Iebaltab problem

[Simeon Lauterbach]

Dear all,

I have a simple problem. I am running the following code: iebaltab aggregate_sd , grpvar(treatment) browse
Treatment is a dummy (0/1) and aggregate_sd are standardized testscores. I want to check if my treatment and control group are balanced.

However, I always get this error: type mismatch
r(109); Return code 109
type mismatch
In an expression, you attempted to combine a string and numeric
subexpression in a logically impossible way. For instance, you
attempted to subtract a string from a number or you attempted
to take the substring of a number.


Now, I checked everything: aggregate sd is numerical, treatment as well. So this error makes no sense to me. Has anyone an idea? Also, I changed float to double, double to float, everything...

Here are parts of my dataset:
---------------------- copy starting from the next line -----------------------

* Example generated by -dataex-. For more info, type help dataex
clear
input double aggregate_sd float treatment
-1.1429336071014404 0
 -.6859450936317444 0
 -.5503984689712524 0
  1.758466124534607 0
  .4320257008075714 0
end

[Rich Goldstein]

after I change the value of treatment to 1 in a couple of observations (I chose the last 2), it worked fine for me; please post an example where the problem occurs

[Simeon Lauterbach]

You mean like the output I get in stata?

[Eurelia Kazekula]

Dear all,

I have a simple problem. I am running the following code: iebaltab aggregate_sd , grpvar(treatment) browse
Treatment is a dummy (0/1) and aggregate_sd are standardized testscores. I want to check if my treatment and control group are balanced.

However, I always get this error: type mismatch
r(109); Return code 109
type mismatch
In an expression, you attempted to combine a string and numeric
subexpression in a logically impossible way. For instance, you
attempted to subtract a string from a number or you attempted
to take the substring of a number.


Now, I checked everything: aggregate sd is numerical, treatment as well. So this error makes no sense to me. Has anyone an idea? Also, I changed float to double, double to float, everything...

Here are parts of my dataset:
---------------------- copy starting from the next line -----------------------

* Example generated by -dataex-. For more info, type help dataex
clear
input double aggregate_sd float treatment
-1.1429336071014404 0
-.6859450936317444 0
-.5503984689712524 0
1.758466124534607 0
.4320257008075714 0
end

I am facing the same problem, how did you solve this?

[Hemanshu Kumar]

Please provide a data example using dataex, and the exact command you are running, along with the error produced. Please make sure the error occurs even on the data example you provide, so that it is reproducible for the rest of us.