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POWhy does str() show incorrect info for factor levels after creating a sub-matrix in R?
 

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  1. POWhy does str() show incorrect info for factor levels after creating a sub-matrix in R?
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    <p>I have the following data frame in R with 274569 rows and 15 columns:</p> <pre><code>&gt; str(x2) 'data.frame': 274569 obs. of 15 variables: $ ykod : int 99 99 99 99 99 99 99 99 99 99 ... $ yad : Factor w/ 43 levels "BAKUGAN","BARBIE",..: 2 2 2 2 2 2 2 2 2 2 ... $ per : Factor w/ 3 levels "2 AYLIK","3 AYLIK",..: 3 3 3 3 3 3 3 3 3 3 ... $ donem: int 201106 201106 201106 201106 201106 201106 201106 201106 201106 201106 ... $ sayi : int 201106 201106 201106 201106 201106 201106 201106 201106 201106 201106 ... $ mkod : int 359 361 362 363 366 847 849 850 1505 1506 ... $ mad : Factor w/ 11045 levels " Hilal Gida ",..: 5163 3833 10840 8284 10839 2633 10758 10293 6986 6984 ... $ mtip : Factor w/ 30 levels "Abone Bürosu ",..: 20 20 20 20 20 2 2 2 11 11 ... $ kanal: Factor w/ 2 levels "OB","SS": 2 2 2 2 2 2 2 2 1 1 ... $ bkod : int 110006 110006 110006 110006 110006 110006 110006 110006 110006 110006 ... $ bad : Factor w/ 213 levels "4. Levent","500 Evler",..: 25 25 25 25 25 25 25 25 25 25 ... $ bolge: Factor w/ 12 levels "Adana Şehiriçi",..: 7 7 7 7 7 7 7 7 7 7 ... $ sevk : int 5 2 2 2 10 0 4 3 13 32 ... $ iade : int 0 2 1 2 4 0 3 2 0 8 ... $ satis: int 5 0 1 0 6 0 1 1 13 24 ... </code></pre> <p>I create a sub-matrix and display its structure:</p> <pre><code>&gt; msub &lt;- x2[x2$ykod == 99,] &gt; str(msub) 'data.frame': 14367 obs. of 15 variables: $ ykod : int 99 99 99 99 99 99 99 99 99 99 ... $ yad : Factor w/ 43 levels "BAKUGAN","BARBIE",..: 2 2 2 2 2 2 2 2 2 2 ... $ per : Factor w/ 3 levels "2 AYLIK","3 AYLIK",..: 3 3 3 3 3 3 3 3 3 3 ... $ donem: int 201106 201106 201106 201106 201106 201106 201106 201106 201106 201106 ... $ sayi : int 201106 201106 201106 201106 201106 201106 201106 201106 201106 201106 ... $ mkod : int 359 361 362 363 366 847 849 850 1505 1506 ... $ mad : Factor w/ 11045 levels " Hilal Gida ",..: 5163 3833 10840 8284 10839 2633 10758 10293 6986 6984 ... $ mtip : Factor w/ 30 levels "Abone Bürosu ",..: 20 20 20 20 20 2 2 2 11 11 ... $ kanal: Factor w/ 2 levels "OB","SS": 2 2 2 2 2 2 2 2 1 1 ... $ bkod : int 110006 110006 110006 110006 110006 110006 110006 110006 110006 110006 ... $ bad : Factor w/ 213 levels "4. Levent","500 Evler",..: 25 25 25 25 25 25 25 25 25 25 ... $ bolge: Factor w/ 12 levels "Adana Şehiriçi",..: 7 7 7 7 7 7 7 7 7 7 ... $ sevk : int 5 2 2 2 10 0 4 3 13 32 ... $ iade : int 0 2 1 2 4 0 3 2 0 8 ... $ satis: int 5 0 1 0 6 0 1 1 13 24 ... </code></pre> <p>Now I have a sub-matrix with 14367 rows and 15 columns, but the levels of factors are still there. They should have been decreased. For example, for <code>yad</code>, there should be only one factor.</p> <p>How can I <em>easily</em> make str() to show correct info for factor levels so that when I type <code>str(msub)</code> it gives me correct values?</p>
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    1. USMehper C. Palavuzlar
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    1. COAs the answers demonstrate, `str` is in fact giving you the correct information. However, working with factors in data.frames are often confusing. Consider using `stringsAsFactors=FALSE` in your original call to `read.table` or `read.csv` to import the data.
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