What I would like to do is compute confidence intervals at the 95% for these headline survey figures and see do the median and mean income values taken from the administrative records fall within the confidence intervals set out from the survey. 95% CI for means : direct output from proc means is different to calculated, Re: 95% CI for means : direct output from proc means is different to calculated. Now I don't feel confused any more. This will get a narrower 95% CI for the mean compared to proc means or proc summary. Re: difference between two medians - 95% CI Posted 01-05-2017 08:15 AM (3769 views) | In reply to Rick_SAS yes, but it does not provide the 95% confidence interval for the … you can copy and paste the URL and it works. In reality, which method is more often used? The 95% confidence interval for the difference does not include 0, therefore the difference is statistically significant. For example, Output 4.9.1 shows that the 95% confidence interval for the population mean is. the author said that to get the 95% CI of the mean, it is the best to get N , Mean and Stdeer and use TINV function to calculate. No other SAS procedure provides that level of … Find more tutorials on the SAS Users YouTube channel. The calculation happening is for a 90% confidence interval, not 95%. In this paper http://www.lexjansen.com/pharmasug/2003/Posters/P048.pdf. The reply is strictly speaking still incorrect in the code , as you state your going to use proc summary, but in fact you've repeated proc means twice. sign in and ask a new question. To be clear, percentiles and quantiles are essentially the same thing. Anyways, the paper is wrong - it's doing alpha=0.1 not alpha=0.05. Once everything is the same the numbers from proc means match. By changing the value of the QUANTILE= option, you can compare quantiles other than the median. However, in SAS 9.3M2 (featuring the 12.1 analytical procedures) you can use a new feature in PROC UNIVARIATE to compute confidence intervals for a specified list of percentiles. This will get a narrower 95% CI for the mean compared to proc means or proc summary. To begin, thank you for your answers.. @ballardw : I used kruskal-Wallis one-way analysis with Dunn's post-tests and i presented the data with median and IQR in the paper.The reviewers asked me to describe data with median differences and 95%CI between groups. Auto-suggest helps you quickly narrow down your search results by suggesting possible matches as you type. PROC MEANS and SUMMARY are interchangeable in this context. If you’re ready for career advancement or to showcase your in-demand skills, SAS certification can get you there. Mathematical Optimization, Discrete-Event Simulation, and OR, SAS Customer Intelligence 360 Release Notes, http://www.lexjansen.com/pharmasug/2003/Posters/P048.pdf. The CIBASIC option requests confidence limits for the mean, standard deviation, and variance. I fixed it, but may have overridden yours. Please He said :"generally it is not helpful to refer to a "statistical difference". Look at the 95% in the TINV function, for a two sided test it should 1-alpha/2 = 0.975 NOT 0.95. I know that SAS is using the following formula to calculate the confidence interval for the median: *abs(g(S(t))-g(1-0.5)/g'(S(t))σ(S(t)))<=1.96* with g'(x) being the first derivative of g(x) and σ(S(t)) is the standard error of … The information which is given by interviews is used to complie headline figures on median income of the sample and mean income. Example 4.10 Computing Confidence Limits for Quantiles and Percentiles. Look in the online help for "Keywords and Formulas" in the SAS Elementary Statistic Procedures. How did Proc Means or proc summary calculate the 95% CI for the mean? How did Proc Means or proc summary calculate the 95% CI for the mean? I have been trying to replicate the results of proc lifetest in SAS using R (survival package and survifit function) -and especially calculate the 95%Confidence interval for the median survival time. the author said that to get the 95% CI of the mean, it is the best to get N , Mean and Stdeer and use TINV function to calculate. The ODS SELECT statement restricts the output to the "BasicIntervals" table; see the section ODS Table Names. Tune into our on-demand webinar to learn what's new with the program. In reality, which method is more often used? I wonder if this alternative is for a specific purpose but can't check as the link doesn't seem to work, at least for me. Need further help from the community? Learn how to run multiple linear regression models with and without interactions, presented by SAS user Alex Chaplin. Thank you for pointing out the mistake in the paper. This example, which is a continuation of Example 4.9, illustrates how to compute confidence limits for quantiles and percentiles.A second researcher is more interested in summarizing the heights with quantiles than the mean and standard deviation.