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# Forum: Regression Analysis

Linear regression, linear models, nonlinear regression

1. ### Firth regression and AIC-based model selection

Dear all, when using Firth's bias reduction method (Firth 1993) to fit logistic regressions, is it possible (sensible) to compare models using AIC? ...

• Replies: 4
• Views: 347
09-01-2017, 03:41 PM
2. ### Hierarchical Linear Modeling (HLM) Assistance

Sorry if this gets posted twice (it doesn't look like it has posted the first time as of now). I asked a question about fixed vs. random effects...

• Replies: 4
• Views: 239
09-28-2017, 04:40 AM
3. ### Stationarity and White noise

Hi all, I'm just beginning to learn about time series analysis for my final year project at uni and I am confused about stationarity. A time series...

• Replies: 4
• Views: 210
10-03-2017, 04:53 AM
4. ### Converting a continuous variable into a categorical variable (low, medium, high)

I have a continuous dependent variable (scores on an exam) and a number of predictor variables that I'd like to use in a regression analysis, such as...

• Replies: 4
• Views: 114
Yesterday, 10:43 AM
5. ### Improving an estimate of a mean value

Hello, I have a dataset that has 10 independent descriptors and one dependent statistic, b. Only a few of the descriptors are quantitative and...

• Replies: 3
• Views: 3,154
02-28-2006, 11:35 PM
6. ### Need help on deciding the analysis tests

Hello every one, I am doing research in social science. i have following issue for which I need advise: 1. My sample is a snowball sample and...

• Replies: 3
• Views: 2,892
03-16-2006, 08:43 AM
7. ### Combining Regressions

Hi, I have several different regressions for various sites within an area estimating Y from X. I would like to combine all these sites in to...

• Replies: 3
• Views: 7,586
12-28-2007, 11:31 AM
8. ### Do I need to treat all variables in the same way when I transform values?

Hi, I want to carry out a Pearsons correlation to look relationships between methane flux from soil under different plantation treatments (i.e...

• Replies: 3
• Views: 6,458
02-17-2008, 02:13 PM
9. ### Another question re: correlation and regression

I seem to be getting confused between correlation and regression a bit... I'm trying to identify the relationship between a series of X variables...

• Replies: 3
• Views: 2,472
03-20-2008, 11:38 AM
10. ### Dummy Variables and Multiple Regression

Hi, if someone could make this clear for me, would be much appreciated.. Is it possible to create a dummy variable for more than one outcome. ...

• Replies: 3
• Views: 6,249
03-20-2008, 03:09 PM
11. ### Partial R squares

Is there a way to generate partial r-squares (automatically) in multiple regression? Assume a Model Y=X1 X2 X3. GLM produces estimates of R square...

• Replies: 3
• Views: 8,567
03-25-2008, 03:58 PM
12. ### multiple comparisons with multiple regressions?

Hi there, I'm hoping that someone can answer my query or point me in the direction of a reliable source to find out more. My question is - Is the...

• Replies: 3
• Views: 3,339
05-27-2008, 08:36 AM
13. ### very basis question

Hi guys, one very basic question: what is the actual difference between simple linear regression and univariate analysis? examples would be...

• Replies: 3
• Views: 2,989
09-01-2008, 08:25 AM
14. ### Help!

Hi, I'm in the social sciences (psych) using cross sectional data. I'm completing a multiple hierarchical regression looking at interaction...

• Replies: 3
• Views: 2,157
10-16-2008, 07:49 AM
15. ### Factor analysis with non-normal distribution?

Hi all, Does anyone know an alternative to factor anlysis for non-normal distrbutions which explores factors or clusters on a set of 64...

• Replies: 3
• Views: 16,286
11-06-2008, 02:26 PM
16. ### Calculations for the unstandardized coefficients for a multiple regression analysis

I am looking to write a spreadsheet of the calculations for the unstandardized coefficients for a multiple regression analysis (the B values). ...

• Replies: 3
• Views: 18,899
11-11-2008, 04:53 AM
17. ### Urgent help, please...thanks . A.S.A.P

Thanks admin for your ongoing feedback... I am facing this problem with the Leckert Scale...follows: data set to be collected - 5 points:...

• Replies: 3
• Views: 2,816
04-18-2009, 07:21 PM
18. ### 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: 5,508
01-15-2009, 08:43 AM
19. ### Double check sample calculation from pilot study

I am really a neophyte to statistics but am in the middle of a research project and would appreciate someone checking my calculations. I ran a...

