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Forum: Regression Analysis

Linear regression, linear models, nonlinear regression

  1. Statistical inference.

    Hi there, I would like to ask a couple of basic questions: 1. What is the difference between estimation and hypothesis testing? I mean are they...

    Started by Abubaker‎, 01-08-2017 06:25 AM
    hypothesis testing, model selection, modeling techniques, statistical inference
    • Replies: 1
    • Views: 1,628
    01-09-2017, 02:01 PM Go to last post
  2. Individual versus aggregate regression

    What is the difference between doing regression at an individual versus a aggregate level This is an example of what I am talking about for...

    Started by noetsi‎, 01-07-2017 02:09 PM
    • Replies: 0
    • Views: 1,606
    01-07-2017, 02:09 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: 2,096
    01-07-2017, 12:43 PM Go to last post
  4. 'e' in expected values in Poisson

    Using this example (see below) could someone please tell me what the 'e' symbol stands for and how one would work out the expected values manually. ...

    Started by sarahharding‎, 01-05-2017 11:44 AM
    expected values, poisson distribution, poisson regression, symbols
    • Replies: 1
    • Views: 1,630
    01-05-2017, 02:43 PM Go to last post
  5. Question Data input- ordered logistic regression

    Hello, I am trying to analyze the relationship between mode familiarity and Technology & demographic characteristics. So I have an ordinal dependent...

    Started by paranjyoti‎, 01-05-2017 09:09 AM
    data analysis, logistic regression, regression analysis, spss
    • Replies: 0
    • Views: 1,165
    01-05-2017, 09:09 AM Go to last post
  6. Regression analysis in R - which variables to include?

    Hi all, I am doing causal research between the relation between a dependent variable Y which consists of 4 phases (so 4 dependent variables Y1,...

    Started by koot6133‎, 01-05-2017 07:45 AM
    correlation, multiple regression, selection of variables
    • Replies: 0
    • Views: 1,369
    01-05-2017, 07:45 AM Go to last post
  7. Is Using an Explanatory Variable that Defines My X-Y Pairs Correct ??

    Hello My question is basic I guess: My data looks like this: obs date Y X 1 1/1/2010 5.6 3 2 1/2/2010 7.9 5 3 ...

    Started by Meytar‎, 01-03-2017 02:45 PM
    • Replies: 0
    • Views: 1,663
    01-03-2017, 02:45 PM Go to last post
  8. Cool weird difference between measures of Goodness-of-Fit ??

    Dear stats friends I have run an ordinal regression in SPSS on 700 subjects I have data on an ordinal DV: heart disease score between 0 and 3. ...

    Started by wulfgar‎, 12-30-2016 12:38 PM
    • Replies: 2
    • Views: 2,291
    12-30-2016, 12:45 PM Go to last post
  9. Complicated Research quesiton

    Im looking to do some research in the social science field and I have to do a statistical analysis of a complicated set of self report measures. I'd...

    Started by danmpc‎, 12-28-2016 06:52 AM
    • Replies: 8
    • Views: 2,316
    12-30-2016, 12:33 PM Go to last post
  10. Post Calculating the multiple regression function via canonical correlation analysis

    I've got one dependent variable and two independent variables. I need to calculate the multiple regression function via canonical correlation...

    Started by floflo‎, 12-29-2016 02:35 PM
    canonical, canonical analysis, eigenvalue, multiple regression, svd
    • Replies: 0
    • Views: 1,631
    12-29-2016, 02:35 PM Go to last post
  11. 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?

    Started by bikingman‎, 12-28-2016 04:02 PM
    anova
    • Replies: 3
    • Views: 1,580
    12-28-2016, 09:46 PM Go to last post
  12. General linear model and residuals

    Hi, i'm using SPSS for analysis of my data using general linear model with 3 independet factors (2 levels each) and one independent ordinal factor (4...

    Started by igsimoes‎, 12-26-2016 12:55 PM
    • Replies: 0
    • Views: 1,719
    12-26-2016, 12:55 PM Go to last post
  13. How to Compare B Coefficients within and between models in R?

    Hello people, I am new to this forum and it would be great if some experienced people could help met out. I would like to know what the...

