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Forum: Regression Analysis

Linear regression, linear models, nonlinear regression

  1. Unhappy 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 ...

    Started by smile:D‎, 01-20-2011 10:58 AM
    sxx, syy
    • Replies: 1
    • Views: 3,187
    01-20-2011, 12:04 PM Go to last post
  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...

    Started by slcjim‎, 03-21-2013 11:29 PM
    confidence intervals, logistic regression
    • Replies: 0
    • Views: 3,185
    03-21-2013, 11:29 PM Go to last post
  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...

    Started by Volvo742‎, 01-06-2017 08:22 AM
    • Replies: 8
    • Views: 3,185
    01-07-2017, 12:43 PM Go to last post
  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...

    Started by Valido‎, 07-23-2014 03:34 AM
    • Replies: 1
    • Views: 3,182
    07-27-2014, 04:11 PM Go to last post
  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...

    Started by trinker‎, 05-31-2012 10:19 PM
    • Replies: 7
    • Views: 3,177
    06-02-2012, 09:24 PM Go to last post
  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...

    Started by Jake‎, 10-17-2014 03:45 PM
    • Replies: 8
    • Views: 3,175
    02-07-2015, 07:06 PM Go to last post
  7. Help needed with time series cross sectional regression

    Hi all. I'm currently running a time series cross sectional regression on SAS 9.3. I have 7 variables: firm (f), time (t), stock returns (ar),...

    Started by Radfern‎, 03-27-2014 10:33 AM
    • Replies: 0
    • Views: 3,170
    03-27-2014, 10:33 AM Go to last post
  8. 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...

    Started by FailedStats101‎, 02-28-2006 08:19 AM
    • Replies: 3
    • Views: 3,169
    02-28-2006, 11:35 PM Go to last post
  9. 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...

    Started by figone‎, 01-29-2014 04:59 PM
    • Replies: 6
    • Views: 3,169
    03-22-2014, 02:04 PM Go to last post
  10. 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...

    Started by Gert Van Dessel‎, 09-03-2015 02:33 AM
    customer satisfaction, key driver analysis, root cause analysis
    • Replies: 0
    • Views: 3,169
    09-03-2015, 02:33 AM Go to last post
  11. application of regression model - which one to choose? please help

    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...

    Started by KathiF‎, 11-17-2011 11:34 AM
    • Replies: 10
    • Views: 3,166
    11-22-2011, 02:03 PM Go to last post
  12. 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...

    Started by hochie‎, 04-23-2010 07:26 PM
    • Replies: 2
    • Views: 3,163
    04-25-2010, 10:13 PM Go to last post
  13. 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"...

    Started by winecoding‎, 02-08-2011 04:33 PM
    • Replies: 1
    • Views: 3,163
    02-08-2011, 06:00 PM Go to last post
  14. 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...

    Started by Time Serious‎, 01-10-2012 05:58 AM
    arima, auto-regressive, forecasting, seasonal, time series
    • Replies: 10
    • Views: 3,163
    01-11-2012, 02:27 PM Go to last post
  15. dummy variables

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

    Started by slacknoise‎, 07-27-2012 04:39 AM
    • Replies: 4
    • Views: 3,160
    07-27-2012, 06:49 AM Go to last post
  16. [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...

    Started by jfca283‎, 04-24-2014 11:23 AM
    • Replies: 4
    • Views: 3,160
    04-24-2014, 12:51 PM Go to last post
  17. 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...

    Started by akak‎, 07-14-2011 10:20 PM
    • Replies: 0
    • Views: 3,159
    07-14-2011, 10:20 PM Go to last post
  18. 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? ...

    Started by hereiamat‎, 04-05-2010 09:34 AM
    • Replies: 0
    • Views: 3,156
    04-05-2010, 09:34 AM Go to last post
  19. Red face 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...

    Started by monalisa09‎, 07-24-2013 11:11 PM
    • Replies: 1
    • Views: 3,156
    07-25-2013, 04:58 PM Go to last post
  20. 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...

    Started by SadieKhan‎, 04-27-2011 12:25 PM
    • Replies: 2
    • Views: 3,152
    04-27-2011, 03:07 PM Go to last post
  21. 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,...

