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# Forum: Regression Analysis

Linear regression, linear models, nonlinear regression

1. ### Problem with interpretation of regression coefficients

Hi, I have problem with interpretation of regression coefficients. My regression function is: y = a + b1*x + b2*x^2 How can I interpret b1...

• Replies: 5
• Views: 1,820
04-25-2015, 04:01 PM
2. ### Estimation with negative coefficients

Hi, I have probably an easy problem, however I'm not really sure how to do it: Basically, I would like to estimate a linear regression with OLS. So...

• Replies: 4
• Views: 1,396
04-25-2015, 09:57 AM
3. ### Stepwise Regression with solution limited to max # independent vars - Best approach?

I am using MiniTab for stepwise regression. I have 25 independent variables I want to run through the stepwise procedure. However, I want the...

• Replies: 0
• Views: 1,369
04-21-2015, 06:01 PM
4. ### Regression analysis for periodic data

I am working on a hedging model for commodity.I have past 36 months data of commodity market price and future contracts price. e.g. on 1st...

• Replies: 0
• Views: 1,783
04-21-2015, 01:29 AM
5. ### DEA Analysis

Hi, I'm currently looking for some materials on DEA Analysis. Do you guys have any e-books or good webpages on this topic? I seek a material...

• Replies: 5
• Views: 2,056
04-16-2015, 06:57 AM
6. ### MLM (binary) Odds Ratio Interpretation

In the following paper on MLM with a binary outcome: http://analytics.ncsu.edu/sesug/2014/SD-13.pdf It provides the following OR...

• Replies: 2
• Views: 1,788
04-15-2015, 01:08 PM
7. ### Problem - stationarity and relevance

Hi all, I am doing my Bachelor's thesis at the moment and I ran into a problem I was hoping you could help me out with. While running my data...

• Replies: 0
• Views: 1,045
04-15-2015, 05:12 AM
8. ### Averaging x and y before fitting regression model

Hi everyone:wave::wave::wave: I have faced problem in my research when i fit a regression model my question is can i make moving average for...

• Replies: 0
• Views: 2,121
04-14-2015, 02:34 PM
9. ### order determination sample size for autoregression

Hi I am new to autoregression. I want to determine the order of an autoregression given a sample of size S1. I plan to use ordinary least...

• Replies: 0
• Views: 1,791
04-13-2015, 12:44 PM
10. ### Data Normalization

I have a problem that is challenging to me about fitting coefficient parameter. Here is the problem data (simple example) ...

• Replies: 1
• Views: 1,763
04-10-2015, 01:43 PM
11. ### PROC Means for dummy variables in SAS

I have created a dummy variable in SAS, that in any given year takes the value 1 if both countries are members of the EMU and 0 otherwise in that...

• Replies: 2
• Views: 1,887
04-10-2015, 11:54 AM
12. ### Force a regression coefficient to be negative

I have a regression problem using variable X to predict Y. That is, Y = c + A*X + error. For the regression problem, we need that A must be...

• Replies: 4
• Views: 2,369
04-09-2015, 08:10 PM
13. ### Dummy variable for EMU countries

Hello everyone :-) I have a dataset for 22 countries with 12 variables, where this two are important for this assigment: country1 Three-letter...

• Replies: 0
• Views: 1,876
04-09-2015, 12:51 PM
14. ### Semivariogram and kriging

Hello All, I am having problem with semivariogram. Say, there is three points (1,4),(2,1),(3,3). The results at this points are 50, 40 ,25. I want...

• Replies: 0
• Views: 1,420
04-08-2015, 08:43 PM
15. ### SSE and b1 are independent? How can I prove that?

at simple linear regression, are b1 and SSE independent. but how can i prove that? :confused: my text book said 'SSE is independent of each of...

• Replies: 0
• Views: 1,538
04-08-2015, 03:41 AM
16. ### Cox/ Binomial Regression: How to reconcile Non-significant model with significant IVs

Hello I'm been performing some survival and regression analyses corresponding to an event of interest being death or a certain surgical procedure,...

• Replies: 2
• Views: 2,044
04-07-2015, 06:03 PM
17. ### Stepwise Regression Help

Hi, Statistics is not my strong suit and I could really use some help. I'm wondering if it is possible to do a stepwise regression with 9 IVs on...

