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# Forum: Regression Analysis

Linear regression, linear models, nonlinear regression

1. ### β and b

Hi, Just starting with regression analysis but am confused with the interchangeability of β and b. Can someone clarify the difference? Thank...

• Replies: 3
• Views: 1,105
05-11-2015, 05:31 PM
2. ### Determining if Cook's D is influential

Hi there, I have been having a lot of difficulty calculating if Cook'd values are influential. I realise that there are no exact rules, but I am...

• Replies: 0
• Views: 396
05-10-2015, 09:55 PM
3. ### Logistic regression - Violations of observations independence

Hi, I need some help about logistic regression. My participants were divided in 2 groups (control group and experimental group). They then...

• Replies: 0
• Views: 562
05-09-2015, 04:56 PM
4. ### Combining variables prior to performing regression analysis

Hello to all. I am running a regression analysis to evaluate if the joint analysis of costs and benefits can explain medicinal plant selection better...

• Replies: 3
• Views: 741
05-08-2015, 06:01 PM
5. ### Regression Excel Output - Missing Values

Hey guys, I've attached a screen shot of the table we have to use for my stats final. This is what we had on the midterm earlier this semester...

• Replies: 0
• Views: 441
05-08-2015, 10:06 AM
6. ### Question creating a statistical Analysis for treatment validation with placebo cond.

Hi there, promising board of infinite knowledge, 1. Randomizing the Conditions This is what I want to do. One individual, two conditions. ...

• Replies: 0
• Views: 381
05-08-2015, 06:03 AM
7. ### One observation per factor level combination in regression

Hi... I was wondering if you can perform multiple linear regression with a mix of categorical and quantitative variables, if you only have one...

• Replies: 2
• Views: 563
05-07-2015, 10:46 PM
8. ### Linear Regression - Influence of experience on wage

Hello Talk-Stats-Members, i am new to the forum and already have a (in my eyes) complex theoretical problem that i hope you can help me with. I...

• Replies: 4
• Views: 571
05-06-2015, 04:30 PM
9. ### Interpreting PROCESS Output

Hi everyone, Does anyone know of any good resources to help interpret the process macro output, specifically for model 14? I have the book but it...

• Replies: 3
• Views: 1,372
05-06-2015, 11:11 AM
10. ### [SPSS - Logistic Regression] Resolve the linearity of logit assumption

I am running a logistic regression and my income variable violates the linearity of the logit assumption. It is not negatively effecting the...

• Replies: 3
• Views: 1,929
05-06-2015, 09:42 AM
11. ### RESET test Statistic

Below is my question - I've never done a RESET calculation before so just seeking some guidance on how to start. I believe I need to add a quadratic...

• Replies: 1
• Views: 493
05-05-2015, 11:13 PM
12. ### Normally/non-normally distributed data - initial significance testing

Hi all, I would be grateful if anyone can direct me please. I am looking to 1. look at predictors of my DV (when controlling for confounders)...

• Replies: 1
• Views: 398
05-04-2015, 05:39 PM
13. ### optimal sample size

I'm performing a regression analysis (OLS) and I have the luxury that my sample size is very high (5.000 observations) compared to the number of...

• Replies: 6
• Views: 759
05-04-2015, 12:25 PM
14. ### how to control foe age-wave1 when running a mixed model analysis

Hi guys, I am running a linear mixed model in SPSS. My research question is: Does a reward-related personality trait at baseline predict weight...

• Replies: 0
• Views: 389
05-01-2015, 07:57 PM
15. ### P-Values equal to zero

Hi, I am running simple OLS regressions on forward and spot price data and have been getting p-values equal to exactly 0 (i.e. not 0.0000000234) for...

• Replies: 1
• Views: 514
04-30-2015, 11:05 PM
16. ### How to separate categorical variables in modeling

Suppose I have a dataset as follows: Product Week Type Num times ad shown Purchases 1 2/2/13 young,old,hipster ...

• Replies: 0
• Views: 413
04-30-2015, 11:32 AM
17. ### Probit Regresion

Hi all. What does categ.(factors) and count data mean in probit regression? Categ.(factors) mean covariate or something like that?

• Replies: 2
• Views: 459
04-30-2015, 08:51 AM
18. ### How can you deal with categorical variables that aren't present in your training set?

Let's say I have the following linear regression: earnings = c0 + age * c1 + male * c2 where "male" is a categorical variable and "female" is...

• Replies: 1
• Views: 451
04-30-2015, 03:37 AM
19. ### Comparing two linear regression gradients?

Hi, I am completely new to linear regression so this may sound daft, but I'm wondering if its possible to test for a significant difference between...

• Replies: 6
• Views: 1,729
04-29-2015, 10:08 AM
20. ### Comparing Models

Today I was going to attempt to figure out and write some SAS code to compare nested linear models (variance explained). But I need some basics...

• Replies: 8
• Views: 717
04-28-2015, 02:31 PM
21. ### multilevel modelling: predicting random effects for new clusters

Hi: I have a query I'm hoping someone may be able to help with. I've chatted to a few people and looked at texts and the literature but haven't...

• Replies: 9
• Views: 1,152
04-28-2015, 12:13 PM
22. ### Interpret continuous variables in binary regression model

I have produced three binary regression models, each showing the odds ratios (ORs) for an outcome (attendance versus non-attendance) Each...

• Replies: 7
• Views: 701
jle
04-28-2015, 02:58 AM
23. ### Difference-in-Differences(Evaluate effect of a policy implemented gradually)

Hi I have to do a diff-in-diff estimator in order to evaluate the impact of the policy. The problem is that the policy is gradually implemented...

• Replies: 0
• Views: 507
04-25-2015, 08:15 PM
24. ### 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: 720
04-25-2015, 05:01 PM
25. ### 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: 580
04-25-2015, 10:57 AM
26. ### 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: 443
04-21-2015, 07:01 PM
27. ### 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: 442
04-21-2015, 02:29 AM
28. ### 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: 902
04-16-2015, 07:57 AM
29. ### 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: 662
04-15-2015, 02:08 PM
30. ### 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: 421
04-15-2015, 06:12 AM
31. ### 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: 520
04-14-2015, 03:34 PM
32. ### 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: 494
04-13-2015, 01:44 PM
33. ### 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: 513
04-10-2015, 02:43 PM
34. ### 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: 647
04-10-2015, 12:54 PM
35. ### 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: 853
04-09-2015, 09:10 PM
36. ### 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: 557
04-09-2015, 01:51 PM
37. ### 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: 497
04-08-2015, 09:43 PM
38. ### 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: 614
04-08-2015, 04:41 AM
39. ### 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: 909
04-07-2015, 07:03 PM
40. ### 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: 512
04-07-2015, 05:00 PM
41. ### 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: 667
04-07-2015, 11:57 AM
42. ### 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: 785
04-07-2015, 11:16 AM
43. ### Regression analysis

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

• Replies: 6
• Views: 1,005
04-06-2015, 12:39 PM
44. ### 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: 527
04-06-2015, 07:11 AM
45. ### 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: 636
04-05-2015, 01:24 PM
46. ### 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: 523
04-05-2015, 07:53 AM
47. ### 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: 432
04-02-2015, 11:14 AM
48. ### 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: 502
04-02-2015, 03:23 AM
49. ### 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: 996
04-01-2015, 09:10 AM
50. ### 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: 394
03-31-2015, 08:38 PM

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