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# Forum: Regression Analysis

Linear regression, linear models, nonlinear regression

1. ### Does fitting of a regression line as such contribute to mass significance?

Is the fitting of a regression line (least squares, for a given number of predictors) as such to be regarded a statistical test that can contribute...

• Replies: 0
• Views: 1,612
03-06-2012, 05:04 AM
2. ### using utilities of different attribute levels (from conjoint analysis) in regression?

In short, I am trying to measure factors influencing an intention-to-purchase a product, with use of a regression. However, some of my constructs...

• Replies: 1
• Views: 2,393
07-27-2011, 05:29 PM
3. ### Chi Square and Regression

Hi all, First time post so please go easy on me :p I have a bunch of categorical variables that I am thinking of using as predictor variables...

• Replies: 3
• Views: 1,807
03-30-2016, 12:18 PM
4. ### Proof

Hello! I've read a textbook with the following expression. "y = beta 0 + beta 1 * lnx + u" and it claimed that end up: delta y = beta 1 * ((delta...

• Replies: 1
• Views: 2,034
08-08-2016, 09:31 AM
5. ### Multiple regression: one of my significant factors has outliers, what should I do?

So I ran a multiple regression and found two factors that explained one of my dependent variables quite well. The problem is that one of the two...

• Replies: 2
• Views: 2,015
03-22-2015, 07:29 AM
6. ### Compare slopes of multiple regression models - repeated measures at mult conditions

In an experiment I measured how hard (torque, dependent variable) subjects could push against a plate as it rotated at 4 speeds: stopped, slow,...

• Replies: 3
• Views: 2,576
08-09-2013, 12:52 PM
7. ### 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: 1,996
06-25-2012, 08:03 PM
8. ### Trying to think of alternative methods to approaching my model for dynamic pricing

Right now i run a pricing experiment where 25%of users get one of 4 random prices. After collecting sufficient data, I split my data into training...

• Replies: 0
• Views: 2,212
12-16-2016, 10:37 AM
9. ### GEE prediction interval... Help?

Ok, so I'm a bit stuck here... I used a GEE model, with 2 groups (group as factor) within each group subjects walk at two different walking speeds....

• Replies: 0
• Views: 2,460
01-30-2011, 03:33 PM
10. ### suppressor variables

I have built a multiple linear regression model with two independent variables (say X1 and X2). The primary aim is *not* to use the model for...

• Replies: 0
• Views: 2,399
11-17-2010, 05:58 AM
11. ### Industry-Year regressions - excluding observations - need advice

Hello, I am trying to run firm-year specific regressions in SAS to get to an expected value for industry-year. However, I need to exclude the i'th...

• Replies: 0
• Views: 2,355
05-12-2011, 08:47 AM
12. ### Scaling variables in regression

If you need to scale variables in order to get the correct effect size and beta weight for each variable, does this mean you also scale for both...

• Replies: 3
• Views: 2,714
09-24-2014, 03:30 PM
13. ### Violation of linearity assumptions - binary logistic regression - what to do?

I am running a binary logistic regression with SPSS and unfortunately the assumption of linearity (Box-Tidwell procedure) are not met for the...

• Replies: 10
• Views: 2,457
05-26-2016, 01:46 PM
14. ### Interpret Transformed Independent Variables

Dear Forum, I ran a logistic regression and one of my Independent variables was transformed with a LG10. I know from normal non transformed...

• Replies: 1
• Views: 737
06-12-2016, 12:15 PM
15. ### Advice on Regression Model Using PROC GLM in SAS

Hi Everyone, thanks for your insight on this. I will try to explain my data set as well as possible. One of the models I am running on my data...

• Replies: 0
• Views: 1,071
02-21-2014, 08:39 PM
16. ### 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: 4,810
04-29-2015, 09:08 AM
17. ### Durbin-Watson

Hi, Do I need to run a Durbin-Watson test if I am finding regressions for the number of second-language words learnt in a week based on age in...

• Replies: 2
• Views: 1,864
10-16-2015, 04:18 PM
18. ### multiple regression help

Hi guys, I was reading the following example from a book, but couldn't understand a couple of things. Could you help me out here? Here is the...

• Replies: 1
• Views: 2,304
01-22-2010, 02:50 PM
19. ### Multiple Linear Regression: Transformation, testing of normality, heteroscedasticity

Hello everyone, I have a question that might be a basic one, but still I want to reassure myself that I am not on the wrong path by hearing the...

