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# Forum: Regression Analysis

Linear regression, linear models, nonlinear regression

1. ### Replication in linear regression. General Estimating Equations (GEE) a good option?

or is it the only option? I've been collecting hosts in 3 different habitats, about 20 hosts every sampling trip. I've been recording prevalence...

• Replies: 3
• Views: 2,355
06-04-2015, 01:03 PM
2. ### Ordered Probit Model

I am using the ordered probit model in my regression, and I have some questions. 1. What are the basic assumptions? 2. which tests should be run?...

• Replies: 0
• Views: 1,607
06-03-2015, 07:29 PM
3. ### Interpretation of Cross validation (in Logistic Regression) results

Hello! I am faced again with Logistic Regression, and in particular binary LR, in a study that I am faced with trying to assess the impact of some...

• Replies: 0
• Views: 2,568
06-03-2015, 01:53 AM
4. ### Comparing coefficients in Logistic Regression

Hello ! I would like to have guidance on what follows. I was fitting a Logistic Regression model, and I got the coefficients for the model's...

• Replies: 14
• Views: 9,607
06-02-2015, 09:08 AM
5. ### Getting VIF from R

Hello! I was wondering how to get the VIF value for predictors in R (namely, in the context of Logistic Regression). I have read that there is a...

• Replies: 1
• Views: 2,782
06-02-2015, 08:38 AM
6. ### Find the Most Important Variables In Predictive Models

Hi, I have a target variable Y, and twenty predictors (input variables) X1,X2,...,X20. I can predict Y by its predictors X1,X2,...,X20....

• Replies: 1
• Views: 1,283
06-02-2015, 07:16 AM
7. ### Ordinal vs Multinomial

I am interested why predicted probabilities for ordinal and multinomial regressions differ? Can we explain this difference in terms of multinomial...

• Replies: 0
• Views: 1,200
05-31-2015, 05:25 PM
8. ### step wise regression and bootstrap method

anyone able to help me with an article i am critiquing? I wanted to do mediation model and I think the authors have used incorrect method but not...

• Replies: 1
• Views: 1,255
05-31-2015, 05:53 AM
9. ### Logistic Regression as Data Transform?

Hello everyone, new here, glad to be here! I have what might be an unorthodox question. I use the matlab function 'mnrfit' ...

• Replies: 1
• Views: 1,521
hcc
05-30-2015, 10:18 PM
10. ### Help with running two level binary logistic regression model

Hello everyone, It is my first time when I am performing quantitative research. My master thesis is about determining specialist level and...

• Replies: 1
• Views: 1,233
05-28-2015, 11:12 AM
11. ### Including cross-sectional variables in panel data analysis -- can I do that?

Hello dear forum members, I have a panel data set with a count outcome variable. As far as I understand, Yit is conditional on Xit in panel...

• Replies: 3
• Views: 1,274
05-27-2015, 02:26 PM
12. ### Is logistic regression appropriate for this study?

A study that compares 3 different categorical outcomes

• Replies: 1
• Views: 1,299
05-27-2015, 12:00 AM
13. ### Comando para correlacion contemporanea (modelo efectos aleatorios

Buenas noches compañeros, busco un comando para el software stata 13.1, para poder estimar la correlacion contemporanea, para el modelo de efectos...

• Replies: 2
• Views: 1,772
05-26-2015, 09:14 AM
14. ### Reporting logistic regression results

Hi, I have a study that aims to find out the association of a binary outcome (e.g. BP control-Y/N) with categorical independent variables e.g....

• Replies: 3
• Views: 2,941
05-25-2015, 10:29 PM
15. ### Significant effect disappears when separate analyses are conducted

Dear all I have conducted an experiment in which subjects concurrently perform two tasks. Task A stays always the same, while Task B has two...

• Replies: 0
• Views: 1,186
05-21-2015, 10:14 PM
16. ### Errors on fit parameters with no errors on data

Hi all Many, maybe all, statistical packages I know of (R, matlab, root, sas) will allow you to fit data with no associated errors, and give you...

• Replies: 0
• Views: 1,740
05-20-2015, 11:38 PM
17. ### Estimate of Variance

How does one obtain the best estimate of the variance of observations around the fitted model in SPSS? My thinking is that the best estimate of...

• Replies: 0
• Views: 1,619
05-19-2015, 06:36 PM
18. ### Hell Please. Linear Regression Model

Which of the following is NOT assumed to contribute to uncertainty in predicting y from x in a standard Model I linear regression. a. Uncertainty...