• Replies: 3
• Views: 5,904
03-01-2009, 09:28 PM
20. ### Transformed Interactions in Regression

Hi all, I have a quick (but surprisingly difficult) question to ask regarding transformed variables in an interaction term when conducting...

• Replies: 3
• Views: 4,286
03-25-2009, 07:42 PM
21. ### Interpreting a moderation effect

Yesterday I submitted my firts thread but I learnt that it was too vague. I did my work but now I have some doubts interpreting a moderation effect....

• Replies: 3
• Views: 14,230
05-07-2009, 01:50 AM
22. ### 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: 5,545
06-20-2009, 04:55 PM
23. ### Cov in multiple linear regression

For multiple linear regression model Y = Xβ + e, assume X is non-random. Assume Gauss-Markov assumptions hold. Show that variance-covariance matrix...

• Replies: 3
• Views: 5,332
06-19-2009, 09:32 PM
24. ### Which test to use?

I have just learned that I chose the wrong test for my data and I am now at a total loss. Basically I sent out a questionnaire which had a likert...

• Replies: 3
• Views: 2,344
08-01-2009, 02:44 AM
25. ### ANCOVA controversy?

Hello all, I have a question regarding ANCOVA, which seems straightforward, however an answer has eluded me. The question is: Can a...

• Replies: 3
• Views: 12,062
11-03-2009, 08:30 PM
26. ### Problem interpreting Multiple Regression on Video Game Sales

Hi everyone, I am a new member, I am so glad to have found the forum. I'm tearing my hair out about this problem. These are my results: ...

• Replies: 3
• Views: 5,257
11-11-2009, 04:28 PM
27. ### Teaching multivariate statistics: text & software recommendations

Hello all, I'll be leading an introductory seminar to multivariate statistics in the spring and was looking for recommendations for texts that...

• Replies: 3
• Views: 4,370
12-08-2009, 09:54 AM
28. ### NEED HELP on degrees of freedom!!!! URGENT

Hello! I have finished my regression project and am writing my paper for a multiple regression model, but cannot seem to find in notes or online...

• Replies: 3
• Views: 2,432
12-15-2009, 06:17 PM
29. ### Multiple Linear Regression: How to Calculate the Coefficient

This post has been deleted.

• Replies: 3
• Views: 16,148
02-08-2010, 12:03 PM
30. ### Help with Regression Interpretation

Hi - Thanks in advance for any help or advice on this! I know very little about statistics, but I have performed a multiple regression analysis in...

• Replies: 3
• Views: 4,596
03-11-2010, 08:57 AM
31. ### Need help with question

Hye there.I'm new here and joined because needed help with some stats problems.I need help with a problem given below S= 183+0.4122Yi-5926Gi...

• Replies: 3
• Views: 2,417
04-12-2010, 04:13 PM
32. ### How to test INTERACTION

HI THERE, I have started recently using the multiple regression, I am runing now a model where I have 2 continous independent variables, and 4...

• Replies: 3
• Views: 3,527
05-15-2010, 09:22 PM
33. ### Regression brain teaser

I have data for 100 farm ponds. I have data for 4 variables: pollution in the pond, number of cows that graze near the pond, number of pigs that...

• Replies: 3
• Views: 4,028
06-03-2010, 07:41 PM

Currently, I'm trying to create a regression equation that can help my boss predict employee hours for the upcoming month. Basically, if we already...

• Replies: 3
• Views: 2,916
06-25-2010, 01:54 PM
35. ### Degrees of Freedom in case of multiple regression?

What does dof of each predictor show in case of multiple regression? Instead of explaining mathematically, could anyone explain the physical...

• Replies: 3
• Views: 4,380
07-19-2010, 10:21 AM
36. ### negative AIC ?

Hello, I ran model selection by delta AIC but encountered most of the AIC as negative. (R package AICcmodavg and stat : AIC) As reviewed by...

• Replies: 3
• Views: 11,151
08-03-2010, 12:03 PM
37. ### What to do when the continuous dependent variable is zero more than 50% of the time

That's basically the question - What to do when the continuous dependent variable is zero more than 50% of the time? Are there alternatives to...

• Replies: 3
• Views: 5,031
08-03-2010, 04:06 PM
38. ### Review Methodology

Hello, I'm about to embark on some mutivariate regression analysis for my company but it's been a while since I've used these methods. The outputs...