    Started by jiaxiking‎, 01-04-2015 05:55 PM
    • Replies: 10
    • Views: 3,150
    01-05-2015, 09:37 PM Go to last post
  22. 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...

    Started by cdo‎, 05-18-2010 05:25 PM
    • Replies: 0
    • Views: 3,149
    05-18-2010, 05:25 PM Go to last post
  23. Exclamation 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...

    Started by ana2012‎, 09-03-2012 02:51 PM
    • Replies: 0
    • Views: 3,149
    09-03-2012, 02:51 PM Go to last post
  24. 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...

    Started by aida‎, 08-18-2011 03:09 PM
    • Replies: 3
    • Views: 3,146
    08-18-2011, 04:50 PM Go to last post
  25. 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...

    Started by arefox‎, 03-26-2012 06:20 PM
    • Replies: 0
    • Views: 3,146
    03-26-2012, 06:20 PM Go to last post
  26. 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:...

    Started by Roel‎, 09-22-2010 08:35 AM
    • Replies: 0
    • Views: 3,145
    09-22-2010, 08:35 AM Go to last post
  27. Calibration of five-hole pressure probe - Regression problem

    Hi, I have a big problem with a calibration of a five-hole pressure probe, especially with regression part. The pressure probe messures five...

    Started by Meiner‎, 08-22-2013 01:04 PM
    • Replies: 2
    • Views: 3,144
    08-23-2013, 02:13 AM Go to last post
  28. (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...

    Started by spunky‎, 01-08-2012 02:09 PM
    • Replies: 9
    • Views: 3,143
    01-09-2012, 02:44 AM Go to last post
  29. Post 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...

    Started by floriisco‎, 08-13-2016 11:02 AM
    hypothesis testing, lmr, power analysis
    • Replies: 2
    • Views: 3,143
    08-15-2016, 04:10 AM Go to last post
  30. 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...

    Started by Anchyboom‎, 05-06-2013 12:43 PM
    • Replies: 3
    • Views: 3,141
    05-06-2013, 03:49 PM Go to last post
  31. 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...

    Started by ganajr‎, 06-27-2012 10:47 PM
    • Replies: 3
    • Views: 3,140
    06-28-2012, 08:18 AM Go to last post
  32. 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...

    Started by Mase‎, 11-13-2012 03:33 AM
    • Replies: 5
    • Views: 3,139
    11-14-2012, 11:53 AM Go to last post
  33. 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...

    Started by JDneverSleeps‎, 11-17-2013 09:20 PM
    linear regression
    • Replies: 1
    • Views: 3,139
    11-17-2013, 10:22 PM Go to last post
  34. 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...

    Started by penvla‎, 07-04-2012 04:37 AM
    • Replies: 1
    • Views: 3,138
    07-04-2012, 06:44 AM Go to last post
  35. 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...

    Started by WeeG‎, 08-24-2010 06:57 AM
    • Replies: 0
    • Views: 3,136
    08-24-2010, 06:57 AM Go to last post
  36. 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...

    Started by oakmoss‎, 01-18-2009 09:32 AM
    • Replies: 4
    • Views: 3,135
    01-20-2009, 06:33 AM Go to last post
  37. 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)....

    Started by danielalencar‎, 11-27-2014 07:17 PM
    measurement, orm, pdm, regression, rms
    • Replies: 0
    • Views: 3,133
    11-27-2014, 07:17 PM Go to last post
  38. 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...

    Started by eBopBob‎, 05-01-2011 06:35 AM
    • Replies: 0
    • Views: 3,131
    05-01-2011, 06:35 AM Go to last post
  39. 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...

    Started by arkantosno1‎, 08-15-2012 04:36 AM
    • Replies: 3
    • Views: 3,131
    08-15-2012, 10:53 AM Go to last post
  40. 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...

    Started by katlego‎, 09-23-2011 08:45 PM
    residual plots, residuals
    • Replies: 4
    • Views: 3,130
    09-26-2011, 11:52 AM Go to last post
  41. 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...

