limits.hlp

是一个经济学管理应用软件 很难找的 但是经济学学生又必须用到

{smcl}
{* 29mar2005}{...}
{cmd:help limits}
{hline}

{title:Maximum size limits}

					  Small    Intercooled       {help SpecialEdition:Stata/SE}
{hline}
   # of observations  (1)           about 1,000  2,147,483,647  2,147,483,647
   # of variables                            99          2,047         32,767
   width of a dataset                       200         24,564        393,192

   value of {helpb matsize}                          40            800         11,000

   # characters in a command              8,697         67,800      1,081,527
   # options for a command                   70             70             70

   # of elements in a {it:{help numlist}}             1,600          1,600          1,600

   # of unique time-series operators in
       a command                            100            100            100
   # seasonal suboperators per time-series
       operator                               8              8              8

   # of dyadic operators in an expression    66            500            500
   # of numeric literals in an expression    50            150            150
   # of string literals in an expression    256            512            512
   length of string in string expression     80             80            244
   # of sum functions in an expression        5              5              5

   # of characters in a macro             8,681         67,784      1,081,511

   # of nested do-files                      64             64             64

   # of lines in a program                3,500          3,500          3,500
   # of characters in a program         135,600        135,600        135,600

   length of a variable name                 32             32             32
   length of ado-command name                32             32             32
   length of a global macro name             32             32             32
   length of a local macro name              31             31             31

   length of a string variable               80             80            244

   {helpb adjust}
       # of variables in {cmd:by()} option          7              7              7

   {helpb anova}
       # of variables in a single {cmd:anova} term  8              8              8
       # of terms in the {cmd:repeated()} option    4              4              4

   {helpb char}
       length of a single characteristic  8,681         67,784         67,784

   {helpb constraint}
       # of constraints                   1,999          1,999          1,999

   {helpb encode} and {helpb decode}
       # of unique values                  1000         65,536         65,536

   {helpb _estimates} {cmd:hold}
       # of stored estimation results        20             20             20

   {helpb grmeanby}
       # of unique values in {varlist}       _N/2           _N/2           _N/2

   {helpb impute}
       # of variables in {varlist}             31             31             31

   {helpb infile}
       record length without dictionary    none           none           none
       record length with a dictionary   32,765         32,765         32,765

   {helpb infix}
       record length with a dictionary   32,765         32,765         32,765

   {helpb iqreg}
       # of independent variables           336            336            336

   {helpb label}
       length of dataset label               80             80             80
       length of variable label              80             80             80
       length of value label string      32,000         32,000         32,000
       length of name of value label         32             32             32
       # of codings within a single
	   value label                    1,000         65,536         65,536

   {helpb manova}
       # of variables in single {cmd:manova} term   8              8              8

   {helpb matrix}  (2)
       dimension of single matrix       40 x 40      800 x 800  11,000x11,000

   {help maximize} options
       {cmd:iterate()} maximum                 16,000         16,000         16,000

   {helpb mlogit}
       # of outcomes                         20             50             50

   {helpb net} (also see {helpb usersite})
       # of description lines in .pkg file  100            100            100

   {helpb nlogit} and {helpb nlogittree}
       # of levels in model                   8              8              8

   {helpb notes}
       length of a single note            8,681         67,784         67,784
       # of notes attached to _dta        9,999          9,999          9,999
       # of notes attached to each
	   variable                       9,999          9,999          9,999

   {it:{help numlist}}
       # of elements in the numeric list  1,600          1,600          1,600

   {helpb ologit} and {helpb oprobit}
       # of outcomes                         20             50             50

   {helpb reg3}, {helpb sureg}, and other system estimators
       # of equations                        40            800         11,000

   {cmd:set} {helpb adosize}
       memory ado-files may consume        500K           500K           500k

   {cmd:set} {helpb scrollbufsize}
       memory for Results window buffer    500K           500K           500k

   {helpb sqreg}
       # of independent variables
	   (q=#quantiles)                 336/q          336/q          336/q

   {helpb stcox}
       # of variables in {cmd:strata()} option      5              5              5

   {helpb table} and {helpb tabdisp}
       # of by variables                      4              4              4
       # of margins, i.e., sum of rows,
	 columns, supercolumns, and
	 by groups                        3,000          3,000          3,000

   {helpb tabulate}  (3)
       # of rows in one-way table           500          3,000         12,000
       # of rows & cols in two-way table 160x20         300x20       1,200x80

   {cmd:tabulate, summarize} (see {helpb tabsum})
       # of cells (rows X cols)             375            375            375

   {cmd:xt} estimation commands (e.g., {helpb xtgee},
       {helpb xtgls}, {helpb xtpoisson}, {helpb xtprobit}, {helpb xtreg}
       with {cmd:mle} option, and {helpb xtpcse} when
       neither option {cmd:hetonly} nor option
       {cmd:independent} are specified)

       # of time periods within panel        40            800         11,000
{hline}


{title:Notes}

{p 4 8 2}(1)  2,147,483,647 is a theoretical maximum; memory availability will
certainly impose a smaller maximum.

{p 4 8 2}(2)  In Mata, {cmd:matrix} is limited by the amount of memory on your
               computer.

{p 4 8 2}(3)  For Intercooled Stata for the Macintosh, limits are 2,000 for the
number of rows for a one-way table and 180 for number of rows for a two-way
table.


{title:Matrix size}

{p 4 4 2}See {helpb matsize}.


{title:Determining which flavor of Stata you are running}

    Type

	    {cmd:. about}

{p 4 4 2}
The response will be Stata/SE, Intercooled Stata, or Small Stata.
Other information is also shown, including your serial number.
See {helpb about}.


{title:Also see}

{psee}
Online:  {helpb about}, {helpb compress}, {help data types},
{helpb infile}, {helpb matsize}, {helpb memory}, {helpb obs}