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# Forum: Regression Analysis

Linear regression, linear models, nonlinear regression

1. ### i cant understand this question :|

Hi everyone , i had small problem with this question i don't know what Sxx Syy Sxy and C.I mean? i wanna find the roles to follow but i couldn't ...

• Replies: 1
• Views: 3,187
01-20-2011, 12:04 PM
2. ### Confidence limits for logistic regression equation

I have generated a logistic model for a disease status Y (unaffected-affected) using several independent variables on a very large (600K+) dataset. I...

• Replies: 0
• Views: 3,185
03-21-2013, 11:29 PM
3. ### I want to learn to create ARX, ARMAX, Box-Jenkins and Output-Error

Hello. I'm am a control engineer and I want to upgrade my skills in simulation of dynamic physical systems. Normaly I describe my physical system...

• Replies: 8
• Views: 3,185
01-07-2017, 12:43 PM
4. ### correlation of trends?

Hi, I have extracted trends from two time series (one correspond to some climate parameters, the other one to chemical composition of tree...

• Replies: 1
• Views: 3,182
07-27-2014, 04:11 PM
5. ### Interpreting results: repeated measures logistic regression

I am into some new territory with repeated measures logistic regression. The hypothesis for this study is that treatment will make more less...

• Replies: 7
• Views: 3,177
06-02-2012, 09:24 PM
6. ### Writing R^2 strictly in terms of simple correlations among variables

Say we have the following regression Y_i=\beta_0+\beta_1X_{1i}+\beta_2X_{2i}+\epsilon_i I want to write the multiple R^2 for this regression...

• Replies: 8
• Views: 3,175
02-07-2015, 07:06 PM
7. ### Improving an estimate of a mean value

Hello, I have a dataset that has 10 independent descriptors and one dependent statistic, b. Only a few of the descriptors are quantitative and...

• Replies: 3
• Views: 3,169
02-28-2006, 11:35 PM
8. ### Logistic regression

Good afternoon, I write to you for 3 questions. Thanks for your help. When in a regression analysis the correct model is unknown before the...

• Replies: 6
• Views: 3,169
03-22-2014, 02:04 PM
9. ### 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: 3,169
09-03-2015, 02:33 AM

Hi all, for my master thesis I would like to investigate the human impact on behavior of sea lions. I have 3 different defined response variables...

• Replies: 10
• Views: 3,166
11-22-2011, 02:03 PM
11. ### Struggling to interpret a result of standard multiple regression

Hi there, I am studying 4th year statistics in psychology. I am doing an assignment which required me to form composite variables from a large...

• Replies: 2
• Views: 3,163
04-25-2010, 10:13 PM
12. ### questions on logistics modeling

While studying logistic modeling, I read the following statement I do not know what do the "case-control" and "cross-sectional studies"...

• Replies: 1
• Views: 3,163
02-08-2011, 06:00 PM
13. ### Simple Question Seasonal Autoregressive Model

Hi, I hope I'm posting this in an appropriate place. It's not exactly linear regression. If you have a seasonal moving average model like...

• Replies: 10
• Views: 3,163
01-11-2012, 02:27 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: 3,160
07-27-2012, 06:49 AM
15. ### [age] discrete variable or continuous variable in linear regression?

Hi i need some help. I hope you can guide me. I have a survey and i need to predict the variable e18. The issue is i'm not sure how to treat the...

• Replies: 4
• Views: 3,160
04-24-2014, 12:51 PM
16. ### Question: Sample size and regression

I have a question regarding sample size and regression. First, the following is a general overview of my study: Purpose of Study: To examine the...

• Replies: 0
• Views: 3,159
07-14-2011, 10:20 PM
17. ### Standard error of the conditional mean

Hi, Will somebody please show me how to derive the formula to compute the standard error of the conditional mean in multiple linear regression? ...

• Replies: 0
• Views: 3,156
04-05-2010, 09:34 AM
18. ### question about panel data and interaction terms

Hi everyone, I'll try to keep this simple I am using 4 waves of panel data from a national longitudinal survey I'm trying to predict my...

• Replies: 1
• Views: 3,156
07-25-2013, 04:58 PM
19. ### Assumptions for adding indicator variable

Hi, can you please tell me the assumptions that are needed to be satisfied before adding indicator variables? I have searched on internet but I...

