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# Forum: Regression Analysis

Linear regression, linear models, nonlinear regression

1. ### 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: 5,406
03-01-2013, 03:15 AM
2. ### (SPSS) Multinomial Logistic Regression- testing IIA- Hausman-McFadden

hi all, I am using SPSS 20 to analyze survey data. I am using Multinomial Logistic Regression and have come up with three "models", containing...

• Replies: 2
• Views: 7,736
Syd
02-28-2013, 09:08 PM
3. ### change sign estimate manually because of underlying theory

*****the thread should be: change sign observations variablebecause of underlying theory****** (sorry for the mistakes in the previous version of...

• Replies: 0
• Views: 1,629
02-27-2013, 04:31 PM
4. ### Principal component analysis problem

Hi, My question is about Principal component analysis(PCA). Suppose we have five variables X1,X2,X3,X4 and X5 (all are correlated). We find five PCA...

• Replies: 1
• Views: 1,520
02-25-2013, 02:49 PM
5. ### mean squares

SS(Res) = 215.61 D.f. = 2 MS(Res) = 107.81 What does MS(Res) exactly represent and implicate?

• Replies: 2
• Views: 2,086
02-24-2013, 02:45 PM
6. ### goodness of fit test for nonlinear, nonmonotonic data.

I have a dataset which I believe can be modelled by a sinusoidal regression with increaing mean (in time series). I have performed spectral...

• Replies: 0
• Views: 2,344
02-24-2013, 11:48 AM
7. ### Non significant constant in cubic polynomial regression

Hi, When examining the confidence intervals for my constant in a cubic regression analysis I noticed that they include the value of 0 and...

• Replies: 1
• Views: 1,894
02-23-2013, 10:44 PM
8. ### Four level dependent variable.

I have a four level dependent variable which is at least ordinal (its likert scale) and may be interval (that is the distance between each level may...

• Replies: 1
• Views: 1,744
02-23-2013, 10:43 PM
9. ### Is there a residual plot for logit regression?

Hello All, I know one can view a residual plot with OLS, and the plot will show if there is a pattern or not from the residuals. Is there...

• Replies: 0
• Views: 1,929
02-23-2013, 07:39 PM
10. ### elimination of 0-values in multiple regression

hi there ... i am running a multiple regression analysis to where the independant variables are various types of food consumed, and the dependent...

• Replies: 0
• Views: 1,633
02-23-2013, 11:24 AM
11. ### Confident intervals not so confident at all... what went wrong?

I'm doing a linear regression analysis with 3 predictors and 76 cases. So far, everything is going smooth. R^2 = 0.95. So, I let SPSS calculate...

• Replies: 3
• Views: 2,449
02-22-2013, 04:48 PM
12. ### Ordinal logit assumptions

I am working with a four-level ordinal dependent variable (i.e., never, once-twice, several times, very often). I have been running generalized...

• Replies: 0
• Views: 1,903
02-22-2013, 12:12 PM
13. ### project data points to straight line

I have a lot of data from seismic experiment.I need to project points from crooked line to straight line,classical least squares estimates does not...

• Replies: 1
• Views: 2,077
02-22-2013, 12:03 PM
14. ### Logistic Regression: To dummy code or not to? Which backward elimination to use?

I have 10 binary dependent variables (disease prevalence: yes/no, 1/0). I want to do a logistical regression with each of them with the following...

• Replies: 5
• Views: 16,392
02-22-2013, 11:13 AM
15. ### Non Linear Regression: Overlay scatterplot of results

Hi, I wonder if anyone could give me some guidance as to how to create an overlay scatterplot that will demonstrate which of three regression...

• Replies: 1
• Views: 2,337
02-22-2013, 10:51 AM
16. ### 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: 3,108
02-22-2013, 03:34 AM
17. ### Two-level regression and weights

Hi, I'm trying analyze a two-level binary logistic (level-1=individuals and level-2=states) regression model with the PEW Religious Landscape...

• Replies: 0
• Views: 1,863
02-21-2013, 03:52 PM
18. ### Model to predict new points

Can anyone help me build a model which can predict a set of new (x,y) point given existing points. The data represents intended touch points which...

• Replies: 0
• Views: 1,764
02-21-2013, 12:24 PM
19. ### regression with binary predictors and continuous outcome

Hi all, I performed a principal coordinate anaysis on a distance matrix from binary (presence - absence expressed as 1 and 0) variables. Now, I'm...

• Replies: 0
• Views: 1,814
02-21-2013, 06:15 AM
20. ### binary independent and binary dependent variables

Hi all, Is it possible to run a regression with binary independent variables and binary dependent variables. i.e 0 & 1 value ind variables and 0...

