dummy variable

  1. M

    Too many dummy variables in Regression

    we have about 50000 models of mobile phone (like Galaxy S7, iPhone 9) in database and the size of data is about 3 million. We want to find the mobile phones that have the least call success rate ( the numbers of successful call divided by total call). We want to run a Regression model to find...
  2. M

    Regression of gender on income

    Genders are Male & Female Entrepreneur is given by dummy entrepreneur (1) Income is based in 16 groups (0-10k; 10k-20k; 20k-30k etcetera)? How can I approach this with an OLS method and for what should I test (correlation, homoskewdasticy etcetera)? I know that there are other factors and I...
  3. A

    Dummy variables and their interaction (urgent help required)

    Dear All, I have a question concerning the dummy and dummy interactions. Firm Performance is a continuous variable (variable of interest) and firms which offers different plans are categories as follows: Plan 1, Plan 2 and Plan 3 are dummy plans (reference category, zero plans). While...
  4. J

    Using a dummy variable to model threshold effects

    Hi All, I'm new to this thread and very green/inexperienced in using regressions. I'm trying to model threshold effects in a time series analysis - for instance, does an output hike of 5% or greater lead to a different effect on returns than when the output change is less than 5%. Given that I...
  5. M

    Logistic regression in SPSS

    I have designed a question and now intend to use SPSS to run regression to analyse the results: My dependent variable is: intention to vote. Yes or No. My independent variables are: a series of question ranked on a scale from strongly disagree to strongly agree. I want to test whether the...
  6. M

    Help with multiple dummy variable regression.

    I am attempting to forecast claim denials, whether it will ultimately be adjusted off or not. I am running all the data through excel. The information I have is what the denial was, which insurance denied, how much the initial charge was, and how much the adjustment was for. The problem I am...
  7. J

    PROC Means for dummy variables in SAS

    I have created a dummy variable in SAS, that in any given year takes the value 1 if both countries are members of the EMU and 0 otherwise in that year. emu1=0; if country1 in ("AUT","BEL","FIN","FRA","DEU","IRL","ITA","NLD","PRT","ESP") and year>1998 then emu1=1; if country1 in ("GRC") and...
  8. E

    Logistic regression using dummies with dependent "holes"

    Hi, I'm trying to do do a logistic regression using R. I want to regress using binary dependent variable Y as granted or not grated (1 or 0) using the model in the following way (just showing few covariates here): glm(Y ~ age + score + wage + employmenttype + co_person + co_score + ...
  9. F

    A question about whether dropping interaction terms as a whole or not

    Hello! I'm taking a regression course this semester and I have a question regarding when to drop the interaction terms. Suppose we have a regression model like this: Y = a + b1*X1 + b2*X2 + b3*X3 + b4*X1_X3 + b5*X2_X3 where Y is the response variable (say, the outcome of a disease), X1 and...
  10. D

    URGENT: Omitted Dummy Variable /// Multicollinearity

    Hi guys, i'm a complete newbie when it comes to statistically evaluating data for my thesis and would therefore very much appreciate your help. I have two questions: 1) My regression equation is including a vector of industrial dummy variables as independent variable (meaning three columns...
  11. P

    Model with discrete variables like step function

    I have some data and I want to use a model such as linear regression to describe the relationship between y and x. 2001 2002 2003 2004 2005 2006 2007 y: 0.1 0.4 0.2 0.5 0.8 0.9 0.2 x1: 0.4 0.4 0.4 0.4 0.5 0.5 0.5 x2: 0 0 0 0 0...
  12. K

    N needed comparing groups in linear regression with many covariates-do I have to few?

    I have two easy, but for me at this point rather devastating, questions I was hoping for one kind hearted or bright individual,or two, to reply on. I'm doing a study with data from a national representative population study. The design is cross-sectional. I've run into serious troubles with...
  13. D

    Multivariate timeseries regression - use of a dummy variable between two time periods

    Dear stat people I am doing an analysis on how the relation between Y and three explanatory variables change from one time period to the next. I guess using a dummy is an appropriate way to do this? I divide the time period into two subperiods, with monthly observation for 1990-2000 and...
  14. O

    Box cox - nonparametric?

    Hi, I have a major problem with the SPSS analysis I would like to conduct... Please, if anyone has an idea - its very much appreciated ;) Some background information: The plan was to do a multiple regression analysis with four independent variables and one dummy variable (capturing a...
  15. R

    Please advise: t-test for OLS dummy variable

    Hi. I need help. I'm writing a proposal and am not a statistician and am having trouble translating the notes from my professor into an equation. He said, after running my OLS twice, I will "test whether the estimated coefficient (beta) on the dummy variable for CCMI is statistically...
  16. I

    ask: no aid dummy in panel data using stata

    Dear all, I would like to ask the utilization of dummy variable in stata. Well, here is my model y=beta1 lnx1(1,x1)+beta2 nox1+beta3 lnx2 (1,x2)+beta4 nox2 so basically x1 and x2 are type of aid which given to countries. it is panel data 6 years long with 20 countries. i use the model...
  17. A

    Logistic regression with dummy variables and regular variables

    Hello. My logit regression for a sample of 182 has 4 significant explanatory variables. One of these variables is a dummy variable and the rest are regular ratio type data point variables. Given this, how do I interpret my grand mean and intercept term? And how do I interpret the coefficient...
  18. A

    Dummy variables in panel data.

    Hi I am working on a regression looking at income inequality pre and post financial crisis across G-7 countries between 1975-2006. I have included a dummy variable for banking crisis years in the 7 countries across this time period. I am wanting to add two more dummy variables for pre and...
  19. A

    Multivariate regression with sparse data for a few independent variables

    In my analysis I have several independent variables. My dataset has 2000 records but for a few variables the data is sparse, i.e., information is available only for about 200 records. When I include these variables the regression runs only on 200 records and I am effectively losing information...
  20. F

    Control for yearly effects

    Hi everybody, of course, I tried to find a thread with an answer about my topic. Unfortunately without success. I ran a multi regression analysis with 8 control variables and one explanatory variables to explain my dependent variable. The date is compiled between the years 1990 and 2000...