display as txt "La somme est de S = " as res 1+6
display as res 7-5
display 2*7
display 17/3
display int(17/3)
display mod(17,3)
display 2^3
display exp(1)
display sin(_pi/2)
display comb(10,2)
mata: factorial(3)

version
dir
ls *.png
findfile stata.png
copy stata.png stata_new.png
ls stata*
rm stata_new.png // erase
sysdir list
sysdir
pwd
cd "C:\Users\ibtall\Documents\PERSONNAL\COURS"
mkdir mondoc
rmdir mondoc
cd ..
cd ./COURS
which display
help display
search xtable

ssc new
ssc whatshot, n(3)
ssc hot, n(3)
ssc describe w
ssc describe ereplace
ssc install ereplace
ssc install elabel
ssc install dummies
ssc uninstall dummies

net
net query
net from C:\Users\ibtall\Documents
net cd C:\Users\ibtall\Documents\PERSONNAL
net link sj
net describe dummies, from(C:\Users\ibtall\ado\plus)
net set ado C:\Users\ibtall\ado\plus
net set other C:\Users\ibtall\Documents
net search dups, from(C:\Users\ibtall\Documents)
net get dups, from(C:\Users\ibtall\Documents)
net install schemepack, replace

ado, find("label") from(C:\Users\ibtall\ado\plus)
ado dir, find("la") from(C:\Users\ibtall\ado\plus)
ado describe, find("label") from(C:\Users\ibtall\ado\plus)
ado uninstall dups, from(C:\Users\ibtall\ado\plus\d)

webuse systolic, clear
sysuse auto, clear
sysuse dir
import excel MaBase.xlsx, sheet("STORMS") cellrange(B2:O19538) firstrow clear
save mabase, replace
export excel MaBase.xlsx, sheet("STORMS BIS") cellrange(B2:O19538) firstrow(varlabel) replace
isid make
merge 1:1 make using mabase.dta, generate(related) keepusing(foreign rep78 length) keep(matched)
append using mabase.dta, generate(linked)

notes: Les voitures américaines 
notes make: La marque et la serie de la voiture
notes
notes replace _dta in 2: Les voitures d'occasion
notes _dta
notes search voiture
notes drop _dta in 2
notes list

rename price cout
rename * v#, addnumber
rename * v#, addnumber(20)
rename v# v#, renumber(0) sort
rename (v1 v2 v3)(Marque cout kilometrage)
rename v?, upper
rename *, lower
rename v* (make price mpg rep78 headroom trunk weight length turn displacement gear_ratio foreign)

sort make
gsort foreign -price 
order turn foreign, after(make)
order foreign, last

assert inrange(price,0, 100000)
list price mpg rep78 headroom trunk weight length in 1/7
edit
browse

describe
codebook price foreign
count if price <= 5000
by foreign, sort: count if price <= 5000
inspect price
summarize weight
summarize weight, detail
bysort foreign: summarize price
statsby, by(foreign) saving(myfile, replace): summarize price weight 
use mabase, clear
collapse (count) Nb = make (mean) Prix = price (median) Poids_median = weight, by(rep78 foreign)
mean price weight, over(foreign)
total price weight, over(foreign)
proportion repeted, over(foreign)
ratio ppoids: price/weight, over(foreign)

tab1 foreign rep78
tab2 rep78 foreign
tabulate foreign, summarize(price)
tabulate rep78 foreign, row nofreq
tabulate rep78 foreign, summarize(price) means
tabstat price weight mpg, by(foreign) statistics(mean)

table (rep78)(foreign), statistic(mean price) statistic(median weight)
table ()(var), statistic(mean price weight) statistic(fvfrequency foreign) ///
 command(regress price length i.rep78) name(mytab)
collect export mytables.xlsx, name(mytab) as(xlsx) sheet(table) cell(B2) modify
dtable, by(rep78) continuous(price length, statistics(mean) test(kwallis)) ///
 factor(foreign, statistics(fvpercent) test(kendall)) nformat(%12.0f) ///
 name(mydtab) export("mytables.xlsx", as(xlsx) sheet(mafeuil) cell(A2) modify)
regress price weight mpg length i.rep78
estimates store mymod
etable, estimates(mymod) export(mytables.xlsx, sheet(etable) modify) name(myreg)
collect dir
collect clear

generate cout = rep78 * 12500
generate loi1 = runiform()
generate loi2 = runiform()
compare loi1 loi2
set seed 123456
generate loi1u = runiform()
set seed 123456
generate loi2u = runiform()
compare loi2u loi1u
generate marque = word(make, 1)
bysort rep78 foreign: egen vprice = mean(price)
replace loi = rnormal()
bysort rep78 foreign: ereplace vprice = total(price)
generate cpoids = cond(mpg <= 20, 1, 2)
egen prix_cl = cut(price), at(3291, 5000, 10000, 15906) icodes
egen mpg_cl = cut(mpg), group(3)
generate weight_cl = autocode(weight, 4, 1760, 4840)
recode weight_cl (2530 = 1 "Légère")(3300 = 2 "Moins lourde")(4070 = 3 "Lourde")(else = 4 "Très lourde"), generate(new_weight)
label variable cout "Le coût de réparation"
elabel variable (loi marque)("Loi Uniforme" "La marque de la voiture")
label define prix_cod 0 "Moins cher" 1 Abordable 2 Cher 3 "Très Cher"
label values prix_cl prix_cod
label define fcode 1 Domesti 2 Foreign
encode foreigntxt, generate(foreigncod) label(fcode)
decode foreign, generate(foreigntxt) maxlength(7)
tostring gear_ratio, generate(geartxt) force
destring geartxt, generate(gearnum) ignore("." "/") force
drop cout loi
keep make price mpg marque prix_cl foreign rep78
keep if !missing(price)
drop in 1/22

forvalues i = 5 10 to 25 {
    display `i'
}
foreach v in moy var {
    display strlen("`v'") 
}
levelsof foreign, local(lniv)
foreach z of local lniv {
    di "-> factor = `:label (foreign) `z''"
    count if foreign == `z'
}
local i = 0
while `i' <= 5 {
    display `i'
    local ++i
}

set scheme gg_tableau
graph bar (percent), over(rep78) blabel(bar, format(%9.2f) color(red))
graph hbar (percent), over(rep78) blabel(bar, format(%9.2f)) scheme(swift_red)
graph bar (percent), over(rep78) over(foreign) asyvars percentages blabel(bar, position(center) format(%9.1f))
graph bar (percent), over(rep78) over(foreign) asyvars percentages stack ///
 blabel(bar, position(center) format(%9.1f)) scheme(black_tableau)
graph box price, over(foreign) 
graph pie, over(rep78) pie(_all, explode(10)) plabel(_all percent, color(blue) format(%4.1f))