## 如何计算总量表？内容来源于 Stack Overflow，并遵循CC BY-SA 3.0许可协议进行翻译与使用

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``````onset.types <- ftable(SAB\$Onset,SAB\$MRSA.Type,year(SAB\$Collection.Date))
2005 2006 2007 2008 2009 2010

Community                     454  472  512  499  525  512
AUS-2/3-like         28   23   27   29   32   38
EMRSA-15-like         9    4    4    9    8    8
nmMRSA               40   47   53   39   64   60
Other mMRSA           1    3    3   11    5    9
unclassified MRSA     0    2    0    0    1    1
Hospital                      163  163  156  164  149  165
AUS-2/3-like         31   33   27   31   29   28
EMRSA-15-like         3    8    5    9    4    3
nmMRSA               10    9   13   17   13   12
Other mMRSA           5    1    6    2    3   10
unclassified MRSA     2    0    1    0    0    0
``````

1：我将如何计算边际总额

2：是否有一个简单的方法来计算百分比以及再次计算边际总量

```addmargins(table(state.division, state.region))
state.region
state.division       Northeast South North Central West Sum
New England                6     0             0    0   6
Middle Atlantic            3     0             0    0   3
South Atlantic             0     8             0    0   8
East South Central         0     4             0    0   4
West South Central         0     4             0    0   4
East North Central         0     0             5    0   5
West North Central         0     0             7    0   7
Mountain                   0     0             0    8   8
Pacific                    0     0             0    5   5
Sum                        9    16            12   13  50```

```prop.table(table(state.division, state.region))
state.region
state.division       Northeast South North Central West
New England             0.12  0.00          0.00 0.00
Middle Atlantic         0.06  0.00          0.00 0.00
South Atlantic          0.00  0.16          0.00 0.00
East South Central      0.00  0.08          0.00 0.00
West South Central      0.00  0.08          0.00 0.00
East North Central      0.00  0.00          0.10 0.00
West North Central      0.00  0.00          0.14 0.00
Mountain                0.00  0.00          0.00 0.16
Pacific                 0.00  0.00          0.00 0.10```

Eli Qiao

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