, 01-20-2011 04:03 AM
    multiyear data
    • Replies: 4
    • Views: 3,417
    01-20-2011, 11:17 AM Go to last post
  49. Unhappy 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 ...

    Started by smile:D‎, 01-20-2011 10:58 AM
    sxx, syy
    • Replies: 1
    • Views: 3,149
    01-20-2011, 12:04 PM Go to last post
  50. 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...

    Started by tko778‎, 01-21-2011 01:25 PM
    • Replies: 1
    • Views: 4,162
    01-22-2011, 12:23 AM Go to last post
  51. Red face Stepwise Regression

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

    Started by kimrayjan‎, 01-21-2011 03:19 PM
    multiple regression, r square, stepwise, variance
    • Replies: 1
    • Views: 3,600
    01-23-2011, 01:06 AM Go to last post
  52. 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...

    Started by tim999‎, 01-23-2011 08:16 AM
    • Replies: 2
    • Views: 11,222
    01-23-2011, 12:39 PM Go to last post
  53. 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...

    Started by Rigal@mnhn.fr‎, 01-23-2011 07:31 PM
    aic, ecology, information criterion, model selection
    • Replies: 0
    • Views: 3,864
    01-23-2011, 07:31 PM Go to last post
  54. 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...

    Started by unstandardizedB‎, 01-26-2011 03:32 PM
    regression, unstandardized b
    • Replies: 0
    • Views: 5,441
    01-26-2011, 03:32 PM Go to last post
  55. 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...

    Started by 2282‎, 01-26-2011 03:49 PM
    • Replies: 1
    • Views: 3,015
    01-26-2011, 10:15 PM Go to last post
  56. 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...

    Started by drGG‎, 01-27-2011 08:42 AM
    • Replies: 0
    • Views: 2,875
    01-27-2011, 08:42 AM Go to last post
  57. 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...

    Started by jayde‎, 01-27-2011 09:13 AM
    • Replies: 0
    • Views: 2,654
    01-27-2011, 09:13 AM Go to last post
  58. Exclamation 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,...

    Started by acocac‎, 01-27-2011 06:59 PM
    gauss, nonlinear
    • Replies: 0
    • Views: 2,437
    01-27-2011, 06:59 PM Go to last post
  59. 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...

    Started by amarkham‎, 01-27-2011 09:29 PM
    • Replies: 0
    • Views: 2,271
    01-27-2011, 09:29 PM Go to last post
  60. Exclamation Need Help - Dummy variable for GDP per capita

    Please answer the following questions...

    Started by Vedruss‎, 01-29-2011 08:45 AM
    • Replies: 1
    • Views: 3,840
    01-29-2011, 09:39 AM Go to last post

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