    Started by KevinAdam‎, 12-24-2016 05:00 PM
    • Replies: 1
    • Views: 2,121
    12-25-2016, 04:16 AM Go to last post
  14. Newbie needs some help with his model interpretation

    Hello, i am quite new in the world of statistical problems :) I have read some lecture notes and books to solve my current problem, but i am note...

    Started by R_Newcomer‎, 12-24-2016 09:52 AM
    • Replies: 0
    • Views: 1,901
    12-24-2016, 09:52 AM Go to last post
  15. Regression on estimated variables

    I'm making a two-step analysis for my data. First Step: I've collected inflation and interest rate data for 25 countries in a monthly frequency...

    Started by glima‎, 12-22-2016 08:18 AM
    measurement error, regression, standard errors
    • Replies: 2
    • Views: 1,824
    12-23-2016, 09:52 AM Go to last post
  16. Beginner's question: Is profit/loss data always ratio in nature? How to treat it?

    Hello, I'm afraid this is another beginner's question. I've only recently grasped the fundamentals of linear and multiple linear regression and I...

    Started by MrPink‎, 12-21-2016 08:43 AM
    beginner, lineal model, ratio
    • Replies: 3
    • Views: 1,792
    12-21-2016, 06:06 PM Go to last post
  17. Random intercept only for 1 subgroup in lmer

    Dear all, suppose I have a case study with 3 different populations, A, B and C. For all groups I have data on, e.g. body mass, length and sex of a...

    Started by Luke‎, 12-21-2016 03:30 AM
    • Replies: 2
    • Views: 1,953
    12-21-2016, 12:12 PM Go to last post
  18. Calculating probabilities from logit parameters estimated with effect coding

    Hello, I calculated this multinomial logit model using an effect coding (-1 0 1). The variable edu3 is the education level (3 categories), sex has...

    Started by Demographer‎, 12-21-2016 03:39 AM
    • Replies: 0
    • Views: 1,391
    12-21-2016, 03:39 AM Go to last post
  19. moderation in SPSS vs. PROCESS

    Hi. I did mediation and moderation analysis of one model in 2 programs: SPSS and PROCESS (macro). Mediation was the same, but moderation was...

    Started by Ginny Joyce‎, 10-15-2016 08:14 AM
    moderation, process, spss
    • Replies: 2
    • Views: 2,642
    12-19-2016, 08:35 AM Go to last post
  20. 3-way ANOVA for paired groups and repeated measures or a GEE

    Hi! I need help for data analysis of my masters.I work with awake rats in pharmacology experiments. In my experiment I have some groups of treatment...

    Started by igsimoes‎, 12-17-2016 07:26 AM
    • Replies: 2
    • Views: 1,587
    12-18-2016, 11:01 AM Go to last post
  21. When to use Augmented Dickey Fuller test vs Dickey Fuller Test - Time series

    Checking a variable for I(1) process, when should i use a ADF vs DF test?

    Started by maasi007‎, 12-17-2016 10:01 AM
    arma, dickey fuller augmented, dickey fuller test, time series, time series analysis
    • Replies: 1
    • Views: 1,817
    12-17-2016, 12:30 PM Go to last post
  22. 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...

    Started by bball3212‎, 12-16-2016 10:37 AM
    • Replies: 0
    • Views: 1,368
    12-16-2016, 10:37 AM Go to last post
  23. help in model

    I have a data set like that ID Wight age sex season region response 1 60 40 1 4 2 1000 2 65 ...

    Started by mosthamed‎, 12-16-2016 05:35 AM
    • Replies: 1
    • Views: 1,630
    12-16-2016, 09:00 AM Go to last post
  24. Repeated Measures model with Covariates

    Hi Everyone, i am struggling with finding a good way to analyze a dataset. The design is this: I have 25(n) subjects, all of them are tested in an...

    Started by cecilia‎, 12-15-2016 04:49 AM
    categorical, covariate, model, multiple regression, repeated measures
    • Replies: 1
    • Views: 1,885
    12-16-2016, 02:23 AM Go to last post
  25. How to calculate residual covariance in R

    I know it is may be a silly question but I am looking for an answer if I fitted a linear model c<- lm (y~ a+ b) I need to get the residual...

