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# Forum: Regression Analysis

Linear regression, linear models, nonlinear regression

1. ### how to prove COV(y bar, estimated beta1) in linear regression equals 0

Yi=Xi*beta1 + beta0 + error Prove: COV(average of Yi, estimated beta1) = 0 Thanks!

• Replies: 24
• Views: 44,063
09-10-2015, 12:27 AM
2. ### Least Squares

• Replies: 8
• Views: 3,478
09-09-2015, 06:21 PM
3. ### control for confounding variables using logistic regression

Hello... I'm in a project to investigate the prevalence of intrusive thoughts in patients diagnosed with major depressive disorder and non-clinical...

• Replies: 6
• Views: 1,975
09-08-2015, 03:39 PM
4. ### Help with multiple dummy variable regression.

I am attempting to forecast claim denials, whether it will ultimately be adjusted off or not. I am running all the data through excel. The...

• Replies: 0
• Views: 831
09-08-2015, 12:51 PM
5. ### Is this a case for Mixed Model Anova?

HI, My study has 2 IV's each with two levels (2 hull designs and 2 techniques) = 4 conditions, and has 3 subjects. Max acceleration data was...

• Replies: 0
• Views: 1,208
09-06-2015, 12:12 PM
6. ### Logistic regression- choosing sample

Hi, I am writing my dissertation and will use a binary outcome variable (decision of a country to sanction other states or not). I was planning to...

• Replies: 0
• Views: 1,266
09-06-2015, 10:41 AM
7. ### Linear regression: Prais-winsten method in SPSS with confidence intervals

Hello Any help greatly appreciated.... I've conducted a linear regression but as the data is autocorrelated (Durbin Watson = 0.5) I wanted to...

• Replies: 0
• Views: 2,381
09-06-2015, 07:07 AM
8. ### How do I compare the strength of relationships across three groups (in SPSS)?

Hi everyone, I have data from three countries (US, Spain, and Germany), and ran a separate mediation analysis for each one using four variables:...

• Replies: 0
• Views: 1,180
09-03-2015, 01:59 PM
9. ### Dealing with multicollinearity

I have a following model: y=a+b1x1+b2x2+b3x1x2+b4x3+other terms \$ Let's say, I am only interested in coefficient b3. The magnitude of coefficient...

• Replies: 4
• Views: 1,871
09-03-2015, 10:19 AM
10. ### Error from calculation of X from Y response in linear regression

Hello, I have what I am pretty sure is a simple problem that I can't get a hold on and could use some help! I am sampling air and using a gas...

• Replies: 1
• Views: 1,092
09-03-2015, 09:19 AM
11. ### Correlation for a sample with constant dependent variable

Hello everyone, I hope I got the right subforum! I would really appreciate if someone takes the time to help me and guide me into th right...

• Replies: 0
• Views: 1,567
09-03-2015, 09:11 AM
12. ### Key driver analysis on customer satisfaction (CSAT)

I have following data from a survey: 1) Customer satisfaction scores (scale 0-10) 2) Indication of which 3 service aspects respondents give...

• Replies: 0
• Views: 3,389
09-03-2015, 02:33 AM
13. ### help required urgent

A sample of 12 homes sold last month in Minot is selected. Can we conclude that as the size of the home (in square footage) increases, the selling...

• Replies: 9
• Views: 2,778
09-02-2015, 08:15 AM
14. ### Regression - What to do with insignificant variables?

Please pardon me if you find this question very silly but this doubt has been troubling me for some time now whenever I want to run a regression. ...

• Replies: 2
• Views: 3,106
09-02-2015, 02:30 AM
15. ### Multinomial Logistic Regression - Interaction Effect

Hello there, I would appreciate it very much if someone could help. In my study, participants saw a picture of a man or woman either with or...

• Replies: 2
• Views: 1,404
09-01-2015, 05:46 PM
16. ### Website Visits and Marketing Spend and their correlation with Sales

Hello, My company wants to find a correlation between website visits and marketing spend between sales. Essentially, are website visits or spend a...

• Replies: 0
• Views: 1,474
08-28-2015, 07:11 PM
17. ### Help with multiple regression and spark/spss

Hello, I am trying to create a program in spark that will run a multiple regression for my master's dissertation. I am using the standard formula...

• Replies: 0
• Views: 1,174
08-28-2015, 03:24 AM
18. ### Regression w/ dummy variables

I'm looking to conduct regression analysis using three dummy variables for independent variables: (1) ethnicity, (2) GLOBE category (i.e. country of...

