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Forum: Regression Analysis

Linear regression, linear models, nonlinear regression

1. univariate vs multivariate

Hi, I have a question about interpreting univariate vs. multivariate (linear) regression. When I'm reading journal articles often both approaches...

• Replies: 5
• Views: 40,710
04-02-2013, 05:41 AM
2. Logistic regression and correlation

Hi I'm building an account management scorecard with logistic regression. Some of the variables have quite large correlations, but they get selected...

• Replies: 5
• Views: 10,942
04-24-2013, 05:00 PM

Hello all, I predict an u-shaped relation between two variables, y and x. If I perform a quadratic linear regression, i.e. use a model like ...

• Replies: 5
• Views: 2,351
08-04-2012, 07:46 AM
4. What does Durbin Wason for Time Series test for?

Does the Durbin-Watson test for seasonality effect? If the p-value <.05 then there is reason to believe that some type of seasonality (whether it be...

• Replies: 5
• Views: 2,785
08-16-2012, 01:49 PM
5. Multiple Time Series Regression? Time Series with multiple independent variables

• Replies: 5
• Views: 20,364
09-26-2012, 09:03 AM
6. Statistical Analysis - Multiple Regression?

Hi I am struggling through my 4th year thesis - so very stuck on the data set and the best way of testing my hypotheses. I apologise if my question...

• Replies: 5
• Views: 1,835
08-24-2012, 11:10 PM
7. Appropriateness of fixed effect model for temporal/ spatial effects (Ecology)

Hello, I hope you can help me with this. I'm in the throes of finishing my masters thesis, and am stumbling on my model. I've talked a lot with...

• Replies: 5
• Views: 2,423
09-01-2012, 10:54 AM
8. what is the highest number of variables to use for regression analysis?

Hi, Just wanted to ask what people thought was the highest number of variables could be used with regression analysis? Also, are there other...

• Replies: 5
• Views: 1,272
09-01-2012, 01:43 PM
9. Effect size in multiple regression

Hello, I'm using this this calculator to determine a rough sample size for a multiple regression (20 predictors). ...

• Replies: 5
• Views: 6,616
09-20-2012, 11:30 AM
10. Regression where variables cannot be below a certain value

Hello, to quickly describe my general situation, I am trying to model total cost based on certain services used in a hospital. So for example, I want...

• Replies: 5
• Views: 1,658
09-24-2012, 03:01 PM
11. How to assess Goodness-of-fit

I have fitted a set of data points to an exponential decay curve of the equation: y=A+Be^(-t). I wish to assess the quality of fit. Is it OK if...

• Replies: 5
• Views: 2,002
09-30-2012, 11:48 AM
12. Multiple Regression - Multicollinearity

Hi I'd really appreciate it if anyone could help me with this. I'm doing statistics coursework as part of a Psychology degree and have come across...

• Replies: 5
• Views: 1,893
11-12-2012, 03:58 AM
13. Linear regression - Controlling the pre-measure of my response variable

Hello everyone! :wave: Context: I want to analyze the change in anxiety scores (STAI) in a group of patients undergoing surgery and relate it to...

• Replies: 5
• Views: 3,121
11-14-2012, 11:53 AM
14. 22 enough for multiple regression?

Hello guys, i am doing a thesis on a given industry having only 22 enterprises. As the population size is small i have decided to go for census. But...

• Replies: 5
• Views: 1,902
11-20-2012, 02:58 AM
15. Choosing the best dependent variable (Y)

Hello, I'm working on a multiple regression model. The dependent variable (Y) is an ordered multinomial qualitative variable. To do regression...

• Replies: 5
• Views: 3,068
12-03-2012, 05:03 AM
16. Logistics Regression and Mediation

Hey, I'm soon to be using data from a large cohort. Ideally I want to look at whether depressive symptoms in childhood effects attentional...

• Replies: 5
• Views: 2,828
04-09-2013, 04:18 PM
17. Regression sample size

Members, Please let me know if i can do a regression analysis for a sample size 40 with 8 predictor variables?