    Started by mosthamed‎, 12-15-2016 06:45 AM
    linear model
    • Replies: 1
    • Views: 1,720
    12-16-2016, 02:18 AM Go to last post
  26. Linear Regression - Beginner Need Help

    Hello everyone, I have a simple exercise to do about linear regressions and models but I have a few doubts. The exercise gives you 2 vectors(let's...

    Started by dieselonthecouch‎, 12-14-2016 10:38 AM
    • Replies: 4
    • Views: 2,053
    12-14-2016, 03:04 PM Go to last post
  27. 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...

    Started by bikingman‎, 12-14-2016 12:59 PM
    ordinary least squares
    • Replies: 0
    • Views: 1,206
    12-14-2016, 12:59 PM Go to last post
  28. Question Adaptive Lasso and CrossValidation for SNV selection

    Hello everyone, I have available 17 000 variables (SNV frequencies, a certain number of zeros) for 40 patients. Each patient is represented by its...

    Started by CorentinR‎, 12-13-2016 07:29 AM
    adaptive-lasso, cross-validation, high throughput, variable selection
    • Replies: 3
    • Views: 1,955
    12-13-2016, 11:51 AM Go to last post
  29. SEM versus multiple regression?

    Hello. I have a within-subjects longitudinal design with two time points. There are two DVs and 3 IVs. All are measured at both time points. I used a...

    Started by morlei‎, 12-13-2016 10:27 AM
    • Replies: 1
    • Views: 1,439
    12-13-2016, 10:41 AM Go to last post
  30. Mixed effects using nlme in R

    If I include an interaction (time*score) in my model the main effect (score) is significant. However, if I remove the covariate (time), the effect...

    Started by Palermo‎, 12-05-2016 05:55 PM
    • Replies: 3
    • Views: 2,009
    12-13-2016, 03:44 AM Go to last post
  31. mixed effects influence of interaction

    Can someone confirm that the following are correct. I'm trying to model both the random intercept and random intercept/slope models. Random...

    Started by Palermo‎, 12-12-2016 11:15 PM
    • Replies: 2
    • Views: 1,672
    12-13-2016, 03:25 AM Go to last post
  32. Logistic Regression Output

    Hey All, Can someone help me make sense of this Minitab output? A few questions I had are: What does the odds ratio statistic mean? what does...

    Started by MaxPowers‎, 12-11-2016 11:16 PM
    • Replies: 3
    • Views: 2,303
    12-13-2016, 01:44 AM Go to last post
  33. Poverty analysis and multiple linear regression

    Hi. I have a dataset and I intend to use multiple linear regression analysis with excel since the dataset isn't that massive in volume, just about...

    Started by auroraborealis‎, 12-12-2016 07:37 AM
    regression analysis
    • Replies: 0
    • Views: 1,717
    12-12-2016, 07:37 AM Go to last post
  34. Urgent: data format in regression analyses

    Hi all, I'm suffering a lit bit with some data I have to analyse (my first time...) and I have many doubts. We manipulated 3 IVs that were shown...

    Started by Phoolan_D‎, 12-10-2016 11:13 PM
    • Replies: 0
    • Views: 1,436
    12-10-2016, 11:13 PM Go to last post
  35. Regression with two data sets?

    I have two data sets. Set 1 contains daily flights and delay data: Flight Date Carrier Departure Delay, ranging from 0 to 1650 minutes. ...

    Started by kdsan‎, 11-01-2016 09:49 PM
    • Replies: 1
    • Views: 1,604
    12-10-2016, 10:35 PM Go to last post
  36. Lightbulb Need help with data for regression analysis

    I have extracted the following values from Draper and Smith (1998) for independent variable X, dependent variable Y for regression analysis: ...

    Started by Johsins69‎, 11-22-2016 12:17 PM
    • Replies: 2
    • Views: 1,982
    12-10-2016, 10:09 PM Go to last post
  37. LinearRegressionQuestions

    Hello, Can someone please help with Question 1.3 onwards in the attached file. Thanks, AJ

    Started by analyticsjane‎, 12-10-2016 07:50 AM
    • Replies: 0
    • Views: 1,587
    12-10-2016, 07:50 AM Go to last post
  38. Interpretation Interaction Term

    Hey, maybe you could help me with this interpretation (i'm learning with the slides). The model is about employment chances and the independen...

