*Hi all,
I know this is probably basic, but I have proven to be a slow learner in any
programming language. Anyhow,
how can I calculate the SD for each person in my table? I have two patients
in this R data.frame, 7200 and 23955.
I extracted this from a relational database, but am I better off attempting
to compute SD in SQL, or is this easily accomplished in R?
* SUBJECT_ID HR
1 7200 158
2 7200 165
3 7200 138
4 7200 152
5 7200 139
6 7200 157
7 7200 186
8 23955 167
9 23955 162
10 23955 171
11 23955 139
12 23955 170
13 23955 177
14 23955 180
15 23955 176
16 23955 172
17 23955 179
18 23955 181
19 23955 169
20 23955 168
21 23955 185
22 23955 181
23 23955 191
24 23955 179
25 23955 178
26 23955 184
27 23955 179
28 23955 172
29 23955 173
30 23955 182
31 23955 174
*
So, what I would want is a table of 800 patients with a SD for their heart
rates:
subject id Heart Rate SD
7200 20 (for example)
23955 18 (for example)*
Thank you!
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