    Started by lingdeer‎, 12-23-2012 07:43 PM
    multiple regression, power law, spss, tranformation
    • Replies: 0
    • Views: 3,130
    12-23-2012, 07:43 PM Go to last post
  42. 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...

    Started by ilona‎, 03-07-2013 04:48 PM
    • Replies: 10
    • Views: 3,129
    03-10-2013, 05:01 PM Go to last post
  43. 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...

    Started by AMcC‎, 11-13-2013 05:05 PM
    added variable plot, fitted line plot, regression
    • Replies: 0
    • Views: 3,129
    11-13-2013, 05:05 PM Go to last post
  44. 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...

    Started by stats-student‎, 02-21-2013 12:32 PM
    • Replies: 4
    • Views: 3,128
    02-22-2013, 03:34 AM Go to last post
  45. 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...

    Started by jonpaul31‎, 09-28-2016 11:52 AM
    • Replies: 0
    • Views: 3,127
    09-28-2016, 11:52 AM Go to last post
  46. 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.

    Started by zarasandreas‎, 02-05-2013 06:58 AM
    • Replies: 6
    • Views: 3,125
    02-08-2013, 08:43 AM Go to last post
  47. 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...

    Started by samweckx‎, 01-25-2012 11:29 AM
    • Replies: 0
    • Views: 3,123
    01-25-2012, 11:29 AM Go to last post
  48. 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...

    Started by zahg‎, 03-15-2013 05:37 AM
    • Replies: 1
    • Views: 3,123
    03-15-2013, 08:08 AM Go to last post
  49. Skew in data

    I have a huge data set, 10,000 points is common. I have significant skew in my data and some large outliers. Some authors argue addressing skew with...

    Started by noetsi‎, 03-14-2016 08:43 AM
    2 Pages
    1 2
    • Replies: 17
    • Views: 3,122
    03-18-2016, 05:06 PM Go to last post
  50. 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?...

    Started by Knockout‎, 04-16-2011 05:08 AM
    • Replies: 1
    • Views: 3,121
    04-16-2011, 11:48 PM Go to last post
  51. 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...

    Started by sapiensgladio‎, 07-11-2011 01:37 PM
    conversion, regression
    • Replies: 3
    • Views: 3,120
    07-11-2011, 08:21 PM Go to last post
  52. 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...

    Started by caro‎, 03-15-2012 06:31 AM
    • Replies: 3
    • Views: 3,120
    03-16-2012, 03:17 AM Go to last post
  53. Which forecast method for a time series like this one?

    Hi everyone, I do have a time series composed by 45 monthly observations and I am trying to figure out which kind of forecasting method is best...

    Started by Mark_‎, 10-11-2016 10:05 AM
    • Replies: 10
    • Views: 3,119
    01-31-2017, 05:36 PM Go to last post
  54. 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...

    Started by robin772‎, 09-18-2013 10:54 AM
    • Replies: 3
    • Views: 3,118
    09-19-2013, 09:58 AM Go to last post
  55. 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...

    Started by railway‎, 10-21-2011 10:00 AM
    • Replies: 3
    • Views: 3,113
    11-01-2011, 09:46 AM Go to last post
  56. 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...

    Started by goldenboy‎, 11-23-2012 05:16 AM
    best dependent variable
    • Replies: 5
    • Views: 3,112
    12-03-2012, 05:03 AM Go to last post
  57. 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....

    Started by azurerider‎, 02-06-2013 07:22 AM
    • Replies: 0
    • Views: 3,111
    02-06-2013, 07:22 AM Go to last post
  58. 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...

    Started by rclukey‎, 10-23-2013 12:02 PM
    interaction terms, logistic, regression
    • Replies: 7
    • Views: 3,109
    10-23-2013, 05:33 PM Go to last post
  59. 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...

    Started by Binka‎, 06-21-2013 03:06 AM
    • Replies: 0
    • Views: 3,105
    06-21-2013, 03:06 AM Go to last post
  60. 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

    Started by ghada8888‎, 11-30-2011 01:48 PM
    • Replies: 4
    • Views: 3,100
    12-01-2011, 12:13 PM Go to last post

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