    Started by Hansbusch‎, 12-09-2016 06:23 PM
    • Replies: 0
    • Views: 1,101
    12-09-2016, 06:23 PM Go to last post
  39. Table interpretation (odds)

    Can someone help me interpret and understand this table? The question is: What effect does the age have on the odds for bodyweight=1 for persons who...

    Started by dymatize‎, 12-08-2016 08:14 AM
    • Replies: 2
    • Views: 1,588
    12-09-2016, 05:06 PM Go to last post
  40. conditional logit model_help with data interpretation

    0 down vote favorite I have performed a clogit following the instruction of Aizaki et al.2012 but I am not sure on how to interpret some results...

    Started by senzu‎, 12-08-2016 12:13 PM
    clogit, coefficient, logit model
    • Replies: 4
    • Views: 1,871
    12-09-2016, 09:26 AM Go to last post
  41. Logistic Regression - Predicted Probabilities with unknown variables

    Hi all, I'm wondering about how to calculate predicted probabilities using a binary logistic regression model when one or more of the variables in...

    Started by augustin‎, 12-06-2016 05:21 PM
    logistic regression
    • Replies: 2
    • Views: 1,755
    12-07-2016, 10:11 AM Go to last post
  42. Hello, I need some help please with two problems

    Hey guys, I have been struggling in this class and I am down to the last week, I have to pass this homework and extra credit problem to pass the...

    Started by run2rush2112‎, 12-02-2016 10:11 PM
    • Replies: 2
    • Views: 1,617
    12-04-2016, 08:13 PM Go to last post
  43. Regression for comparing two groups on one variable? And t-test with survey data?

    Hi - I have two populations / groups that I need to compare on one variable. Now usually I would use a t-test or anova but ive been told that...

    Started by TruroJP‎, 11-30-2016 05:01 PM
    analysis, anova, regression, t-test
    • Replies: 2
    • Views: 1,837
    12-02-2016, 04:41 PM Go to last post
  44. Multiple Logistic Regression question

    Greetings, I have three categorical IVs and one categorical DV. However, the DV is a self-reported ranking from 1 to 4 (1= not important, 4 = very...

    Started by Luxor‎, 11-30-2016 02:29 PM
    • Replies: 4
    • Views: 1,648
    12-01-2016, 01:46 PM Go to last post
  45. Which analysis represents better the "worse-ness" of my linear regression?

    Hello all, If I have two sets of data points, for instance: 1 10 2 14 3 17 4 12 5 19

    Started by mode1111‎, 11-28-2016 03:34 PM
    linear regression, statistical analysis
    • Replies: 2
    • Views: 1,711
    11-29-2016, 07:12 AM Go to last post
  46. P-value for a regression where expected slope is 1:1

    Hi, I am comparing two values for vegetation cover from two time periods. The expected value is y=x for the slope. I am curious how to calculate a...

    Started by drm258‎, 11-23-2016 07:09 PM
    • Replies: 6
    • Views: 1,784
    11-26-2016, 09:40 AM Go to last post
  47. Least squares estimate of alpha and beta

    My group have different opinions towards the following question: Find the least squares estimate of alpha and beta of the mechanistic growth...

    Started by acc_aac‎, 11-24-2016 05:02 AM
    nonlinear regression
    • Replies: 1
    • Views: 1,506
    11-24-2016, 10:23 AM Go to last post
  48. How to compute r squared in linear mixed model

    It's kind of urgent. i need to hand out my thesis in 3 days from now :/ Can someone explain me how to computer r squared in linear mixed model? i...

    Started by tal_spi‎, 11-24-2016 10:11 AM
    • Replies: 0
    • Views: 1,385
    11-24-2016, 10:11 AM Go to last post
  49. Standard Regression Analysis / urgent help for stats beginner.

    Hi Guys! I'm fairly new to statistics and am conducting a standard regression analysis with 1 predictor variable ( following from a pearsons...