• Replies: 0
• Views: 1,849
08-27-2015, 09:26 PM
19. ### Regression analysis for the influence one result has on the results of another test

Hi There, My name is Jordan and I’m a physiotherapist working in London. I have taken over study from a colleague and have been given the data...

• Replies: 0
• Views: 731
08-27-2015, 08:15 AM
20. ### Mediation Analysis With Longitudinal/Multilevel Data

Hi All, I'm trying to determine if it's possible to conduct mediation analysis on three-level data. I have data with repeated measures at five...

• Replies: 0
• Views: 3,030
08-26-2015, 09:05 PM
21. ### Setting an experiment with ordered categories as predictors

I am trying to apply a multi-factorial regression analyses on a model with 4 different predictors each of which can have four different weights as...

• Replies: 1
• Views: 1,287
08-26-2015, 03:52 PM
22. ### Is GLM to best for my data

Hello I want to look at abundance of fleas on their hosts, so there are zero counts. I have looked and found that GLM with family = poisson and...

• Replies: 2
• Views: 1,768
08-26-2015, 01:48 PM
23. ### Regressional on likert scale data using spss

Hi guys, I am in a fix!!:confused:. My questionnaires have recently been filled but am yet to figure out how to analyze my data. My topic is "impact...

• Replies: 2
• Views: 8,944
08-26-2015, 08:56 AM
24. ### Alternative for a multi-level analysis

Hi all, For my criminology thesis I am analysing police interviews and would like to research the effect (the presence of) an attorney has on...

• Replies: 1
• Views: 1,621
08-25-2015, 10:13 AM
25. ### Interpreting my regression results

Hi all, i'm running a panel regression using stata. i wanted to test whether there are indeed region fixed effects (FE) that reside in my data...

• Replies: 0
• Views: 1,096
08-23-2015, 04:05 PM
26. ### Multiple Regression: 3 levels in IV of interest, how to compare between all 3?

Hi all, I would like to test the following and am hoping to get some assistance as I am new to regression: DV - Brain volume IV - Participant...

• Replies: 0
• Views: 1,107
08-22-2015, 11:52 PM
27. ### Hierarchical regression for a complex model

So I am testing my own model but it is more complex than I have dealt with before. I know I need hierarchical regression, and I'm using SPSS (I have...

• Replies: 0
• Views: 900
08-21-2015, 03:45 PM
28. ### Regression to the mean for discrete non normal data

Hello At work an initiative was started that attempted to reduce the number of Emergency department attendances by frequent users. I have a set...

• Replies: 1
• Views: 1,454
08-21-2015, 02:09 PM
29. ### Logistic Regression

Hello, I'm currently working on a churn modelling exercise that uses logistic regression. The challenge that i'm facing now is that the model is...

• Replies: 2
• Views: 1,233
08-21-2015, 04:11 AM
30. ### Variation of Gauss - Markov theorem

Hi all, I was wondering what happens to the proof and the results of the Gauss - Markov theorem, if one hypothesis is changed and so if the...

• Replies: 0
• Views: 1,101
08-19-2015, 10:13 AM
31. ### Logistic Regression

Hello I am going to start building a Logistic Regression model based on medical data for the purpose of classification. My problem started with...

• Replies: 4
• Views: 2,395
08-16-2015, 01:37 PM
32. ### Confounder

What if I see a 10% change (decrease) in an variable effect (X1 on Y) when including another variable (X2), though the effect of X1 is never remotely...

• Replies: 3
• Views: 1,599
08-16-2015, 11:16 AM
33. ### Can I draw an interaction plot using Generalised Estimating Equations (GEE)?

Hello, Can I draw an interaction plot using Generalised Estimating Equations (GEE)? If yes, how? Thanks.

• Replies: 0
• Views: 601
08-16-2015, 09:42 AM
34. ### Difference-in-difference regression

Hello, I have a problem with my current research project and I am not very experienced with statistics so it would be great to find some help...

• Replies: 0
• Views: 1,328
ERa
08-16-2015, 01:46 AM
35. ### Best way to code a variable in a hierarchical (multi-level) regression?

The outcome is binary, and I have individual-level data and geographical-level data. It's the latter I need help with. Here's the best example:...

• Replies: 1
• Views: 1,340
08-13-2015, 09:54 PM
36. ### Which model would you choose?

