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# Forum: Regression Analysis

Linear regression, linear models, nonlinear regression

1. ### Multiple Regression Analysis of a time series

Hello everyone! I'm trying to use multiple regression analysis of a time series, but I've run into a problem interpreting the data. First, I've...

• Replies: 0
• Views: 5,866
02-04-2008, 05:48 PM
2. ### 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: 5,866
12-07-2010, 11:31 PM
3. ### Collinearity help

I saw a suggestion on a web page for dealing with collinearity I had not seen before. http://www2.chass.ncsu.edu/garson/pa765/tacq.htm "Treat...

• Replies: 5
• Views: 5,831
06-28-2011, 07:51 AM
4. ### 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: 5,818
05-06-2012, 11:29 AM
5. ### Stepwise Regression

Let Y = Company Sales X1 = Overall Industry Sales X2 = Advertising Expenditure X3 = Special Promotion by Competitor (0 = Yes, 1 = No) Using...

• Replies: 2
• Views: 5,812
04-26-2010, 02:30 PM
6. ### Relative weights (people's thoughts)

I recently came across a paper and an R function to calculate relative weights. When I do Hierarchical block-wise multiple regression I'm always...

• Replies: 1
• Views: 5,789
09-17-2012, 09:53 PM
7. ### Interpreting the conclusion of t-test and explaining the p-value

Hi, I'm working on an assignment which asks me to interpret the conclusion of my t-test regarding the average reading score and the student teacher...

• Replies: 0
• Views: 5,767
03-21-2012, 02:13 AM
8. ### Goodness of fit for Mixed effects Logistic Regression

Dear all, I am trying to assess the goodness of fit of random effects Logistic regression. a) I would have used a Hosmer-Lemeshow test, but how...

• Replies: 4
• Views: 5,764
12-02-2013, 09:52 PM
9. ### Mixed effects logistic Regression

I have what I believe is a mixed effects logistic regression. My outcome is injury (y/n) and I have subject level (age, gender, smoking) and Class...

• Replies: 3
• Views: 5,749
08-28-2013, 07:06 AM
10. ### Interaction effect in a logistic regression between cont and cat variables.

Hi guys, I am conducting a logistic regression on whether a participants test positive or not to HIV (1=positive; 0 Negative) in a sample of...

• Replies: 19
• Views: 5,746
04-30-2013, 10:28 AM
11. ### Logit coefficients interpretation...

Logistic regression Number of obs = 1315 LR chi2(32) = ...

• Replies: 2
• Views: 5,745
12-22-2011, 05:37 AM
12. ### Logistic regression with dependent variables

Dear All I'm trying to perform logistic regression to determine risk factors for retinopathy of prematurity (ROP). The outcome is binary 1=...

• Replies: 4
• Views: 5,736
10-06-2010, 06:35 PM
13. ### What's a logistic regression?

Hello, in college we learned multiple regression techniques (different models: linear, log-lin, lin-log, exponential, ...) - including all the...

• Replies: 4
• Views: 5,696
12-30-2007, 05:45 PM
14. ### Why does the coefficient change sign when another variable is added to the OLS model?

Dear all, I am trying to run an OLS regression in Stata 13, with log of per capita calorie as my dependent variable and age and years of education...

• Replies: 7
• Views: 5,678
12-19-2014, 04:27 PM
15. ### collinearity and Heteroscedasticity in bivariate probit model

Hi, all I run a bivariate probit regression, and I am not specialized in statistics and I dont know how to check collinearity and...

• Replies: 0
• Views: 5,670
10-14-2010, 03:32 PM
16. ### 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: 5,666
01-18-2011, 07:12 AM
17. ### coding for dummy variable

Hello all, I am wondering why dummy variables should always be coded either 0 or 1. For example, does it make any mathematical difference in...

• Replies: 2
• Views: 5,649
03-17-2011, 07:26 AM
18. ### Confidence Interval for Prediction in Weighted Regression

Hi everyone, I'm currently writing my final year project in analytical chemistry, and have got to the stage of calculating confidence intervals...

• Replies: 0
• Views: 5,636
03-22-2009, 12:39 PM
19. ### Can you guys check these for me

Shade answers to T/F questions and type letter answer to multiple choice questions next to problem number. Chapters 13 & 14 included. T F 1. If a...

• Replies: 1
• Views: 5,631
12-08-2008, 03:33 PM
20. ### All my coefficients are statistically significant

Hi All, I am running a fixed effects model in stata, but all my independent variables are statistically significant. I am wondering if I am doing...

• Replies: 18
• Views: 5,626
10-03-2013, 06:21 PM
21. ### Hypothesis

If you got this model: mode 1) y=a +b1x1 + b2x2 + u and this: mode 2) y=a + b1(x1-x2) + u What do you call the restriction there has...

• Replies: 19
• Views: 5,620
08-15-2011, 09:21 AM
22. ### Multiple Regression with Multiple Groups

Hello, I am looking at predictor variables (scores on partner perception measures) on a criterion variable (relationship satisfaction), in order to...

• Replies: 9
• Views: 5,594
11-26-2008, 06:58 PM
23. ### Regression analysis for a cross sectional study

Good morning all. I am supposed to perform a regression analysis for a crossectional survey, using STATA. The thing is i dont know where to...

• Replies: 0
• Views: 5,590
03-24-2011, 12:14 AM
24. ### Degrees of freedom for a moving average?

Can someone please help me to determine the correct number of degrees of freedom used when calculating a moving average? For example, with annual...

• Replies: 0
• Views: 5,590
Joz
09-11-2012, 12:36 AM
25. ### R-square and interactions (multiple regression)

Hi, I am doing a GLM regression analysis and have a question about interactions and model fit. My dependent variable is 'salary', and I have...

