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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...

    Started by Link‎, 12-16-2010 04:59 PM
    • Replies: 7
    • Views: 10,875
    12-17-2010, 10:56 AM Go to last post
  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...

    Started by gankeel‎, 12-15-2010 07:17 AM
    • Replies: 1
    • Views: 2,730
    12-15-2010, 01:11 PM Go to last post
  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....

    Started by mmeola‎, 12-15-2010 09:01 AM
    • Replies: 0
    • Views: 9,647
    12-15-2010, 09:01 AM Go to last post
  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,...

    Started by thedreamshaper‎, 12-13-2010 07:01 AM
    • Replies: 0
    • Views: 3,179
    12-13-2010, 07:01 AM Go to last post
  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'...

    Started by Emma2415‎, 12-13-2010 06:31 AM
    • Replies: 0
    • Views: 3,205
    12-13-2010, 06:31 AM Go to last post
  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...

    Started by elad‎, 12-12-2010 11:23 AM
    • Replies: 0
    • Views: 2,134
    12-12-2010, 11:23 AM Go to last post
  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...

    Started by sherwood043‎, 12-11-2010 06:45 PM
    • Replies: 0
    • Views: 4,206
    12-11-2010, 06:45 PM Go to last post
  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...

    Started by c2q‎, 11-22-2010 08:14 PM
    • Replies: 5
    • Views: 4,349
    12-11-2010, 01:59 PM Go to last post
  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...

    Started by sasa81‎, 10-16-2010 04:40 PM
    • Replies: 5
    • Views: 7,031
    12-10-2010, 07:14 AM Go to last post
  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...

    Started by SadieKhan‎, 12-09-2010 03:03 PM
    • Replies: 2
    • Views: 2,847
    12-10-2010, 04:23 AM Go to last post
  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...

    Started by Statanoob‎, 12-08-2010 01:28 PM
    • Replies: 2
    • Views: 3,574
    12-09-2010, 05:39 AM Go to last post
  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...

    Started by Link‎, 12-05-2010 12:33 PM
    • Replies: 7
    • Views: 5,928
    12-07-2010, 11:31 PM Go to last post
  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...

    Started by PaulDaniel‎, 12-07-2010 09:16 PM
    • Replies: 1
    • Views: 4,867
    12-07-2010, 10:15 PM Go to last post
  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...

    Started by ealeql‎, 12-06-2010 07:42 PM
    • Replies: 1
    • Views: 7,857
    12-06-2010, 07:54 PM Go to last post
  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....

    Started by krytellan‎, 12-04-2010 03:37 AM
    • Replies: 2
    • Views: 6,377
    12-05-2010, 08:11 PM Go to last post
  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...

    Started by bruzzo‎, 12-05-2010 01:55 PM
    • Replies: 1
    • Views: 3,237
    12-05-2010, 06:45 PM Go to last post
  17. Red face 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,...

    Started by GraceJones‎, 11-29-2010 12:16 PM
    • Replies: 1
    • Views: 3,793
    12-05-2010, 04:02 PM Go to last post
  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...

    Started by Sausage‎, 12-04-2010 04:03 PM
    • Replies: 0
    • Views: 4,172
    12-04-2010, 04:03 PM Go to last post
  19. Question 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...

    Started by toni_azoulay‎, 12-03-2010 11:47 PM
    • Replies: 2
    • Views: 10,557
    12-04-2010, 01:23 AM Go to last post
  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...

    Started by StatsGuy112233‎, 12-01-2010 11:39 PM
    • Replies: 1
    • Views: 4,733
    12-04-2010, 01:08 AM Go to last post
  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?

    Started by Biostat212‎, 12-02-2010 04:27 PM
    • Replies: 6
    • Views: 3,965
    12-03-2010, 04:14 AM Go to last post
  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...

    Started by emelie_earlgrey‎, 11-25-2010 01:58 PM
    • Replies: 3
    • Views: 3,048
    11-30-2010, 12:34 PM Go to last post
  23. Point me in the right direction

    Hi there, I am currently trying to determine the relationship between a spot price and a contract price. My spot price is obviously moving...

    Started by marketing-grad‎, 11-29-2010 11:42 PM
    • Replies: 2
    • Views: 3,657
    11-30-2010, 01:00 AM Go to last post
  24. 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...

    Started by kron3007‎, 11-29-2010 01:54 PM
    • Replies: 1
    • Views: 4,307
    11-29-2010, 01:55 PM Go to last post
  25. 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...

    Started by hank755‎, 11-28-2010 10:31 AM
    • Replies: 2
    • Views: 2,892
    11-28-2010, 06:32 PM Go to last post
  26. Arrow 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...

    Started by rafters‎, 11-27-2010 02:13 PM
    • Replies: 0
    • Views: 4,027
    11-27-2010, 02:13 PM Go to last post
  27. 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...

    Started by Dxbugs‎, 11-26-2010 08:22 AM
    • Replies: 1
    • Views: 2,616
    11-26-2010, 08:44 AM Go to last post
  28. Arrow 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...

    Started by rafters‎, 11-24-2010 06:07 PM
    • Replies: 0
    • Views: 2,873
    11-24-2010, 06:07 PM Go to last post
  29. Modelling business data

    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...

    Started by gcam032‎, 11-24-2010 09:37 AM
    • Replies: 0
    • Views: 2,430
    11-24-2010, 09:37 AM Go to last post
  30. 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,...

    Started by dnh‎, 11-22-2010 04:09 PM
    • Replies: 9
    • Views: 4,440
    11-24-2010, 08:45 AM Go to last post
  31. 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...

    Started by c2q‎, 11-23-2010 06:14 PM
    • Replies: 3
    • Views: 5,122
    11-23-2010, 06:49 PM Go to last post
  32. 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...