• Replies: 0
• Views: 2,233
04-07-2015, 04:00 PM
18. ### Regression Analysis and Residual analysis from Minitab output

The questions are on Regression and Analysis and Residuals. I need some explaining oh how to find and answer these questions just from a minitab...

• Replies: 0
• Views: 1,781
04-07-2015, 10:57 AM
19. ### Regression help

I ran a regression of event sales (y) and advertising spending (x). I got the following results: Correlation: .055 R2: .003 N: 438 y = 1.28x +...

• Replies: 6
• Views: 2,108
04-07-2015, 10:16 AM
20. ### Regression analysis

Hi all. Could I use linear regression with not normal distributed variable?

• Replies: 6
• Views: 2,401
04-06-2015, 11:39 AM
21. ### Multiple variable regression(BUT only one coefficient to be estimated)

Dear, For our master thesis we need to regress the equation Pt-P(t-1)= S/2*(Qt-Q(t-1))+Beta*S/2*(Qt-1)+et or http://prntscr.com/6q81o8 It...

• Replies: 0
• Views: 1,275
04-06-2015, 06:11 AM
22. ### Validation for prognostic marker

Dear All, I am completely lost in the area of statistics. I have a dataset of 265 cancer patients with a novel protein marker as well as the known...

• Replies: 3
• Views: 2,207
04-05-2015, 12:24 PM
23. ### Regression

When performing regression analysis on excel with data that has been condensed, should you expand the data before creating the analysis table. For...

• Replies: 1
• Views: 1,990
04-05-2015, 06:53 AM
24. ### Need Help on this question about Ratio of two parameters

I need help on this question: Suppose we have two independent samples from one population: Global Sample(Xg,Yg) and Local Sample(Xl,Yl) And we...

• Replies: 0
• Views: 1,152
04-02-2015, 10:14 AM
25. ### How to find Significant difference in R2

Hi My study requires comparing the regression square got from accounting policy 1 and from accounting policy 2. Same set of samples are used in...

• Replies: 0
• Views: 1,857
04-02-2015, 02:23 AM
26. ### Fisher r to z transform / significance test for two different values of r^2

Short version: I have two values of r^2 from Pearson's correlation, one from a control group (.713) and one for an experimental (.527), and I would...

• Replies: 1
• Views: 2,575
04-01-2015, 08:10 AM
27. ### Does rate of change in proportion variable depend on ranked independent variable?

I am doing an analysis on the prevalence of a drug resistance mutation in a particular country and how prevalence changed over time. Samples were...

• Replies: 0
• Views: 969
03-31-2015, 07:38 PM
28. ### Interaction terms with non-signficant main effects

I am using a logit model to do the analysis on my dissertation data. 2 of the variables interact, so I have an interaction term. My question is 2...

• Replies: 2
• Views: 1,319
03-31-2015, 01:35 PM
29. ### Timeseries: Evaluating Var models

I have build some var models with different types of variables and now I want to try to evaluate them and see wich one is the best But when I look...

• Replies: 0
• Views: 1,135
03-30-2015, 01:10 PM
30. ### Logistic Regression model: a significant predicting variable with low sensitivity?

Hi fellow forum members! Thank you in advance for your time! I used binary logistics regression (SPSS) to determine the relationship between...

• Replies: 1
• Views: 2,469
03-30-2015, 03:38 AM
31. ### Which test to use (f or t) to test the validity of Okun's Law

Hello, I'm doing a simple linear regression on Okun's law and I need to do a statistical test on the validity of my model. I have two variables;...

• Replies: 0
• Views: 1,004
03-29-2015, 11:59 PM
32. ### How to compare 2 ORs from different regression models.

I created a logistic regression model to predict an outcome of depression vs. no depression. There are several variables in the model including...

• Replies: 2
• Views: 2,423
03-29-2015, 08:32 PM
33. ### Panel data ??

Hi, I want to knwo if an historic of 8 years is good enough for using the panel data model with 25 country ?

• Replies: 0
• Views: 1,348
03-29-2015, 03:48 PM
34. ### Tolerable Serial Correlation/ Auto-Correlation by a Regression Analysis

Hi, is there a similar rule for the tolerable serial correlation/ auto-correlation by a regression analysis like the maximum-minimum quotient...

• Replies: 0
• Views: 1,267
03-29-2015, 02:31 PM
35. ### Tolerable Heteroskedasticity/ Variance Inhomogenity

Hello, a long time ago I have read somewhere, that a regression can overcome heteroskedasticity/ variance inhomogenity up to certain amount. It...

