Graham Holdings Co (GHC)
Graham Holdings Company is a diversified global media and education company. The company is headquartered in Arlington, Virginia.
Stock Price Trends
Stock price trends estimated using linear regression.
Key facts
- The primary trend is increasing.
- The growth rate of the primary trend is 34.57% per annum.
- GHC price at the close of April 28, 2025 was $922.77 and was inside the primary price channel.
- The secondary trend is increasing.
- The growth rate of the secondary trend is 4.44% per annum.
- GHC price at the close of April 28, 2025 was inside the secondary price channel.
Linear Regression Model
Model equation:
Yi = α + β × Xi + εi
Top border of price channel:
Exp(Yi) = Exp(a + b × Xi + 2 × s)
Bottom border of price channel:
Exp(Yi) = Exp(a + b × Xi – 2 × s)
where:
i - observation number
Yi - natural logarithm of GHC price
Xi - time index, 1 day interval
σ - standard deviation of εi
a - estimator of α
b - estimator of β
s - estimator of σ
Exp() - calculates the exponent of e
Primary Trend
Start date: April 25, 2023
End date: April 28, 2025
a = 5.3900
b = 0.0008
s = 0.0484
Annual growth rate:
Exp(365 × b) – 1
= Exp(365 × 0.0008) – 1
= 34.57%
Price channel spread:
Exp(4 × s) – 1
= Exp(4 × 0.0484) – 1
= 21.34%
April 25, 2023 calculations
Top border of price channel:
Exp(Y752)
= Exp(a + b × X752 + 2 × s)
= Exp(a + b × 1,091 + 2 × s)
= Exp(5.3900 + 0.0008 × 1,091 + 2 × 0.0484)
= Exp(6.3742)
= $586.53
Bottom border of price channel:
Exp(Y752)
= Exp(a + b × X752 – 2 × s)
= Exp(a + b × 1,091 – 2 × s)
= Exp(5.3900 + 0.0008 × 1,091 – 2 × 0.0484)
= Exp(6.1808)
= $483.37
April 28, 2025 calculations
Top border of price channel:
Exp(Y1,255)
= Exp(a + b × X1,255 + 2 × s)
= Exp(a + b × 1,825 + 2 × s)
= Exp(5.3900 + 0.0008 × 1,825 + 2 × 0.0484)
= Exp(6.9713)
= $1,065.63
Bottom border of price channel:
Exp(Y1,255)
= Exp(a + b × X1,255 – 2 × s)
= Exp(a + b × 1,825 – 2 × s)
= Exp(5.3900 + 0.0008 × 1,825 – 2 × 0.0484)
= Exp(6.7779)
= $878.20
Description
- The primary trend is increasing.
- The growth rate of the primary trend is 34.57% per annum.
- GHC price at the close of April 28, 2025 was $922.77 and was inside the primary price channel.
Secondary Trend
Start date: November 6, 2024
End date: April 28, 2025
a = 6.6206
b = 0.0001
s = 0.0339
Annual growth rate:
Exp(365 × b) – 1
= Exp(365 × 0.0001) – 1
= 4.44%
Price channel spread:
Exp(4 × s) – 1
= Exp(4 × 0.0339) – 1
= 14.54%
November 6, 2024 calculations
Top border of price channel:
Exp(Y1,139)
= Exp(a + b × X1,139 + 2 × s)
= Exp(a + b × 1,652 + 2 × s)
= Exp(6.6206 + 0.0001 × 1,652 + 2 × 0.0339)
= Exp(6.8850)
= $977.45
Bottom border of price channel:
Exp(Y1,139)
= Exp(a + b × X1,139 – 2 × s)
= Exp(a + b × 1,652 – 2 × s)
= Exp(6.6206 + 0.0001 × 1,652 – 2 × 0.0339)
= Exp(6.7492)
= $853.39
April 28, 2025 calculations
Top border of price channel:
Exp(Y1,255)
= Exp(a + b × X1,255 + 2 × s)
= Exp(a + b × 1,825 + 2 × s)
= Exp(6.6206 + 0.0001 × 1,825 + 2 × 0.0339)
= Exp(6.9055)
= $997.78
Bottom border of price channel:
Exp(Y1,255)
= Exp(a + b × X1,255 – 2 × s)
= Exp(a + b × 1,825 – 2 × s)
= Exp(6.6206 + 0.0001 × 1,825 – 2 × 0.0339)
= Exp(6.7698)
= $871.14
Description
- The secondary trend is increasing.
- The growth rate of the secondary trend is 4.44% per annum.
- GHC price at the close of April 28, 2025 was inside the secondary price channel.