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# Forum: Regression Analysis

Linear regression, linear models, nonlinear regression

1. ### Should we remove non significant 1st order effects when interaction is significant

My question is simple: When you have a multiple regression equation which is: Y = a0 + a1.X1 + a2.X2 + a12.X1X2 is it correct to remove...

• Replies: 4
• Views: 6,845
08-20-2012, 10:02 AM
2. ### Extremely large Odds Ratios?!

Hi, I've conducted a binary logistic regression with 1 independent variable (Type of property: flat/maisnette, terraced, semi-detached, detached and...

• Replies: 4
• Views: 12,182
12-13-2012, 10:19 AM
3. ### Explain the nonsignificance of simple slope analysis (with significant interaction)?

Hi everyone, I need some help. In a study, I tested an interaction hypothesis and got a significant interaction result (p < .05) and visual...

• Replies: 4
• Views: 4,577
08-07-2013, 03:42 PM
4. ### Criterion for outliers

Hi, I have a simple question, what's the best way to report the criterion you used to identify outliers? I used casewise diagnostics, outliers...

• Replies: 4
• Views: 3,123
02-22-2013, 03:34 AM
5. ### ANOVA/MANOVA for a complex data matrix

Hi friends, I've got a data matrix with 140 rows and 5 columns. Each row represents a unique characteristic of the 5 different plant species. Idea...

• Replies: 4
• Views: 2,081
08-21-2013, 02:20 AM
6. ### Comparing regression slope intercepts in SPSS

Hello, my name is Robert Hall and I have got myself in a bit of a pickle with my 3rd year research project. For my project I am looking at the...

• Replies: 4
• Views: 16,053
Jac
07-09-2012, 11:39 AM
7. ### Interpreting Multiple Regression vs Correlation

Hi, I'm analysing the results to a satisfaction survey. I want to work out the key drivers of satisfaction so I'm using a question relating to...

• Replies: 4
• Views: 5,177
05-28-2012, 05:58 AM
8. ### Simple question regarding the OLS procedure...

If I understand this equation correctly, if the transpose of x_i is an n by 2 matrix, then is the matrix x_i a 2 by n matrix? But isn't that a weird...

• Replies: 4
• Views: 1,740
06-06-2012, 11:43 AM
9. ### Best analysis to use.

Hi - I am new to using Stats and wanted to know if regression would work in the below scenario. I have two sets of hotel occupancy rates by...

• Replies: 4
• Views: 1,989
06-25-2012, 08:03 PM
10. ### What are the weaknesses of bootstrapping OLS standard errors?

What are the weaknesses of bootstrapping OLS standard errors using residuals and pairs bootstrapping methodology? I've seen many sources on this...

• Replies: 4
• Views: 3,726
08-02-2012, 10:46 AM
11. ### Problem with forecasting/data transformation

Hi, I am looking to forecast ticket sales (the distribution is U shaped with big tails, i.e. a lot of sales happens during the first few days and...

• Replies: 4
• Views: 1,709
07-13-2012, 08:06 AM
12. ### Multiple regression- kurtosis in DV

Hey all, This may be a really stupid question. But I'm really stupid when it comes to statistics, so bear with me! My dependent variable has...

• Replies: 4
• Views: 2,446
07-23-2012, 09:44 PM
13. ### Logistic Regression Question

Hi everyone, I have just found this forum (via google) and I wish I had known about it earlier, it seems great! My knowledge of statistics is sadly...

• Replies: 4
• Views: 1,454
07-21-2012, 04:49 PM
14. ### dummy variables

Hello everyone, Regarding my regression model i have several missing observations regarding one of my independent variable, in this case Research...

• Replies: 4
• Views: 3,154
07-27-2012, 06:49 AM
15. ### What does this mean?

I ran a regression. One independent variable. One dependent variable. After I finished I got an r-squared of 0.85. Now suppose I do the following...

• Replies: 4
• Views: 2,251
07-31-2012, 03:03 PM
16. ### Make predictions with standardized coefficients

Hello, I've been struggling with a problem since a while, hopefully someone here could help me out. The problem: I want to use the...

• Replies: 4
• Views: 3,358
08-21-2012, 08:05 PM
17. ### Logistic Regression or Chi Square?

Hi everyone, I am a stats noob and am currently doing my fourth year thesis, examining moral development in children and adolescents. My design so...

• Replies: 4
• Views: 12,272
09-03-2012, 08:34 AM
18. ### Regression Analysis Based on Condition

Hi there, I am trying to do a regression analysis. My columns looks like this: AA 1 GG 2 AG 2 If the column 2 contains "2" so...