• Replies: 8
• Views: 1,838
05-19-2015, 09:42 AM
19. ### Residual variance of OLS regression from R-Squared?

Can residual variance of OLS regression be derived from R-Squared, and if so, how?

• Replies: 2
• Views: 1,906
05-17-2015, 11:51 AM
20. ### logistic regression for customer data

Hey guys, i'm supposed to build a logistic model, but i'm not quite sure how to begin. i have two data sets. One for the customers( all...

• Replies: 0
• Views: 1,164
05-16-2015, 09:16 AM
21. ### New with Stata - Changes in Beta event study question

Hello, I am trying to do an event study regarding beta and check if beta changes after stock splits dates. I am planning on checking if the...

• Replies: 0
• Views: 1,487
05-14-2015, 06:16 PM
22. ### Paired/Matched Sample with Hierarchical Moderated Regression Question

Hello Everyone, I would greatly appreciate some help with this question. I am trying to help a good friend with her dissertation and am now...

• Replies: 0
• Views: 1,255
05-14-2015, 05:14 PM
23. ### Time series regression with blocks of years?

I am evaluating the impact of policy changes over time. There are three separate time periods, each representing a number of years, and I want to see...

• Replies: 3
• Views: 2,430
05-14-2015, 03:29 PM
24. ### GLS regression STATA

Hi, is there a command in Stata that allows for GLS regression without panel data? or am I missing something? Thanks

• Replies: 0
• Views: 2,870
05-13-2015, 06:00 PM
25. ### Nested data structure

Hi, I wonder whether the community can help. The goal is to run a series of regressions with correctly estimated standard errors. Note that the...

• Replies: 0
• Views: 1,534
dnh
05-13-2015, 05:59 AM
26. ### Regression with averaged data

I have data that represents the average for a group, which I would like to use for my response variable. I have different variables that are...

• Replies: 0
• Views: 1,989
05-12-2015, 08:24 PM
27. ### Logistic regression and significance of continuous variables across 3 periods

I'm currently working on a logistic regression analysis in R with a binary response variable (0 = non-used; 1 = used location). I am modeling...

• Replies: 3
• Views: 1,791
05-12-2015, 12:22 PM
28. ### Multiple Regression - Is it possible to constrain the coefficients to be positive?

Another stumper ... I am running a multiple regression with two independent variables. The regression results look good, except that one coefficient...

• Replies: 6
• Views: 2,148
05-11-2015, 07:26 PM
29. ### Linear regression on a weighted moving average

Hi, I was hoping to get some advice. I want to run a forecast using linear regression but wanted to account for any potential cyclic variations in...

• Replies: 0
• Views: 1,377
05-11-2015, 04:52 PM
30. ### 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: 2,810
05-11-2015, 04:31 PM
31. ### 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: 1,579
05-10-2015, 08:55 PM
32. ### 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: 1,751
05-09-2015, 03:56 PM
33. ### 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: 1,995
05-08-2015, 05:01 PM
34. ### 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: 1,677
05-08-2015, 09:06 AM
35. ### 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: 1,126
05-08-2015, 05:03 AM
36. ### 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: 1,590
05-07-2015, 09:46 PM
37. ### 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: 2,473
05-06-2015, 03:30 PM
38. ### 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: 4,256
05-06-2015, 10:11 AM
39. ### [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: 4,942
05-06-2015, 08:42 AM
40. ### 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: 1,483
05-05-2015, 10:13 PM
41. ### 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: 1,144
05-04-2015, 04:39 PM
42. ### 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: 1,715
05-04-2015, 11:25 AM
43. ### 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: 1,194
05-01-2015, 06:57 PM
44. ### 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: 1,635
04-30-2015, 10:05 PM
45. ### 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: 994
04-30-2015, 10:32 AM
46. ### 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: 1,586
04-30-2015, 07:51 AM
47. ### 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: 1,645
04-30-2015, 02:37 AM
48. ### 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: 5,044
04-29-2015, 09:08 AM
49. ### 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: 2,287
04-28-2015, 01:31 PM
50. ### 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: 3,077
04-28-2015, 11:13 AM
51. ### 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: 1,693
jle
04-28-2015, 01:58 AM
52. ### 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: 1,268
04-25-2015, 07:15 PM

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