    Started by Valeriosmith‎, 11-22-2016 06:50 AM
    • Replies: 5
    • Views: 2,057
    11-22-2016, 12:57 PM Go to last post
  50. Nominal vs. Ordinal

    Say i'm using age groups which are not equal in size and interval (1-2,2-4,5-8years) is it better when using a regression model to set this variable...

    Started by avisev‎, 11-20-2016 04:47 PM
    • Replies: 3
    • Views: 1,669
    11-21-2016, 04:40 PM Go to last post
  51. Poission with random effects

    Hi, I have two levels in my poission regression model with random effects (children and family level) which predicts count data after i get the...

    Started by avisev‎, 11-20-2016 04:37 PM
    • Replies: 0
    • Views: 1,334
    11-20-2016, 04:37 PM Go to last post
  52. Help with multilevel multinomial logistic regression and missing data

    Hi all - I would really appreciate some thoughts/advice. I'm working with survey data containing individual responses nested within a number of...

    Started by mattas‎, 11-16-2016 04:42 PM
    • Replies: 0
    • Views: 1,412
    11-16-2016, 04:42 PM Go to last post
  53. Insignificant interaction effect in regression vs. scatterplot indicating interaction

    Hallo, I'm new to this forum and hope I can make my problem clear. I conducted a multiple regression analysis to, among other things, test the...

    Started by Norbert22‎, 11-16-2016 09:41 AM
    • Replies: 1
    • Views: 984
    11-16-2016, 10:46 AM Go to last post
  54. Exclamation What experimental design would be most appropriate?

    In my study I have two study groups: Group A is composed of X subjects which are either males or females, and every subject is characterized by...

    Started by sylnyapi‎, 11-15-2016 01:18 PM
    • Replies: 0
    • Views: 1,110
    11-15-2016, 01:18 PM Go to last post
  55. logistic regression or survival analysis?

    Hello, I have two main questions that I hope you help me answer. Let me give you the scenario first. Letís say that some students in a school are...

    Started by Marvin85‎, 11-14-2016 04:44 PM
    controlling for time, survival analysis, time post
    • Replies: 4
    • Views: 1,514
    11-15-2016, 10:41 AM Go to last post
  56. Question How to parameterize this crazy data?

    So, a colleague of mine, who is a survey methodologist, is proposing to do an experiment on a survey. * The purpose of the experiment is to see...

    Started by SabbyATL‎, 11-14-2016 07:00 PM
    parameterization
    • Replies: 0
    • Views: 965
    11-14-2016, 07:00 PM Go to last post
  57. Post-Hoc Power Analysis (G*Power) for simple linear regression

    Hey everyone! I conducted a simple linear regression with non-significant results. Now I would like to analyze the power of this calculation using...

    Started by nziza‎, 11-11-2016 07:00 AM
    effect size, g*power, post-hoc, power analysis, simple linear regression
    • Replies: 0
    • Views: 1,369
    11-11-2016, 07:00 AM Go to last post
  58. Thumbs up Exam pass rate analysis

    Hi, looking for some help with some analysis I am looking at on Minitab for exam pass marks. I have a data set which shows global student...

    Started by iannimmo‎, 11-10-2016 11:38 AM
    • Replies: 1
    • Views: 1,381
    11-10-2016, 11:47 AM Go to last post
  59. Have 4 dependent and 10 independent variables - which test should I use?

    Hi all, I'm interested in the potential effects of water pollution on feather color of a bird. For this, I calculated 4 color variables for each...

    Started by NatL‎, 11-09-2016 04:47 PM
    dbrda, linear regression, multivariate analysis, permanova, ridge regression
    • Replies: 0
    • Views: 1,173
    11-09-2016, 04:47 PM Go to last post
  60. please help me make sense of my multilevel linear regression [R]

    Hi everyone, I'm trying to wrap my head around multilevel (or mixed-effect) models, but not quite succeeding. I have the following data from a...

    Started by Junes‎, 11-07-2016 03:46 PM
    multilevel
    • Replies: 0
    • Views: 1,028
    11-07-2016, 03:46 PM Go to last post

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