• Replies: 4
• Views: 2,336
09-02-2012, 11:59 PM
19. ### number of hours worked squared

Hello, My dependent variable is logged annual income. One of my independent variables is experience squared (the number of hours worked per...

• Replies: 4
• Views: 1,507
09-13-2012, 01:08 AM
20. ### How to define partial support

I have 6 statistical tests which make up one hypothesis - one is significant, can I say that the hypotheses has partial support?

• Replies: 4
• Views: 2,350
09-22-2012, 10:33 AM
21. ### Why is there perfect multicollinearity in this regression?

Hi Everybody, I will simplify my problem to make this all more clear. Suppose I have three countries (1, 2 and 3) and I have data on migration...

• Replies: 4
• Views: 2,846
10-03-2012, 05:02 PM
22. ### Issue with missing data

Hi all, I am working on a dataset that include 12K+ firm-level data for 30+ countries. I have both firm-level variables (each firm within country...

• Replies: 4
• Views: 1,909
10-16-2012, 05:55 AM
23. ### Correcting lack of fit

I have a very simple data set with a single regressor that has all negative values. The data set provides no context, only values. When testing...

• Replies: 4
• Views: 2,039
10-21-2012, 02:01 PM
24. ### Zero-inflated continuous independent variables

Are there ways of handling zero-inflated continuous independent variables?

• Replies: 4
• Views: 6,052
11-01-2012, 10:44 AM
25. ### Skewed dependent variable in logistic regression-how to handle

I am conducting research on juvenile firesetting with a child's self report of firesetting as my dependent variable.(0= never played with or set...

• Replies: 4
• Views: 6,638
11-08-2012, 07:18 PM
26. ### SPSS- logistic regression, three patient groups, ROC curve

Hi all, I have three groups of patients, and 6 variables for each patient. I want to combine these variables and make a multiclass ROC curve, in...

• Replies: 4
• Views: 10,875
11-11-2012, 09:54 AM
27. ### multiple regression categorical variable and different slopes

Hi All, I’m trying to run multiple regression with 2 independent variables and one categorical variable (two levels: male vs. female). The...

• Replies: 4
• Views: 2,045
11-30-2012, 05:13 AM
28. ### how do i do this final project =(

1) Sale prices of apartments. The data is saved in the SALES file. A Minneapolis, Minnesota, real estate appraiser used regression analysis to...

• Replies: 4
• Views: 2,808
12-10-2012, 04:47 PM
29. ### what test should be used to tell if two regression lines are significantly different

I have two lines in a x-y plot 1. observed migration distance (y) and predicted migration distance (x) (Y=0.95X+0.31, the slope coefficient and the...

• Replies: 4
• Views: 3,397
04-29-2013, 02:26 PM
30. ### finding the autocovariance function for exp(x)

I want to find the autocovariance function of y(t) = exp(x(t) which is a nonlinear time series. When I try to find the autocovariance function I...

• Replies: 4
• Views: 2,656
01-16-2013, 05:44 PM
31. ### How to analyze data with more than one associated categorical dependent variables?

I have some dependent variables related to the growth of a company having categories like (e.g. for variables indicating net profit, financial...

• Replies: 4
• Views: 2,334
04-26-2013, 10:56 AM
32. ### Find standard error of mean

Suppose you have a process x_{t} = \mu +w_{t} -0.8*w_{t-1} where w_{t} ~ wn(0,\sigma_{w}^2). How do I calculate the standard error of var(\bar{x})...

• Replies: 4
• Views: 1,667
01-24-2013, 07:47 PM
33. ### how to get a 'main effect' from dummy coded variables?

Hello everyone! Thank-you for all the responses I got for my previous thread. I think I am now able to work on something. I have a question, however,...

• Replies: 4
• Views: 1,692
01-22-2013, 05:10 PM
34. ### Logistic regression

Hello I just ran a logistic regression on some data I have. The response is binary (0/1) and the independent variable is categorical with 3...

• Replies: 4
• Views: 2,114
12-30-2012, 07:55 PM
35. ### Quality of regression

Hey, i made a linear regression between two datasets of the form y=mx+b. I calculated m and b with a formula that is typical for this data. But...

• Replies: 4
• Views: 1,746
01-10-2013, 04:04 AM
36. ### Multiple Linear Regression

Hi Folks, I have completed all the analysis for my dissertation, which looks at the relationship between phonologica errors made by 5 - 11 year...

