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# Forum: Regression Analysis

Linear regression, linear models, nonlinear regression

1. ### Expressing the sum of squared residuals as a matrix

R, the n by 1 matrix of residuals, is given by y_i, an n by 1 matrix, minus X, an n by 2 matrix consisting of explanatory variables x_1 and x_2(where...

• Replies: 2
• Views: 3,853
06-09-2012, 09:24 PM
2. ### Multiple regression and correlation matrix

Hi. I got some data I am about to present in a report. At first I created a correlation matrix, and there was no statistical significant...

• Replies: 2
• Views: 3,476
06-09-2012, 09:17 PM
3. ### Imputing missing values, and simulating the dependent variable in a regression

Hi all, I've been working on filling in some missing income values in a data set using multiple imputation. To check the validity of my model, I...

• Replies: 0
• Views: 2,607
06-08-2012, 05:08 PM
4. ### Simple question regarding the OLS procedure...

If I understand this equation correctly, if the transpose of x_i is an n by 2 matrix, then is the matrix x_i a 2 by n matrix? But isn't that a weird...

• Replies: 4
• Views: 1,759
06-06-2012, 11:43 AM
5. ### cohort regression analysis?

Is a multiple regression analysis a good test for cohort or even nested cohort? Dependent variable is LDL cholesterol binomial YES?NO? for LDL 240 or...

• Replies: 0
• Views: 1,470
06-06-2012, 11:24 AM
6. ### Variance of a corrected regression coefficient

Ppl I really need help! Please, help me solve it: Consider the model Yi = b0 + b 1Xi +ei e_i~N(0,s^2_e) iid X_i_N(m_x,s^2_x) iid Z_i = X_i +...

• Replies: 1
• Views: 1,571
06-05-2012, 05:20 PM
7. ### The differences between subdistribution hazard ratios and hazard ratios

Hello everybody! I just wondered if someone knows what the differences is between a subdistribution hazard ratios (sHR) and the hazard ratios...

• Replies: 2
• Views: 8,294
06-05-2012, 06:19 AM
8. ### Elasticity with negative predictors

Hello All: I am trying to determine elasticity of demand using relative price position (my price minus competitors price) as the predictor. I know...

• Replies: 2
• Views: 2,003
06-04-2012, 02:00 PM
9. ### how to perform autocorrelation test in panel data analysis?

anyobody knows how to perform autocorrelation test in panel data analysis? the choosen model is fixed effect model. please reply soon

• Replies: 0
• Views: 1,514
06-04-2012, 06:03 AM
10. ### Multiple Logistic Regression: Interpreting Insignificant Variables

I ran a multiple regression, using the following categorical dependent variables which ranked current job satisfaction: 0=not satisfied at all...

• Replies: 1
• Views: 4,735
06-03-2012, 03:47 PM
11. ### Interpreting confidence bands on interaction terms

Dear all, I have a model with three variables a dependent (dep), a binary independent variable (bin) and a contin. independent variable (con). I am...

• Replies: 2
• Views: 2,369
06-03-2012, 04:53 AM
12. ### How are F-Values, R-Square and Adjusted R-Square calculated in Regression?

How are F-Values, R-Square and Adjusted R-Square calculated in Regression Analysis?

• Replies: 0
• Views: 2,178
06-02-2012, 10:55 PM
13. ### Interpreting results: repeated measures logistic regression

I am into some new territory with repeated measures logistic regression. The hypothesis for this study is that treatment will make more less...

• Replies: 7
• Views: 3,185
06-02-2012, 09:24 PM
14. ### Variable shared between IV and DV

Hi all, I was reading a study recently regarding using a measure of code churn to determine whether code is going to be buggy or not. The study...

• Replies: 3
• Views: 2,056
06-02-2012, 09:47 AM
15. ### multiple regression: help needed!

hi: the scenario as follows: correlation between X1 and Y is positive and significant. when ADD X2, the correlation between X1 and Y becomes...

• Replies: 1
• Views: 1,719
06-01-2012, 06:37 AM
16. ### Interaction between dichotomous and interval scaled var

Hi, First of all my research question: Does waiting time at a junction only depend on the traffic but also on the presence of pedestrians? DV=...

• Replies: 0
• Views: 2,236
06-01-2012, 03:45 AM
17. ### question about residual variance

It can found that the resisual variance in linear regression model is definde as squared sum (y_i - (a*x_i+b))^2 divided by n-k where: (x_i, y_i)...

• Replies: 3
• Views: 2,410
05-31-2012, 02:17 AM
18. ### logistic regression or log binomial regression?

Hi all :wave: I wish to look at the association between 2 variables-age at vaccine initiation (continuous) and vaccine completion (binary). I am...

