static string
variance_analysis(const Vectors& v, int class_variable,
int response_variable, int response_type, const string& filename,
int iformat)
{
StatError error;
std::stringstream s;
bool ret;
output_format format = output_format(iformat);
ret = v.variance_analysis(error, s, class_variable, response_variable,
response_type, filename.c_str(), format);
if (!ret)
stat_tool::wrap_util::throw_error(error);
return s.str();
}
