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The week's question
In December 2024, in the thread "Re: BRK: Why Not XOM?", BreckHutHigh asked the members: "What about the long road trips with kids?" This week it is put to everyone again. The button below opens the small thread re-asking it - read what others have said so far, then give your own answer as an ordinary reply.
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Investment Strategies / Mechanical Investing
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Author: Rabelais   😊 😞
Number: of 6131 
Subject: Re: BCC Updated to 12/23/2025
Date: 12/27/25 1:15 PM
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Zee said:
What I shared was based on using a 9-Day Weighted Moving Average (WMA). What you've posted is using an Exponential Moving Average (EMA).

Using a different style MA would account for different signals. I went back and calculated the WMA-9 on the StockCharts data (they only provide SMA and EMA, which is probably why the link I got had EMA). The formula I'm using for WMA is (V1*9+V2*8+...V8*2+V9)/45, where V1 is the latest value.

Here's what I see:

Date      NH-NL      SMA-9       WMA-9       EMA-9 
10/31/25 -67
11/3/25 -53
11/4/25 -227
11/5/25 -94
11/6/25 -194
11/7/25 -323
11/10/25 54
11/11/25 40
11/12/25 78 (87.33) (60.84) (25.22)
11/13/25 -172 (99.00) (77.78) (54.58)
11/14/25 -286 (124.89) (115.18) (100.86)
11/17/25 -312 (134.33) (152.60) (143.09)
11/18/25 -333 (160.89) (192.33) (181.07)
11/19/25 -300 (172.67) (220.16) (204.86)
11/20/25 -357 (176.44) (257.02) (235.29)
11/21/25 -347 (221.00) (291.13) (257.63)
11/24/25 -1 (225.56) (247.13) (206.30)
11/25/25 97 (223.44) (182.62) (145.64)
11/26/25 184 (183.89) (101.13) (79.71)
11/28/25 131 (137.56) (38.16) (37.57)
12/1/25 9 (101.89) (8.84) (28.26)
12/2/25 -32 (68.44) 5.13 (29.01)
12/3/25 87 (25.44) 36.22 (5.80)
12/4/25 152 31.11 71.71 25.76
12/5/25 166 88.11 98.69 53.81
12/8/25 100 99.33 101.07 63.04
12/9/25 54 94.56 92.00 61.24
12/10/25 230 99.67 119.09 94.99
12/11/25 265 114.56 152.16 128.99
12/12/25 90 123.56 147.24 121.19
12/15/25 -91 117.00 104.33 78.75
12/16/25 -158 89.78 49.33 31.40
12/17/25 -165 54.56 (1.62) (7.88)
12/18/25 -106 24.33 (33.73) (27.50)
12/19/25 -74 5.00 (53.40) (36.80)
12/22/25 45 4.00 (45.40) (20.44)
12/23/25 -49 (27.00) (56.00) (26.15)
12/24/25 -15 (58.11) (53.60) (23.92)

From this it looks like the WMA also went negative on December 17. Either I'm doing something wrong or the data is bad. Can you help set me straight?

Thanks,

JRB
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