Lære Line Plots for Time Series

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import pandas as pd
import matplotlib.pyplot as plt

# Create a simple time series DataFrame
dates = pd.date_range(start="2023-01-01", periods=12, freq="ME")
values = [100, 110, 120, 130, 140, 150, 160, 155, 150, 145, 140, 135]
df = pd.DataFrame({"Value": values}, index=dates)

# Plot the time series
plt.figure(figsize=(8, 4))
plt.plot(df.index, df["Value"], marker="o", linestyle="-")
plt.xlabel("Date")
plt.ylabel("Value")
plt.title("Monthly Values Over Time")
plt.grid(True)
plt.tight_layout()
plt.show()

Line plots are one of the most common ways to visualize time series data. In the plot above, the x-axis represents time (with dates as labels), and the y-axis shows the values of the variable you are tracking. Each point on the line corresponds to a value at a specific time, and the line connects these points to reveal the overall pattern.

When you interpret a line plot for time series data, look for several key features:

Overall direction or trend: a consistent upward or downward movement over time;
Seasonality: repeating patterns or cycles at regular intervals, such as monthly or yearly fluctuations;
Level: the average value around which the series fluctuates;
Volatility: how much the values vary from one period to the next;
Anomalies or outliers: points that deviate significantly from the general pattern.

By examining these features, you can quickly get a sense of the underlying structure of your time series and identify patterns that may be important for further analysis or forecasting.

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