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help for ^stfracp^                                     (STB-43: sg82)
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Fractional polynomial Cox proportional hazards models
-----------------------------------------------------


   ^stfracp^ [varlist] [^if^ exp] [^in^ range] [, stcox_options fracpoly_options ]

   ^stmfracp^ [varlist] [^if^ exp] [^in^ range] [, stcox_options mfracpol_options ]


^stfracp^ and ^stmfracp^ are for use with survival-time data; see help @st@.
You must have ^stset^ your data before using this command; see help @stset@.

^stfracp^ and ^stmfracp^ share the features of all estimation commands;
see help @est@.

To reset problem-size limits, see help @matsize@.


Description
-----------

^stfracp^ and ^stmfracp^ estimate fractional polynomial proportional hazards
models. ^stfracp^ estimates models with a single fractional polynomial
transformation, whereas ^stmfracp^ estimates multivariable fractional polynomial
models.


Options
-------

stcox_options are any of the options for @cox@ except those for defining st data
    by using @stset@.

fracpoly_options are any of the options for @fracpoly@.

mfracpol_options are any of the options for @mfracpol@.


Remarks
-------

^stfracp^ and ^stmfracp^ supply Stata with the necessary information to run
@fracpoly@ or @mfracpol@ with the @cox@ command. They are therefore convenience
tools.


Examples
--------

The commands

 . ^stset time cens^
 . ^stfracp x1, strata(z)^
 . ^stmfracp x1 x2, strata(z) select(0.05)^

are equivalent to

 . ^fracpoly cox time x1, dead(cens) strata(z)^
 . ^mfracpol cox time x1 x2, dead(cens) strata(z) select(0.05)^


Author
------

     Patrick Royston
     Imperial College School of Medicine, UK
     proyston@@rpms.ac.uk


Also see
--------

    STB:  STB-43 sg82
 Manual:  ^[R] st stcox^
	  ^[R] fracpoly^
On-line:  help for @st@, @sts@, @fracpoly@, @mfracpol@