04-19-2017
JJBDubois
Fluorite | Level 6
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06-28-2016
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Latest posts by JJBDubois
Subject Views Posted 2968 04-19-2017 12:03 PM 2831 04-04-2017 04:28 PM 2869 04-03-2017 05:57 PM 1093 09-06-2016 04:14 PM 1097 09-06-2016 04:09 PM -
Activity Feed for JJBDubois
- Posted Re: regression with binned (interval) data on Statistical Procedures. 04-19-2017 12:03 PM
- Posted Re: regression with binned (interval) data on Statistical Procedures. 04-04-2017 04:28 PM
- Posted regression with binned (interval) data on Statistical Procedures. 04-03-2017 05:57 PM
- Posted Re: Control ordering of categories when values are formatted - SGPLOT/SGPANEL on Graphics Programming. 09-06-2016 04:14 PM
- Posted Control ordering of categories when values are formatted - SGPLOT/SGPANEL on Graphics Programming. 09-06-2016 04:09 PM
04-19-2017
12:03 PM
Since the situation described can be viewed as a matter of interval censoring, UCLA's Institute for Digital Research and Education statistics resources suggest using PROC LIFEREG. http://stats.idre.ucla.edu/sas/dae/interval-regression/ The original suggestion can be found on page 145-146 of one of that article's citations: Long, J. S. 1997. Regression Models for Categorical and Limited Dependent Variables. Thousand Oaks, CA: Sage Publications.
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04-04-2017
04:28 PM
Thank you. I never think of logistic regression. I won't be able to state something like this, though: "every 1 gram increment in weight is associated with a $26.43 increase in price", as I would if the price data had been recorded exactly and I used linear regression. Or am I not realising something?
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04-03-2017
05:57 PM
I often have to analyze data where the dependent, independent, or both variables were recorded in bins (intervals), when they really should have been recorded as continuous. Most of the time, the intervals are not even equal, and the highest is unbounded. For example price of an item= $0-20, $21-100, $101-500, $501-5000, $5001 and up. Say that price is a function of weight of the item, which is measured exactly to the nearest gram. Maybe these are truffles... What is the best way to salvage this situation, and build a regression model of price as a function of weight? Rick Wicklin has some posts that seem close to this, such as http://blogs.sas.com/content/iml/2013/04/17/quantile-regression-vs-binning.html , but I am unsure. Looking forward to all suggestions!
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09-06-2016
04:14 PM
Thank you for the very quick answer. Are you saying that DISCRETEORDER=DATA will order my formatted values according to the values of the underlying unformatted variable?
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09-06-2016
04:09 PM
I am using vertical bars in SGPANEL. The categories are given by an underlying numerical value (acreage), which I formatted to create five meaningful categories ('very small, small, medium, large, very large). Accordingly, my graphs each have 5 bars. SGPANEL arranges them left-to-right alphabetically: large-medium-small-very large-very small. How could I order them as intended, left to right: very small-small-medium-large-very large. All I have manged is adding a prefix a, b, c, d, e to each, which works, but looks distracting. (Version 9.4) Looking forward to a solution.
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