• Replies: 6
• Views: 4,921
06-28-2012, 09:18 AM
20. ### Box-Tidwell procedure

Hello everyone, Is there a possibility to perform Box-Tidwell procedure in SPSS, or any other convenient software? Thanks.

• Replies: 0
• Views: 5,616
06-28-2012, 04:38 PM
21. ### Regression on coordinates

Hello everyone, I plan to include coordinates as covariates in the regression equation in order to adjust for the spatial trend that exists in the...

• Replies: 0
• Views: 2,356
07-04-2012, 08:01 PM
22. ### Pros & Cons of a pooled model versus a non pooled one

Dear All, so this is what I mean, so I am looking at determinants of learning achievements of children. Cool. So now I would like to understand...

• Replies: 8
• Views: 3,205
04-16-2013, 11:45 AM
23. ### Dealing with endogenous independent variables (Car Industry Project)

I am running a regression on vehicle demand (vehicle registrations in 2011) with the following independent variables: Assembly location Price...

• Replies: 0
• Views: 1,192
04-12-2013, 01:27 PM
24. ### Independent variables: 1 to 5 star rating

Hello, I'm having a little difficulty specifying two independent variables; Customer Score and Expert Score. The reviews are each assigned 1 to...

• Replies: 5
• Views: 2,656
04-25-2013, 12:11 AM
25. ### Percentage change of dependent variable (MLR)

Greetings, I went through SPSS regression analysis of a certain dataset, tested assumptions, and finally I got a multiple regression model:...

• Replies: 3
• Views: 6,413
12-21-2015, 03:34 PM
26. ### Need HELP!... building a multible linear regression model

Dear all, i am not sure which variables and model I should choose for the following question, which is part 7 of a research, since I think almost all...

• Replies: 0
• Views: 2,094
04-16-2010, 08:36 AM
27. ### Using Bonferonni in Multiple Regression

Hi all, I'm currently working on a data-set involving several continuous independent variables and i'm wondering how the Bonferonni correction can...

• Replies: 1
• Views: 930
05-09-2016, 05:37 AM
28. ### Fixed effects estimation: how many dummy variables can be included in model

Dear community, For my Bachelor-Thesis I have to assess the link between a firm's connectedness and success. For this purpose I was given data...

• Replies: 1
• Views: 1,647
03-30-2014, 03:55 AM
29. ### compare regression effects nested models

Dear forum, The following problem is puzzling me for a while. Suppose I have two nested models, where y is the same dependent variable and x1 is...

• Replies: 4
• Views: 1,858
05-29-2014, 12:50 PM
30. ### probit vs biprobit

Its probably just a simple understanding question. Say i have two endogenous binary variables y1 and y2 and I think they are somehow correlated....

• Replies: 0
• Views: 1,315
12-24-2013, 10:54 AM
31. ### Calculating prediction intervals (error estimates of specific predicted points) in a

Hi all, this is my first post here so please let me know if I need to provide more details. I want to generate a multivariate logistic regression...

• Replies: 6
• Views: 14,036
06-22-2010, 01:01 AM
32. ### Bootstrapping confidence intervals for prediction based on SE of the coefficients?

Is it remotely legitimate to use the standard errors of the coefficients from linear regression in a Monte Carlo simulation to bootstrap 2.5%/97.5%...

• Replies: 0
• Views: 1,576
10-15-2011, 08:35 PM
33. ### Logistic regression, but no negative responses?

So I am trying to model who is likely, from a list of addresses, to go to a store. I have lots of criteria about the people who have visited my...

• Replies: 5
• Views: 1,341
08-12-2014, 10:38 AM
34. ### Panel Data Regression (xtreg) STATA

Hello everyone, I'm running a pooled tiem series regression with random effects. It runs fine and I'm having a problem interpreting results. I'm a...

• Replies: 0
• Views: 6,354
09-15-2011, 09:24 PM
35. ### coefficient standardization

Hi All, I am working on a 2nd order regression. The span of coefficient is large (say 1:10000). So the coefficients of 2nd order are very big and...

• Replies: 0
• Views: 994
04-10-2014, 04:03 PM
36. ### range of tuning parameters

Hi All, I have just started my advanced statistics study. And here is one thing I have not been able to understand for long time -- how can we...

• Replies: 6
• Views: 2,666
10-01-2014, 07:09 PM
37. ### Binary IV and ordinal DV, suggestions for a model?

Hi guys! Just started at a new company having graduated this year, theyve got me analysing data and producing some key driver analytics. Thing is,...

