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From |
"Nick Cox" <n.j.cox@durham.ac.uk> |

To |
<statalist@hsphsun2.harvard.edu> |

Subject |
RE: st: RE: kappa command: select raters with complete data |

Date |
Sat, 5 Sep 2009 17:10:28 +0100 |

Typo fix: local OKlist `OKlist' `V' Nick n.j.cox@durham.ac.uk -----Original Message----- From: owner-statalist@hsphsun2.harvard.edu [mailto:owner-statalist@hsphsun2.harvard.edu] On Behalf Of Nick Cox Sent: 05 September 2009 16:56 To: statalist@hsphsun2.harvard.edu Subject: RE: st: RE: kappa command: select raters with complete data Evidently I didn't read your post carefully enough. It's best to stick to Stata terminology in posing Stata questions (e.g. in Stataspeak variables always and only means columns). There are plenty of words Stata hasn't claimed, e.g. properties. An orthogonal solution to my previous goes something like this: count local N = r(N) local OKlist foreach v of var rater* { qui count if !missing(`v') if r(N) == `N' { local OKlist `OKlist `V' } } kap `OKlist' Here is a pseudocode translation count the number of observations N <- result of count Initialise the list of OK variables to empty cycle over variables { count how many non-missing values in that variable if result equals N { add that variable to the list of OK variables } } work with OKlist This code could be specialised e.g. to apply _only_ to obs 1-49: count in 1/49 local N = r(N) local OKlist foreach v of var rater* { qui count if !missing(`v') in 1/49 if r(N) == `N' { local OKlist `OKlist `V' } } It would be possible to count missings as well, and include any variable only if none were present. On the useful simplicity of -count-, see SJ-7-4 dm0033 . . . . . . Speaking Stata: Counting groups, especially panels . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . N. J. Cox Q4/07 SJ 7(4):571--581 (no commands) discusses how to count panels through reduction commands or through tabulation commands and how to overcome problems that do not yield easily to these approaches SJ-7-1 pr0029 . . . . . . . . . . . . . . . Speaking Stata: Making it count . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . N. J. Cox Q1/07 SJ 7(1):117--130 (no commands) discusses count used with a loop over observations or variables Nick n.j.cox@durham.ac.uk Frank Gallo Thank you very much for the reply and the excellent reference. Let me start my response with I am a stata beginner. The organization of my data table is rows (of variables) and columns (of raters). So your syntax creates a rowmiss, which gives the count of missing values across variables. What I want to do is exclude the raters (or columns) that have missing values on variables (or rows) when calculating kap. For example, I have 94 raters: rater1-rater94 columns. I have 49 variables: p1-p49 rows. If only rater1 and rater2 had missing values on variables p1-p49, then I would want to exclude them from kap so that I could calculate the test statistics. I do not want to drop them from the data, though, because I have other variables such as r1-r15 for which rater1 and rater2 gave complete ratings. Simply, I want to use the set of raters with complete ratings for the variables. I greatly appreciate any comments. Thank you. On Sep 4, 2009, at 1:40 PM, Nick Cox wrote: egen rowmiss = rowmiss(rater*) kap rater* if rowmiss == 0 See for a broader discussion SJ-9-1 pr0046 . . . . . . . . . . . . . . . . . . . Speaking Stata: Rowwise (help rowsort, rowranks if installed) . . . . . . . . . . . N. J. Cox Q1/09 SJ 9(1):137--157 shows how to exploit functions, egen functions, and Mata for working rowwise; rowsort and rowranks are introduced Frank Gallo I am running the kap command, and I want to limit the analysis to the raters that gave complete ratings for a set of objects (or variables). The data matrix is in the form of columns(raters) and rows(variables). For example: kap rater1-rater94 if rater1-rater94 != . in 1/49 I know this "does not equal missing" designation here is incorrect, but it illustrates what I want to do and where I am stuck. * * For searches and help try: * http://www.stata.com/help.cgi?search * http://www.stata.com/support/statalist/faq * http://www.ats.ucla.edu/stat/stata/

**Follow-Ups**:**RE: st: RE: kappa command: select raters with complete data***From:*"Nick Cox" <n.j.cox@durham.ac.uk>

**References**:**st: kappa command: select raters with complete data***From:*Frank Gallo <fjgallo@mac.com>

**st: RE: kappa command: select raters with complete data***From:*"Nick Cox" <n.j.cox@durham.ac.uk>

**Re: st: RE: kappa command: select raters with complete data***From:*Frank Gallo <fjgallo@mac.com>

**RE: st: RE: kappa command: select raters with complete data***From:*"Nick Cox" <n.j.cox@durham.ac.uk>

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