jquery radio button not refreshing -

jquery radio button not refreshing -

this quick question i'm sure i'm sure i'm having brain fart here.

goal. on load select 1 of 2 radio buttons.

problem. visually not show.

i've tried sepreatly , @ same time 2 lines of code.

$("#ssexfemale").attr("checked", true);

$("#ssexfemale").prop("checked", true);

the first line changes

<input type="radio" name="ssex" id="ssexfemale" value="0">

into

<input type="radio" name="ssex" id="ssexfemale" value="0" checked="checked">

but radio button still not checked visually. if manually changed file html starts sec line see radio button selected. did research , found saying use.

$('#ssexfemale').buttonset("refresh");

but generates next error.

uncaught error: cannot phone call methods on buttonset prior initialization; attempted phone call method 'refresh'

this must simple i'm missing. help appreciated. thanks.

jquery radio-button