trying to create a formula that will track 180 day trailing standard deviation.  can you walf me through how to create the formula and add it to a column in a watchlist...

thanks

The Modelling Bollinger Bands (& Standard Deviation) in a TC PCF topic explores the creation of Standard Deviation based Personal Criteria Formulas. You can add the Indicator Formula by selecting Library | Indicators | Write Indicator Formula.

SQR(ABS(C ^ 2 + C1 ^ 2 + C2 ^ 2 + C3 ^ 2 + C4 ^ 2 + C5 ^ 2 + C6 ^ 2 + C7 ^ 2 + C8 ^ 2 + C9 ^ 2 + C10 ^ 2 + C11 ^ 2 + C12 ^ 2 + C13 ^ 2 + C14 ^ 2 + C15 ^ 2 + C16 ^ 2 + C17 ^ 2 + C18 ^ 2 + C19 ^ 2 + C20 ^ 2 + C21 ^ 2 + C22 ^ 2 + C23 ^ 2 + C24 ^ 2 + C25 ^ 2 + C26 ^ 2 + C27 ^ 2 + C28 ^ 2 + C29 ^ 2 + C30 ^ 2 + C31 ^ 2 + C32 ^ 2 + C33 ^ 2 + C34 ^ 2 + C35 ^ 2 + C36 ^ 2 + C37 ^ 2 + C38 ^ 2 + C39 ^ 2 + C40 ^ 2 + C41 ^ 2 + C42 ^ 2 + C43 ^ 2 + C44 ^ 2 + C45 ^ 2 + C46 ^ 2 + C47 ^ 2 + C48 ^ 2 + C49 ^ 2 + C50 ^ 2 + C51 ^ 2 + C52 ^ 2 + C53 ^ 2 + C54 ^ 2 + C55 ^ 2 + C56 ^ 2 + C57 ^ 2 + C58 ^ 2 + C59 ^ 2 + C60 ^ 2 + C61 ^ 2 + C62 ^ 2 + C63 ^ 2 + C64 ^ 2 + C65 ^ 2 + C66 ^ 2 + C67 ^ 2 + C68 ^ 2 + C69 ^ 2 + C70 ^ 2 + C71 ^ 2 + C72 ^ 2 + C73 ^ 2 + C74 ^ 2 + C75 ^ 2 + C76 ^ 2 + C77 ^ 2 + C78 ^ 2 + C79 ^ 2 + C80 ^ 2 + C81 ^ 2 + C82 ^ 2 + C83 ^ 2 + C84 ^ 2 + C85 ^ 2 + C86 ^ 2 + C87 ^ 2 + C88 ^ 2 + C89 ^ 2 + C90 ^ 2 + C91 ^ 2 + C92 ^ 2 + C93 ^ 2 + C94 ^ 2 + C95 ^ 2 + C96 ^ 2 + C97 ^ 2 + C98 ^ 2 + C99 ^ 2 + C100 ^ 2 + C101 ^ 2 + C102 ^ 2 + C103 ^ 2 + C104 ^ 2 + C105 ^ 2 + C106 ^ 2 + C107 ^ 2 + C108 ^ 2 + C109 ^ 2 + C110 ^ 2 + C111 ^ 2 + C112 ^ 2 + C113 ^ 2 + C114 ^ 2 + C115 ^ 2 + C116 ^ 2 + C117 ^ 2 + C118 ^ 2 + C119 ^ 2 + C120 ^ 2 + C121 ^ 2 + C122 ^ 2 + C123 ^ 2 + C124 ^ 2 + C125 ^ 2 + C126 ^ 2 + C127 ^ 2 + C128 ^ 2 + C129 ^ 2 + C130 ^ 2 + C131 ^ 2 + C132 ^ 2 + C133 ^ 2 + C134 ^ 2 + C135 ^ 2 + C136 ^ 2 + C137 ^ 2 + C138 ^ 2 + C139 ^ 2 + C140 ^ 2 + C141 ^ 2 + C142 ^ 2 + C143 ^ 2 + C144 ^ 2 + C145 ^ 2 + C146 ^ 2 + C147 ^ 2 + C148 ^ 2 + C149 ^ 2 + C150 ^ 2 + C151 ^ 2 + C152 ^ 2 + C153 ^ 2 + C154 ^ 2 + C155 ^ 2 + C156 ^ 2 + C157 ^ 2 + C158 ^ 2 + C159 ^ 2 + C160 ^ 2 + C161 ^ 2 + C162 ^ 2 + C163 ^ 2 + C164 ^ 2 + C165 ^ 2 + C166 ^ 2 + C167 ^ 2 + C168 ^ 2 + C169 ^ 2 + C170 ^ 2 + C171 ^ 2 + C172 ^ 2 + C173 ^ 2 + C174 ^ 2 + C175 ^ 2 + C176 ^ 2 + C177 ^ 2 + C178 ^ 2 + C179 ^ 2 - 180 * AVGC180 ^ 2) / 180)

Once you have created and saved your Indicator Formula, you can select Add Column in the WatchList and choose the Indicator Formula from the list to use it as a WatchList Column.

Adding & Editing WatchList Columns

ok  I cut and pasted into the new indicator and created a column etc..   S&P shows the trailing 180 st dev as 88.78.  sounded really high to me???? 

It may have "sounded really high" to you, but it is correct nevertheless.

Try adding adding 180-Period Bollinger Bands to the chart with the Std Dev setting set to 0.50. Subtracting the value of the lower band from the upper band will give you the 180-period standard deviation.