• Replies: 8
• Views: 3,563
02-21-2013, 12:44 AM
21. ### How to find accuracy between forcasted and Actual value..

Hi... I have monthly actual and forecasted data. I have to see accuracy between them. In this case, which statistical method is applicable to see...

• Replies: 1
• Views: 1,880
02-20-2013, 08:25 PM
22. ### "Adjusting" logistic regression model

I'm trying to predict response to a direct mail campaign, but there will be multiple campaigns, each having a different "topic" (eg, home remodeling,...

• Replies: 2
• Views: 2,744
02-20-2013, 06:43 PM
23. ### Building separate logistic regression models

Hi all, I am building a binary logistic regression model. I am not sure if using the variables as interactions is a better choice than building...

• Replies: 2
• Views: 2,561
02-20-2013, 06:14 PM
24. ### Repeated measures regression

Hi, I have data from an experiment with a continuous dependt variable and two dicotomous independent variable. All measures are repeated within...

• Replies: 0
• Views: 1,531
02-20-2013, 03:43 PM
25. ### 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: 3,016
02-19-2013, 02:46 PM
26. ### Effect Coding: p-value of reference category

Hi, I fit a regression model with effect coded variables. I'm well aware of how to compute the value for the reference category but I have...

• Replies: 2
• Views: 4,232
02-19-2013, 03:38 AM
27. ### Dependent variable is on a four point scale

I have a dependent variable on a four point satisfaction scale. It is clearly at least ordinal in nature, it may be interval although we are not...

• Replies: 0
• Views: 2,395
02-18-2013, 10:59 AM
28. ### More than 2 categorical variable+1 continuous variable as independent variable

I am a civil engineering student and have no relation with statistics. Now I am working on my master thesis and I have got to work on SPSS now, which...

• Replies: 2
• Views: 4,729
02-18-2013, 10:21 AM
29. ### Standardized Regression Equation

Hello, I'm trying to figure out something I'm sure it is a simple answer to many people here. I standardized my X and Y variables and I...

• Replies: 1
• Views: 2,058
02-18-2013, 07:32 AM
30. ### Cook's distance for nonlinear regression

Cook's distance was used to detect outliers in a linear regression model. But is it ok to use it with non-linear regression model?

• Replies: 0
• Views: 3,496
02-17-2013, 06:58 PM
31. ### Fitting confidence interval lines in R using the predict function

Hi everyone, I am currently attempting to fit confidence interval lines to a regression model in R, but every time I try to for example add a +2...

• Replies: 0
• Views: 2,435
02-17-2013, 05:33 AM
32. ### Testing heteroskedasticity of error variance

Hello, I'm trying to test the heteroskedasticity of the error variance by using BP test and Non-constant variance score test. However, I get very...

• Replies: 0
• Views: 2,680
02-16-2013, 01:18 AM
33. ### Segmenting a Logistic Regression Model

Hi All, I am trying to build a Logistic Regression model . In my model i have 4 different variables( with 3 levels each) on which i am trying to...

• Replies: 0
• Views: 1,488
02-15-2013, 06:32 PM
34. ### Regression Analysis and Hypothesis Testing

Can someone please help me out with these questions. Thanks guys. Yhat = 227.3642 + 6.4075Xt Σ (Xt - Xbar)^2 = ΣXt^2 ≈33.43 σˆ2≈35.4198 Xbar =...

• Replies: 12
• Views: 3,956
02-15-2013, 03:46 PM
35. ### Reducing Number of Categorical Variables

I have an abundant amount of categorical variables pertaining to an epidemiological study. I need to filter these down to a succinct list and wish to...

• Replies: 1
• Views: 2,360
02-14-2013, 04:30 PM
36. ### Generating correlated predictors data and dependent data in r

Dear all, I need correlated both predictors data and dependent data in r. My problem is given as follows. We adopt a p=4 parameter model and...

• Replies: 2
• Views: 1,658
02-14-2013, 01:04 PM
37. ### 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: 2,083
02-13-2013, 02:38 PM
38. ### Logistic regression failed to converge

For one of my data sets the model failed to converge. I am sure this is because I have to few data points for logistic regression (only 90 with about...

• Replies: 3
• Views: 4,515
02-12-2013, 09:16 PM
39. ### OLS regression with dummy dependent AND independent vars

Disregarding whether probit / logit should be used - I just want to verbally interpret results from an OLS regression where my dependent variable y...

• Replies: 6
• Views: 2,884
02-12-2013, 09:15 PM
40. ### Interpetation of Ordinal Logistic regression parameter

I am using effect coding and have a question on the interpetation of a p value for individual parameters of a categorical predictor (which SAS breaks...

