doubt regarding standard deviation using egen function

[Sanesh Kp]

I have tried to find row wise sd for a set of variables from i_a_0 to i_c_1
syntax: egen rowsd2 = rowsd(i_a_0 - i_c_1 )

output show error like this

.unknown egen function rowsd()

help me to solve this [roblem

[Sanesh Kp]

can anyone share some useful stata reference materials for beginner. i am following command based operations.

[Maarten Buis]

That command should work at least for Stata 14 and higher (I don't have older versions on this computer)

[Nick Cox]

I think rowsd() has been around for several versions. What version of Stata do you think you're using? If It's a pirated version, i.e. not one downloaded from StataCorp or an official Stata distributor, then problems with egen are a known phenomenon.

[Sanesh Kp]

foreach i in 3 4 {
foreach var in i_b_9 i_b_10 i_b_8 i_b_11 i_b_6 {
gen `var'b_all_`i' = 0
replace `var'b_all_`i' = `var'b if `var'_dum_`i' == 1
replace `var'b_all_`i' = . if `var'_dum_`i' == .
replace `var'b_all_`i' = 0 if `var'b_all_`i' ==. & `var'_dum_`i' !=.
gen `var'b_`i' = `var'b_all_`i'
replace `var'b_`i' = . if `var'_dum_`i' == 0
* replace `var'b_`i' = 0 if `var'b_`i' ==. & `var'_dum_`i' !=.
}
}

pls help me to read and understand this command

[Nick Cox]

There seems to be a disconnect here.

Please answer the question in #4. Whatever the code in #5 is doing, it's not calculating a standard deviation.

Where does the code in #5 come from? It seems that you are starting with variables

i_b_9 i_b_10 i_b_8 i_b_11 i_b_6

and also those with suffixes

_dum_1 _dum_2 _​​​​​​​dum_3

Please give a data example with enough of those variables and explain what it is that you want to do.