• Replies: 2
• Views: 1,681
03-29-2015, 02:23 PM
36. ### p value of the constant, can I ignore it?

I'm analysing the influence of various factors on hare harvests in a specific are. E.g. How do the hare harvests change when the fox harvests...

• Replies: 1
• Views: 1,604
03-29-2015, 10:31 AM
37. ### Discretization of a continuous variable

He guys, I'm analyzing a research regarding patients and their risk factors for developing a certain side effect. If i enter age as a continous...

• Replies: 14
• Views: 3,480
03-28-2015, 09:53 AM
38. ### Confidence for pooled within group slope

In SPSS simple linear regression one can get the confidence limits either side of the linear regression slope simply by ticking the "prediction...

• Replies: 2
• Views: 1,218
03-28-2015, 03:18 AM
39. ### Regression with several mediators

Hello there :) Although this is connected to SPSS; I think this is the more appropriate place. Im making a linear regression and have several...

• Replies: 0
• Views: 1,280
03-25-2015, 08:24 AM
40. ### Approaches for multivariate nonlinear parametric regression?

I have some data that is nonlinear, but is curvilinear. It is two factors and a dependent variable. Each factor has a pretty good fit when applying a...

• Replies: 1
• Views: 1,247
03-24-2015, 06:45 PM
41. ### Logistic regression using dummies with dependent "holes"

Hi, I'm trying to do do a logistic regression using R. I want to regress using binary dependent variable Y as granted or not grated (1 or 0)...

• Replies: 0
• Views: 1,524
03-24-2015, 06:15 PM
42. ### Controlling mediation effect in a binary logistic regression

Hi everbody, It's my first post and I hope I posted in the right forum. In my master thesis I use binary logistic regression: a dichotomous...

• Replies: 2
• Views: 2,942
03-24-2015, 03:14 PM
43. ### Generalized Linear Mixed Models without mixed effects. A meaningless question?

Hi there, I know what fixed and random effects in linear models or GLM are. I am using Generalized Linear Mixed Models (GLMM) to handle this. So...

• Replies: 3
• Views: 1,431
03-23-2015, 09:02 PM
44. ### relation within Gauss-Newton method for minimization

If we study model fit on a nonlinear regression model Y_i=f(z_i,\theta)+\epsilon_i, i=1,...,n, and in the Gauss-Newton method, the update on...

• Replies: 0
• Views: 1,123
03-23-2015, 12:02 PM
45. ### Panel Data Model. Problem !

Hi everyone, First, Ihave to mention that I am newbie in statistic so I may have some evident questions ! Actually, I am working on a...

• Replies: 2
• Views: 1,663
03-23-2015, 11:51 AM
46. ### Multiple regression: one of my significant factors has outliers, what should I do?

So I ran a multiple regression and found two factors that explained one of my dependent variables quite well. The problem is that one of the two...

• Replies: 2
• Views: 2,133
03-22-2015, 07:29 AM
47. ### [Log.reg.] Can I include confounder that does not have all categories of exposure?

Hello. I am working on a thesis in public health science, and am stuck until this current problem i solved. Your help will be highly appreciated! ...

• Replies: 0
• Views: 1,083
03-21-2015, 04:51 AM
48. ### Weighted Regression

I have a few questions in regards to setting up and running my weighted regression: Firstly, some background. I am comparing point of subjective...

• Replies: 1
• Views: 1,687
03-17-2015, 10:36 PM
49. ### Hierarchical regression in SPSS (how to enter interactions when you have a quadratic)

Hello there! I want to confirm if I am entering my variables in the proper way in SPSS for multiple regression. I have four variables: 1) student...

• Replies: 3
• Views: 2,508
03-17-2015, 03:32 PM
50. ### How do I select a method of regression analysis - Allometry - Animal Growth - Gnu

I am analysing the growth of the wildebeest or gnu. To do this I am comparing the changes in A: Body length (L), B: Girth (G) and C: Shoulder height...

• Replies: 2
• Views: 2,573
Gnu
03-17-2015, 01:04 AM
51. ### Centering Variables in Interaction with Lagged Dependent Variable

I have to run this regression: Y (t) = a + b1 X (t-1) + b2 Y (t-1) + b3 X (t-1)*Y (t-1) Y at time "t" is regressed using as IVs X at time t-1,...

• Replies: 1
• Views: 1,502
03-16-2015, 05:04 PM

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