• Replies: 4
• Views: 2,791
10-01-2014, 03:57 AM
38. ### Understanding ordinal regression

Hi! This is a really simple question, but one for which the answer continues to elude me! I understand that in a binary logit regression the...

• Replies: 0
• Views: 1,930
10-01-2014, 11:08 AM
39. ### Regression: Multiple Independent Variables by Year

Hello All! First time here and working in SPSS. I'm having a difficult time running a regression using test score proficiency as my dependent...

• Replies: 1
• Views: 760
06-07-2017, 02:33 PM
40. ### Coefficient of determination interpretation

Hey guys, this my first post in here so hello everyone:) I have a question regarding the coefficient of determination. Wikipedia says: An...

• Replies: 4
• Views: 2,085
09-17-2014, 04:58 PM
41. ### beginner's specification problems

Hi, I am doing an assignment on unemployment (DV) and racial discrimination - specifically african-american population - and I am in doubt whether to...

• Replies: 0
• Views: 1,078
06-04-2014, 01:24 PM
42. ### Did i get theese right i am confused, can anyone help me please

25. In multiple regression analysis, residual analysis is used to test the requirement that A) the variation in the residuals is the same for all...

• Replies: 2
• Views: 21,386
11-30-2008, 09:08 PM
43. ### Can you guys check these for me

Shade answers to T/F questions and type letter answer to multiple choice questions next to problem number. Chapters 13 & 14 included. T F 1. If a...

• Replies: 1
• Views: 5,695
12-08-2008, 03:33 PM
44. ### Multiple Regression - Interpreting t-stat

Hi all, If the model fit is satisfactory (ie. R-squared value is sufficiently high), how should the t-stat be interpreted... my reading indicated...

• Replies: 1
• Views: 105,205
08-29-2006, 01:56 PM
45. ### Analytical solution to correlation between two linear combinations of values

Greetings, Suppose I have two linear combinations of values as follows: Y1 = B11*X1 + B12*X2 + B13*X3 Y2 = B21*X1 + B22*X2 + B23*X3 where...

• Replies: 3
• Views: 1,756
09-12-2014, 02:00 PM
46. ### 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: 1,762
05-17-2015, 11:51 AM
47. ### Testing the equality of the Residual Sum of Squares of two linear models

I have two models of a dependent variable: Y = a1 + b1X1 and Y = a2 + b2X2 The variances around the lines of least error are important...

• Replies: 2
• Views: 987
10-22-2015, 09:19 AM
48. ### Advice on OLS analysis

Hello Everyone, I’m writing a paper on the relationship between weather on daily public bike share system usage. I’m looking for a bit of advice...

• Replies: 0
• Views: 1,905
12-14-2016, 12:59 PM
49. ### ANOVA - Does Welch's test assume homogeneity of variances, or not?

In other words, will it return a much smaller standard error when variance are unequal than Fisher's? Or is it not concerned with variance?

• Replies: 3
• Views: 2,542
12-28-2016, 09:46 PM
50. ### mutliple interactions in same equation

Hi Folks, I am reviewing a manuscript that uses four interactions in the same equation, and i am wondering if authors need to include higher order...

• Replies: 0
• Views: 1,064
01-02-2013, 03:53 PM
51. ### Std deviation of correlation coefficient?

Hi I've run a VAR model to find the correlation coefficient between two stock markets. Now I need to find the standard deviation of this...

• Replies: 1
• Views: 2,965
07-27-2011, 07:29 PM
52. ### Help with Regression Equation

Hi, Basically I need help working out all the variables for a multiple regression equation. The equation used is: Y= X1 R1 + X2 R2 +....Xn Rn +...

• Replies: 2
• Views: 3,751
04-27-2010, 10:49 AM
53. ### 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: 1,554
04-30-2015, 02:37 AM
54. ### Mediation analysis - Preacher & Hayes - could someone check what I've done please?

I'm new to mediation analysis and have had a go with a simple model. I'd be thrilled if someone could have a look at this and let me know any issues...

• Replies: 0
• Views: 3,108
06-21-2013, 03:06 AM
55. ### Should I use regression or logit

Hi Guys, I need to find out the influence of factors affecting female labour force participation. I thought to take female labour force...

• Replies: 2
• Views: 1,751
11-12-2013, 08:18 AM
56. ### Model conception

Hello! I have a basic stats question: I want to model a phenomenon, and estimate parameters. How many observations would I need, to be as...

• Replies: 0
• Views: 864
09-01-2016, 04:44 AM

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