• Replies: 2
• Views: 3,152
04-27-2011, 03:07 PM
20. ### non-significant predictor became significant after including additional predictor?

Hi everyone, I have a quick question concerning a program I am having in multiple regression. I have a working full mediation model, that is,...

• Replies: 10
• Views: 3,150
01-05-2015, 09:37 PM
21. ### 1way anova to do multiple comparisons on dichotomous dv

Greetings! I wanted to quickly reference with someone who may know more about logistic type analyses. I am doing an analysis of a very large...

• Replies: 0
• Views: 3,149
cdo
05-18-2010, 05:25 PM
22. ### moderated hierarchical regression

Hello, I urgently need help. I have to test a hypothesis regarding moderating role. I know the procedure how to do it in SPSS with moderated...

• Replies: 0
• Views: 3,149
09-03-2012, 02:51 PM
23. ### Multiple Linear Regression in Environmental Justice Analysis

Hi, I have 982 data points (census block groups) for which I have information on % minority and low income, and levels of air pollution. I did MLR...

• Replies: 3
• Views: 3,146
08-18-2011, 04:50 PM
24. ### Determining weighting factors from linear regression

Hi, I am working on a digital filtering project where I am trying to optimize a filter for a Doppler ultrasound application. Without going in to...

• Replies: 0
• Views: 3,146
03-26-2012, 06:20 PM
25. ### Testing IIA in MNLM with Hausman-McFadden

Dear all, I'm having some problems with the IIA property violation test of Hausman McFadden. I estimated two MNL models based on 3 predictors:...

• Replies: 0
• Views: 3,145
09-22-2010, 08:35 AM
26. ### (Li'l) theoretical question about correlations in regression...

hey y'all people!??! how're y'all doooin' huh? i hope everyone had the most awesomest holidays!!! heh. so... who else is feelin' the pinch this...

• Replies: 9
• Views: 3,143
01-09-2012, 02:44 AM
27. ### A priori Power Analysis

Hey Guys, I am a newbie and have a question on power analysis. I would like to measure the effect of an intervention on various measures and...

• Replies: 2
• Views: 3,143
08-15-2016, 04:10 AM
28. ### Comparing importance of predictors - unstandardized or standardized beta?

Hi, can someone explain me should I compare importance of two predictors by their unstandardized or standardized beta? If both are significant, I...

• Replies: 3
• Views: 3,141
05-06-2013, 03:49 PM
29. ### Intepretation of intercept in repeated-measures regression model

Hello, According to my understanding, in linear regression if there's an interaction including continuous predictors then the intercept is not...

• Replies: 3
• Views: 3,140
06-28-2012, 08:18 AM
30. ### Linear regression - Controlling the pre-measure of my response variable

Hello everyone! :wave: Context: I want to analyze the change in anxiety scores (STAI) in a group of patients undergoing surgery and relate it to...

• Replies: 5
• Views: 3,139
11-14-2012, 11:53 AM
31. ### How to interpret a discontinuous Q-Q plot with jump

Hello, I am currently generating some plots to test whether the given linear model meets all the theoretical assumptions of linear regression. One...

• Replies: 1
• Views: 3,139
11-17-2013, 10:22 PM
32. ### effect size in multiple linear regression

Hello, I have (from SPSS) many multiple regression analyses, and each one has about 7-8 independent variables. I need to find the effect size-in...

• Replies: 1
• Views: 3,138
07-04-2012, 06:44 AM
33. ### need help choosing the right model

following another thread I opened, I need your advice to choose the correct logistic model. I had 8 IV's, I ran 8 univariate models (used the method...

• Replies: 0
• Views: 3,136
08-24-2010, 06:57 AM
34. ### Stats analysis help would be very much appreciated

I have carried out some research. The research involved respondents filling in a questionnaire of 62 questions. Answers were on a scale - Strongly...

• Replies: 4
• Views: 3,135
01-20-2009, 06:33 AM
35. ### What is the “pdm” stat in the “rms” R package?

I am new to the world of Regression in statistics and I have been doing a research in which I am building an ordinal logistic regression model (ORM)....

• Replies: 0
• Views: 3,133
11-27-2014, 07:17 PM
36. ### Calculate the MSE of s-squared

Consider the multiple regression model y=Xb+u where u~N(0,sigma-squared times identity) where b is a Kx1 vector, X is a non-stochastic full rank...