• Replies: 4
• Views: 2,093
02-13-2013, 02:38 PM
37. ### Trouble with GLMs (Using R)!

Greetings! I've been trying to analyse some data for a while now, and I have found what I think the best model for my GLM is. However, I have friends...

• Replies: 4
• Views: 1,542
01-02-2013, 04:52 PM
38. ### Logistic Regression - Equation

Hi! I run a logistic regression, and i know that it can be written as Pr(y=1)=F(a+b_1*x+b_2*z). With y being the dependent variable, a the...

• Replies: 4
• Views: 1,997
01-28-2013, 02:02 AM
39. ### I need ideas for building a "customer-centric" model

I'm just starting down this path so forgive me for being vague and maybe not even asking the right questions. The goal: I would like to build a...

• Replies: 4
• Views: 3,032
02-19-2013, 02:46 PM
40. ### Dichotomized predictor with dichotomized response

I have a dichotomized predictor which can be 0 or 1 and it predicts correctly roughly 80% of the time if a patient is cured 1 or not 0. I tried...

• Replies: 4
• Views: 1,875
01-29-2013, 12:50 PM
41. ### Probit/Logit independent variables

Hello, My DV is a binary variable (Yes/No) and I am using a logit/probit regression analysis. As for my independent variables,there are three...

• Replies: 4
• Views: 1,590
04-23-2013, 11:29 PM
42. ### Searching for analysis that would compare two trends of data

Hello, glad to be here. I am looking for an appropriate statistical analysis to address a problem similar to the one described below: Lets say I...

• Replies: 4
• Views: 5,428
03-01-2013, 03:15 AM
43. ### Multiple Linear Regression: Outlier

Ok folks, so I am doing a multiple linear regression. I am not a statistics expert by any means, and it is part of a psychology report. The last time...

• Replies: 4
• Views: 2,413
03-07-2013, 02:16 PM
44. ### Alternatives to logistic regression when the number of cases is low

Hi All I got involved in my first foray into logistic regression, but have come to realize that I probably can't use it. Let me tell you about my...

• Replies: 4
• Views: 2,209
03-27-2013, 08:43 AM
45. ### Non normal residuals and heteroskedasticity

I’m running a multiple regression model with 5 predictors (n >1000). Looking at the output the model fits the data well and the predictors behave as...

• Replies: 4
• Views: 1,318
05-09-2013, 11:02 AM
46. ### Interaction, moderaton and regression

I am facing a problem with my analysis. I have two dichotomous moderators between two continuous IV (violation perception) and DV (anger) variables....

• Replies: 4
• Views: 1,474
06-28-2013, 12:34 PM
47. ### Multi-Factors model - Linear regression on Market Size

Dear all, I'm working on a multi factors model analysis to come up with a formula to estimate market size of some countries based on several...

• Replies: 4
• Views: 3,425
05-22-2013, 12:46 PM
48. ### Strange Wald Chi Square Value

I ran a logistic regression model with 46 IV and 405 usable cases (and yes I know that is a lot of IV but for what I was doing it was required). In...

• Replies: 4
• Views: 1,717
05-21-2013, 04:04 PM
49. ### Logistic Regression

Helo I am faced with a problem which looks to be a clear case of logistic regression. A dependent variable(binary in nature) needs to be...

• Replies: 4
• Views: 2,200
06-10-2013, 12:14 PM
50. ### Predict race outcome off expert predictions of outcome

Hi, I'm new to this forum and found a late 2011 discussion of the relevance of regression analysis of rank outcome interesting. I have used...

• Replies: 4
• Views: 1,829
06-12-2013, 03:05 PM
51. ### My Moderator is Group= can I still standardise it??

Please help!! I am trying to do moderated regression after failed attempts at MANOVAs, and am having an issue with my moderator variable... I...

• Replies: 4
• Views: 1,408
08-10-2013, 10:36 AM
52. ### Time series regression books

Hi, I am interested in Time series regression and I would like to find 1-2 good books that explain Time series with examples using SAS. Does...

• Replies: 4
• Views: 4,547
08-21-2013, 09:37 AM
53. ### Preprocessing Variables before Regression

I have variables x1,x2,x3 and result y. I have a problem that multiple tuples of variables are matched with a single y. For example x1 x2 x3 ...

• Replies: 4
• Views: 1,875
08-24-2013, 12:11 PM
54. ### negative binomial regression coefficients and exp(b)

Thank you so much anyone... I have the results of a negative binomial where the DV is the log count of meals obtained. I have continuous predictors...

• Replies: 4
• Views: 5,197
08-27-2013, 09:28 AM

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