• Replies: 0
• Views: 3,012
05-30-2012, 10:05 AM
19. ### Understanding Prediction Limits

Hi guys! I'm also starting with predictive analysis and regression models. I've managed to get a nice looking prediction formula with 86.8% of R2....

• Replies: 1
• Views: 1,972
05-28-2012, 02:01 PM
20. ### Logistic regression with categorical IV and moderate relation...

Hello! I have a little exercice to do for a stats class... And I need some help. (SPSS program) I have -1 dicho dependant variable -4...

• Replies: 0
• Views: 1,406
TaB
05-28-2012, 12:26 PM
21. ### Beta regression 1 and 0 values

Hi there, I am trying to carry out beta regression but some of the realitzationsof my response varaible are 0 and 1 values and hennce I cannot...

• Replies: 5
• Views: 3,469
05-28-2012, 08:47 AM
22. ### Find the regression equation

Hi I have problem and I want you to help me This problem should use by Minitab.... In a study in collaboration with the Engineering...

• Replies: 5
• Views: 2,678
05-28-2012, 08:06 AM
23. ### Interpreting Multiple Regression vs Correlation

Hi, I'm analysing the results to a satisfaction survey. I want to work out the key drivers of satisfaction so I'm using a question relating to...

• Replies: 4
• Views: 5,200
05-28-2012, 05:58 AM
24. ### Modeling rates, non-normal errors. Alternatives to linear regression

Hi there, I am trying to fit a rate, that is a response variable whose range is between 0 and 100. Because this variable is both upper and...

• Replies: 4
• Views: 2,267
05-27-2012, 01:15 PM
25. ### How to estimate the parameters of LSTR model?

Hi all i try to estimate LSTR model (Logistic Smooth Transition Regression). but i can't undrestand how to estimate the parameters gamma and c...

• Replies: 0
• Views: 2,036
05-24-2012, 05:06 AM
26. ### Difference-in-differences analysis - STATA syntax for binary data

Dear Friends, I am doing Difference-in-differences analysis with repeated cross-sectional data. I have both continuous and binary data. I found...

• Replies: 0
• Views: 6,240
05-24-2012, 03:50 AM
27. ### Moved: Long format for OLS?

• Replies: -
• Views: -
05-23-2012, 12:50 PM
28. ### Is it necessary to do a t-test for a linear regression based on a census?

I retrieved all the average yearly temperature data from years 1899-2011 (113 data points in total) and plotted them and figured a regression line. ...

• Replies: 0
• Views: 2,368
05-22-2012, 05:22 PM
29. ### Consistency of an estimator for nonlinear regression

Dear all, It is stated e.g. in that to prove consistency of an estimator \hat{\theta}_n it is sufficient to prove that the true value ...

• Replies: 1
• Views: 1,628
05-21-2012, 07:44 AM
30. ### non-linear regression time response model

Hi I need to choose a non linear regression model for, protein phosphorylation over time response, for this kind of data Is not like enzyme...

• Replies: 5
• Views: 3,413
05-19-2012, 09:05 AM
31. ### Binary logistic regression with extremely biased response variable

Hi, for a study to be published as a paper, I have collected data in which my binary response variable Y is highly biased towards Y=0 (it's Y=0...

• Replies: 0
• Views: 1,950
05-19-2012, 03:56 AM
32. ### Coefficient of correlation and forcing to pass origin

Hello! I don’t understand much about statistics, so forgive me if this is a very basic question :o I’m working with linear regression, forcing...

• Replies: 4
• Views: 3,896
05-18-2012, 11:26 AM
33. ### How to interpret interactions bt categorical and continous variables?

Hi there, I am struggling with the above problem. I have a dummy variable with 3 categories (total categories=4 so 1 reference category) and a...

• Replies: 3
• Views: 2,272
05-18-2012, 09:06 AM
34. ### Regression Analysis Between Two Independent Variables

Hi, I was hoping you may be able to help me. I'm a uni student writing a dissertation but I think I have bitten off more than I can chew regarding...

• Replies: 0
• Views: 1,176
05-18-2012, 08:59 AM
35. ### Entering predictors sequentially for multinomial logit?

Hello, I have a set of data with a 3-level outcome variable and multiple predictor variables; I am testing a hypothesis about whether a certain...

• Replies: 2
• Views: 2,520
05-17-2012, 11:12 AM

Hi All, I have intercation terms between a categorical variable and a continous variable. Does it make sense to include on one intercation term...

• Replies: 3
• Views: 2,187
05-16-2012, 12:29 PM
37. ### Regression analysis of more than two independent and dependent variables

Hello, I want to find the relationship between independent and dependent variables using regression analysis. There are 5 IV and 4 DV. Please...