• Replies: 8
• Views: 2,471
02-12-2013, 05:07 PM
41. ### Multiple Regression interpretation

y=β0+β1x1+β2x2+β3x3 Price = year + (difference between actual miles and average miles, x-xbar) + (year * difference between actual miles and average...

• Replies: 1
• Views: 1,795
02-12-2013, 11:27 AM
42. ### Controlling for group differences of no interest - regression, ANCOVA, neiter?

Have been hunting around for a while and thought I ask here: Using SPSS, I have a continuous interval DV (test performace) and one four-level...

• Replies: 1
• Views: 1,776
02-11-2013, 04:09 PM
43. ### Multinomial Regression - predicting probabilities

Hi, I have responses to a questionnaire on patient experience. My aim is to add a component of this questionnaire (on communication) to an...

• Replies: 1
• Views: 1,759
02-11-2013, 10:27 AM
44. ### Untrue Panel Data and Logistic Regression

Hi all, For full disclosure, I am not particularly well trained when it comes to statistics or econometrics but I am familiar with the basics. ...

• Replies: 3
• Views: 2,294
02-10-2013, 08:55 PM
45. ### Comparing ln(y) =bX vs. OLS and other count data models

My data is a balanced panel. 12 years X 600 ids/year X 12 months = 864,000 observations. For about 150 of my 600 ids, at a certain point in this...

• Replies: 0
• Views: 3,155
02-08-2013, 08:17 PM
46. ### Multicollinearity in Time Series Data

Hello all, this is my first post here -- hoping to find some helpful advice, and hope to dispense some in the future. Here is my situation: I am...

• Replies: 2
• Views: 4,753
02-08-2013, 01:44 PM
47. ### Interpretation of odds ratio in logistic regression for a logged variable

Hello, How do we interpret the odds ratio in logistic regression for a logged variable? Thanks in advance.

• Replies: 6
• Views: 3,114
02-08-2013, 08:43 AM
48. ### What form of regression to use

I have four level DV. It is ordinal and the distances between each level may be the same (I am not sure). My inclination is to use some form of...

• Replies: 3
• Views: 1,915
02-07-2013, 05:30 PM
49. ### Combining panel (10 years of data) and survey data (1 year) in one regression

Quick question regarding a problem I am having: My research explores determinants of municipal recycling behavior, evaluating the effects of...

• Replies: 0
• Views: 2,501
02-07-2013, 01:23 PM
50. ### Multiple Regression: real-world example

Everyone in my Advanced Stats class is completely stuck on this assignment, I don't know where else to turn... Using the paper/article "Predictors...

• Replies: 3
• Views: 9,491
02-07-2013, 01:07 PM
51. ### query regarding generalized linear models

hello all, I have a query regarding GZLMs. I have a variable A non-normally distributed and I also take the logA, which is normally distributed to...

• Replies: 2
• Views: 1,706
02-07-2013, 12:22 PM
52. ### Motion and rotation analysis (two positions on a rigid body to calculate rotation)

Hello all, I'm currently a undergrad university student doing research and I'm anaylising some position data. The data is a time-series' of...

• Replies: 0
• Views: 1,126
gge
02-07-2013, 07:14 AM
53. ### stuck in SPSS with multiple non-linear regression

Hello everyone. So, I've been stuck for several days with an assignment. I was asked to compare 2 models for a relationship between 2 variables....

• Replies: 0
• Views: 3,084
02-06-2013, 07:22 AM
54. ### Fixed Effects or Random Effects for finding determinants of expenditure

Hi! I am doing a paper on the determinants of healthcare expenditure for the elderly. I have panel data for income and expenditure for a period of 10...

• Replies: 2
• Views: 1,185
02-06-2013, 05:59 AM
55. ### Estimating the error term variance without fitting a regression line

There's a question in my regression class I'm having trouble with. We are basically given 6 points (5,y1), (5,y2), (10,y3), (10, y4), (15,y5),...

• Replies: 2
• Views: 2,845
02-05-2013, 09:12 PM
56. ### Linear regression of complex survey data using proc surveyreg, normality??

Hi, I'm trying to do a linear multivariate model of a continuous outcome (minutes per week of physical activity). The data I'm using was collected...

• Replies: 0
• Views: 914
02-05-2013, 05:28 PM
57. ### Normality assumption for Regression

I have an outcome variable that is composed of one item on a 3 point scale to assess participation (none-1, member of 1 program-2, member of both...

• Replies: 6
• Views: 2,083
02-05-2013, 04:04 PM

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