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# Forum: Regression Analysis

Linear regression, linear models, nonlinear regression

1. ### Dummy variable question in regression

Hello, I'm trying to understand dummy variables in regression. I'm regressing the price of diamonds against (1) weight (2) Clarity and (3)...

• Replies: 2
• Views: 2,083
04-26-2012, 11:26 AM
2. ### Creating an indicator variable of a single observation

Hello, Could somebody explain the rational for creating a dummy variable for a single observation in a regression analysis. Why would you do it? ...

• Replies: 0
• Views: 1,876
04-29-2012, 06:26 AM
3. ### Interpreting regression output

Hi there, I have performed a linear regression of the energy consumption of an electric car on 7 measured parameters. They are 1. Max...

• Replies: 0
• Views: 1,060
08-06-2012, 05:15 AM
4. ### Are my residuals normal?

Hi there, I have performed a multiple regression analysis and am checking the assumptions. The normal probability plot is not exactly a straight...

• Replies: 9
• Views: 2,199
09-05-2012, 06:17 PM
5. ### Multicollinearity and the 'backward' regression method

Hello, I have a question about multicollinearity and multiple regression. If you were to use the 'backward' selection method of regression...

• Replies: 0
• Views: 2,403
09-06-2012, 09:04 AM
6. ### Least significant variable regression

Hello, Could somebody tell me what is the least significant variable in this regression analysis? What do you look for? Many thanks

• Replies: 3
• Views: 2,713
09-06-2012, 02:54 PM
7. ### Sample size multiple linear regression

Hi, Would anybody know of a method or a respectable online calculator for calculating the sample size for a multiple linear regression (being...

• Replies: 1
• Views: 1,670
09-15-2012, 11:30 PM
8. ### Multiple regression, predictors normally distributed?

Hi, I have a basic question, in multiple regression do the predictors variables have to be normally distributed or is it just the residuals...

• Replies: 1
• Views: 1,243
09-13-2012, 08:49 AM
9. ### Multicollinearity and the 'backward' regression method

Hello, Simple question - Am I right is assuming that you cannot use backwards,forwards or best subsets regression techniques if you have two...

• Replies: 6
• Views: 2,732
09-26-2012, 12:22 PM
10. ### 4PL Non-Linear Regression, Transforming observed y values

Good Afternoon, I'm currently teaching my self how to fit response curves, and have run into some trouble. I currently need assistance on...

• Replies: 7
• Views: 4,942
10-22-2013, 12:33 PM
11. ### multivariate optimazion question

Hi all, I need to solve a optimization problem like this min||XW-YV||_{F}^{2}, that's to minimize the Frobenius norm. X and Y have the same...

• Replies: 0
• Views: 1,730
09-01-2010, 02:25 PM
12. ### Regression on Composite Rates

I have what may be a simple question, but I have been unable to find an appropriate methodology, and I am hoping that one of you may be able to help....

• Replies: 0
• Views: 2,478
02-22-2012, 06:26 PM
13. ### 95% Intervals

I'm new here (and relatively new to statistics) so I apologize if this thread is in the wrong place. I have a problem that seems relatively easy...

• Replies: 4
• Views: 2,223
02-09-2012, 11:31 PM
14. ### Logistic regression logit or cloglog?

Hi folks,:wave: currently I'm performing a logistic regression and I'm not sure which link function I should use. I have a binary response...

• Replies: 3
• Views: 18,019
12-03-2012, 01:37 PM
15. ### How many IVs can I use?

I am hoping to publish the results of this in a journal (not a statistics one, an experimental science one). I have a sample size of 71...

• Replies: 2
• Views: 2,998
11-11-2009, 04:08 PM
16. ### Manually calculating weights for WLS

*Posted in Stat Consulting but moved here b/c I think it's more fitting. Hi guys, I'm trying to figure out how to manually calculate the...

• Replies: 0
• Views: 4,407
01-13-2010, 03:21 PM
17. ### Elasticity with negative predictors

Hello All: I am trying to determine elasticity of demand using relative price position (my price minus competitors price) as the predictor. I know...

• Replies: 2
• Views: 1,960
06-04-2012, 02:00 PM
18. ### calculating adjusted rsquared by hand

Hi. I just wanted to make sure I am doing these calculations correctly. I have 8 models, one with no variables. So to get the adjusted rsquared, I...

• Replies: 1
• Views: 8,104
10-30-2013, 11:59 AM
19. ### linear regression Johnson Transformation

If two predictor variables transformed by the Johnson Transformation (see Minitab or Johnson 1949) are used in separate linear regressions (assuming...