• Replies: 8
• Views: 5,449
05-14-2012, 09:50 AM
38. ### GLMM random effect conceptualization

Hello, I have a general question concerning GLMM. I would like to model animal counts as a function of characteristics of the sampling location and...

• Replies: 0
• Views: 1,653
05-14-2012, 08:13 AM
39. ### Regression with two categorical predictors and 1 control/covariate?

Hello, I'm in need of help as these analyses I describe are for my thesis so any input would be greatly appreciated. By the way, I am using IBM...

• Replies: 1
• Views: 2,391
05-14-2012, 03:04 AM
40. ### Calculating Cook's Critical Value

Hey can someone show me how to get F (4,15) (0.5) = 0.8783.

• Replies: 7
• Views: 5,264
05-12-2012, 01:37 PM
41. ### Insignificant coefficient in one model becomes significant in another model--???

Aloha, A multiple regression finding is puzzling my adviser and I. Overall goal--to see if caregiver status (dummy, 0/1) and job variables...

• Replies: 3
• Views: 9,952
05-10-2012, 07:21 PM
42. ### Linear R^2 Values as Percent Weights for Multiple Variable Formula?

Hey guys, Statistics is not my strong suit.. The closest I've been to statistics is a college level Biology II class I took three years ago.. But...

• Replies: 1
• Views: 2,631
05-10-2012, 06:12 PM
43. ### Beginner's Question

Given that you have all the data you need in excel, how fast does it take to derive the equation of the line with it's r2 value? lets say you use...

• Replies: 0
• Views: 1,368
05-10-2012, 06:07 PM
44. ### Significant Correlation, Insignificant Regression

Dear All, I have a highly significant correlation between two variables (A and B). When using a OLS method, however, the relationship between the...

• Replies: 1
• Views: 3,686
05-10-2012, 06:06 PM
45. ### What tools can we use to solve LR equations to get unknown parameter vector?

Greetings, Apologies if my explanations are unclear, I am new to data mining coming from business intelligence development area. Let's say we...

• Replies: 4
• Views: 1,844
05-10-2012, 01:16 PM
46. ### Squared semi partial correlations

Hi I have been developing multiple regression models with 2 predictors. The two predictors are slightly correlated and therefore I am wanting to...

• Replies: 2
• Views: 2,709
05-08-2012, 06:53 AM
47. ### Regression Analysis on cluster of data

I'm currently a student trying to analyze the relation between the cost of marketing and it's observed returns on those costs. obviously, the...

• Replies: 3
• Views: 2,188
05-06-2012, 04:09 PM
48. ### cut-off point for binary logistic regression without ROC curve

Hi! I just want to know how to find a relatively good cut-off point for binary logistic regression model. I haven't learnt anything on ROC curve. Is...

• Replies: 0
• Views: 5,888
05-06-2012, 11:29 AM
49. ### which model to use ?

Hello I have a problem choosing the right model for my data. My response variable is time to event in minutes, when a lower value is better...

• Replies: 3
• Views: 2,218
05-04-2012, 02:02 PM
50. ### Alternatives to Poisson regression for overdispersed count data

Hi all, I'm currently analyzing data from a series of behavioral experiments that all use the following measure. The participants in this...

• Replies: 6
• Views: 2,412
05-04-2012, 11:52 AM
51. ### relative risk ratios and standard errors

Hey forum, Odds ratios or relative risk ratios are calculated by exponentiating the coefficients (from a binary or multinomial logit model),...

• Replies: 2
• Views: 2,874
05-04-2012, 08:17 AM
52. ### Timeseries: sig. Ljung-box Q, but residuals normally distributed

Hi all, Hope someone can help me with the following problem/question I encounter. I'm working with a monthly time-serie consisting of 36 data...

• Replies: 4
• Views: 7,622
05-03-2012, 12:15 PM
53. ### Logistic Regression

I have a sample of 500 older kids and we want to investigate what factors are related to the probability that they will bully. Groups: kids were...

• Replies: 3
• Views: 2,237
05-02-2012, 09:09 AM
54. ### Observation limitation

I am currently doing my dissertation on how China's economic growth contributes to Hong Kong's income inequality after 1997. However, there are only...

• Replies: 0
• Views: 1,763
05-02-2012, 08:31 AM
55. ### multiple regression and mediators

Hi I have 10 independent variables and 1 dependent variable. Of the 10 i have selected 4 variables as my predictors for my multiple regression. I...

• Replies: 4
• Views: 3,945
05-02-2012, 05:57 AM
56. ### Predictors in Logistic regression, SPSS

Hello. I have the problem I can’t deal with. Maybe you can help me? You see, I have 2 samples in retrospective cohort study – cases (include 29...

• Replies: 3
• Views: 3,340
05-01-2012, 02:08 PM

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