• Replies: 5
• Views: 3,305
01-24-2013, 05:24 AM
18. Hypothesis Testing in Regression

I have fit a multilinear regression with response Y and predictors x1, x2, x3, x4 and x5. I have constructed a hypothesis i wish to test. The null is...

• Replies: 5
• Views: 2,944
05-07-2013, 11:58 PM
19. Logistic model interpretation - insignificant main effect, significant interaction

Hi! I am running a logistic regression model where I investigate what characteristics matter when a group of people chooses representatives for...

• Replies: 5
• Views: 5,303
04-10-2013, 05:19 PM
20. Comparing 2 multiple regression model???

Hi im new here and to tell the truth i'm still learning about stat and struggling a little bit in my thesis so my question is what should i use is...

• Replies: 5
• Views: 1,809
01-11-2013, 09:34 AM
21. Regression with only positive values

Hi, I'm new and I don't have much mathematical knowledge, just the basis. I have 13 independent variables, and I'm trying to know how much each of...

• Replies: 5
• Views: 3,480
01-08-2013, 05:07 PM
22. Regression Model is signifianct but all explanatory variables are insignifiant!!!

Hi all, I need your help is the following: My Model is as the following Dependent variable is GDP per capita growth rate Explanatory...

• Replies: 5
• Views: 1,305
01-24-2013, 05:35 AM
23. Question about dealing with missing values in regression

Hey guys, I have a dataset with ~50 variables, but my dataset is incomplete. For some of these variables (e.g. those for gender) i have created...

• Replies: 5
• Views: 1,368
01-09-2013, 05:40 PM
24. bivariate regression question

Hi everyone: I am have conducted bivariate regression analysis to examine the effect of: an (x) independent variable, age (nominal) on a (y)...

• Replies: 5
• Views: 2,672
03-15-2013, 02:52 PM
25. Logistic Regression: To dummy code or not to? Which backward elimination to use?

I have 10 binary dependent variables (disease prevalence: yes/no, 1/0). I want to do a logistical regression with each of them with the following...

• Replies: 5
• Views: 16,386
02-22-2013, 11:13 AM
26. Logistic Regression: Odds Ratio Estimate=1

Hi, I am working with a logistic regression which I got as result the odds ratio estimate equals 1 for some predictive variables. As odds ratio=1,...

• Replies: 5
• Views: 1,569
04-18-2013, 12:03 PM
27. Regression more than two Y variables

Hi, sorry this is probably a very stupid question! I'm just trying to finish m thesis proposal and have just realised that my statistics are wrong. I...

• Replies: 5
• Views: 3,517
02-04-2013, 02:12 PM
28. Independent variables: 1 to 5 star rating

Hello, I'm having a little difficulty specifying two independent variables; Customer Score and Expert Score. The reviews are each assigned 1 to...

• Replies: 5
• Views: 2,629
04-25-2013, 12:11 AM
29. Lots of regressions!

Hi, I need to run a whole slew of regressions for a study. Should I use a more strict cut-off (e.g. p<0.01) and why? Thanks in advance! Jvic

• Replies: 5
• Views: 1,480
05-03-2013, 08:05 AM
30. Specific and common variables

Hello! I'm trying to build a regression model for forecasting. The problem is that some parameters, are common for all observations and one of them...

• Replies: 5
• Views: 1,901
05-06-2013, 12:08 PM
31. Asasociation between two series of measurements

I have series of (metric) lab variables measured in a group of patients, with once daily measurements over 20 days, and I would like to investigate...

• Replies: 5
• Views: 1,313
05-23-2013, 06:04 AM
32. Comparing linear regressions - what method to use?

I have a number of measurements of the initial reaction rate of x reactions. Assuming linearity until t = y gives me x linear regressions with...

• Replies: 5
• Views: 1,791
06-01-2013, 09:04 AM
33. What kind of regression analysis should I use?

Dear All, I would like to conduct a regression analysis on a data set which includes dicrete inputs (Xs). The purpose is to have a regression...

• Replies: 5
• Views: 2,646
06-14-2013, 01:49 AM
34. Regression Equation : Looking for some help

Hi buddies, I'm new here and trying to learn SPSS. To be honest, do not have good knowledge on it. looking for some help. Would really be thankful...

