interval

  1. K

    Sum of questionnaire score - ordinal vs interval? and choosing an inference test

    Hello there, I'm doing a module in research methods and we are required to analyse some data (provided to us) from a randomised control trial. I'm having some difficulty deciding on what stats analysis to do... Background: the primary outcome measure is the sum of scores from a 36 item...
  2. H

    Is this an interval variable?

    The variable is called "externalizing behaviours" and it has the numbers 9,7,7,3,11,6,2,6,6,9. I assume that the numbers show the amount of externalizing behaviour because the question says it was an observation. Is this interval/ratio? I think it is interval (rather than ordinal) because 7 is...
  3. A

    Wilcoxon (SL) Regression - Confidence Intervals on Parameter Estimators?

    Does anyone know of a method to create confidence intervals on the SLR parameter estimates of a Wilcoxon Regression model?
  4. B

    measurement level of exponential temperature in degrees Celsius

    I was wondering about the following theoretical example. Assume that I have measured temperature in degrees Celsius on various days (x), and for some strange reason converted each of these using e^x. My question is now, what measurement level is this 'exponential temperature'? My own...
  5. T

    Ordinal or interval survey response analysis (from a convenience sample)

    I have the responses from a survey where people had to provide a rating on a scale from one to five, where five was most positive side of things. I would like to assume it is interval scale where the differences between each point on the scale are the same, as I would like to compute...
  6. G

    Error band for calibration correction of an instrument

    I apologize if this is the wrong area to post this. It seems like it could fall into a couple different areas. I have a question about calculating the expected error around a calibration curve for an instrument. I have a calibration curve for a load cell. It was measured at a few different...
  7. I'm-your-0

    I Need Help with Scale of Measurement

    I tend to over-think things, and there are multiple items within each part of an assignment I am doing. Any help would be greatly appreciated. :yup: Although I looked at a couple of websites, I am still confused about the "Alternate Uses Test." I need to identify it as a nominal, ordinal...
  8. K

    Confidence interval of mean of queue length (M/M/1)

    Goodday, For a simulation course I had to simulate a single server queue with Poisson processes for arrival and departure (M/M/1). Now, this really was not the issue, the issue is where I personally want to add a kind of validity check, which naturally can only be done with statistics. I...
  9. L

    Conditional change ordered logistic with different approach of same variable

    LS, I am working with two-wave panel data looking at outcomes of retirement on self-rated health (5 point scale, very good to very bad)). It is questionable to interpret this variable as interval/ratio, therefore I use ordered logistic regression (ologit in STATA). The results show significant...
  10. E

    Calculate Probability of a value greater than knowing the Mean, St Deviation...?

    I need to Calculate the probability of get 20000 or more with the following statistics; Statistics: Forecast values Trials 5,000 Base Case 0.00 Mean 14,755.75 Median 10,993.67 Mode --- Standard Deviation 10,519.67 Variance 110,663,505.00 Skewness 1.45 Kurtosis 4.40 Coeff. of...
  11. S

    On constructing 95% confidence ellipses for bivariate data in SAS - help!!

    Hi guys! I would very much like to plot / sketch / graph a 95% confidence ellipse using base SAS for a small data set I have, of size 9. I'm unsure of how to proceed. This is the two methods I tried to use without much success: proc princomp DATA=scores OUT=scores1 COVARIANCE...
  12. S

    confused about the class interval

    hey, first of all - im from germany, sry if my english is not perfect :) ive got a problem with the class intervals... a little example: A set of data consists of 230 observations between $235 and $567. What class interval would you recommend? So i would refer to the “2 to the k...
  13. T

    Simple Question. Prediction intervals in R.

    Hi, I'm using R and I've fitted a seasonal Arima model to a time series. I wish to compute a prediction for the next 12 values of the time series with 95% confidence interval. Can someone advise me what command to use? Also could someone point me to where I might find out the answers to similar...
  14. A

    Want to recode a logarithmic scale to linear

    I have a set of variables measured on an ordinal scale. The format is LIKERT ranging from 1 ("Daily") to 6 ("less than once a year"). I think it is OK to analyze the data as interval scale data, then being able to use parametric tests. The underlying scale is logarithmic, meaning that 1 is...