• Replies: 1
• Views: 3,354
01-02-2013, 10:59 AM
20. ### statistical tool/program for obtaining stiffness properties by force-deflection data

I am performing flexural testing of composite honeycomb sandwich panels as per D7250,desired deliverables(stiffness values G,U and D) are obtained...

• Replies: 0
• Views: 1,384
03-01-2015, 11:42 AM
21. ### Understanding Mixed Effects Regression Models

Can anyone explain to me the difference between mean effect and change when using a mixed effects regression model? I understand mean effect to be...

• Replies: 0
• Views: 594
04-26-2017, 03:34 AM
22. ### So many variables--how to approach this?

I'm working on a project about depression as a possible side effect of a particular medication. The people who take this drug also tend to have...

• Replies: 9
• Views: 4,125
08-11-2010, 05:24 PM
23. ### Sum of the squared least squared residual

Hey guys! This is my first post on this booming forum! I came across a problem that asks "Find the Sum of the squared least squared residual"...

• Replies: 0
• Views: 1,419
09-16-2013, 09:50 AM
24. ### Regression or LSD for discrete quantitative factor?

I have a 2-factor factorial experiment where Factor A is quantitative and continuous with 2 levels (100 and 200). Factor B is quantitative, but...

• Replies: 0
• Views: 2,928
12-28-2009, 12:55 PM
25. ### beta = r, so can beta be greater than 1.0?

I have a basic question, but it's been a long time since I learned regression. I'm having trouble reconciling these three facts: (1) In a...

• Replies: 13
• Views: 4,129
11-14-2013, 01:15 AM
26. ### How to estimate change effects through time using R?

Hi I am using project R and I have two sets of datas: 1. House prices, house info (eg. sqft, rooms, lot sizes, etc), area codes, and school...

• Replies: 1
• Views: 3,192
12-05-2010, 06:45 PM
27. ### Interaction Term in Logistic Regression

I'm reading Kutner, et al., Applied Linear Statistical Models (5th), and came across something I don't recall the authors explaining. I vaguely...

• Replies: 8
• Views: 8,920
06-17-2011, 05:10 PM
28. ### ANCOVA and geography help

For a GIS class project, I'm doing some research based on Christopher Rumh's 2000 paper Are Recessions Good for your Health? In it, he analyzes...

• Replies: 1
• Views: 2,364
11-03-2011, 03:09 AM
29. ### To Classify Or Not -- Does it make sense to use income brackets?

At my job we're doing an analysis of energy usage for low income households as part of our subsidy program. Some 90,000 households are in this...

• Replies: 13
• Views: 3,208
09-11-2012, 10:10 AM
30. ### Adding main effects when main effects model is insignificant

Hi, I have a linear model where both main effects are insignificant, and an overall insignificant model. Should I stop just stop there, or can I...

• Replies: 1
• Views: 912
11-05-2015, 07:31 PM
31. ### Sparse Logistic regression

What method should be used when the proportions of 1's in a logistic regression problem is very low. (lets say 0.04%)???? Normal logistic method...

• Replies: 2
• Views: 2,730
01-13-2011, 08:01 AM
32. ### Interpreting Odds Ratio after Weight of evidence transformation

I am doing a logistic modeling with several continuous variables and binary outcome variable. 1- event 0-non event. I did the initial modeling with...

• Replies: 2
• Views: 1,118
05-03-2016, 10:16 AM

Suppose that you wish to use a linear regression to predict the dependent variable Y using the dependent variable X1. You collect a scatter plot of...

• Replies: 0
• Views: 1,946
06-03-2009, 06:06 PM
34. ### should I specify or let GLM estimate the ancillary parameter?

Hi, I am using GLM negative binomial regression to examine a positively skewed dv. Under Type of Model, there is a subsection of the menu where...

• Replies: 0
• Views: 1,633
01-20-2014, 06:13 AM
35. ### Negative Binomial Reg - why changes in significance using one less/similar variables?

Hi, I am running a NBR on a sample of 500 participants to predict survival rate from a set of health indices eg. diagnosed diabetic, history of...

• Replies: 0
• Views: 932
01-07-2014, 06:46 AM
36. ### I think this is a simple question but I can't seem to find it in my stats book

I have a linear regression equation (y=6.0707x-1200.2) that was used to develop 50 point estimates. The sum of these estimates is the point estimate...

• Replies: 12
• Views: 3,168
01-20-2017, 02:29 PM
37. ### [SOLVED] model coefficients

I need a little help with the output of this model. Below is the output of a linear model of log river flow over time: ...