• Replies: 5
• Views: 2,447
08-01-2013, 06:47 PM
35. [SOLVED] Robust regression

I am new to this method. SAS uses one of two alternates to generate the weights that are central to addressing outliers in robust regression. One is...

• Replies: 5
• Views: 1,919
07-01-2013, 05:17 PM
36. Unordered categorical variables and linear regression

Hi everyone, I am new to this forum and still sort of a novice with regards to statistics. In my M.A. thesis I use one binary dependent...

• Replies: 5
• Views: 3,769
07-26-2013, 01:04 PM
37. Standardized regression coefficients - why?

Hello everybody :wave: When doing a multiple linear regression analysis, you would often like to know which predictor variable has the most...

• Replies: 5
• Views: 2,126
07-18-2013, 08:57 AM
38. Mediation analysis with the DV following a gamma distribution.

Hi there, I am in the early stages of data analysis and could really use some advise. Basically, I am testing whether music tempo influences...

• Replies: 5
• Views: 1,233
07-05-2013, 12:01 AM
39. Interpreting multiple regression analysis

Hello, I hope someone knows what the answer is to my question: I have a multiple regression analysis. Dependent variable is performance (time)...

• Replies: 5
• Views: 1,740
08-01-2013, 12:39 PM
40. Interaction effect and model interpretation

Hello all, Hoping someone can help with a model selection question... I'm testing the degredation rates of DNA (amount of error in...

• Replies: 5
• Views: 2,626
07-29-2013, 10:08 AM
41. New To Regression Analysis, Positive Beta should be negative?

Hey everyone, new to the community and looking for some help. Would greatly appreciate any input you're able to offer! I'm currently in the...

• Replies: 5
• Views: 2,729
08-01-2013, 12:29 PM
42. How to do Curve fit for data

I am not able to fit curve for the data I have, and need some help. I removed metal from water and obtained the following results: days Removal...

• Replies: 5
• Views: 1,738
08-28-2013, 10:56 AM
43. How to deal with collinearity?

I am wondering what methods everyone uses to deal with collinearity. I recently came across this article http://bit.ly/14wDcgH But it doesn't really...

• Replies: 5
• Views: 4,869
09-09-2013, 03:14 PM
44. continuous dep variable with several indip dicotomic variables: which statistic?

Hello there! I have to analyze these results: my dependent variable is continuous (blood levels of a substance) I have several indipendent...

• Replies: 5
• Views: 2,490
09-04-2013, 08:30 AM
45. LH ratio significant but covariates not?

I have performed Cox regression analysis using Forward LR method. As a results two covariates are included in the final model. First one has two...

• Replies: 5
• Views: 1,763
09-06-2013, 10:06 AM
46. Repeated Measures ANOVA (Split-Plot ANOVA) analysis of residuals

Hi, how to process decent residual analysis in repeated measures? I know that the residuals should have normal distribution (altogether an in...

• Replies: 5
• Views: 3,928
09-10-2013, 07:02 AM
47. Normalized dependent variable in regression

Hello I have normalized my DV to have normal residuals for regression analysis using natural logarithm transformation. However I'm confused about...

• Replies: 5
• Views: 6,868
10-21-2013, 08:11 AM
48. Multiple regression analysis-coefficient table

Hi, I am currently working on a project which requires a multiple regression analysis (using enter-standard method) and I am stuck with...

• Replies: 5
• Views: 1,894
szm
11-22-2013, 04:55 PM
49. Linear correlation coefficient with a yes or no variable...

Please pardon my ignorance as I have not had statistics in 20 years. I would like to attempt correlate student GPA with use of an ipod during school...

• Replies: 5
• Views: 2,450
11-19-2013, 01:14 PM
50. Ordinal Regression: Parallel Lines Test

Hi All, I'm analyzing survey results with many responses coming in the form of Likert scales. In this case, I actually have two Likert scale...

• Replies: 5
• Views: 8,245
10-31-2013, 12:56 PM

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