Talk to your counterparts at similar institutions to see what theyre using, or see what is discussed at your next conference, or in internet discussion groups in your field.
This reduces the overall size of your dataset and makes it easier to share with others in the organization who can leverage it for their own insights.
Formula a formula, such as y x or cbind(y1, y2) x1 x2, where the y variables are numeric data to be split into groups according to the grouping x variables (usually factors).IQ.17 rating.667 sapply(myDf1, c age "IQ "rating range) age IQ rating køn gerningsmanden registreringsdatabasen oregon state police 1, (numIdx - sapply(myDf1, meric) id sex group age IQ rating true false false true true true dataNum - myDf1, numIdx head(dataNum) id age IQ rating N - 100.The idea is to add the value to the existing dataset, instead of reducing the size of the data file, which is the purpose of the roll up tool.Ame is the data frame method.Ndeltat new fraction of the sampling period between successive observations; must be a divisor of the sampling interval.Rows with missing values in any of the by variables will be omitted from the result.See Also apply, lapply, tapply.The elements are coerced to factors before use.Trifactas Data Wrangler, include: Roll-up or summary tools, which calculate summaries and report only those.Keywords array, category, usage aggregate(x, ) # S3 method for default aggregate(x, ) # S3 method for ame aggregate(x, by, FUN, simplify true, drop true) # S3 method for formula aggregate(formula, data, FUN, subset, tion it) # S3 method for ts aggregate(x, nfrequency 1, FUN.
Data aggregation tools allow you to look beyond the two dimensionality of a row and column tool like Excel.
Must Haves In Data AggregationIt Depends on You.Here are a few things to keep in mind: When Is It Time To Do Data Aggregation?(Note that versions of R prior.11.0 required FUN to be a scalar function.) rmula is a standard formula interface to ame.X77 Frost" 130 mean) # (Note that no state in 'South' is that cold.) # example with character variables and NAs testDF - ame(v1 c(1,3,5,7,8,3,5,NA,4,5,7,9 v2 ) by1 - c red "blue 1, 2, NA, "big 1, 2, "red 1, NA, 12) by2 -.Post a new example.FUN is passed to match.Splits the data into subsets, computes summary statistics for each, and returns the result in a convenient form.Intermediate calculation tools, which allow you to calculate a value based on an aggregation and include that value in the dataset.(1988) The New S Language.Disqus terms of service.
R markdown - markdown - R code - all posts top.
But choosing from the growing list of data aggregation tools is a challenge for even the most motivated decision-maker.
Compute Summary Statistics of Data Subsets.