• Replies: 4
• Views: 1,492
04-03-2014, 10:27 PM
38. ### Linear regression analysis - Urgent assistance required

Hi I am trying to examine the relation between ad. liking and attitude towards the brand. My hypothesis H1: "Commercials that are liked will...

• Replies: 6
• Views: 4,810
10-11-2009, 04:10 AM
39. ### Dissertation help with Likert scale

Hello, I'm having some problems with the stats for my dissertation. My dissertation is about the effect of the physical surroundings of a...

• Replies: 9
• Views: 11,498
04-16-2008, 01:27 PM
40. ### multi group SEM regression coefficient/t-value interpretation

Hello, I have a small interpretation issue. A chi-square difference test between unconstrained vs constrained multi group sem indicated...

• Replies: 1
• Views: 2,603
07-10-2012, 06:58 AM
41. ### Finding predicted values with logged (ln) dependent variable.

Hello all, I'm currently working on my first quantitative project. I am doing an OLS regression in SPSS. I had to take the natural log of my DV in...

• Replies: 4
• Views: 3,718
01-23-2017, 11:16 AM
42. ### 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: 894
03-31-2015, 07:38 PM
43. ### Multiple regression least square estimation

Can someone show me the equations and the derivation of the least square estimation of multiple linear regression? It would be even greater if...

• Replies: 0
• Views: 3,749
05-20-2006, 11:44 AM
44. ### Regression analysis research project help.

Hi, I have a project i have to do for my regression analysis course. Basically I need to gather a bunch of data and plot it and find a regression...

• Replies: 1
• Views: 6,693
10-12-2010, 01:07 PM
45. ### Need some help with multiple regression

Hi guys. For my project i need to to a regression with a bunch of data I've gathered. I have 7 variables and i did the regression in excel and got...

• Replies: 4
• Views: 2,163
c2q
11-03-2010, 03:28 AM
46. ### Regression in excel - Is this possible?

Hi guys. Okay for my regression project, I have all my data and my Y value is based on 7 variables (i.e. Y = b0 +b1x1 +...+ b7x7) Now i have...

• Replies: 5
• Views: 4,310
12-11-2010, 01:59 PM
47. ### Excel's t stat question.

Hi guys, I'm a little confused over this right now. I performed a regression in excel and as an example, this is what i got for my first...

• Replies: 3
• Views: 5,099
11-23-2010, 06:49 PM
48. ### Data for regression analysis

I am helping a friend with a project involving regression analysis. First off he wants to know if there is a way to determine if the extracted data...

• Replies: 4
• Views: 2,362
c2q
05-07-2011, 11:53 AM
49. ### Simple regression question

Hi. I know most of my basic regression stuff but I forgot one thing. I conducted a regression with 4 independent variables and from my regression...

• Replies: 5
• Views: 2,578
06-15-2011, 08:06 AM
50. ### Orthogonal projection onto linear span.

Hi there. I was hoping someone could give me a starting point on this problem because I'm clueless. given y = x1 =

• Replies: 3
• Views: 3,601
BGM
10-24-2011, 12:55 PM
51. ### Orthogonal projection in regression analysis.

Can someone explain what exactly you are trying to find when using orthogonal projection in regression analysis. I don't quite understand it. You are...

• Replies: 0
• Views: 1,778
c2q
11-04-2011, 10:29 PM
52. ### What Regression Analysis Should I Employ

Hi, I would really appreciate some help with this. I am looking to see if employees' organisational history (such as voluntary/involuntary turnover)...

• Replies: 4
• Views: 1,370
01-25-2014, 05:17 AM
53. ### Logistic Regression: model selection and interpretation

Good Day!! Hi I am working for the first time with logistic regressions and I have some doubts about the model selection and the result that is...

• Replies: 3
• Views: 5,374
11-16-2011, 03:17 PM
54. ### Problem with small amount of cases

Hi New here, and fairly new with statistics. I have a problem with too few cases, but more than enough variables and observations. I have no...

• Replies: 5
• Views: 2,443
Cai
08-19-2009, 12:09 PM
55. ### SQReg demonstration

Hello everyone, i need help with this demonstration: SQReg = B1^2*Sxx Someone can help?

• Replies: 1
• Views: 1,467
06-06-2016, 12:22 PM
56. ### OLS with dummy and few observations (12 mean values from 2.5k observations)

Hi all :) Maybe you can help me with a problem I have in using OLS regression: I have a dataset of 12 markets, in total ~2.5k trades happened...

• Replies: 1
• Views: 1,467
12-04-2014, 09:17 AM
57. ### 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: 2,478
02-07-2013, 01:23 PM

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