Dear readers, I am struggeling with the model selection (ICs are very different and many insignificant models). Which model would you choose, and...

• Replies: 1
• Views: 1,286
08-12-2015, 06:35 AM
37. ### How to handle missing values in lm.fit?

Is there a way to use lm.fit without completely removing rows with missing data using R? Is there a way for lm.fit to leave out one piece of...

• Replies: 1
• Views: 3,477
08-10-2015, 03:33 PM
38. ### Help with regression model

Hi, I am trying to understand whether there are any problems with a regression model I'm using for research. I'm interested in the effect of...

• Replies: 0
• Views: 938
08-10-2015, 10:11 AM
39. ### Polynomial Regression

Is there anyway to get this formula in the polar opposite where X = Expression? I am hoping to get this so that I can use it to help do a...

• Replies: 0
• Views: 1,582
08-06-2015, 10:42 PM
40. ### Comparing linear regression models: a chi-squared test to compare adjusted R-squares?

Hi all, I used linear regression to analyze the data of one of my experiments, and used 3 predictors in a first model, added 4 more predictors in...

• Replies: 1
• Views: 1,424
08-06-2015, 03:04 AM
41. ### p-value of a coefficient from a regression

The t-stat value follows a two-tail symmetric t-distribution with mean and median of zero? Am I correct so far? If so, then how can you get a...

• Replies: 9
• Views: 2,336
08-04-2015, 04:54 PM
42. ### Probit Regression

Hİ all. Hope everyone is great. I just want to ask a question. What are the assumptions of probit regression? Can you offer me a book about probit...

• Replies: 1
• Views: 1,346
08-04-2015, 03:39 AM
43. ### Impact of heteroscedasticity and non-normality on utility of regression result?

Hello: I am using least squares 2nd order polynomial regression to determine the effect of a single independent variable (X) on a dependent...

• Replies: 0
• Views: 1,156
08-01-2015, 07:45 PM
44. ### What if you are not interested in a variable that has been found to matter in the lit

The article I am working for stresses the importance of a variable that my organization has no interest in at all. It is an important control, should...

• Replies: 4
• Views: 2,053
08-01-2015, 03:28 AM
45. ### SPSS Logistic Regression Predicts Too Many Negatives?

Hello everybody, I have a logistic regression model, where the outcome Yes is coded as 1, No as 0. The split between Yes and No is about 30/70...

• Replies: 6
• Views: 1,760
08-01-2015, 02:28 AM
46. ### New to hierarchical regression, looking for advice

Hey all, I am relatively experienced in plain old OLS and I'm trying to learn how to do mixed-effects, hierarchical modeling. I got Andrew...

• Replies: 0
• Views: 1,106
07-31-2015, 06:57 PM
47. ### What is "mixed-effects OLS regression"

It is mentioned on p 14 of the link below. I have never heard of it before... ...

• Replies: 3
• Views: 2,275
07-31-2015, 06:21 PM
48. ### Linear Reg (Press Statistic)

I was not familiar with the Press Statistic. I am currently looking it up. Seems to be a leave-one-out procedure. Can any one provide some...

• Replies: 2
• Views: 1,652
07-30-2015, 08:06 AM
49. ### Relationship between 2 variables & 1 dependant

Hi all, My wife is busy with an assignment that is even giving me grey hair. She needs to determine the relationships between 2 variables and 1...

• Replies: 7
• Views: 1,758
07-30-2015, 07:45 AM
50. ### Moderating effects in structural equation models

Hello, first, I want to apologize if I'm opening this thread in the wrong folder etc. I just registered here and I'm a bit confused still. I'm...

• Replies: 0
• Views: 1,079
PSH
07-30-2015, 03:37 AM
51. ### Linear Regression with effect size changes of categorical variables with continuous

I have three categorical variables (disked, herbicide, Lands) each is binomial (0,1). For example, within disked there is a group in which it does...

• Replies: 3
• Views: 1,745
07-27-2015, 02:21 PM
52. ### Multiple mediation analysis

I have a question about multiple mediation analysis. I had originally designed a study to see if four separate variables (M1, M2, M3 and M4) mediate...

• Replies: 5
• Views: 1,622
07-27-2015, 08:32 AM
53. ### Ordinal predictor variable in regression

When you have a nominal categorical predictor you just create dummies. With say a five level ordinal predictor (the classical case would be a likert...

• Replies: 1
• Views: 1,530
07-26-2015, 05:51 PM

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