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String comparisons in SAS software are case-sensitive.For example, the uppercase letter "F" and lowercase letter "f" are treated as unique characters.

Well-managed data in Stata generally have the following properties: Under the Syntax section will typically be a listing and description of options available for the command. Let’s replace all ages outside of the range [18,120] with missing value Often, examining how variables are missing together can help the researcher understand the reasons for missing. | .9088714 8.030203 7.226128 yes former 0 | |----------------------------------------------------------------| 6. To demonstrate, we will use the egen family_smoking = group(familyhx smokinghx), label (16 missing values generated) tab family_smoking, miss group(famil | yhx | smokinghx) | Freq. ------------ ----------------------------------- no current | 30 13.39 13.39 no former | 30 13.39 26.79 no never | 111 49.55 76.34 yes current | 11 4.91 81.25 yes former | 12 5.36 86.61 yes never | 14 6.25 92.86 . In the is checking for matches to a number “[0-9]”, followed by a “-“, followed by 1 or more numbers “([0-9] )”. desc stage storage display value variable name type format label variable label ------------------------------------------------------------------------------------- stage long %8.0g stage Cancer Stage tab cancerstage stage, nolab Cancer Stag | Cancer Stage e | 1 2 3 4 | Total ----------- -------------------------------------------- ---------- I | 60 0 0 0 | 60 II | 0 99 0 0 | 99 III | 0 0 38 0 | 38 IV | 0 0 0 27 | 27 ----------- -------------------------------------------- ---------- Total | 60 99 38 27 | 224 Sometimes, variables with number values are loaded as strings into Stata.

All code for this seminar is available here — copy and paste into the Stata do-file editor or right-click to download. See Often we work with datasets where certain extreme numeric values are used to represent missing values, such as -99 or 999. Note that the first group in the categorical variable is represented by 0, the second 1, the third 2, etc. The numeric version of the variable can either be a new variable, using option encode cancerstage, gen(stage) tab cancerstage stage Cancer Stag | Cancer Stage e | I II III IV | Total ----------- -------------------------------------------- ---------- I | 60 0 0 0 | 60 II | 0 99 0 0 | 99 III | 0 0 38 0 | 38 IV | 0 0 0 27 | 27 ----------- -------------------------------------------- ---------- Total | 60 99 38 27 | 224 The table above looks a bit odd, since it seems that we have tabulated the same variable, Cancer Stage, twice.

This seminar covers Stata commands and methods to prepare data for statistical analysis. Undetected, these missing data codes can be included as real data in statistical analysis, greatly distorting results. Min Max ------------- --------------------------------------------------------- hospital | 0 hospid | 224 2.209821 .8394382 1 3 docid | 0 dis_date | 224 18306.74 192.6187 17743 18809 tumorsize | 224 69.78098 11.76117 38.67265 109.0096 ------------- --------------------------------------------------------- co2 | 224 -2.832827 20.61865 -98 2.047362 pain | 224 5.379464 1.568675 1 9 wound | 224 5.65625 1.551119 2 9 mobility | 224 5.9375 1.745108 2 9 ntumors | 224 3.357143 2.688148 0 9 ------------- --------------------------------------------------------- nmorphine | 117 3.376068 2.744042 0 13 remission | 224 .28125 .4506162 0 1 lungcapacity | 224 -18.33162 39.29377 -99 .9982018 age | 224 52.95722 21.45249 34.19229 357.89 married | 224 .6071429 .4894793 0 1 ------------- --------------------------------------------------------- familyhx | 0 smokinghx | 0 sex | 0 cancerstage | 0 lengthofstay | 224 5.419643 1.121645 3 9 ------------- --------------------------------------------------------- wbc | 0 rbc | 224 4.993808 .266146 4.177896 5.660488 bmi | 224 28.60466 6.43512 18.44991 58 test1 | 224 -3.683989 27.53701 -99 23.72776 test2 | 224 -2.795368 27.8277 -99 19.94562 ------------- --------------------------------------------------------- experience | 217 19.11521 4.611841 9 27 school | 0 lawsuits | 217 1.852535 1.486484 0 5 medicaid | 217 .523119 .2085848 .1415814 .8187299 _merge | 224 2.9375 .3487646 1 3 ------------- --------------------------------------------------------- dup | 224 .03125 .1743823 0 1 We see suspicious codes -98 and -99 in the variables co2, lungcapacity, test1, and test2. Notice that we do not get summaries for string variables. ------------ ----------------------------------- -99 | 16 7.14 7.14 current | 41 18.30 25.45 former | 42 18.75 44.20 never | 125 55.80 100.00 ------------ ----------------------------------- Total | 224 100.00 tab familyhx, miss Family Hx | Freq. ------------ ----------------------------------- -99 | 16 7.14 7.14 no | 171 76.34 83.48 yes | 37 16.52 100.00 ------------ ----------------------------------- Total | 224 100.00 mvdecode _all, mv(-99) hospital: string variable ignored docid: string variable ignored lungcapacity: 33 missing values generated familyhx: string variable ignored smokinghx: string variable ignored sex: string variable ignored cancerstage: string variable ignored wbc: string variable ignored test1: 17 missing values generated test2: 17 missing values generated school: string variable ignored tab familyhx, miss Family Hx | Freq. ------------ ----------------------------------- | 16 7.14 7.14 no | 171 76.34 83.48 yes | 37 16.52 100.00 ------------ ----------------------------------- Total | 224 100.00 tab smokinghx, miss Smoking Hx | Freq. ------------ ----------------------------------- | 16 7.14 7.14 current | 41 18.30 25.45 former | 42 18.75 44.20 never | 125 55.80 100.00 ------------ ----------------------------------- Total | 224 100.00 Finally, we noticed a likely data error for age, 357.89. We can see this with tab bmi_cat, nolabel bmi_cat | Freq. ------------ ----------------------------------- 2 | 1 0.45 0.45 3 | 77 34.38 34.82 4 | 72 32.14 66.96 5 | 38 16.96 83.93 6 | 26 11.61 95.54 7 | 10 4.46 100.00 ------------ ----------------------------------- Total | 224 100.00 is to create a variable that crosses the groups of multiple input variables. We will not go into the details of regular expression syntax in this seminar. However, the command executed without error — so what happened?

The UPCASE function is part of Base SAS software, and functions in Base SAS software can be called from SAS/IML software.

If you call UPCASE on a SAS/IML matrix, the function converts every element in the matrix to uppercase.

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Upon merging files, Stata generates a new variable, _merge, which equals: Inadvertently duplicated observations can be hard to spot in a visual inspection of the data, particularly if there is no unique ID for each observation or the dataset is large.

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