Statistics Help @ Talk Stats Forum - Statistics
http://www.talkstats.com/
Statistics course and homework discussion. Elementary statistics.enFri, 24 Oct 2014 23:47:23 GMTvBulletin60http://www.talkstats.com/images/misc/rss.pngStatistics Help @ Talk Stats Forum - Statistics
http://www.talkstats.com/
parameter estimation based on observed survival probabilities
http://www.talkstats.com/showthread.php/58193-parameter-estimation-based-on-observed-survival-probabilities?goto=newpost
Fri, 24 Oct 2014 21:38:32 GMTSay 100 samples have been pulled from a Normal distribution with unknown mean and variance. All I know about the results are the following:
• 23...Say 100 samples have been pulled from a Normal distribution with unknown mean and variance. All I know about the results are the following:

• 23 out of 100 are greater than 200
• 9 out of 100 are greater than 300
• 2 out of 100 are greater than 400

How would I find the best estimate of the mean and SD of the distribution based on this information?

Thanks in advance!
]]>Statisticsschleprockhttp://www.talkstats.com/showthread.php/58193-parameter-estimation-based-on-observed-survival-probabilitiesMissing Values with Count Data
http://www.talkstats.com/showthread.php/58190-Missing-Values-with-Count-Data?goto=newpost
Fri, 24 Oct 2014 19:43:09 GMTSo, I have a question that I cannot figure out. I've looked in the literature and can't really find a solution. Maybe I'm looking in the wrong place, but could use some direction.

I have an outcome variable that is a count (i.e. # of deaths). There is missing data that I would like to address. However, the solutions I typically use (maximum likelihood or multiple imputation) produce values that are not an integer. A negative binomial regression requires an integer.

Is there a technique that anyone is aware of that I can use to replace missing values that will result in an integer? As a long shot, would it be acceptable to round the non-integers to integers?

Thanks!

Dave
]]>Statisticsmuelledghttp://www.talkstats.com/showthread.php/58190-Missing-Values-with-Count-Datacalculating probability of disease according to age
http://www.talkstats.com/showthread.php/58175-calculating-probability-of-disease-according-to-age?goto=newpost
Thu, 23 Oct 2014 21:08:30 GMTI'm making a program which, at one point, is supposed to estimate the probability of having a certain disease based on the patient's age. I'm going to feed the mean age at which the disease occurs, along with the standard deviation, into the program, but I can't figure out how to actually calculate the probability. I've been reading for a while now about probability, cumulative probability, normals, and standards, and I'm all lost.

For instance, let's say the mean age for having a heart attack in men is 58 years, with a standard deviation of ±15 years. Now if I have a 37 year old man for example, how can I calculate the probability of him having a heart attack?

Please keep in mind that I am neither a statistician nor a statistics student, so go really easy on me!
]]>Statisticsjustryhttp://www.talkstats.com/showthread.php/58175-calculating-probability-of-disease-according-to-age