variables

  1. L

    Which test should I use for multiple variables, multiple sites & non-parametric data?

    Hi All, I've spent the past two weeks trying to figure out which test to use and have gotten nowhere so hoping someone here can help! I have been given data for 4 sites, where the percentages were recorded for a number of variables, including leaf litter cover, rhododendron cover, light...
  2. B

    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 Alloy wheels* Transmission* Number of seats Number of doors Driven wheels (front, rear or 4x4) Maximum speed 0-62mph Fuel type* Fuel capacity...
  3. T

    Comparing 3 Variables Drug trial what tests to do?

    I have been given a data set of 3 groups, 20 patients ine each measuring for drugA, drugB and placebo. with the effect of the drug in numerical form-> Here is my data set: Treatment Change.in.systolic 1 Placebo -1.26 2 Placebo -2.39 3 Placebo...
  4. R

    Variable and Dataset Confusion

    I have imported an Excel spreadsheet into SAS as WORK.X1. I am trying these lines: proc freq data = x1 ; data x2 ; PhysicalAggression = (Aggress9 + Aggress10 + Aggress11 + Aggress12) /4 ; run; The log tells me that the Aggress variables are uninitialized. I guess this means that the...
  5. S

    Combining two scales into one

    Hello! I am trying to merge two scales into one; one measures maternal warmth and the other measures paternal warmth. I have tried to simply add the two variables together in the "compute variable" tab. However, when looking at the frequencies of this variable, I lose almost half of the...
  6. K

    Saving regression results into a variable

    I have time-series data for many countries on exchange rate, consumer price index and interest rate. Now I need for further analysis to save regression results in variables. What I do: For each country regress changes in exchange rate to changes in CPI and real interest rate bysort...
  7. H

    Trying to display 3+ scaled variables in one table

    SPSS TABLES: Trying to display 3+ scaled variables in one table Hello, I've been trying to display 3 variables that use the same scale with the same value labels in one table in SPSS V19 and have been unsuccessful. example: Q1. On a scale of 1 to 5 how satisfied are you with your ISP...
  8. S

    Multiple Regression Number of Variables and Predictors?

    Hi Could someone please help me with this question I've been staring at my textbook for hours and it doesn't explain how to find no of variable or predictors.. A researcher gathered 155 observations on four variables: job satisfaction, occupation, industry, and marital status. She wants to...
  9. R

    Xtlogit, fe : huge drop in variables

    Hello, I'm estimating happiness levels of working women based on their career and marital aspects: xtlogit happy jbsat_all jbsat_hrs finance chsee married##numchild if (fworking==1), fe Where fworking is number of working females. Initially, my sample has about 53k observations...
  10. R

    How to tell SPSS what missing values are?

    I have imported a dataset into SPSS from Excel. In the Excel file, not all cells contained a value (=missing value). Once imported into SPSS, those cells now contain a dot (.), as follows: VAR_X VAR_Y VAR_Z ------------------------ 5,6384 5,9269 . . 5,6384 . 6,0186 5,6168...
  11. D

    Ancova : A specialised model

    Hi all, I have a cross sectional data obtained from two independent groups. I have just made a logarithmic transformation of the outcome variable because it was not normally distributed. May I confirm if I can still use ANCOVA to analyze the data in this mode please: One dependent variable...
  12. S

    Dependent and independent variables

    Hey guys. I'm doing my masters and I'm trying to get the hang of statistics in social sciences. I have this one data set, where I'm looking at the relationship between different types of jobs and after-education in the different job types (yes/no). It's then I get a little confused. As far...
  13. G

    [JMP 9] Manova with controlling variables

    Hi there, Where (in which box) do I add control variables running a Manova (fit model) in JMP 9? Thank you gav
  14. L

    Factor Analysis

    I'm trying to run a Factor Analysis on a large environmental data set with a combination of data types, and i'm having some difficulties. I get a Warning message listing a number of possibilities of what could have gone wrong. One option is that I have variables with zero variance. i've run a...
  15. R

    Transforming Variables

    I have several different variables. The majority of the variables were positively skewed and therefore I did a log10 transformation to make them more normal. However, two of the variables were quite normal already and now after log10 are more negatively skewed. In order for me to do some...