• Replies: 0
• Views: 3,131
05-01-2011, 06:35 AM
37. ### R-Sq Relevance

Hi, I have the following figures after creating a linear regression model using mintab: S = 2.65155 R-Sq = 31.8% R-Sq(adj) = 31.6% PRESS...

• Replies: 3
• Views: 3,131
08-15-2012, 10:53 AM
38. ### Assumptions that underlie a regresion model

Are there any statistical tests that i can use to evaluate whether the assumptions for the regression model are being met? The assumptions i want...

• Replies: 4
• Views: 3,130
09-26-2011, 11:52 AM
39. ### multiple regression with power law relationship [help!!!]

I am trying to carry out multiple regression of a dependent variable (DV)with 2 independent variables (IV1 & IV2) that exhibit power law relationship...

• Replies: 0
• Views: 3,130
12-23-2012, 07:43 PM
40. ### Multiple regression analysis for 3 groups

Hi I am doing a multiple regresion analysis for my project. If I have 3 groups which are nominal data (nationality: PL, ENG, and PL who moved to...

• Replies: 10
• Views: 3,129
03-10-2013, 05:01 PM
41. ### How to do a added variable plot in minitab?

Hi, I have a data set of measurements for body fat, two of the variables are age and neck circumference. I've been asked to estimate the amount...

• Replies: 0
• Views: 3,129
11-13-2013, 05:05 PM
42. ### 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: 3,128
02-22-2013, 03:34 AM
43. ### Correlation VS linear regression using proportional data

Hi, I was hoping someone may be able to assist. I have discussed this with two people who understand a great deal about stats, although I read...

• Replies: 0
• Views: 3,127
09-28-2016, 11:52 AM
44. ### 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: 3,125
02-08-2013, 08:43 AM
45. ### non zero mean gaussian error in least squares

Dear all, I have the classic Least squares problem Ax=b, but with Gaussian noise at both A and b. I found out that total least squares can be...

• Replies: 0
• Views: 3,123
01-25-2012, 11:29 AM
46. ### Interpreting Marginal Effect - Probit

I am using a probit model, where one of the variables is log(income). I calculated the (average) marginal effect and it resulted in 0.03. I am a...

• Replies: 1
• Views: 3,123
03-15-2013, 08:08 AM
47. ### Logit Equation - fitting the quadratic

Hi, I posted a question in the main stats forum, but basically, I wondered if anyone knows the formula to fit the quadratic to the logit equation?...

• Replies: 1
• Views: 3,121
04-16-2011, 11:48 PM
48. ### Find the affect of introducing a variable into a Data Set

Good morning, Everyone! I apologize, but I must admit that it's been a few years since I've been engaged in any statistical analysis; that being...

• Replies: 3
• Views: 3,120
07-11-2011, 08:21 PM
49. ### Help! model comparison in logistic regression

Dear all, I'm working on a logistic regression and have now obtained two competing models (one computed by hand, the other with "step" in R). In...

• Replies: 3
• Views: 3,120
edi
03-16-2012, 03:17 AM
50. ### Comparing coefficients on two same DV same IV models

I'm running regressions on two models using the same (8) independent and dependent variables. The dependent variable in the two models spans two...

• Replies: 3
• Views: 3,118
09-19-2013, 09:58 AM
51. ### GLM Interpretation - confused.com

Hi Folks, This may seem pretty straight forward to many of you but I'm could really do with some help. I'm using the generalized linear model to...

• Replies: 3
• Views: 3,113
11-01-2011, 09:46 AM
52. ### Choosing the best dependent variable (Y)

Hello, I'm working on a multiple regression model. The dependent variable (Y) is an ordered multinomial qualitative variable. To do regression...

• Replies: 5
• Views: 3,112
12-03-2012, 05:03 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: 3,111
02-06-2013, 07:22 AM
54. ### Interaction Terms: Logistic Regression

Dear forum, trying again... I would really like some advice on the proper construction and interpretation of a small experiment and analysis...

• Replies: 7
• Views: 3,109
10-23-2013, 05:33 PM
55. ### 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: 3,105
06-21-2013, 03:06 AM
56. ### The Mediation Analysis by Regression

Hi All, Does Anyone Know a good reference to conduct the Mediation Analysis by Regression by SPSS? Many thanks, Gh

• Replies: 4
• Views: 3,100
12-01-2011, 12:13 PM

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