    Started by floriandotti‎, 11-23-2010 12:06 AM
    • Replies: 4
    • Views: 2,773
    11-23-2010, 12:03 PM Go to last post
  33. Exclamation 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...

    Started by Anbrhave‎, 11-23-2010 07:55 AM
    • Replies: 0
    • Views: 4,797
    11-23-2010, 07:55 AM Go to last post
  34. 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...

    Started by floriandotti‎, 11-23-2010 12:09 AM
    • Replies: 1
    • Views: 4,180
    11-23-2010, 01:01 AM Go to last post
  35. 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...

    Started by saaagar‎, 11-21-2010 04:48 AM
    • Replies: 0
    • Views: 4,309
    11-21-2010, 04:48 AM Go to last post
  36. 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. ...

    Started by Thebear‎, 11-20-2010 12:43 PM
    • Replies: 0
    • Views: 2,850
    11-20-2010, 12:43 PM Go to last post
  37. 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...

    Started by dml123‎, 11-19-2010 04:59 AM
    • Replies: 0
    • Views: 2,381
    11-19-2010, 04:59 AM Go to last post
  38. 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...

    Started by kron3007‎, 11-18-2010 05:26 PM
    • Replies: 1
    • Views: 6,845
    11-18-2010, 11:24 PM Go to last post
  39. 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...

    Started by EgZeKuToR‎, 11-18-2010 03:22 PM
    • Replies: 0
    • Views: 4,275
    11-18-2010, 03:22 PM Go to last post
  40. 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...

    Started by bbkaran‎, 11-17-2010 05:58 AM
    • Replies: 0
    • Views: 2,393
    11-17-2010, 05:58 AM Go to last post
  41. 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...

    Started by kogan.clark‎, 11-15-2010 11:15 PM
    • Replies: 0
    • Views: 2,554
    11-15-2010, 11:15 PM Go to last post
  42. 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...

    Started by floriandotti‎, 11-14-2010 10:02 PM
    • Replies: 1
    • Views: 2,479
    11-15-2010, 12:13 PM Go to last post
  43. Factor Analysis

    I ran the factor analysis, but I want to make sure I have the groupings right. I am attaching my analysis and the rotated component matrix has...

    Started by drdokter‎, 11-13-2010 09:31 AM
    • Replies: 1
    • Views: 2,351
    11-13-2010, 02:15 PM Go to last post
  44. 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...

    Started by momo‎, 11-12-2010 09:27 AM
    • Replies: 0
    • Views: 5,407
    11-12-2010, 09:27 AM Go to last post
  45. 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,...

    Started by gabeo‎, 11-10-2010 02:37 AM
    • Replies: 4
    • Views: 11,513
    11-12-2010, 05:30 AM Go to last post
  46. multiple regression

    Hi , i have three variables for the question below.For each scenarios that is gulf view houses and no gulf view houses. The variables are sale...

    Started by SadieKhan‎, 11-09-2010 06:12 PM
    • Replies: 4
    • Views: 8,517
    11-10-2010, 01:06 AM Go to last post
  47. 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...

    Started by aesopclimber‎, 11-09-2010 04:43 AM
    • Replies: 0
    • Views: 2,895
    11-09-2010, 04:43 AM Go to last post
  48. 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....

    Started by gabeo‎, 11-09-2010 03:07 AM
    • Replies: 0
    • Views: 2,469
    11-09-2010, 03:07 AM Go to last post
  49. 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...

    Started by statguy_33‎, 11-08-2010 08:40 PM
    • Replies: 0
    • Views: 2,225
    11-08-2010, 08:40 PM Go to last post
  50. 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...

    Started by leo nidas‎, 11-08-2010 05:40 PM
    • Replies: 0
    • Views: 2,073
    11-08-2010, 05:40 PM Go to last post
  51. 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 +...

    Started by zzzc‎, 10-22-2010 08:12 PM
    • Replies: 10
    • Views: 7,286
    11-08-2010, 01:43 PM Go to last post
  52. Question Instruments

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

    Started by Anbrhave‎, 11-03-2010 05:56 AM
    • Replies: 1
    • Views: 2,151
    11-08-2010, 12:40 PM Go to last post
  53. 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...

    Started by JFI‎, 11-08-2010 11:09 AM
    • Replies: 0
    • Views: 2,270
    11-08-2010, 11:09 AM Go to last post
  54. 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...

    Started by VBA2010‎, 11-08-2010 05:42 AM
    • Replies: 1
    • Views: 4,478
    11-08-2010, 07:47 AM Go to last post
  55. Exclamation 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...

    Started by cuteylion‎, 11-08-2010 04:04 AM
    • Replies: 0
    • Views: 4,948
    11-08-2010, 04:04 AM Go to last post
  56. 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...

    Started by momo‎, 11-05-2010 11:12 AM
    • Replies: 0
    • Views: 2,061
    11-05-2010, 11:12 AM Go to last post
  57. Arrow 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...

    Started by purple‎, 11-03-2010 01:39 PM
    • Replies: 4
    • Views: 3,458
    11-04-2010, 11:18 AM Go to last post
  58. 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...

    Started by c2q‎, 11-02-2010 10:40 PM
    • Replies: 4
    • Views: 2,179
    11-03-2010, 03:28 AM Go to last post
  59. 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...

    Started by momo‎, 11-01-2010 04:32 PM
    • Replies: 0
    • Views: 4,580
    11-01-2010, 04:32 PM Go to last post
  60. 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...

    Started by Nardo‎, 11-01-2010 08:12 AM
    • Replies: 0
    • Views: 3,526
    11-01-2010, 08:12 AM Go to last post

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