• Replies: 1
• Views: 5,583
03-16-2010, 08:50 PM
26. ### bootstrap correlation

Hi, I am wondering if is it correct to use bootstrap methods to get an estimate of correlation coefficient (Pearson) when data violate some of the...

• Replies: 2
• Views: 5,582
10-08-2010, 02:09 AM
27. ### Logistic regression diagnostic questions

I have a set of 42 variables which I am trying to determine the relative importance of. Well I already did but now I am trying to determine if...

• Replies: 19
• Views: 5,566
03-20-2013, 10:40 AM
28. ### Regression with non- parametric data....

Hello! I have conducted the normality test Anderson-Darling on my data, and with a p value of <0,010, I guess that the data are not normal...

• Replies: 8
• Views: 5,556
03-26-2012, 03:42 AM
29. ### Multiple Linear Regression and likelihood Ratio Test

Hi All, I have completed multiple regressions with one model including an interaction term, and the other not including the interaction term. ...

• Replies: 4
• Views: 5,553
11-06-2013, 09:22 PM
30. ### Combining regression with time series

Using an existing time series of supermarket sales data I need to make a forecast. Basically a simple exponential smoothing model explains future...

• Replies: 2
• Views: 5,549
04-19-2012, 05:59 AM
31. ### Box-Tidwell procedure

Hello everyone, Is there a possibility to perform Box-Tidwell procedure in SPSS, or any other convenient software? Thanks.

• Replies: 0
• Views: 5,549
06-28-2012, 04:38 PM
32. ### standardizing residuals

Hi All, I'd like to standardize residuals. Can anybody tell me the formula to standardize to mean 0 and standard deviation 1? I also do not...

• Replies: 3
• Views: 5,536
09-10-2010, 04:35 AM
33. ### Regression SS in multiple linear regression

In MULTIPLE linear regression, is it still true that the regression sum of squares is equal to ∑ (Y_i hat -Y bar)^2 ??? My textbook defines...

• Replies: 3
• Views: 5,533
06-20-2009, 04:55 PM
34. ### Constructing Prediction Intervals for Forecasted Values in a Time Series

I have a time series with 231 data points and the following descriptive statistics: Mean 75,231.66 Standard Error 969.98 Median 70,728.00 ...

• Replies: 3
• Views: 5,524
09-18-2013, 09:14 AM
35. ### 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: 5,505
01-09-2011, 02:36 PM
36. ### Logistic regression or DFA?

Hi! I am trying to get my masters thesis done. I am taking a statistics course right now, but I need to get started on things sooner rather than...

• Replies: 3
• Views: 5,501
01-15-2009, 08:43 AM
37. ### Help with non-linear regression, SPSS

Hey all New to the forums and was hoping for some help with writing out part of a non-linear regression model from somebody brighter than me. So...

• Replies: 2
• Views: 5,500
10-19-2010, 10:02 AM
38. ### How to avoid collinearity in regression

Hi there, I am new in statistics so my question will be a bit naive. When I perform regression, some variables are excluded. It is, maybe, because...

• Replies: 9
• Views: 5,498
09-09-2012, 06:57 AM
39. ### Poisson regression and effects of predictors

Dear all, I just registered this forum too, since I am in doubt what to do! In a study, I want to determine the effects of grazing by animals...

• Replies: 4
• Views: 5,493
08-24-2011, 06:50 AM
40. ### 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: 5,478
01-02-2011, 07:33 PM
41. ### adding skewness and kurtosis to CAPM - regression

Suppose I have a set of monthly returns of a stock, monthly 'market' returns and some risk free rate for lets say 10 years. Performing an usually OLS...

• Replies: 1
• Views: 5,475
12-18-2015, 07:26 PM
42. ### Count data independent variable

I am going to run a regression using count data as independent variables, with the dependent variables being the amount of investment in £. Given...

• Replies: 3
• Views: 5,446
05-13-2013, 10:32 AM
43. ### 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: 5,445
01-26-2011, 03:32 PM
44. ### 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: 5,436
12-19-2010, 06:40 AM
45. ### how to enter certain data, and should i use t test?

Hi all,:wave: I'm new here and need life saving help with my MEd dissertation! I'm studying moral development (SRMS SCORE) and play opportunities...

• Replies: 2
• Views: 5,427
08-18-2008, 04:38 AM
46. ### Stepwise and all-possible-regressions

Hi all, Before I start I just wanted to cordially thank you all for this great community...I really admire the work you have done...and the...

• Replies: 14
• Views: 5,415
01-29-2013, 12:19 AM
47. ### Expectation/ Variance/ ACF and PACF in ARMA(2,1)

Hello guys, I hope I'm not posting in the wrong subforum. I am looking for a solution to calculate E, Var, and ACF and PACF coefficents in an...

• Replies: 1
• Views: 5,413
06-17-2011, 08:09 PM
48. ### 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: 5,399
05-14-2012, 09:50 AM
49. ### 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: 5,390
01-15-2011, 07:01 AM
50. ### Bayesian approach for logistic regression models? (the case of low-count cells)

so... now that i'm a PhD student my advisor wants me to help out people with their projects. as fate may have it, the same problem has arisen both in...

• Replies: 15
• Views: 5,390
12-10-2013, 01:54 PM
51. ### Unequal sample size among sub-groups: Effects on significance levels?

Hello, I just came across a finding which I find somewhat strange: I conducted a quite simple multiple regression analysis in a dataset that...

• Replies: 6
• Views: 5,388
07-25-2013, 02:37 AM

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