• Replies: 3
• Views: 2,975
08-18-2010, 04:39 PM
39. ### Ordinal Regression: Test of Parallel Lines

Hi, I am trying to fit a model by using ordinal regression. I have got two co-variates, and one factor with four groups. The dependent variable...

• Replies: 3
• Views: 8,229
08-27-2010, 09:47 PM
40. ### 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: 5,549
09-10-2010, 04:35 AM
41. ### How do i create "nice" prediction hyperbola?

I would like to create a nice prediction hyperbola in my regression analysis, at this moment i am only getting some rather ugly ones and only where i...

• Replies: 3
• Views: 3,546
09-16-2010, 03:55 PM
42. ### Linear Regression for Traffic Data

Hi there, I have a two full years of traffic data by month and I am trying to predict traffic for the next two years based on historical growth...

• Replies: 3
• Views: 4,750
10-13-2010, 11:25 AM
43. ### 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...

• Replies: 3
• Views: 5,108
11-23-2010, 06:49 PM
44. ### 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...

• Replies: 3
• Views: 3,040
11-30-2010, 12:34 PM
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...

• Replies: 3
• Views: 5,943
01-17-2011, 08:00 AM
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...

• Replies: 3
• Views: 19,677
01-17-2011, 02:32 PM
47. ### [newbie dumb question] Why is that the assumption of E(u)=0 essential for interences?

If E(u)=0 is violated, how would it affect the inference of parameters, such as by using t-statistics? My understanding is that if E(u)=0 is...

• Replies: 3
• Views: 5,303
02-10-2011, 12:27 AM
48. ### What test can I use to find out which bivariate regression is *significantly* better?

I have three variables: y, x1 and x2 (n=130). I want to know whether one of the x variables is a significantly better bivariate predictor than the...

• Replies: 3
• Views: 2,967
02-16-2011, 01:49 PM
49. ### [Probit] Can I be confident in my results even with a poor Goodness-of-Fit test?

I am running a probit analysis on a data set with about 1000 cases, predicting probability of college graduation by a set of college institutional...

• Replies: 3
• Views: 4,284
02-18-2011, 03:27 PM
50. ### Multi-Level Models with perfectly correlated outcomes

Hello, I am trying to utilize multilevel regression analysis in SPSS (mixed models) to predict outcomes in negotiations between two individuals....

• Replies: 3
• Views: 2,844
03-15-2011, 05:39 AM
51. ### Binary predictors, continuous independent V!

hi everyone I need help with doing a regression model. How can I perform a regression analysis when the only independent variable is a continuous...

• Replies: 3
• Views: 3,817
03-03-2011, 05:52 PM
52. ### Regression Assumptions for Binary Dependent Variable Models?

I was wondering if anyone could direct me to a good source on this, or just answer my question directly. What are the assumptions made for a...

• Replies: 3
• Views: 18,847
03-04-2011, 12:20 PM
53. ### Linear Regression - Theory

Hi Guys, I have some theoretical questions about regression models, I need an answer or true or false for the next few phrases.... 1. Leverage...

• Replies: 3
• Views: 3,362
03-16-2011, 03:16 AM
54. ### Regression results

Hello! I need help with the results of regression analysis. I have significant percentage of variance explained (not big, only 5%), but none of...

• Replies: 3
• Views: 2,876
03-20-2011, 04:43 PM
55. ### Regression in First and Second Differences

I am running a regression in STATA to determine if temperature effects natural gas production in Russia and I am including the following variables...

• Replies: 3
• Views: 16,978
03-22-2011, 05:45 PM
56. ### is this model misspecified

i'm doing a regression on size of company (x) to explain revenue multiple (y). i'm using the companies' revenues and divide them into 5 groups...

• Replies: 3
• Views: 2,712
03-25-2011, 11:12 PM
57. ### Logistic Regression - Residual Deviance > Residual Df

Hi There I'm doing a logistic regression on a set of data with 753 groups of observations (although some groups just have one observation). In...

• Replies: 3
• Views: 9,096
04-03-2011, 08:08 AM
58. ### Linear Regression Coefficient and Multiple Regression Coefficient

Hello Folks: When you use just 2 variables for regression and then when you use the same 2 variables plus an additional 2 other independent...

• Replies: 3
• Views: 8,394
04-07-2011, 08:48 PM
59. ### help with Linear regression with nfl stats please

Hey guys, just wondering if I could get some help with the best way to use my data. After the challenge system was introduced into the nfl in 1999...

• Replies: 3
• Views: 4,276
04-09-2011, 01:19 AM

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